(ui) Remove legacy-facing labels from operator pages

Replace refactor-era wording such as Source, Source root, SQL records,
database, runtime, and Django generation labels with operator-facing copy
around backup source, tracking records, changelog files, active config, and
pobsync-managed SSH keys.

Add view assertions so the old source/SQL labels do not quietly return.

Refs #24

.dockerignore

@@ -0,0 +1,11 @@
+.git
+.venv
+__pycache__/
+*.pyc
+*.pyo
+.pytest_cache/
+.mypy_cache/
+var/
+dist/
+build/
+*.egg-info/

.env.example

@@ -0,0 +1,7 @@
+POBSYNC_BACKUP_ROOT=/mnt/backups/pobsync
+POBSYNC_DJANGO_ALLOWED_HOSTS=localhost,127.0.0.1,backup.example.com
+POBSYNC_DJANGO_SECRET_KEY=change-me-to-a-long-random-secret
+POBSYNC_DJANGO_DEBUG=0
+POBSYNC_WEB_BIND=127.0.0.1
+POBSYNC_GUNICORN_WORKERS=2
+POBSYNC_GUNICORN_TIMEOUT=120

.gitignore

@@ -1,3 +1,11 @@
-__pycache__
+__pycache__/
-*egg-info
+*.py[cod]
+.venv/
+var/
+backups/
+.pytest_cache/
+.mypy_cache/
+*.egg-info/
 build/
+dist/
+.env

CHANGELOG.md

@@ -0,0 +1,37 @@
+# Changelog
+
+## 1.0.0 - 2026-05-21
+
+Initial stable release of the Django-first pobsync control panel.
+
+### Added
+
+- Django control panel for hosts, global settings, schedules, SSH credentials, snapshots, runs, self-checks, and logs.
+- Native systemd installer and updater for production backup servers.
+- SQLite by default, with optional MariaDB support.
+- Scheduler and worker services for queued manual backups and scheduled backups.
+- Manual backup, dry-run, cancellation, verbose rsync logging, and run detail views.
+- Snapshot discovery for existing backup directories and SQL-backed snapshot records.
+- SQL retention planning and apply flow with base snapshot protection and incomplete snapshot visibility.
+- Explicit cleanup flow for incomplete snapshots, separate from normal retention pruning.
+- Purged snapshot audit overview with reason, action source, operator, host, kind, path, and timestamp.
+- Dashboard and host pages with backup health, latest run/snapshot, next run, and storage/stat summaries.
+- Review resolution for failed/warning runs and incomplete snapshot tasks so operational warnings can be acknowledged.
+- Worker heartbeat metadata and stale running-run reconciliation for queued backup workers.
+- SSH key generation, upload, edit, guarded delete, known_hosts management, and per-host key selection.
+- In-app changelog page sourced from this changelog.
+- Restore guidance on snapshot detail pages.
+
+### Changed
+
+- Django and the database are now the source of truth for configuration.
+- Docker Compose is documented as development and disposable test tooling rather than the primary production path.
+- The `pobsync` console entrypoint is now a maintainer layer around Django management commands.
+- Scheduled pruning is evaluated by the pobsync scheduler service and recorded through Django, not host cron.
+- Retention and incomplete cleanup now preserve audit history even after source snapshot records are removed.
+
+### Removed
+
+- Legacy YAML config import/export workflow.
+- Public short aliases for configuration commands.
+- Obsolete global config storage fields.

Dockerfile

@@ -0,0 +1,27 @@
+FROM python:3.12-slim
+
+ENV PYTHONDONTWRITEBYTECODE=1 \
+    PYTHONUNBUFFERED=1 \
+    PIP_NO_CACHE_DIR=1
+
+RUN apt-get update \
+    && apt-get install -y --no-install-recommends rsync openssh-client cron default-libmysqlclient-dev build-essential pkg-config \
+    && rm -rf /var/lib/apt/lists/*
+
+WORKDIR /app
+
+COPY pyproject.toml README.md CHANGELOG.md ./
+COPY src ./src
+COPY manage.py ./
+COPY scripts/docker-entrypoint ./scripts/docker-entrypoint
+
+RUN python -m pip install --upgrade pip \
+    && python -m pip install -e ".[mariadb]"
+
+RUN mkdir -p /opt/pobsync/config/hosts /opt/pobsync/state/locks /opt/pobsync/logs /var/lib/pobsync
+RUN chmod +x ./scripts/docker-entrypoint
+
+EXPOSE 8000
+
+ENTRYPOINT ["./scripts/docker-entrypoint"]
+CMD ["gunicorn", "pobsync_server.wsgi:application", "--bind", "0.0.0.0:8000", "--workers", "2", "--timeout", "120"]

README.md

@@ -1,41 +1,272 @@
 # pobsync
 
-`pobsync` is a pull-based backup tool for sysadmins.  
+`pobsync` is a pull-based backup service. It runs on a central backup server and pulls data from remote machines via
-It creates rsync-based snapshots with hardlinking (`--link-dest`) and stores them centrally on a backup server.
+rsync over SSH.
 
-Backups are **pulled over SSH**, not pushed, and are designed to be run from cron or manually.
+The current refactor is Django-first and SQL-backed:
 
----
+- The Django control panel is the primary interface for setup and operations.
+- The database is the source of truth for hosts, schedules, runs, snapshots, credentials, and retention settings.
+- SQLite is the default database; MariaDB is optional.
+- Backups use the existing rsync snapshot engine internally.
+- Scheduling is handled by a Django scheduler service, not host cron.
+- SSH keys can be managed from Django and selected globally or per host.
 
-## Design overview
+## Recommended Production Install
 
-- Runtime, config, logs and state live under **`/opt/pobsync`**
+The recommended production deployment is native systemd services on the backup server. Docker Compose remains available
-- Backup data itself is stored under a configurable **`backup_root`** (e.g. `/srv/backups`)
+for development and disposable test installs, but native systemd avoids Docker friction around SSH, filesystem mounts,
-- Two snapshot types:
+large backup storage, and host-level service logs.
-  - **scheduled**  
-    Participates in retention pruning (daily / weekly / monthly / yearly)
-  - **manual**  
-    Kept outside the scheduled prune chain, defaults to hardlinking from the latest scheduled snapshot
-- Minimal dependencies (currently only `PyYAML`)
 
----
+Recommended layout:
 
-## Requirements
+```
+/opt/pobsync/app          # installed app checkout
+/opt/pobsync/venv         # Python virtualenv
+/etc/pobsync/pobsync.env  # settings and secrets
+/var/lib/pobsync          # SQLite database, state, runtime SSH key files, static files
+/backups                  # backup storage, or set another absolute path
+```
 
-- Python **3.11+**
+From a checked-out copy of this repository, run:
-- `rsync`
-- `ssh`
-- Root or sudo access on the backup server
-- SSH keys already configured between backup server and remotes
 
----
+```
+sudo scripts/install-systemd
+```
 
-## Installation (system-wide, no venv)
+When run from a terminal, the installer asks for the important paths and settings with sensible defaults already filled
+in. It can also create the first Django superuser and prints the next steps when installation is complete.
 
-This assumes you are installing as root or via sudo.
+The installer will, by default:
 
-From the repository root:
+- install required Debian/Ubuntu OS packages with `apt-get`
+- copy the checkout to `/opt/pobsync/app`
+- create `/opt/pobsync/venv`
+- write `/etc/pobsync/pobsync.env` if it does not exist
+- install `pobsync-manage`, a Django management wrapper that loads `/etc/pobsync/pobsync.env`
+- create `/var/lib/pobsync`, `/var/log/pobsync`, and the backup root
+- install Python dependencies
+- run migrations and collect static files
+- generate a default SSH key for the service user if one does not exist yet
+- install and start `pobsync-web`, `pobsync-worker`, and `pobsync-scheduler`
+- guide you through the first login and setup steps
 
-```bash
+Common overrides:
-python3 -m pip install --upgrade pip
+
-sudo python3 -m pip install .
+```
+sudo scripts/install-systemd \
+  --backup-root /mnt/backups/pobsync \
+  --time-zone Europe/Amsterdam \
+  --allowed-hosts backup.example.com,localhost,127.0.0.1 \
+  --csrf-trusted-origins https://backup.example.com
+```
+
+Use `--no-install-os-packages` if you want to manage system packages yourself. Use `--force-env` only when you want the
+installer to rewrite an existing `/etc/pobsync/pobsync.env`.
+Use `--non-interactive` for scripted installs. Use `--verbose` when you want to see the underlying apt, pip, Django, and
+systemd output.
+
+Schedules are evaluated in `POBSYNC_TIME_ZONE`. The installer defaults this to the server timezone when it can detect
+one, otherwise `UTC`; override it with `--time-zone Europe/Amsterdam` or by editing `/etc/pobsync/pobsync.env`.
+
+For MariaDB support, add:
+
+```
+sudo scripts/install-systemd --install-extras mariadb
+```
+
+## Services
+
+The installer creates:
+
+- `pobsync-web.service`: Gunicorn Django control panel on `127.0.0.1:8010`
+- `pobsync-worker.service`: queued backup worker
+- `pobsync-scheduler.service`: SQL-backed schedule dispatcher
+
+Check service state and logs:
+
+```
+systemctl status pobsync-web pobsync-worker pobsync-scheduler
+journalctl -u pobsync-worker -f
+```
+
+Restart after configuration changes:
+
+```
+sudo systemctl restart pobsync-web pobsync-worker pobsync-scheduler
+```
+
+## Reverse Proxy
+
+Use an existing reverse proxy by forwarding to:
+
+```
+http://127.0.0.1:8010
+```
+
+To install a starter nginx site file:
+
+```
+sudo scripts/install-systemd --with-nginx --server-name backup.example.com
+```
+
+For HTTPS behind a reverse proxy, set:
+
+```
+POBSYNC_DJANGO_ALLOWED_HOSTS=backup.example.com,localhost,127.0.0.1
+POBSYNC_DJANGO_CSRF_TRUSTED_ORIGINS=https://backup.example.com
+```
+
+## Django UI
+
+After install, open the control panel through your reverse proxy or directly at:
+
+```
+http://127.0.0.1:8010/
+```
+
+Create a superuser if needed:
+
+```
+sudo -u pobsync pobsync-manage createsuperuser
+```
+
+For other Django management commands on native installs, use `pobsync-manage` so the production environment file is
+loaded before Django starts:
+
+```
+sudo -u pobsync pobsync-manage showmigrations pobsync_backend
+sudo -u pobsync pobsync-manage check
+sudo -u pobsync pobsync-manage check_pobsync_install
+```
+
+The UI includes:
+
+- dashboard and host detail pages
+- global and per-host config forms
+- schedule editing
+- manual backup queueing
+- snapshot discovery
+- host checks for backup directories and SSH readiness
+- host directory preparation for new or existing hosts
+- SQL retention planning and apply flow
+- Django-managed SSH keys
+- `/self-check/` for runtime checks
+- `/logs/` for filtered pobsync service logs
+
+## Restoring Data
+
+pobsync 1.0 treats restores as an explicit manual operation. The control panel shows restore guidance on each snapshot
+detail page, but it does not run restore commands for you yet. That is deliberate: restores should be inspected and
+tested before data is copied back into a live system.
+
+Each snapshot directory contains:
+
+```
+<snapshot>/data/  # backed-up filesystem contents
+<snapshot>/meta/  # metadata and rsync logs
+```
+
+Use the `data/` directory as the rsync source. Start with a dry run and restore to a staging path first:
+
+```
+rsync -aHAX --numeric-ids --info=progress2 --dry-run /backups/example.org/scheduled/<snapshot>/data/ /restore/example.org/
+rsync -aHAX --numeric-ids --info=progress2 /backups/example.org/scheduled/<snapshot>/data/ /restore/example.org/
+```
+
+After validating the staged files, copy the specific files or directories back to the target machine. For a full-host
+restore, use another dry run before writing to the remote root:
+
+```
+rsync -aHAX --numeric-ids --info=progress2 --dry-run /backups/example.org/scheduled/<snapshot>/data/ root@example.org:/
+```
+
+For most incidents, prefer a targeted restore instead of copying the whole snapshot. Keep paths relative to the
+snapshot's `data/` directory:
+
+```
+rsync -aHAX --numeric-ids --info=progress2 --dry-run /backups/example.org/scheduled/<snapshot>/data/etc/nginx/ /restore/example.org/etc/nginx/
+rsync -aHAX --numeric-ids --info=progress2 --dry-run /backups/example.org/scheduled/<snapshot>/data/home/example/site/public_html/index.php /restore/example.org/home/example/site/public_html/index.php
+```
+
+Snapshots may use hardlinks for files that are unchanged between backups. That saves disk space and is safe for normal
+restore copies, but do not edit files inside snapshot directories. Treat snapshots as read-only and copy data out with
+rsync.
+
+## SSH Keys
+
+SSH keys can be managed from `/ssh-credentials/`. The recommended flow is to generate keys from Django or during the
+installer. pobsync stores the private key on disk under the runtime state root (`POBSYNC_HOME`), keeps the public key
+visible in the UI, and lets you select a credential either as the global default or as a per-host override.
+
+Generated private keys are stored at:
+
+```
+$POBSYNC_HOME/state/ssh-credentials/<id>/identity
+```
+
+The key file is written with `0600` permissions and injected into the rsync SSH command with `IdentityFile`. Copy the
+public key shown in Django to the target host's `authorized_keys`.
+
+Existing private keys can still be added manually, but generated filesystem keys are preferred for native systemd
+production installs.
+
+## Updates
+
+From a fresh checkout or the existing app directory:
+
+```
+git pull
+sudo scripts/update-systemd
+```
+
+The updater is a thin wrapper around the installer for normal production deploys. It preserves the existing
+`/etc/pobsync/pobsync.env`, skips OS package installation, skips superuser creation, refreshes the installed app, updates
+Python dependencies, runs migrations, collects static files, and restarts the systemd services so new Django code is
+loaded.
+
+Use the full installer again when you intentionally want to change install-time settings, install OS packages, enable
+nginx, or rewrite the environment file:
+
+```
+sudo scripts/install-systemd --non-interactive
+sudo scripts/install-systemd --force-env
+```
+
+Then check:
+
+```
+systemctl status pobsync-web pobsync-worker pobsync-scheduler
+sudo -u pobsync pobsync-manage check
+sudo -u pobsync pobsync-manage check_pobsync_install
+```
+
+Restart services manually after environment or reverse proxy changes:
+
+```
+sudo systemctl restart pobsync-web pobsync-worker pobsync-scheduler
+```
+
+Inspect service logs with:
+
+```
+journalctl -u pobsync-web -n 100 --no-pager
+journalctl -u pobsync-worker -f
+journalctl -u pobsync-scheduler -n 100 --no-pager
+```
+
+Rollback to a previous revision by checking out the known-good commit or tag, then running the updater again:
+
+```
+git switch master
+git pull
+git checkout <known-good-commit-or-tag>
+sudo scripts/update-systemd
+sudo -u pobsync pobsync-manage check_pobsync_install
+```
+
+## Development
+
+Development, Docker, maintainer tooling, and architecture notes live in:
+
+- [docs/development.md](docs/development.md)

deploy/bin/pobsync-manage

@@ -0,0 +1,24 @@
+#!/bin/sh
+set -eu
+
+APP_DIR="@POBSYNC_APP_DIR@"
+VENV_DIR="@POBSYNC_VENV_DIR@"
+ENV_FILE="@POBSYNC_ENV_FILE@"
+SERVICE_USER="@POBSYNC_USER@"
+SERVICE_GROUP="@POBSYNC_GROUP@"
+
+if [ ! -f "$ENV_FILE" ]; then
+    echo "pobsync environment file not found: $ENV_FILE" >&2
+    exit 1
+fi
+
+set -a
+# shellcheck disable=SC1090
+. "$ENV_FILE"
+set +a
+export POBSYNC_ENV_FILE="$ENV_FILE"
+export POBSYNC_SERVICE_USER="$SERVICE_USER"
+export POBSYNC_SERVICE_GROUP="$SERVICE_GROUP"
+
+cd "$APP_DIR"
+exec "$VENV_DIR/bin/python" "$APP_DIR/manage.py" "$@"

deploy/nginx/pobsync.conf

@@ -0,0 +1,15 @@
+server {
+    listen 80;
+    server_name @POBSYNC_SERVER_NAME@;
+
+    client_max_body_size 16m;
+
+    location / {
+        proxy_pass http://127.0.0.1:8010;
+        proxy_http_version 1.1;
+        proxy_set_header Host $host;
+        proxy_set_header X-Real-IP $remote_addr;
+        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+        proxy_set_header X-Forwarded-Proto $scheme;
+    }
+}

deploy/pobsync.env.example

@@ -0,0 +1,18 @@
+POBSYNC_DJANGO_DEBUG=0
+POBSYNC_DJANGO_SECRET_KEY=change-me-to-a-long-random-secret
+POBSYNC_DJANGO_ALLOWED_HOSTS=backup.example.com,localhost,127.0.0.1
+POBSYNC_DJANGO_CSRF_TRUSTED_ORIGINS=https://backup.example.com
+
+POBSYNC_HOME=/var/lib/pobsync
+POBSYNC_BACKUP_ROOT=/backups
+POBSYNC_SQLITE_PATH=/var/lib/pobsync/pobsync.sqlite3
+POBSYNC_STATIC_ROOT=/var/lib/pobsync/static
+POBSYNC_ENV_FILE=/etc/pobsync/pobsync.env
+POBSYNC_SERVICE_USER=pobsync
+POBSYNC_SERVICE_GROUP=pobsync
+
+POBSYNC_WEB_BIND=127.0.0.1:8010
+POBSYNC_GUNICORN_WORKERS=2
+POBSYNC_GUNICORN_TIMEOUT=120
+POBSYNC_WORKER_INTERVAL=15
+POBSYNC_SCHEDULER_INTERVAL=60

deploy/systemd/pobsync-scheduler.service

@@ -0,0 +1,20 @@
+[Unit]
+Description=pobsync schedule dispatcher
+After=network-online.target pobsync-web.service
+Wants=network-online.target
+
+[Service]
+Type=simple
+User=@POBSYNC_USER@
+Group=@POBSYNC_GROUP@
+WorkingDirectory=@POBSYNC_APP_DIR@
+EnvironmentFile=@POBSYNC_ENV_FILE@
+Environment=POBSYNC_ENV_FILE=@POBSYNC_ENV_FILE@
+Environment=POBSYNC_SERVICE_USER=@POBSYNC_USER@
+Environment=POBSYNC_SERVICE_GROUP=@POBSYNC_GROUP@
+ExecStart=/bin/sh -c 'exec @POBSYNC_VENV_DIR@/bin/python manage.py run_pobsync_scheduler --loop --interval "${POBSYNC_SCHEDULER_INTERVAL:-60}"'
+Restart=on-failure
+RestartSec=5
+
+[Install]
+WantedBy=multi-user.target

deploy/systemd/pobsync-web.service

@@ -0,0 +1,22 @@
+[Unit]
+Description=pobsync Django control panel
+After=network-online.target
+Wants=network-online.target
+
+[Service]
+Type=simple
+User=@POBSYNC_USER@
+Group=@POBSYNC_GROUP@
+WorkingDirectory=@POBSYNC_APP_DIR@
+EnvironmentFile=@POBSYNC_ENV_FILE@
+Environment=POBSYNC_ENV_FILE=@POBSYNC_ENV_FILE@
+Environment=POBSYNC_SERVICE_USER=@POBSYNC_USER@
+Environment=POBSYNC_SERVICE_GROUP=@POBSYNC_GROUP@
+ExecStartPre=@POBSYNC_VENV_DIR@/bin/python manage.py migrate --noinput
+ExecStartPre=@POBSYNC_VENV_DIR@/bin/python manage.py collectstatic --noinput --clear
+ExecStart=/bin/sh -c 'exec @POBSYNC_VENV_DIR@/bin/gunicorn pobsync_server.wsgi:application --bind "${POBSYNC_WEB_BIND:-127.0.0.1:8010}" --workers "${POBSYNC_GUNICORN_WORKERS:-2}" --timeout "${POBSYNC_GUNICORN_TIMEOUT:-120}"'
+Restart=on-failure
+RestartSec=5
+
+[Install]
+WantedBy=multi-user.target

deploy/systemd/pobsync-worker.service

@@ -0,0 +1,20 @@
+[Unit]
+Description=pobsync queued backup worker
+After=network-online.target pobsync-web.service
+Wants=network-online.target
+
+[Service]
+Type=simple
+User=@POBSYNC_USER@
+Group=@POBSYNC_GROUP@
+WorkingDirectory=@POBSYNC_APP_DIR@
+EnvironmentFile=@POBSYNC_ENV_FILE@
+Environment=POBSYNC_ENV_FILE=@POBSYNC_ENV_FILE@
+Environment=POBSYNC_SERVICE_USER=@POBSYNC_USER@
+Environment=POBSYNC_SERVICE_GROUP=@POBSYNC_GROUP@
+ExecStart=/bin/sh -c 'exec @POBSYNC_VENV_DIR@/bin/python manage.py run_pobsync_worker --loop --interval "${POBSYNC_WORKER_INTERVAL:-15}"'
+Restart=on-failure
+RestartSec=5
+
+[Install]
+WantedBy=multi-user.target

docker-compose.yml

@@ -0,0 +1,167 @@
+services:
+  web:
+    build: .
+    command: gunicorn pobsync_server.wsgi:application --bind 0.0.0.0:8000 --workers ${POBSYNC_GUNICORN_WORKERS:-2} --timeout ${POBSYNC_GUNICORN_TIMEOUT:-120}
+    restart: unless-stopped
+    environment:
+      POBSYNC_DJANGO_DEBUG: "${POBSYNC_DJANGO_DEBUG:-0}"
+      POBSYNC_DJANGO_SECRET_KEY: "${POBSYNC_DJANGO_SECRET_KEY:-dev-only-change-me}"
+      POBSYNC_DJANGO_ALLOWED_HOSTS: "${POBSYNC_DJANGO_ALLOWED_HOSTS:-localhost,127.0.0.1,0.0.0.0}"
+      POBSYNC_HOME: "/opt/pobsync"
+      POBSYNC_SQLITE_PATH: "/var/lib/pobsync/pobsync.sqlite3"
+    ports:
+      - "${POBSYNC_WEB_BIND:-0.0.0.0}:8010:8000"
+    volumes:
+      - pobsync_state:/opt/pobsync
+      - pobsync_db:/var/lib/pobsync
+      - ${POBSYNC_BACKUP_ROOT:-./backups}:/backups
+    healthcheck:
+      test: ["CMD", "python", "manage.py", "check"]
+      interval: 30s
+      timeout: 10s
+      retries: 3
+
+  scheduler:
+    build: .
+    command: python manage.py run_pobsync_scheduler --loop --interval 60
+    restart: unless-stopped
+    environment:
+      POBSYNC_DJANGO_DEBUG: "${POBSYNC_DJANGO_DEBUG:-0}"
+      POBSYNC_DJANGO_SECRET_KEY: "${POBSYNC_DJANGO_SECRET_KEY:-dev-only-change-me}"
+      POBSYNC_DJANGO_ALLOWED_HOSTS: "${POBSYNC_DJANGO_ALLOWED_HOSTS:-localhost,127.0.0.1,0.0.0.0}"
+      POBSYNC_HOME: "/opt/pobsync"
+      POBSYNC_SQLITE_PATH: "/var/lib/pobsync/pobsync.sqlite3"
+    volumes:
+      - pobsync_state:/opt/pobsync
+      - pobsync_db:/var/lib/pobsync
+      - ${POBSYNC_BACKUP_ROOT:-./backups}:/backups
+    healthcheck:
+      test: ["CMD", "python", "manage.py", "check"]
+      interval: 30s
+      timeout: 10s
+      retries: 3
+
+  worker:
+    build: .
+    command: python manage.py run_pobsync_worker --loop --interval 15
+    restart: unless-stopped
+    environment:
+      POBSYNC_DJANGO_DEBUG: "${POBSYNC_DJANGO_DEBUG:-0}"
+      POBSYNC_DJANGO_SECRET_KEY: "${POBSYNC_DJANGO_SECRET_KEY:-dev-only-change-me}"
+      POBSYNC_DJANGO_ALLOWED_HOSTS: "${POBSYNC_DJANGO_ALLOWED_HOSTS:-localhost,127.0.0.1,0.0.0.0}"
+      POBSYNC_HOME: "/opt/pobsync"
+      POBSYNC_SQLITE_PATH: "/var/lib/pobsync/pobsync.sqlite3"
+    volumes:
+      - pobsync_state:/opt/pobsync
+      - pobsync_db:/var/lib/pobsync
+      - ${POBSYNC_BACKUP_ROOT:-./backups}:/backups
+    healthcheck:
+      test: ["CMD", "python", "manage.py", "check"]
+      interval: 30s
+      timeout: 10s
+      retries: 3
+
+  web-mariadb:
+    profiles: ["mariadb"]
+    build: .
+    command: gunicorn pobsync_server.wsgi:application --bind 0.0.0.0:8000 --workers ${POBSYNC_GUNICORN_WORKERS:-2} --timeout ${POBSYNC_GUNICORN_TIMEOUT:-120}
+    restart: unless-stopped
+    environment:
+      POBSYNC_DJANGO_DEBUG: "${POBSYNC_DJANGO_DEBUG:-0}"
+      POBSYNC_DJANGO_SECRET_KEY: "${POBSYNC_DJANGO_SECRET_KEY:-dev-only-change-me}"
+      POBSYNC_DJANGO_ALLOWED_HOSTS: "${POBSYNC_DJANGO_ALLOWED_HOSTS:-localhost,127.0.0.1,0.0.0.0}"
+      POBSYNC_HOME: "/opt/pobsync"
+      POBSYNC_DB_ENGINE: "mariadb"
+      POBSYNC_DB_HOST: "db"
+      POBSYNC_DB_NAME: "pobsync"
+      POBSYNC_DB_USER: "pobsync"
+      POBSYNC_DB_PASSWORD: "pobsync"
+    depends_on:
+      db:
+        condition: service_healthy
+    ports:
+      - "${POBSYNC_WEB_BIND:-0.0.0.0}:8010:8000"
+    volumes:
+      - pobsync_state:/opt/pobsync
+      - ${POBSYNC_BACKUP_ROOT:-./backups}:/backups
+    healthcheck:
+      test: ["CMD", "python", "manage.py", "check"]
+      interval: 30s
+      timeout: 10s
+      retries: 3
+
+  scheduler-mariadb:
+    profiles: ["mariadb"]
+    build: .
+    command: python manage.py run_pobsync_scheduler --loop --interval 60
+    restart: unless-stopped
+    environment:
+      POBSYNC_DJANGO_DEBUG: "${POBSYNC_DJANGO_DEBUG:-0}"
+      POBSYNC_DJANGO_SECRET_KEY: "${POBSYNC_DJANGO_SECRET_KEY:-dev-only-change-me}"
+      POBSYNC_DJANGO_ALLOWED_HOSTS: "${POBSYNC_DJANGO_ALLOWED_HOSTS:-localhost,127.0.0.1,0.0.0.0}"
+      POBSYNC_HOME: "/opt/pobsync"
+      POBSYNC_DB_ENGINE: "mariadb"
+      POBSYNC_DB_HOST: "db"
+      POBSYNC_DB_NAME: "pobsync"
+      POBSYNC_DB_USER: "pobsync"
+      POBSYNC_DB_PASSWORD: "pobsync"
+    depends_on:
+      db:
+        condition: service_healthy
+    volumes:
+      - pobsync_state:/opt/pobsync
+      - ${POBSYNC_BACKUP_ROOT:-./backups}:/backups
+    healthcheck:
+      test: ["CMD", "python", "manage.py", "check"]
+      interval: 30s
+      timeout: 10s
+      retries: 3
+
+  worker-mariadb:
+    profiles: ["mariadb"]
+    build: .
+    command: python manage.py run_pobsync_worker --loop --interval 15
+    restart: unless-stopped
+    environment:
+      POBSYNC_DJANGO_DEBUG: "${POBSYNC_DJANGO_DEBUG:-0}"
+      POBSYNC_DJANGO_SECRET_KEY: "${POBSYNC_DJANGO_SECRET_KEY:-dev-only-change-me}"
+      POBSYNC_DJANGO_ALLOWED_HOSTS: "${POBSYNC_DJANGO_ALLOWED_HOSTS:-localhost,127.0.0.1,0.0.0.0}"
+      POBSYNC_HOME: "/opt/pobsync"
+      POBSYNC_DB_ENGINE: "mariadb"
+      POBSYNC_DB_HOST: "db"
+      POBSYNC_DB_NAME: "pobsync"
+      POBSYNC_DB_USER: "pobsync"
+      POBSYNC_DB_PASSWORD: "pobsync"
+    depends_on:
+      db:
+        condition: service_healthy
+    volumes:
+      - pobsync_state:/opt/pobsync
+      - ${POBSYNC_BACKUP_ROOT:-./backups}:/backups
+    healthcheck:
+      test: ["CMD", "python", "manage.py", "check"]
+      interval: 30s
+      timeout: 10s
+      retries: 3
+
+  db:
+    profiles: ["mariadb"]
+    image: mariadb:11
+    restart: unless-stopped
+    environment:
+      MARIADB_DATABASE: "pobsync"
+      MARIADB_USER: "pobsync"
+      MARIADB_PASSWORD: "pobsync"
+      MARIADB_ROOT_PASSWORD: "pobsync-root"
+    volumes:
+      - mariadb_data:/var/lib/mysql
+    healthcheck:
+      test: ["CMD", "healthcheck.sh", "--connect", "--innodb_initialized"]
+      interval: 5s
+      timeout: 5s
+      retries: 20
+
+volumes:
+  pobsync_state:
+  pobsync_db:
+  mariadb_data:

docs/development.md

@@ -0,0 +1,177 @@
+# Development Notes
+
+This document contains development and optional Docker workflows. The recommended production path is the native
+systemd installer documented in the README.
+
+## Local Development
+
+```
+python3 -m venv .venv
+. .venv/bin/activate
+python3 -m pip install -e .
+mkdir -p var
+python3 manage.py migrate
+python3 manage.py createsuperuser
+python3 manage.py runserver
+```
+
+The admin is available at:
+
+- http://127.0.0.1:8000/
+- http://127.0.0.1:8000/admin/
+
+Staff-only JSON endpoints are available at:
+
+- http://127.0.0.1:8000/api/
+- http://127.0.0.1:8000/api/status/
+
+## Running Tests
+
+The project test suite is currently run through the Docker image so the runtime dependencies match deployment:
+
+```
+docker compose build web scheduler worker
+docker compose run --rm web python manage.py test pobsync_backend --verbosity 2
+```
+
+## Maintainer CLI
+
+The Django UI is the normal operating surface. The `pobsync` entrypoint and direct `manage.py` commands are kept for
+debugging, automated maintenance, and migrations. Prefer using the control panel for day-to-day host configuration,
+schedule changes, manual backup queueing, snapshot discovery, retention planning, and SSH credential management.
+
+Useful checks:
+
+```
+pobsync django check
+python3 manage.py showmigrations pobsync_backend
+```
+
+The short `pobsync` aliases are limited to operational actions that are useful while debugging a running install.
+Configuration aliases are intentionally not public commands; use the Django UI or explicit management commands instead.
+
+Worker and scheduler commands are normally run by systemd services:
+
+```
+pobsync worker --loop --interval 15
+pobsync scheduler --loop --interval 60
+```
+
+One-off maintenance commands are still available when the UI is not the right tool:
+
+```
+pobsync backup <host> --dry-run
+pobsync discover-snapshots --host <host>
+pobsync retention <host>
+```
+
+For scripted configuration changes, call the Django management command explicitly so it is clear that this is an
+automation/debugging path rather than the normal UI workflow:
+
+```
+pobsync django configure_pobsync_host <host> --address <host.example>
+pobsync django configure_pobsync_schedule <host> --schedule-expression "15 2 * * *"
+```
+
+## Installer Development
+
+The native installer is interactive by default when stdin is a terminal. It should keep every prompt backed by a command
+line flag or environment variable so production installs remain scriptable.
+
+Useful modes:
+
+```
+sudo scripts/install-systemd
+sudo scripts/install-systemd --non-interactive
+sudo scripts/install-systemd --verbose
+sudo scripts/install-systemd --create-superuser --superuser-username admin
+sudo scripts/update-systemd
+```
+
+The installer should print a short completion summary with the control panel URL, Self Check reminder, and service log
+commands. Keep normal output user-facing: pobsync step names with OK, FAILED, or SKIPPED. Full apt, pip, Django, and
+systemd output belongs behind `--verbose` or in the failed step output.
+
+The updater is intentionally a small wrapper around the installer for routine production deploys. It should stay
+non-interactive, preserve the existing environment file, skip OS package installation, skip superuser creation, and still
+run the Django/runtime refresh steps needed after a code update.
+
+## Docker With SQLite
+
+Docker Compose is useful for local development and disposable test installs. Native systemd is preferred for production
+backup servers.
+
+```
+docker compose up --build web
+```
+
+This starts Django on:
+
+- http://127.0.0.1:8010/
+- http://127.0.0.1:8010/admin/
+- http://127.0.0.1:8010/api/
+- http://127.0.0.1:8010/api/status/
+
+Run the scheduler alongside the web admin:
+
+```
+docker compose up --build web scheduler worker
+```
+
+The web service runs Django through Gunicorn and serves static files with WhiteNoise. The container persists
+`/opt/pobsync` and the SQLite database in Docker volumes.
+
+Backup data is always available at `/backups` inside the containers. By default this uses `./backups` on the host.
+Override the host-side mount with `POBSYNC_BACKUP_ROOT`:
+
+```
+POBSYNC_BACKUP_ROOT=/mnt/backups/pobsync docker compose up --build web scheduler worker
+```
+
+## Docker With MariaDB
+
+```
+docker compose --profile mariadb up --build web-mariadb
+```
+
+With the scheduler:
+
+```
+docker compose --profile mariadb up --build web-mariadb scheduler-mariadb worker-mariadb
+```
+
+SQLite remains the default because it is enough for a single backup server and keeps deployment simple.
+
+For native systemd installs with MariaDB client support, run the installer with:
+
+```
+sudo scripts/install-systemd --install-extras mariadb
+```
+
+## Current Architecture
+
+The public operating surface is Django-first. The CLI is now a maintainer layer around Django management commands and
+the old YAML/cron workflow has been retired from the `pobsync` entrypoint.
+Discovered snapshots are stored in `SnapshotRecord`, including the base snapshot metadata and a nullable SQL link to the
+base record when it is known.
+
+The Django retention command plans from `SnapshotRecord` instead of rediscovering snapshots from the filesystem.
+Post-backup pruning from Django also uses the SQL retention service after the completed snapshot is recorded.
+Staff-only JSON endpoints expose service status, hosts, snapshots, and backup runs for lightweight inspection.
+Staff-only dashboard views expose the same operational state through Django templates.
+Host pages include a safe snapshot discovery action that records existing snapshots into SQL.
+Host pages also include a read-only SQL retention plan view before any destructive pruning action.
+Schedules can be created or updated from host pages using the same SQL-backed scheduler model.
+Host config can be edited from host pages while keeping host identity stable.
+
+The remaining internal engine code still contains reusable backup primitives:
+
+- snapshot naming and metadata
+- rsync command construction and execution
+- retention planning and pruning
+- host locking
+
+Next refactor targets:
+
+- Move more snapshot lifecycle details into typed domain objects.
+- Replace remaining dictionary-shaped config at engine boundaries.

manage.py

@@ -0,0 +1,16 @@
+#!/usr/bin/env python3
+from __future__ import annotations
+
+import os
+import sys
+
+
+def main() -> None:
+    os.environ.setdefault("DJANGO_SETTINGS_MODULE", "pobsync_server.settings")
+    from django.core.management import execute_from_command_line
+
+    execute_from_command_line(sys.argv)
+
+
+if __name__ == "__main__":
+    main()

pyproject.toml

@@ -4,13 +4,21 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "pobsync"
-version = "0.1.0"
+version = "1.0.0"
 description = "Pull-based rsync backup tool with hardlinked snapshots"
 requires-python = ">=3.11"
 dependencies = [
+  "Django>=5.2,<6.0",
+  "gunicorn>=23.0,<24.0",
+  "whitenoise>=6.9,<7.0",
   "PyYAML>=6.0"
 ]
 
+[project.optional-dependencies]
+mariadb = [
+  "mysqlclient>=2.2"
+]
+
 [project.scripts]
 pobsync = "pobsync.cli:main"
 

scripts/docker-entrypoint

@@ -0,0 +1,9 @@
+#!/bin/sh
+set -eu
+
+mkdir -p "$(dirname "${POBSYNC_SQLITE_PATH:-/var/lib/pobsync/pobsync.sqlite3}")"
+
+python manage.py migrate --noinput
+python manage.py collectstatic --noinput --clear
+
+exec "$@"

scripts/install-systemd

@@ -0,0 +1,594 @@
+#!/bin/sh
+set -eu
+
+SOURCE_DIR=${POBSYNC_SOURCE_DIR:-$(CDPATH= cd -- "$(dirname -- "$0")/.." && pwd)}
+APP_DIR=${POBSYNC_APP_DIR:-/opt/pobsync/app}
+VENV_DIR=${POBSYNC_VENV_DIR:-/opt/pobsync/venv}
+ENV_FILE=${POBSYNC_ENV_FILE:-/etc/pobsync/pobsync.env}
+SERVICE_USER=${POBSYNC_SERVICE_USER:-pobsync}
+SERVICE_GROUP=${POBSYNC_SERVICE_GROUP:-pobsync}
+INSTALL_EXTRAS=${POBSYNC_INSTALL_EXTRAS:-}
+SERVER_NAME=${POBSYNC_SERVER_NAME:-_}
+ALLOWED_HOSTS=${POBSYNC_ALLOWED_HOSTS:-localhost,127.0.0.1}
+CSRF_TRUSTED_ORIGINS=${POBSYNC_CSRF_TRUSTED_ORIGINS:-}
+BACKUP_ROOT=${POBSYNC_BACKUP_ROOT:-/backups}
+BACKUP_ROOT_EXPLICIT=0
+if [ -n "${POBSYNC_BACKUP_ROOT:-}" ]; then
+    BACKUP_ROOT_EXPLICIT=1
+fi
+WEB_BIND=${POBSYNC_WEB_BIND:-127.0.0.1:8010}
+TIME_ZONE=${POBSYNC_TIME_ZONE:-}
+FORCE_ENV=0
+INSTALL_OS_PACKAGES=1
+WITH_NGINX=0
+VERBOSE=0
+INTERACTIVE=0
+CREATE_SUPERUSER=ask
+SUPERUSER_USERNAME=${POBSYNC_SUPERUSER_USERNAME:-}
+SUPERUSER_EMAIL=${POBSYNC_SUPERUSER_EMAIL:-}
+SUPERUSER_PASSWORD=${POBSYNC_SUPERUSER_PASSWORD:-}
+
+if [ -t 0 ]; then
+    INTERACTIVE=1
+fi
+
+while [ "$#" -gt 0 ]; do
+    case "$1" in
+        --source-dir)
+            SOURCE_DIR=$2
+            shift 2
+            ;;
+        --app-dir)
+            APP_DIR=$2
+            shift 2
+            ;;
+        --venv-dir)
+            VENV_DIR=$2
+            shift 2
+            ;;
+        --env-file)
+            ENV_FILE=$2
+            shift 2
+            ;;
+        --service-user)
+            SERVICE_USER=$2
+            shift 2
+            ;;
+        --service-group)
+            SERVICE_GROUP=$2
+            shift 2
+            ;;
+        --backup-root)
+            BACKUP_ROOT=$2
+            BACKUP_ROOT_EXPLICIT=1
+            shift 2
+            ;;
+        --allowed-hosts)
+            ALLOWED_HOSTS=$2
+            shift 2
+            ;;
+        --csrf-trusted-origins)
+            CSRF_TRUSTED_ORIGINS=$2
+            shift 2
+            ;;
+        --web-bind)
+            WEB_BIND=$2
+            shift 2
+            ;;
+        --time-zone)
+            TIME_ZONE=$2
+            shift 2
+            ;;
+        --force-env)
+            FORCE_ENV=1
+            shift
+            ;;
+        --verbose)
+            VERBOSE=1
+            shift
+            ;;
+        --interactive)
+            INTERACTIVE=1
+            shift
+            ;;
+        --non-interactive)
+            INTERACTIVE=0
+            shift
+            ;;
+        --no-install-os-packages)
+            INSTALL_OS_PACKAGES=0
+            shift
+            ;;
+        --install-extras)
+            INSTALL_EXTRAS=$2
+            shift 2
+            ;;
+        --with-nginx)
+            WITH_NGINX=1
+            shift
+            ;;
+        --server-name)
+            SERVER_NAME=$2
+            shift 2
+            ;;
+        --create-superuser)
+            CREATE_SUPERUSER=1
+            shift
+            ;;
+        --no-create-superuser)
+            CREATE_SUPERUSER=0
+            shift
+            ;;
+        --superuser-username)
+            SUPERUSER_USERNAME=$2
+            shift 2
+            ;;
+        --superuser-email)
+            SUPERUSER_EMAIL=$2
+            shift 2
+            ;;
+        --superuser-password)
+            SUPERUSER_PASSWORD=$2
+            shift 2
+            ;;
+        *)
+            echo "Unknown argument: $1" >&2
+            exit 2
+            ;;
+    esac
+done
+
+if [ "$(id -u)" -ne 0 ]; then
+    echo "Run this installer as root." >&2
+    exit 1
+fi
+
+if [ -f "$ENV_FILE" ] && [ "$FORCE_ENV" -ne 1 ] && [ "$BACKUP_ROOT_EXPLICIT" -ne 1 ]; then
+    set -a
+    # shellcheck disable=SC1090
+    . "$ENV_FILE"
+    set +a
+    if [ -n "${POBSYNC_BACKUP_ROOT:-}" ]; then
+        BACKUP_ROOT=$POBSYNC_BACKUP_ROOT
+    fi
+fi
+
+detect_time_zone() {
+    if [ -n "$TIME_ZONE" ]; then
+        printf '%s\n' "$TIME_ZONE"
+        return
+    fi
+
+    if [ -n "${POBSYNC_TIME_ZONE:-}" ]; then
+        printf '%s\n' "$POBSYNC_TIME_ZONE"
+        return
+    fi
+
+    if command -v timedatectl >/dev/null 2>&1; then
+        detected=$(timedatectl show -p Timezone --value 2>/dev/null || true)
+        if [ -n "$detected" ]; then
+            printf '%s\n' "$detected"
+            return
+        fi
+    fi
+
+    if [ -f /etc/timezone ]; then
+        detected=$(sed -n '1p' /etc/timezone | tr -d '[:space:]')
+        if [ -n "$detected" ]; then
+            printf '%s\n' "$detected"
+            return
+        fi
+    fi
+
+    printf 'UTC\n'
+}
+
+TIME_ZONE=$(detect_time_zone)
+
+run_step() {
+    label=$1
+    shift
+
+    if [ "$VERBOSE" -eq 1 ]; then
+        echo "==> $label"
+        "$@"
+        echo "OK: $label"
+        return
+    fi
+
+    printf '%-48s' "$label"
+    log_file=$(mktemp)
+    if "$@" >"$log_file" 2>&1; then
+        rm -f "$log_file"
+        echo "OK"
+        return
+    fi
+
+    echo "FAILED"
+    echo
+    echo "Output from failed step '$label':" >&2
+    cat "$log_file" >&2
+    rm -f "$log_file"
+    exit 1
+}
+
+note_step() {
+    label=$1
+    status=$2
+    printf '%-48s%s\n' "$label" "$status"
+}
+
+prompt_value() {
+    prompt=$1
+    default=$2
+    if [ "$INTERACTIVE" -ne 1 ]; then
+        printf '%s\n' "$default"
+        return
+    fi
+
+    printf '%s [%s]: ' "$prompt" "$default" >&2
+    read -r answer
+    if [ -n "$answer" ]; then
+        printf '%s\n' "$answer"
+    else
+        printf '%s\n' "$default"
+    fi
+}
+
+prompt_yes_no() {
+    prompt=$1
+    default=$2
+    if [ "$INTERACTIVE" -ne 1 ]; then
+        printf '%s\n' "$default"
+        return
+    fi
+
+    if [ "$default" -eq 1 ]; then
+        suffix=Y/n
+    else
+        suffix=y/N
+    fi
+
+    while :; do
+        printf '%s [%s]: ' "$prompt" "$suffix" >&2
+        read -r answer
+        case "$answer" in
+            "")
+                printf '%s\n' "$default"
+                return
+                ;;
+            y|Y|yes|YES|Yes)
+                printf '1\n'
+                return
+                ;;
+            n|N|no|NO|No)
+                printf '0\n'
+                return
+                ;;
+        esac
+    done
+}
+
+prompt_secret() {
+    prompt=$1
+    if [ "$INTERACTIVE" -ne 1 ]; then
+        printf '\n'
+        return
+    fi
+
+    printf '%s: ' "$prompt" >&2
+    stty -echo
+    read -r secret
+    stty echo
+    printf '\n' >&2
+    printf '%s\n' "$secret"
+}
+
+if [ "$INTERACTIVE" -eq 1 ]; then
+    echo "pobsync native installer"
+    echo
+    echo "Press Enter to accept defaults. Existing command-line flags are already applied as defaults."
+    echo
+
+    SOURCE_DIR=$(prompt_value "Source checkout" "$SOURCE_DIR")
+    APP_DIR=$(prompt_value "Install app directory" "$APP_DIR")
+    VENV_DIR=$(prompt_value "Python virtualenv directory" "$VENV_DIR")
+    ENV_FILE=$(prompt_value "Environment file" "$ENV_FILE")
+    SERVICE_USER=$(prompt_value "Service user" "$SERVICE_USER")
+    SERVICE_GROUP=$(prompt_value "Service group" "$SERVICE_GROUP")
+    BACKUP_ROOT=$(prompt_value "Backup storage path" "$BACKUP_ROOT")
+    WEB_BIND=$(prompt_value "Gunicorn bind address" "$WEB_BIND")
+    TIME_ZONE=$(prompt_value "Scheduler time zone" "$TIME_ZONE")
+    ALLOWED_HOSTS=$(prompt_value "Allowed hosts" "$ALLOWED_HOSTS")
+    CSRF_TRUSTED_ORIGINS=$(prompt_value "CSRF trusted origins, comma-separated or blank" "$CSRF_TRUSTED_ORIGINS")
+    INSTALL_OS_PACKAGES=$(prompt_yes_no "Install required OS packages with apt-get" "$INSTALL_OS_PACKAGES")
+
+    use_mariadb=0
+    if [ "$INSTALL_EXTRAS" = "mariadb" ] || [ "$INSTALL_EXTRAS" = "[mariadb]" ] || [ "$INSTALL_EXTRAS" = ".[mariadb]" ]; then
+        use_mariadb=1
+    fi
+    use_mariadb=$(prompt_yes_no "Install MariaDB Python/client support" "$use_mariadb")
+    if [ "$use_mariadb" -eq 1 ]; then
+        INSTALL_EXTRAS=mariadb
+    else
+        INSTALL_EXTRAS=
+    fi
+
+    WITH_NGINX=$(prompt_yes_no "Install starter nginx reverse proxy config" "$WITH_NGINX")
+    if [ "$WITH_NGINX" -eq 1 ]; then
+        SERVER_NAME=$(prompt_value "Nginx server_name" "$SERVER_NAME")
+    fi
+
+    if [ "$CREATE_SUPERUSER" = "ask" ]; then
+        CREATE_SUPERUSER=$(prompt_yes_no "Create first Django superuser after install" 1)
+    fi
+    if [ "$CREATE_SUPERUSER" -eq 1 ]; then
+        SUPERUSER_USERNAME=$(prompt_value "Superuser username" "${SUPERUSER_USERNAME:-admin}")
+        SUPERUSER_EMAIL=$(prompt_value "Superuser email, blank allowed" "$SUPERUSER_EMAIL")
+        if [ -z "$SUPERUSER_PASSWORD" ]; then
+            SUPERUSER_PASSWORD=$(prompt_secret "Superuser password, leave blank to run createsuperuser interactively later")
+        fi
+    fi
+
+    echo
+fi
+
+if [ "$CREATE_SUPERUSER" = "ask" ]; then
+    if [ -n "$SUPERUSER_USERNAME" ] && [ -n "$SUPERUSER_PASSWORD" ]; then
+        CREATE_SUPERUSER=1
+    else
+        CREATE_SUPERUSER=0
+    fi
+fi
+
+install_os_packages() {
+    if [ "$INSTALL_OS_PACKAGES" -ne 1 ]; then
+        note_step "Install OS packages" "SKIPPED"
+        return
+    fi
+
+    if command -v apt-get >/dev/null 2>&1; then
+        packages="python3 python3-venv python3-pip rsync openssh-client"
+        if [ "$WITH_NGINX" -eq 1 ]; then
+            packages="$packages nginx"
+        fi
+        if [ "$INSTALL_EXTRAS" = "mariadb" ] || [ "$INSTALL_EXTRAS" = "[mariadb]" ] || [ "$INSTALL_EXTRAS" = ".[mariadb]" ]; then
+            packages="$packages default-libmysqlclient-dev build-essential pkg-config"
+        fi
+        run_step "Install OS packages" sh -c "apt-get update && apt-get install -y --no-install-recommends $packages"
+        return
+    fi
+
+    echo "No supported package manager found; install python3, python3-venv, rsync, and openssh-client manually." >&2
+}
+
+install_os_packages
+
+if ! command -v python3 >/dev/null 2>&1; then
+    echo "python3 is required." >&2
+    exit 1
+fi
+
+if ! env POBSYNC_INSTALL_TIME_ZONE="$TIME_ZONE" python3 -c "import os; from zoneinfo import ZoneInfo; ZoneInfo(os.environ['POBSYNC_INSTALL_TIME_ZONE'])" >/dev/null 2>&1; then
+    echo "Invalid time zone: $TIME_ZONE" >&2
+    echo "Use an IANA timezone such as UTC or Europe/Amsterdam." >&2
+    exit 1
+fi
+
+if ! command -v rsync >/dev/null 2>&1; then
+    echo "rsync is required." >&2
+    exit 1
+fi
+
+if ! command -v ssh >/dev/null 2>&1; then
+    echo "openssh-client is required." >&2
+    exit 1
+fi
+
+if [ ! -f "$SOURCE_DIR/manage.py" ]; then
+    echo "Source directory does not look like a pobsync checkout: $SOURCE_DIR" >&2
+    exit 1
+fi
+
+if ! getent group "$SERVICE_GROUP" >/dev/null 2>&1; then
+    run_step "Create service group" groupadd --system "$SERVICE_GROUP"
+else
+    note_step "Create service group" "OK"
+fi
+
+if ! id "$SERVICE_USER" >/dev/null 2>&1; then
+    run_step "Create service user" useradd --system --home /var/lib/pobsync --shell /usr/sbin/nologin --gid "$SERVICE_GROUP" "$SERVICE_USER"
+else
+    note_step "Create service user" "OK"
+fi
+
+grant_journal_access() {
+    for group in systemd-journal adm; do
+        if getent group "$group" >/dev/null 2>&1; then
+            usermod -a -G "$group" "$SERVICE_USER"
+        fi
+    done
+}
+
+run_step "Grant journal access" grant_journal_access
+run_step "Prepare directories" mkdir -p /etc/pobsync /var/lib/pobsync /var/log/pobsync "$(dirname "$VENV_DIR")" "$APP_DIR" "$BACKUP_ROOT"
+run_step "Set state directory permissions" chown "$SERVICE_USER:$SERVICE_GROUP" /var/lib/pobsync /var/log/pobsync "$BACKUP_ROOT"
+run_step "Set private directory modes" chmod 0750 /var/lib/pobsync /var/log/pobsync "$BACKUP_ROOT"
+
+if [ "$SOURCE_DIR" != "$APP_DIR" ]; then
+    run_step "Sync application files" rsync -a --delete \
+        --exclude .git \
+        --exclude .venv \
+        --exclude __pycache__ \
+        --exclude .pytest_cache \
+        --exclude .mypy_cache \
+        --exclude var \
+        "$SOURCE_DIR"/ "$APP_DIR"/
+else
+    note_step "Sync application files" "SKIPPED"
+fi
+
+run_step "Create Python virtualenv" python3 -m venv "$VENV_DIR"
+run_step "Upgrade pip" "$VENV_DIR/bin/python" -m pip install --upgrade pip
+case "$INSTALL_EXTRAS" in
+    "")
+        pip_target=$APP_DIR
+        ;;
+    mariadb)
+        pip_target="$APP_DIR[mariadb]"
+        ;;
+    \[*\])
+        pip_target="$APP_DIR$INSTALL_EXTRAS"
+        ;;
+    .\[*\])
+        pip_target="$APP_DIR${INSTALL_EXTRAS#.}"
+        ;;
+    *)
+        echo "Unsupported install extras: $INSTALL_EXTRAS" >&2
+        exit 2
+        ;;
+esac
+run_step "Install Python package" "$VENV_DIR/bin/python" -m pip install -e "$pip_target"
+
+if [ ! -f "$ENV_FILE" ] || [ "$FORCE_ENV" -eq 1 ]; then
+    secret=$("$VENV_DIR/bin/python" -c "import secrets; print(secrets.token_urlsafe(48))")
+    cat > "$ENV_FILE" <<EOF
+POBSYNC_DJANGO_DEBUG=0
+POBSYNC_DJANGO_SECRET_KEY=$secret
+POBSYNC_DJANGO_ALLOWED_HOSTS=$ALLOWED_HOSTS
+POBSYNC_DJANGO_CSRF_TRUSTED_ORIGINS=$CSRF_TRUSTED_ORIGINS
+
+POBSYNC_HOME=/var/lib/pobsync
+POBSYNC_BACKUP_ROOT=$BACKUP_ROOT
+POBSYNC_TIME_ZONE=$TIME_ZONE
+POBSYNC_SQLITE_PATH=/var/lib/pobsync/pobsync.sqlite3
+POBSYNC_STATIC_ROOT=/var/lib/pobsync/static
+POBSYNC_ENV_FILE=$ENV_FILE
+POBSYNC_SERVICE_USER=$SERVICE_USER
+POBSYNC_SERVICE_GROUP=$SERVICE_GROUP
+
+POBSYNC_WEB_BIND=$WEB_BIND
+POBSYNC_GUNICORN_WORKERS=2
+POBSYNC_GUNICORN_TIMEOUT=120
+POBSYNC_WORKER_INTERVAL=15
+POBSYNC_SCHEDULER_INTERVAL=60
+EOF
+    chmod 0640 "$ENV_FILE"
+    chown "root:$SERVICE_GROUP" "$ENV_FILE"
+    note_step "Write environment file" "OK"
+else
+    note_step "Write environment file" "SKIPPED"
+    echo "Keeping existing $ENV_FILE. Use --force-env to rewrite it."
+fi
+
+set -a
+# shellcheck disable=SC1090
+. "$ENV_FILE"
+set +a
+
+install_unit() {
+    src=$1
+    dest=$2
+    sed \
+        -e "s|@POBSYNC_APP_DIR@|$APP_DIR|g" \
+        -e "s|@POBSYNC_VENV_DIR@|$VENV_DIR|g" \
+        -e "s|@POBSYNC_ENV_FILE@|$ENV_FILE|g" \
+        -e "s|@POBSYNC_USER@|$SERVICE_USER|g" \
+        -e "s|@POBSYNC_GROUP@|$SERVICE_GROUP|g" \
+        "$src" > "$dest"
+    chmod 0644 "$dest"
+}
+
+install_units() {
+    install_unit "$APP_DIR/deploy/systemd/pobsync-web.service" /etc/systemd/system/pobsync-web.service
+    install_unit "$APP_DIR/deploy/systemd/pobsync-worker.service" /etc/systemd/system/pobsync-worker.service
+    install_unit "$APP_DIR/deploy/systemd/pobsync-scheduler.service" /etc/systemd/system/pobsync-scheduler.service
+}
+
+run_step "Install systemd units" install_units
+
+install_manage_wrapper() {
+    sed \
+        -e "s|@POBSYNC_APP_DIR@|$APP_DIR|g" \
+        -e "s|@POBSYNC_VENV_DIR@|$VENV_DIR|g" \
+        -e "s|@POBSYNC_ENV_FILE@|$ENV_FILE|g" \
+        -e "s|@POBSYNC_USER@|$SERVICE_USER|g" \
+        -e "s|@POBSYNC_GROUP@|$SERVICE_GROUP|g" \
+        "$APP_DIR/deploy/bin/pobsync-manage" > /usr/local/bin/pobsync-manage
+    chmod 0755 /usr/local/bin/pobsync-manage
+}
+
+run_step "Install manage wrapper" install_manage_wrapper
+
+run_step "Reload systemd" systemctl daemon-reload
+run_step "Run database migrations" /usr/local/bin/pobsync-manage migrate --noinput
+run_step "Ensure default SSH key" /usr/local/bin/pobsync-manage ensure_pobsync_ssh_key --name default --set-global-default
+run_step "Collect static files" /usr/local/bin/pobsync-manage collectstatic --noinput --clear
+run_step "Finalize state permissions" chown -R "$SERVICE_USER:$SERVICE_GROUP" /var/lib/pobsync /var/log/pobsync
+
+superuser_exists=$("$VENV_DIR/bin/python" -c "import os; os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'pobsync_server.settings'); import django; django.setup(); from django.contrib.auth import get_user_model; print('yes' if get_user_model().objects.filter(is_superuser=True).exists() else 'no')")
+if [ "$CREATE_SUPERUSER" -eq 1 ]; then
+    if [ "$superuser_exists" = "yes" ]; then
+        note_step "Create Django superuser" "SKIPPED"
+    elif [ -n "$SUPERUSER_USERNAME" ] && [ -n "$SUPERUSER_PASSWORD" ]; then
+        run_step "Create Django superuser" env \
+            DJANGO_SUPERUSER_USERNAME="$SUPERUSER_USERNAME" \
+            DJANGO_SUPERUSER_EMAIL="$SUPERUSER_EMAIL" \
+            DJANGO_SUPERUSER_PASSWORD="$SUPERUSER_PASSWORD" \
+            /usr/local/bin/pobsync-manage createsuperuser --noinput
+        run_step "Finalize superuser permissions" chown -R "$SERVICE_USER:$SERVICE_GROUP" /var/lib/pobsync /var/log/pobsync
+    else
+        note_step "Create Django superuser" "SKIPPED"
+        echo "No superuser password was provided; create one later with:"
+        echo "  sudo -u $SERVICE_USER pobsync-manage createsuperuser"
+    fi
+elif [ "$superuser_exists" != "yes" ]; then
+    note_step "Create Django superuser" "SKIPPED"
+    echo "No Django superuser exists yet. Create one with:"
+    echo "  sudo -u $SERVICE_USER pobsync-manage createsuperuser"
+else
+    note_step "Create Django superuser" "SKIPPED"
+fi
+
+run_step "Enable services" systemctl enable pobsync-web.service pobsync-worker.service pobsync-scheduler.service
+run_step "Restart services" systemctl restart pobsync-web.service pobsync-worker.service pobsync-scheduler.service
+
+if [ "$WITH_NGINX" -eq 1 ]; then
+    if ! command -v nginx >/dev/null 2>&1; then
+        note_step "Install nginx config" "SKIPPED"
+        echo "nginx is not installed; skipping nginx config." >&2
+    else
+        sed "s|@POBSYNC_SERVER_NAME@|$SERVER_NAME|g" "$APP_DIR/deploy/nginx/pobsync.conf" > /etc/nginx/sites-available/pobsync.conf
+        ln -sf /etc/nginx/sites-available/pobsync.conf /etc/nginx/sites-enabled/pobsync.conf
+        note_step "Install nginx config" "OK"
+        run_step "Validate nginx config" nginx -t
+        run_step "Reload nginx" systemctl reload nginx
+    fi
+else
+    note_step "Install nginx config" "SKIPPED"
+fi
+
+if [ "$VERBOSE" -eq 1 ]; then
+    systemctl --no-pager --full status pobsync-web.service pobsync-worker.service pobsync-scheduler.service || true
+fi
+
+echo
+echo "pobsync installation complete."
+echo
+echo "Open the Django control panel at:"
+echo "  http://$WEB_BIND/"
+echo
+echo "If pobsync is behind a reverse proxy, use your public hostname instead."
+echo
+echo "Recommended first steps:"
+echo "  1. Log in to the Django control panel."
+echo "  2. Open Self Check and resolve any warnings."
+echo "  3. Configure global settings and backup storage."
+echo "  4. Add an SSH key under SSH Keys."
+echo "  5. Add a host and queue a dry-run backup."
+echo
+echo "Useful commands:"
+echo "  systemctl status pobsync-web pobsync-worker pobsync-scheduler"
+echo "  journalctl -u pobsync-worker -f"
+echo "  sudo -u $SERVICE_USER pobsync-manage check"
+echo "  sudo -u $SERVICE_USER pobsync-manage check_pobsync_install"

scripts/update-systemd

@@ -0,0 +1,41 @@
+#!/bin/sh
+set -eu
+
+SCRIPT_DIR=$(CDPATH= cd -- "$(dirname -- "$0")" && pwd)
+
+show_help() {
+    cat <<'EOF'
+Usage: sudo scripts/update-systemd [options]
+
+Refresh an existing native pobsync systemd install from the current checkout.
+
+This is a thin, safer update wrapper around scripts/install-systemd. It keeps
+the install non-interactive, preserves the existing environment file, skips
+superuser creation, and skips OS package installation by default.
+
+Common options are forwarded to install-systemd, for example:
+  --source-dir PATH
+  --app-dir PATH
+  --venv-dir PATH
+  --env-file PATH
+  --service-user USER
+  --service-group GROUP
+  --install-extras mariadb
+  --verbose
+
+If OS packages need to be refreshed, run scripts/install-systemd directly.
+EOF
+}
+
+case "${1:-}" in
+    -h|--help)
+        show_help
+        exit 0
+        ;;
+esac
+
+exec "$SCRIPT_DIR/install-systemd" \
+    --non-interactive \
+    --no-install-os-packages \
+    --no-create-superuser \
+    "$@"

src/pobsync/__init__.py

@@ -1,3 +1,2 @@
 __all__ = ["__version__"]
-__version__ = "0.1.0"
+__version__ = "1.0.0"
-

src/pobsync/cli.py

@@ -1,334 +1,66 @@
 from __future__ import annotations
 
-import argparse
+import os
-import json
+import sys
-from pathlib import Path
+from typing import Sequence
-from typing import Any
 
-from .commands.doctor import run_doctor
+from django.core.management import execute_from_command_line
-from .commands.init_host import run_init_host
+
-from .commands.install import run_install
+from pobsync import __version__
-from .commands.list_remotes import run_list_remotes
-from .commands.run_scheduled import run_scheduled
-from .commands.show_config import dump_yaml, run_show_config
-from .commands.snapshots_list import run_snapshots_list
-from .commands.snapshots_show import run_snapshots_show
-from .errors import ConfigError, DoctorError, InstallError, LockError, PobsyncError
-from .paths import PobsyncPaths
-from .util import is_tty, to_json_safe
 
 
-def build_parser() -> argparse.ArgumentParser:
+COMMAND_ALIASES = {
-    p = argparse.ArgumentParser(prog="pobsync")
+    "backup": "run_pobsync_backup",
-    p.add_argument("--prefix", default="/opt/pobsync", help="Pobsync home directory (default: /opt/pobsync)")
+    "retention": "run_pobsync_retention",
-    p.add_argument("--json", action="store_true", help="Machine-readable JSON output")
+    "discover-snapshots": "discover_pobsync_snapshots",
-    sub = p.add_subparsers(dest="command", required=True)
+    "scheduler": "run_pobsync_scheduler",
-
+    "worker": "run_pobsync_worker",
-    # install
-    ip = sub.add_parser("install", help="Bootstrap /opt/pobsync layout and create global config")
-    ip.add_argument("--backup-root", help="Backup root directory (e.g. /srv/backups)")
-    ip.add_argument("--retention", default="daily=14,weekly=8,monthly=12,yearly=0", help="Default retention for init-host")
-    ip.add_argument("--force", action="store_true", help="Overwrite existing global config")
-    ip.add_argument("--dry-run", action="store_true", help="Show actions, do not write")
-    ip.set_defaults(_handler=cmd_install)
-
-    # init-host
-    hp = sub.add_parser("init-host", help="Create a host config YAML under config/hosts")
-    hp.add_argument("host", help="Host name (used as filename)")
-    hp.add_argument("--address", help="Hostname or IP of the remote")
-    hp.add_argument("--ssh-user", default=None)
-    hp.add_argument("--ssh-port", type=int, default=None)
-    hp.add_argument("--retention", default=None, help="Override retention for this host (daily=...,weekly=...)")
-    hp.add_argument("--exclude-add", action="append", default=[], help="Additional excludes (repeatable)")
-    hp.add_argument("--exclude-replace", action="append", default=None, help="Replace excludes list (repeatable)")
-    hp.add_argument("--include", action="append", default=[], help="Include patterns (repeatable)")
-    hp.add_argument("--force", action="store_true")
-    hp.add_argument("--dry-run", action="store_true")
-    hp.set_defaults(_handler=cmd_init_host)
-
-    # doctor
-    dp = sub.add_parser("doctor", help="Validate installation and configuration")
-    dp.add_argument("host", nargs="?", default=None, help="Optional host to validate")
-    dp.add_argument("--connect", action="store_true", help="Try SSH connectivity check (phase 2)")
-    dp.add_argument("--rsync-dry-run", action="store_true", help="Try rsync dry run (phase 2)")
-    dp.set_defaults(_handler=cmd_doctor)
-
-    # list remotes
-    lp = sub.add_parser("list-remotes", help="List configured remotes (host configs)")
-    lp.set_defaults(_handler=cmd_list_remotes)
-
-    # show config
-    sp = sub.add_parser("show-config", help="Show host configuration (raw or effective)")
-    sp.add_argument("host", help="Host to show")
-    sp.add_argument("--effective", action="store_true", help="Show merged effective config")
-    sp.set_defaults(_handler=cmd_show_config)
-
-    # run scheduled
-    rp = sub.add_parser("run-scheduled", help="Run a scheduled backup for a host")
-    rp.add_argument("host", help="Host to back up")
-    rp.add_argument("--dry-run", action="store_true", help="Run rsync --dry-run without creating directories")
-    rp.set_defaults(_handler=cmd_run_scheduled)
-
-    # snapshots
-    sn = sub.add_parser("snapshots", help="Inspect snapshots (list/show)")
-    sn_sub = sn.add_subparsers(dest="snapshots_cmd", required=True)
-
-    sn_list = sn_sub.add_parser("list", help="List snapshots for a host")
-    sn_list.add_argument("host", help="Host name")
-    sn_list.add_argument("--kind", default="all", help="scheduled|manual|incomplete|all (default: all)")
-    sn_list.add_argument("--limit", type=int, default=20, help="Max results (default: 20)")
-    sn_list.add_argument("--include-incomplete", action="store_true", help="Include .incomplete when --kind=all (default: false)")
-    sn_list.set_defaults(_handler=cmd_snapshots_list)
-
-    sn_show = sn_sub.add_parser("show", help="Show snapshot metadata")
-    sn_show.add_argument("host", help="Host name")
-    sn_show.add_argument("--kind", required=True, help="scheduled|manual|incomplete")
-    sn_show.add_argument("dirname", help="Snapshot directory name (e.g. 20260202-223807Z__K3VQEVH7)")
-    sn_show.add_argument("--tail", type=int, default=None, help="Show last N lines of rsync.log")
-    sn_show.set_defaults(_handler=cmd_snapshots_show)
-
-    return p
-
-
-def parse_retention(s: str) -> dict[str, int]:
-    out: dict[str, int] = {}
-    parts = [p.strip() for p in s.split(",") if p.strip()]
-    for part in parts:
-        if "=" not in part:
-            raise ValueError(f"Invalid retention component: {part!r}")
-        k, v = part.split("=", 1)
-        k = k.strip()
-        v = v.strip()
-        if k not in {"daily", "weekly", "monthly", "yearly"}:
-            raise ValueError(f"Invalid retention key: {k!r}")
-        n = int(v)
-        if n < 0:
-            raise ValueError(f"Retention must be >= 0 for {k}")
-        out[k] = n
-    for k in ("daily", "weekly", "monthly", "yearly"):
-        out.setdefault(k, 0)
-    return out
-
-
-def _print(result: dict[str, Any], as_json: bool) -> None:
-    if as_json:
-        print(json.dumps(to_json_safe(result), indent=2, sort_keys=False))
-        return
-
-    if result.get("ok") is True:
-        print("OK")
-    else:
-        print("FAILED")
-
-    if "actions" in result:
-        for a in result["actions"]:
-            print(f"- {a}")
-
-    if "action" in result:
-        print(f"- {result['action']}")
-
-    if "results" in result:
-        for r in result["results"]:
-            ok = r.get("ok", False)
-            label = "OK" if ok else "FAIL"
-            name = r.get("check", "check")
-            msg = r.get("message") or r.get("error") or ""
-
-            extra = ""
-            if "path" in r:
-                extra = f" ({r['path']})"
-            elif "name" in r:
-                extra = f" ({r['name']})"
-            elif "host" in r:
-                extra = f" ({r['host']})"
-
-            line = f"- {label} {name}{extra}"
-            if msg:
-                line += f" {msg}"
-            print(line)
-
-    if "hosts" in result:
-        for h in result["hosts"]:
-            print(h)
-
-    if "snapshot" in result:
-        print(f"- snapshot {result['snapshot']}")
-
-    if "base" in result and result["base"]:
-        print(f"- base {result['base']}")
-
-    if "snapshots" in result:
-        for s in result["snapshots"]:
-            kind = s.get("kind", "?")
-            dirname = s.get("dirname", "?")
-            status = s.get("status") or "unknown"
-            started_at = s.get("started_at") or ""
-            dur = s.get("duration_seconds")
-            dur_s = f"{dur}s" if isinstance(dur, int) else ""
-            extra = " ".join(x for x in [started_at, dur_s] if x)
-            if extra:
-                extra = " " + extra
-            print(f"- {kind} {dirname} {status}{extra}")
-
-
-def cmd_install(args: argparse.Namespace) -> int:
-    prefix = Path(args.prefix)
-    retention = parse_retention(args.retention)
-
-    backup_root = args.backup_root
-    if backup_root is None and is_tty():
-        backup_root = input("backup_root (absolute path, not '/'): ").strip() or None
-
-    result = run_install(
-        prefix=prefix,
-        backup_root=backup_root,
-        retention=retention,
-        dry_run=bool(args.dry_run),
-        force=bool(args.force),
-    )
-    _print(result, as_json=bool(args.json))
-    return 0 if result.get("ok") else 1
-
-
-def cmd_init_host(args: argparse.Namespace) -> int:
-    prefix = Path(args.prefix)
-
-    address = args.address
-    if address is None and is_tty():
-        address = input("address (hostname or ip): ").strip() or None
-    if not address:
-        raise ConfigError("--address is required (or interactive input)")
-
-    if args.retention is None:
-        from .config.load import load_global_config
-
-        paths = PobsyncPaths(home=prefix)
-        global_cfg = load_global_config(paths.global_config_path)
-        retention = global_cfg.get("retention_defaults") or {
-            "daily": 14,
-            "weekly": 8,
-            "monthly": 12,
-            "yearly": 0,
 }
+
+
+def _usage() -> str:
+    commands = "\n".join(f"  {name}" for name in sorted(COMMAND_ALIASES))
+    return f"""pobsync is now backed by Django management commands.
+
+Usage:
+  pobsync <command> [options]
+  pobsync django <management-command> [options]
+
+Commands:
+{commands}
+
+Configuration is managed from the Django control panel. Use
+`pobsync django <management-command>` for automation or debugging.
+"""
+
+
+def main(argv: Sequence[str] | None = None) -> int:
+    args = list(sys.argv[1:] if argv is None else argv)
+    if args and args[0] in {"--version", "version"}:
+        print(f"pobsync {__version__}")
+        return 0
+    if not args or args[0] in {"-h", "--help", "help"}:
+        print(_usage())
+        return 0
+
+    os.environ.setdefault("DJANGO_SETTINGS_MODULE", "pobsync_server.settings")
+
+    command = args[0]
+    if command == "django":
+        django_args = ["pobsync", *args[1:]]
     else:
-        retention = parse_retention(args.retention)
+        mapped = COMMAND_ALIASES.get(command)
-
+        if mapped is None:
-    excludes_replace = args.exclude_replace if args.exclude_replace is not None else None
+            print(f"Unknown pobsync command: {command}", file=sys.stderr)
-
+            print(_usage(), file=sys.stderr)
-    result = run_init_host(
+            return 2
-        prefix=prefix,
+        django_args = ["pobsync", mapped, *args[1:]]
-        host=args.host,
-        address=address,
-        retention=retention,
-        ssh_user=args.ssh_user,
-        ssh_port=args.ssh_port,
-        excludes_add=list(args.exclude_add),
-        excludes_replace=excludes_replace,
-        includes=list(args.include),
-        dry_run=bool(args.dry_run),
-        force=bool(args.force),
-    )
-    _print(result, as_json=bool(args.json))
-    return 0 if result.get("ok") else 1
-
-
-def cmd_show_config(args: argparse.Namespace) -> int:
-    prefix = Path(args.prefix)
-    result = run_show_config(prefix=prefix, host=args.host, effective=bool(args.effective))
-
-    if args.json:
-        _print(result, as_json=True)
-    else:
-        print(dump_yaml(result["config"]).rstrip())
-
-    return 0 if result.get("ok") else 1
-
-
-def cmd_doctor(args: argparse.Namespace) -> int:
-    prefix = Path(args.prefix)
-    result = run_doctor(
-        prefix=prefix,
-        host=args.host,
-        connect=bool(args.connect),
-        rsync_dry_run=bool(args.rsync_dry_run),
-    )
-    _print(result, as_json=bool(args.json))
-    return 0 if result.get("ok") else 1
-
-
-def cmd_list_remotes(args: argparse.Namespace) -> int:
-    prefix = Path(args.prefix)
-    result = run_list_remotes(prefix=prefix)
-    _print(result, as_json=bool(args.json))
-    return 0 if result.get("ok") else 1
-
-
-def cmd_run_scheduled(args: argparse.Namespace) -> int:
-    prefix = Path(args.prefix)
-    result = run_scheduled(prefix=prefix, host=args.host, dry_run=bool(args.dry_run))
-    _print(result, as_json=bool(args.json))
-    return 0 if result.get("ok") else 2
-
-
-def cmd_snapshots_list(args: argparse.Namespace) -> int:
-    prefix = Path(args.prefix)
-    result = run_snapshots_list(
-        prefix=prefix,
-        host=args.host,
-        kind=args.kind,
-        limit=int(args.limit),
-        include_incomplete=bool(args.include_incomplete),
-    )
-    _print(result, as_json=bool(args.json))
-    return 0 if result.get("ok") else 1
-
-
-def cmd_snapshots_show(args: argparse.Namespace) -> int:
-    prefix = Path(args.prefix)
-    result = run_snapshots_show(
-        prefix=prefix,
-        host=args.host,
-        kind=args.kind,
-        dirname=args.dirname,
-        tail=args.tail,
-    )
-
-    if args.json:
-        _print(result, as_json=True)
-    else:
-        print(dump_yaml(result.get("meta", {})).rstrip())
-        if result.get("log_path"):
-            print(f"\n# rsync.log: {result['log_path']}")
-
-        if result.get("log_tail"):
-            print("\n# rsync.log (tail)")
-            for line in result["log_tail"]:
-                print(line)
-
-    return 0 if result.get("ok") else 1
-
-
-def main(argv: list[str] | None = None) -> int:
-    parser = build_parser()
-    args = parser.parse_args(argv)
 
     try:
-        handler = getattr(args, "_handler")
+        execute_from_command_line(django_args)
-        return int(handler(args))
+    except SystemExit as exc:
-
+        code = exc.code
-    except PobsyncError as e:
+        if isinstance(code, int):
-        if args.json:
+            return code
-            _print({"ok": False, "error": str(e), "type": type(e).__name__}, as_json=True)
-        else:
-            print(f"ERROR: {e}")
-        if isinstance(e, LockError):
-            return 10
         return 1
-
+    return 0
-    except KeyboardInterrupt:
-        if args.json:
-            _print({"ok": False, "error": "interrupted"}, as_json=True)
-        else:
-            print("ERROR: interrupted")
-        return 130
-

src/pobsync/commands/doctor.py

@@ -1,111 +0,0 @@
-from __future__ import annotations
-
-import os
-import shutil
-from pathlib import Path
-from typing import Any
-
-from ..config.load import load_global_config, load_host_config
-from ..errors import DoctorError
-from ..paths import PobsyncPaths
-from ..util import is_absolute_non_root
-
-
-def _check_binary(name: str) -> tuple[bool, str]:
-    p = shutil.which(name)
-    if not p:
-        return False, f"missing binary: {name}"
-    return True, f"ok: {name} -> {p}"
-
-
-def _check_writable_dir(path: Path) -> tuple[bool, str]:
-    try:
-        path.mkdir(parents=True, exist_ok=True)
-    except OSError as e:
-        return False, f"cannot create dir {path}: {e}"
-    try:
-        test = path / ".pobsync_write_test"
-        test.write_text("test", encoding="utf-8")
-        test.unlink(missing_ok=True)
-    except OSError as e:
-        return False, f"not writable: {path}: {e}"
-    return True, f"ok: writable {path}"
-
-
-def run_doctor(prefix: Path, host: str | None, connect: bool, rsync_dry_run: bool) -> dict[str, Any]:
-    # Phase 1 doctor does not perform network checks yet (connect/rsync_dry_run acknowledged).
-    paths = PobsyncPaths(home=prefix)
-
-    results: list[dict[str, Any]] = []
-    ok = True
-
-    # Check required layout
-    for d in (paths.config_dir, paths.hosts_dir, paths.state_dir, paths.locks_dir, paths.logs_dir):
-        exists = d.exists()
-        results.append({"check": "path_exists", "path": str(d), "ok": exists})
-        if not exists:
-            ok = False
-
-    # Load and validate global config
-    global_cfg: dict[str, Any] | None = None
-    if paths.global_config_path.exists():
-        try:
-            global_cfg = load_global_config(paths.global_config_path)
-            results.append({"check": "global_config", "path": str(paths.global_config_path), "ok": True})
-        except Exception as e:
-            ok = False
-            results.append({"check": "global_config", "path": str(paths.global_config_path), "ok": False, "error": str(e)})
-    else:
-        ok = False
-        results.append({"check": "global_config", "path": str(paths.global_config_path), "ok": False, "error": "missing"})
-
-    # Basic binaries
-    b1, m1 = _check_binary("rsync")
-    results.append({"check": "binary", "name": "rsync", "ok": b1, "message": m1})
-    ok = ok and b1
-    b2, m2 = _check_binary("ssh")
-    results.append({"check": "binary", "name": "ssh", "ok": b2, "message": m2})
-    ok = ok and b2
-
-    # backup_root checks
-    if global_cfg is not None:
-        backup_root = global_cfg.get("backup_root")
-        if isinstance(backup_root, str) and is_absolute_non_root(backup_root):
-            br = Path(backup_root)
-            w_ok, w_msg = _check_writable_dir(br)
-            results.append({"check": "backup_root", "path": str(br), "ok": w_ok, "message": w_msg})
-            ok = ok and w_ok
-        else:
-            ok = False
-            results.append({"check": "backup_root", "ok": False, "error": "invalid backup_root"})
-    else:
-        results.append({"check": "backup_root", "ok": False, "error": "global config not loaded"})
-
-    # host checks
-    if host is not None:
-        host_path = paths.hosts_dir / f"{host}.yaml"
-        if not host_path.exists():
-            ok = False
-            results.append({"check": "host_config", "host": host, "ok": False, "error": f"missing {host_path}"})
-        else:
-            try:
-                _ = load_host_config(host_path)
-                results.append({"check": "host_config", "host": host, "ok": True, "path": str(host_path)})
-            except Exception as e:
-                ok = False
-                results.append({"check": "host_config", "host": host, "ok": False, "path": str(host_path), "error": str(e)})
-
-    # Phase 1: report that connect/rsync_dry_run are not implemented yet
-    if connect:
-        results.append({"check": "connect", "ok": False, "error": "not implemented in phase 1"})
-        ok = False
-    if rsync_dry_run:
-        results.append({"check": "rsync_dry_run", "ok": False, "error": "not implemented in phase 1"})
-        ok = False
-
-    if not ok:
-        # Do not raise; return structured report. CLI will map to exit code 1.
-        return {"ok": False, "results": results}
-
-    return {"ok": True, "results": results}
-

src/pobsync/commands/init_host.py

@@ -1,82 +0,0 @@
-from __future__ import annotations
-
-from pathlib import Path
-from typing import Any
-
-import yaml
-
-from ..errors import ConfigError
-from ..paths import PobsyncPaths
-from ..util import sanitize_host
-
-
-def build_host_config(
-    host: str,
-    address: str,
-    retention: dict[str, int],
-    ssh_user: str | None = None,
-    ssh_port: int | None = None,
-    excludes_add: list[str] | None = None,
-    excludes_replace: list[str] | None = None,
-    includes: list[str] | None = None,
-) -> dict[str, Any]:
-    cfg: dict[str, Any] = {
-        "host": host,
-        "address": address,
-        "retention": retention,
-        "includes": includes or [],
-    }
-    if ssh_user is not None or ssh_port is not None:
-        cfg["ssh"] = {}
-        if ssh_user is not None:
-            cfg["ssh"]["user"] = ssh_user
-        if ssh_port is not None:
-            cfg["ssh"]["port"] = ssh_port
-
-    if excludes_replace is not None:
-        cfg["excludes_replace"] = excludes_replace
-    else:
-        cfg["excludes_add"] = excludes_add or []
-    return cfg
-
-
-def run_init_host(
-    prefix: Path,
-    host: str,
-    address: str,
-    retention: dict[str, int],
-    ssh_user: str | None,
-    ssh_port: int | None,
-    excludes_add: list[str],
-    excludes_replace: list[str] | None,
-    includes: list[str],
-    dry_run: bool,
-    force: bool,
-) -> dict[str, Any]:
-    host = sanitize_host(host)
-    paths = PobsyncPaths(home=prefix)
-    target = paths.hosts_dir / f"{host}.yaml"
-
-    if target.exists() and not force:
-        raise ConfigError(f"Host config already exists: {target} (use --force to overwrite)")
-
-    cfg = build_host_config(
-        host=host,
-        address=address,
-        retention=retention,
-        ssh_user=ssh_user,
-        ssh_port=ssh_port,
-        excludes_add=excludes_add,
-        excludes_replace=excludes_replace,
-        includes=includes,
-    )
-
-    action: str
-    if dry_run:
-        action = f"would write {target}"
-    else:
-        target.write_text(yaml.safe_dump(cfg, sort_keys=False), encoding="utf-8")
-        action = f"wrote {target}"
-
-    return {"ok": True, "action": action, "host_config": str(target)}
-

src/pobsync/commands/install.py

@@ -1,129 +0,0 @@
-from __future__ import annotations
-
-from pathlib import Path
-from typing import Any
-
-import yaml
-
-from ..errors import InstallError
-from ..paths import PobsyncPaths
-from ..util import ensure_dir, is_absolute_non_root
-
-
-DEFAULT_EXCLUDES = [
-    "/proc/***",
-    "/sys/***",
-    "/dev/***",
-    "/run/***",
-    "/tmp/***",
-    "/mnt/***",
-    "/media/***",
-    "/lost+found/***",
-    "/var/cache/***",
-    "/var/tmp/***",
-    "/var/run/***",
-    "/var/lock/***",
-    "/swapfile",
-    "/.snapshots/***",
-]
-
-DEFAULT_RSYNC_ARGS = [
-    "--archive",
-    "--numeric-ids",
-    "--delete",
-    "--delete-excluded",
-    "--partial",
-    "--partial-dir=.rsync-partial",
-    "--one-file-system",
-    "--relative",
-    "--human-readable",
-    "--stats",
-]
-
-
-def build_default_global_config(pobsync_home: Path, backup_root: str, retention: dict[str, int]) -> dict[str, Any]:
-    return {
-        "backup_root": backup_root,
-        "pobsync_home": str(pobsync_home),
-        "ssh": {
-            "user": "root",
-            "port": 22,
-            "options": [
-                "-oBatchMode=yes",
-                "-oStrictHostKeyChecking=accept-new",
-            ],
-        },
-        "rsync": {
-            "binary": "rsync",
-            "args": DEFAULT_RSYNC_ARGS,
-            "timeout_seconds": 0,
-            "bwlimit_kbps": 0,
-            "extra_args": [],
-        },
-        "defaults": {
-            "source_root": "/",
-            "destination_subdir": "",
-        },
-        "excludes_default": DEFAULT_EXCLUDES,
-        "logging": {
-            "file": str(pobsync_home / "logs" / "pobsync.log"),
-            "level": "INFO",
-        },
-        "output": {
-            "default_format": "human",
-        },
-        # We store default retention here for init-host convenience; host config still requires retention.
-        "retention_defaults": retention,
-    }
-
-
-def install_layout(paths: PobsyncPaths, dry_run: bool) -> list[str]:
-    actions: list[str] = []
-    for d in (paths.home, paths.config_dir, paths.hosts_dir, paths.state_dir, paths.locks_dir, paths.logs_dir):
-        actions.append(f"mkdir -p {d}")
-        if not dry_run:
-            ensure_dir(d)
-    return actions
-
-
-def write_yaml(path: Path, data: dict[str, Any], dry_run: bool, force: bool) -> str:
-    if path.exists() and not force:
-        return f"skip existing {path}"
-    if path.exists() and force:
-        bak = path.with_suffix(path.suffix + ".bak")
-        if not dry_run:
-            bak.write_text(path.read_text(encoding="utf-8"), encoding="utf-8")
-        return f"overwrite {path} (backup {bak})"
-    if not dry_run:
-        path.write_text(yaml.safe_dump(data, sort_keys=False), encoding="utf-8")
-    return f"write {path}"
-
-
-def run_install(
-    prefix: Path,
-    backup_root: str | None,
-    retention: dict[str, int],
-    dry_run: bool,
-    force: bool,
-) -> dict[str, Any]:
-    if backup_root is None:
-        raise InstallError("backup_root is required (use --backup-root or interactive mode)")
-    if not is_absolute_non_root(backup_root):
-        raise InstallError("backup_root must be an absolute path and must not be '/'")
-
-    paths = PobsyncPaths(home=prefix)
-
-    actions = install_layout(paths, dry_run=dry_run)
-
-    global_cfg = build_default_global_config(paths.home, backup_root=backup_root, retention=retention)
-    actions.append(write_yaml(paths.global_config_path, global_cfg, dry_run=dry_run, force=force))
-
-    return {
-        "ok": True,
-        "actions": actions,
-        "paths": {
-            "home": str(paths.home),
-            "global_config": str(paths.global_config_path),
-        },
-    }
-

src/pobsync/commands/list_remotes.py

@@ -1,24 +0,0 @@
-from __future__ import annotations
-
-from pathlib import Path
-
-from ..paths import PobsyncPaths
-from ..util import sanitize_host
-
-
-def run_list_remotes(prefix: Path) -> dict:
-    paths = PobsyncPaths(home=prefix)
-
-    hosts: list[str] = []
-    if paths.hosts_dir.exists():
-        for p in sorted(paths.hosts_dir.glob("*.yaml")):
-            host = p.stem
-            try:
-                sanitize_host(host)
-            except Exception:
-                # Ignore invalid filenames; doctor will catch config issues.
-                continue
-            hosts.append(host)
-
-    return {"ok": True, "hosts": hosts}
-

src/pobsync/commands/retention_apply.py

@@ -0,0 +1,110 @@
+from __future__ import annotations
+
+import shutil
+from pathlib import Path
+from typing import Any, Dict, List
+
+from ..config.source import ConfigSource
+from ..errors import ConfigError
+from ..lock import acquire_host_lock
+from ..paths import PobsyncPaths
+from ..util import sanitize_host
+from .retention_plan import run_retention_plan
+
+
+def run_retention_apply(
+    prefix: Path,
+    host: str,
+    kind: str,
+    protect_bases: bool,
+    yes: bool,
+    max_delete: int,
+    acquire_lock: bool = True,
+    config_source: ConfigSource | None = None,
+) -> dict[str, Any]:
+    host = sanitize_host(host)
+
+    if kind not in {"scheduled", "manual", "all"}:
+        raise ConfigError("kind must be scheduled, manual, or all")
+
+    if not yes:
+        raise ConfigError("Refusing to delete snapshots without --yes")
+
+    if max_delete < 0:
+        raise ConfigError("--max-delete must be >= 0")
+
+    paths = PobsyncPaths(home=prefix)
+
+    def _do_apply() -> dict[str, Any]:
+        plan = run_retention_plan(
+            prefix=prefix,
+            host=host,
+            kind=kind,
+            protect_bases=bool(protect_bases),
+            config_source=config_source,
+        )
+
+        delete_list = plan.get("delete") or []
+        if not isinstance(delete_list, list):
+            raise ConfigError("Invalid retention plan output: delete is not a list")
+
+        if max_delete == 0 and len(delete_list) > 0:
+            raise ConfigError("Deletion blocked by --max-delete=0")
+
+        if len(delete_list) > max_delete:
+            raise ConfigError(f"Refusing to delete {len(delete_list)} snapshots (exceeds --max-delete={max_delete})")
+
+        actions: List[str] = []
+        deleted: List[Dict[str, Any]] = []
+
+        for item in delete_list:
+            if not isinstance(item, dict):
+                continue
+
+            dirname = item.get("dirname")
+            snap_kind = item.get("kind")
+            snap_path = item.get("path")
+
+            if not isinstance(dirname, str) or not isinstance(snap_kind, str) or not isinstance(snap_path, str):
+                continue
+
+            # Hard safety: only allow scheduled/manual deletions from plan
+            if snap_kind not in {"scheduled", "manual"}:
+                raise ConfigError(f"Refusing to delete unsupported snapshot kind: {snap_kind!r}")
+
+            p = Path(snap_path)
+
+            if not p.exists():
+                actions.append(f"skip missing {snap_kind}/{dirname}")
+                continue
+
+            if not p.is_dir():
+                raise ConfigError(f"Refusing to delete non-directory path: {snap_path}")
+
+            shutil.rmtree(p)
+            actions.append(f"deleted {snap_kind} {dirname}")
+
+            deleted.append(
+                {
+                    "dirname": dirname,
+                    "kind": snap_kind,
+                    "path": snap_path,
+                }
+            )
+
+        return {
+            "ok": True,
+            "host": host,
+            "kind": kind,
+            "protect_bases": bool(protect_bases),
+            "max_delete": max_delete,
+            "deleted": deleted,
+            "actions": actions,
+        }
+
+    if acquire_lock:
+        with acquire_host_lock(paths.locks_dir, host, command="retention-apply"):
+            return _do_apply()
+
+    # Caller guarantees locking (used by run-scheduled)
+    return _do_apply()

src/pobsync/commands/retention_plan.py

@@ -0,0 +1,112 @@
+from __future__ import annotations
+
+from datetime import datetime, timezone
+from pathlib import Path
+from typing import Any, List
+
+from ..config.source import ConfigSource
+from ..errors import ConfigError
+from ..retention import Snapshot, apply_base_protection, build_retention_plan
+from ..snapshot_meta import iter_snapshot_dirs, read_snapshot_meta, resolve_host_root
+from ..util import sanitize_host
+
+
+def _parse_snapshot_dt(dirname: str, meta: dict) -> datetime:
+    ts = meta.get("started_at")
+    if isinstance(ts, str) and ts.endswith("Z"):
+        try:
+            return datetime.strptime(ts, "%Y-%m-%dT%H:%M:%SZ").replace(tzinfo=timezone.utc)
+        except ValueError:
+            pass
+
+    # fallback: dirname YYYYMMDD-HHMMSSZ__ID
+    try:
+        prefix = dirname.split("__", 1)[0]
+        return datetime.strptime(prefix, "%Y%m%d-%H%M%SZ").replace(tzinfo=timezone.utc)
+    except Exception:
+        return datetime.fromtimestamp(0, tz=timezone.utc)
+
+
+def run_retention_plan(
+    prefix: Path,
+    host: str,
+    kind: str,
+    protect_bases: bool,
+    config_source: ConfigSource | None = None,
+) -> dict[str, Any]:
+    host = sanitize_host(host)
+
+    if kind not in {"scheduled", "manual", "all"}:
+        raise ConfigError("kind must be scheduled, manual, or all")
+
+    if config_source is None:
+        raise ConfigError("A Django config source is required.")
+    cfg = config_source.effective_config_for_host(host)
+
+    retention = cfg.get("retention")
+    if not isinstance(retention, dict):
+        raise ConfigError("No retention config found")
+
+    backup_root = cfg.get("backup_root")
+    if not isinstance(backup_root, str) or not backup_root.startswith("/"):
+        raise ConfigError("Invalid backup_root in config")
+
+    host_root = resolve_host_root(backup_root, host)
+
+    kinds: List[str]
+    if kind == "all":
+        kinds = ["scheduled", "manual"]
+    else:
+        kinds = [kind]
+
+    snapshots: List[Snapshot] = []
+
+    for kk in kinds:
+        for d in iter_snapshot_dirs(host_root, kk):
+            meta = read_snapshot_meta(d)
+            dt = _parse_snapshot_dt(d.name, meta)
+
+            snapshots.append(
+                Snapshot(
+                    kind=kk,
+                    dirname=d.name,
+                    path=str(d),
+                    dt=dt,
+                    status=meta.get("status"),
+                    base=meta.get("base"),
+                )
+            )
+
+    plan = build_retention_plan(
+        snapshots=snapshots,
+        retention=retention,
+        now=datetime.now(timezone.utc),
+    )
+
+    keep = set(plan.keep)
+    reasons = dict(plan.reasons)
+
+    if protect_bases:
+        keep, reasons = apply_base_protection(snapshots=snapshots, keep=keep, reasons=reasons)
+
+    delete = [s for s in snapshots if s.dirname not in keep]
+
+    return {
+        "ok": True,
+        "host": host,
+        "kind": kind,
+        "protect_bases": bool(protect_bases),
+        "retention": retention,
+        "keep": sorted(keep),
+        "delete": [
+            {
+                "dirname": s.dirname,
+                "kind": s.kind,
+                "path": s.path,
+                "dt": s.dt.isoformat(),
+                "status": s.status,
+            }
+            for s in delete
+        ],
+        "reasons": reasons,
+    }

src/pobsync/commands/run_scheduled.py

@@ -1,14 +1,14 @@
 from __future__ import annotations
 
 from pathlib import Path
-from typing import Any
+from typing import Any, Callable
 
-from ..config.load import load_global_config, load_host_config
+from ..config.source import ConfigSource
-from ..config.merge import build_effective_config
 from ..errors import ConfigError
 from ..lock import acquire_host_lock
 from ..paths import PobsyncPaths
 from ..rsync import build_rsync_command, build_ssh_command, run_rsync
+from ..run_stats import collect_storage_stats, read_rsync_stats
 from ..snapshot import (
     HostBackupDirs,
     extract_ts_and_id_from_dirname,
@@ -18,9 +18,76 @@ from ..snapshot import (
     snapshot_dir_name,
     utc_now,
 )
+from ..snapshot_meta import read_snapshot_meta
 from ..util import ensure_dir, realpath_startswith, sanitize_host, write_yaml_atomic
 
 
+DEFAULT_DRY_RUN_TIMEOUT_SECONDS = 900
+
+
+def dry_run_log_path(host: str, run_id: int | None = None) -> Path:
+    host = sanitize_host(host)
+    run_dir = f"run-{run_id}" if run_id is not None else "adhoc"
+    return Path(f"/tmp/pobsync-dryrun/{host}/{run_dir}/rsync.log")
+
+
+def _read_log_tail(log_path: Path, *, max_lines: int = 40) -> list[str]:
+    try:
+        lines = log_path.read_text(encoding="utf-8", errors="replace").splitlines()
+    except OSError:
+        return []
+    return lines[-max_lines:]
+
+
+def classify_rsync_failure(exit_code: int | None, log_tail: list[str]) -> dict[str, str]:
+    joined_tail = "\n".join(log_tail).lower()
+    if exit_code == 255 and "broken pipe" in joined_tail:
+        return {
+            "category": "transport",
+            "message": "Rsync transport closed unexpectedly.",
+            "hint": "The SSH/rsync stream ended with a broken pipe. Check remote rsync availability, remote shell output, excludes, and connection stability.",
+        }
+    if exit_code == 255:
+        return {
+            "category": "transport",
+            "message": "Rsync transport failed.",
+            "hint": "Exit 255 usually comes from SSH or remote rsync startup. Check SSH access, known_hosts, remote rsync, and remote shell output.",
+        }
+    if exit_code == 124:
+        return {
+            "category": "timeout",
+            "message": "Rsync timed out.",
+            "hint": "Increase the rsync timeout or narrow the backup scope with source root, includes, or excludes.",
+        }
+    if "permission denied" in joined_tail:
+        return {
+            "category": "permissions",
+            "message": "Rsync hit a permission error.",
+            "hint": "Check the SSH user, key, and permissions on the remote source.",
+        }
+    return {
+        "category": "rsync",
+        "message": "Rsync failed.",
+        "hint": "Check the rsync log tail for the underlying error.",
+    }
+
+
+def _collect_run_stats(
+    *,
+    log_path: Path,
+    backup_root: Path,
+    duration_seconds: int | None = None,
+    snapshot_dir: Path | None = None,
+) -> dict[str, Any]:
+    stats: dict[str, Any] = {
+        "rsync": read_rsync_stats(log_path),
+        "storage": collect_storage_stats(backup_root=backup_root, snapshot_dir=snapshot_dir),
+    }
+    if duration_seconds is not None:
+        stats["duration_seconds"] = int(duration_seconds)
+    return stats
+
+
 def _host_backup_dirs(backup_root: str, host: str) -> HostBackupDirs:
     return HostBackupDirs(root=Path(backup_root) / host)
 
@@ -54,7 +121,13 @@ def select_scheduled_base(dirs: HostBackupDirs) -> Path | None:
     return _find_latest_snapshot(dirs.manual)
 
 
-def _base_meta_from_path(base_dir: Path | None) -> dict[str, Any] | None:
+def _base_meta_from_path(base_dir: Path | None, link_dest: str | None) -> dict[str, Any] | None:
+    """
+    Build base metadata for meta.yaml.
+
+    Important: link_dest is the actual rsync --link-dest directory.
+    For our snapshot layout, that must be "<snapshot_dir>/data".
+    """
     if base_dir is None:
         return None
 
@@ -63,22 +136,36 @@ def _base_meta_from_path(base_dir: Path | None) -> dict[str, Any] | None:
         # Should not happen with current selection logic, but keep meta robust.
         kind = "unknown"
 
+    base_meta = read_snapshot_meta(base_dir)
+    base_id = base_meta.get("id") if isinstance(base_meta.get("id"), str) else None
+
     return {
         "kind": kind,
         "dirname": base_dir.name,
-        "id": None,
+        "id": base_id,
-        "path": None,
+        "path": link_dest,
     }
 
 
-def run_scheduled(prefix: Path, host: str, dry_run: bool) -> dict[str, Any]:
+def run_scheduled(
+    prefix: Path,
+    host: str,
+    dry_run: bool,
+    prune: bool = False,
+    prune_max_delete: int | None = None,
+    prune_protect_bases: bool = False,
+    config_source: ConfigSource | None = None,
+    run_id: int | None = None,
+    cancel_check: Callable[[], bool] | None = None,
+    verbose_output: bool = False,
+) -> dict[str, Any]:
+
     host = sanitize_host(host)
     paths = PobsyncPaths(home=prefix)
 
-    # Load and merge config
+    if config_source is None:
-    global_cfg = load_global_config(paths.global_config_path)
+        raise ConfigError("A Django config source is required.")
-    host_cfg = load_host_config(paths.hosts_dir / f"{host}.yaml")
+    cfg = config_source.effective_config_for_host(host)
-    cfg = build_effective_config(global_cfg, host_cfg)
 
     backup_root = cfg.get("backup_root")
     if not isinstance(backup_root, str) or not backup_root.startswith("/"):
@@ -92,7 +179,10 @@ def run_scheduled(prefix: Path, host: str, dry_run: bool) -> dict[str, Any]:
 
     # Base snapshot (absolute path)
     base_dir = select_scheduled_base(dirs)
-    link_dest = str(base_dir) if base_dir else None
+
+    # BUGFIX: rsync --link-dest must point at the snapshot "data" root, not the snapshot dir itself.
+    # Our destination root is "<incomplete>/data/", so the base root must be "<base>/data/".
+    link_dest = str(base_dir / "data") if base_dir else None
 
     ssh_cfg = cfg.get("ssh", {}) or {}
     rsync_cfg = cfg.get("rsync", {}) or {}
@@ -122,8 +212,10 @@ def run_scheduled(prefix: Path, host: str, dry_run: bool) -> dict[str, Any]:
     # DRY RUN
     # ------------------------------------------------------------
     if dry_run:
-        dest = f"/tmp/pobsync-dryrun/{host}/"
+        dryrun_log = dry_run_log_path(host, run_id=run_id)
-        dryrun_log = Path(f"/tmp/pobsync-dryrun/{host}/rsync.log")
+        dest = str(dryrun_log.parent) + "/"
+        dryrun_log.unlink(missing_ok=True)
+        effective_timeout_seconds = timeout_seconds or DEFAULT_DRY_RUN_TIMEOUT_SECONDS
 
         cmd = build_rsync_command(
             rsync_binary=str(rsync_binary),
@@ -133,25 +225,44 @@ def run_scheduled(prefix: Path, host: str, dry_run: bool) -> dict[str, Any]:
             dest=dest,
             link_dest=link_dest,
             dry_run=True,
-            timeout_seconds=timeout_seconds,
+            timeout_seconds=effective_timeout_seconds,
             bwlimit_kbps=bwlimit_kbps,
             extra_excludes=list(excludes),
             extra_includes=list(includes),
         )
 
-        result = run_rsync(cmd, log_path=dryrun_log, timeout_seconds=timeout_seconds)
+        result = run_rsync(
+            cmd,
+            log_path=dryrun_log,
+            timeout_seconds=effective_timeout_seconds,
+            cancel_check=cancel_check,
+        )
+        log_tail = _read_log_tail(dryrun_log)
+        stats = _collect_run_stats(
+            log_path=dryrun_log,
+            backup_root=Path(backup_root),
+        )
 
-        return {
+        response = {
             "ok": result.exit_code == 0,
             "dry_run": True,
             "host": host,
             "base": str(base_dir) if base_dir else None,
             "log": str(dryrun_log),
+            "cancelled": result.cancelled,
+            "timeout_seconds": effective_timeout_seconds,
+            "verbose_output": True,
+            "ssh_credential": cfg.get("ssh_credential"),
+            "stats": stats,
             "rsync": {
                 "exit_code": result.exit_code,
                 "command": result.command,
+                "log_tail": log_tail,
             },
         }
+        if result.exit_code != 0:
+            response["failure"] = classify_rsync_failure(result.exit_code, log_tail)
+        return response
 
     # ------------------------------------------------------------
     # REAL RUN
@@ -190,6 +301,7 @@ def run_scheduled(prefix: Path, host: str, dry_run: bool) -> dict[str, Any]:
             bwlimit_kbps=bwlimit_kbps,
             extra_excludes=list(excludes),
             extra_includes=list(includes),
+            verbose_output=bool(verbose_output),
         )
 
         meta: dict[str, Any] = {
@@ -198,26 +310,31 @@ def run_scheduled(prefix: Path, host: str, dry_run: bool) -> dict[str, Any]:
             "host": host,
             "type": "scheduled",
             "label": None,
+            "verbose_output": bool(verbose_output),
             "status": "running",
             "started_at": format_iso_z(ts),
             "ended_at": None,
             "duration_seconds": None,
-            "base": _base_meta_from_path(base_dir),
+            "base": _base_meta_from_path(base_dir, link_dest),
             "rsync": {"exit_code": None, "command": cmd, "stats": {}},
-            # Keep existing fields for future expansion / compatibility with current structure.
             "overrides": {"includes": [], "excludes": [], "base": None},
         }
 
         log_path.touch(exist_ok=True)
         write_yaml_atomic(meta_path, meta)
 
-        result = run_rsync(cmd, log_path=log_path, timeout_seconds=timeout_seconds)
+        result = run_rsync(cmd, log_path=log_path, timeout_seconds=timeout_seconds, cancel_check=cancel_check)
 
         end_ts = utc_now()
         meta["ended_at"] = format_iso_z(end_ts)
         meta["duration_seconds"] = int((end_ts - ts).total_seconds())
         meta["rsync"]["exit_code"] = result.exit_code
-        meta["status"] = "success" if result.exit_code == 0 else "failed"
+        meta["status"] = "cancelled" if result.cancelled else ("success" if result.exit_code == 0 else "failed")
+        meta["stats"] = _collect_run_stats(
+            log_path=log_path,
+            backup_root=Path(backup_root),
+            duration_seconds=meta["duration_seconds"],
+        )
         write_yaml_atomic(meta_path, meta)
 
         if not log_path.exists():
@@ -233,17 +350,52 @@ def run_scheduled(prefix: Path, host: str, dry_run: bool) -> dict[str, Any]:
             }
 
         if result.exit_code != 0:
+            log_tail = _read_log_tail(log_path)
             return {
                 "ok": False,
                 "dry_run": False,
                 "host": host,
                 "snapshot": str(incomplete_dir),
                 "status": meta["status"],
-                "rsync": {"exit_code": result.exit_code},
+                "cancelled": result.cancelled,
+                "log": str(log_path),
+                "verbose_output": bool(verbose_output),
+                "ssh_credential": cfg.get("ssh_credential"),
+                "stats": meta["stats"],
+                "rsync": {
+                    "exit_code": result.exit_code,
+                    "command": result.command,
+                    "log_tail": log_tail,
+                },
+                "failure": classify_rsync_failure(result.exit_code, log_tail),
             }
 
         final_dir = dirs.scheduled / snap_name
         incomplete_dir.rename(final_dir)
+        final_log_path = final_dir / "meta" / "rsync.log"
+        final_meta_path = final_dir / "meta" / "meta.yaml"
+        meta["stats"] = _collect_run_stats(
+            log_path=final_log_path,
+            backup_root=Path(backup_root),
+            duration_seconds=meta["duration_seconds"],
+            snapshot_dir=final_dir / "data",
+        )
+        write_yaml_atomic(final_meta_path, meta)
+
+        prune_result = None
+        if prune:
+            from .retention_apply import run_retention_apply
+
+            prune_result = run_retention_apply(
+                prefix=paths.home,
+                host=host,
+                kind="scheduled",
+                protect_bases=bool(prune_protect_bases),
+                yes=True,
+                max_delete=10 if prune_max_delete is None else int(prune_max_delete),
+                acquire_lock=False,
+                config_source=source,
+            )
 
         return {
             "ok": True,
@@ -251,6 +403,10 @@ def run_scheduled(prefix: Path, host: str, dry_run: bool) -> dict[str, Any]:
             "host": host,
             "snapshot": str(final_dir),
             "base": str(base_dir) if base_dir else None,
+            "log": str(final_log_path),
             "rsync": {"exit_code": result.exit_code},
+            "verbose_output": bool(verbose_output),
+            "duration_seconds": meta["duration_seconds"],
+            "stats": meta["stats"],
+            "prune": prune_result,
         }
-

src/pobsync/commands/show_config.py

@@ -1,33 +0,0 @@
-from __future__ import annotations
-
-from pathlib import Path
-from typing import Any
-
-import yaml
-
-from ..config.load import load_global_config, load_host_config
-from ..config.merge import build_effective_config
-from ..paths import PobsyncPaths
-from ..util import sanitize_host
-
-
-def run_show_config(prefix: Path, host: str, effective: bool) -> dict[str, Any]:
-    host = sanitize_host(host)
-    paths = PobsyncPaths(home=prefix)
-
-    global_cfg = load_global_config(paths.global_config_path)
-    host_cfg = load_host_config(paths.hosts_dir / f"{host}.yaml")
-
-    cfg = build_effective_config(global_cfg, host_cfg) if effective else host_cfg
-
-    return {
-        "ok": True,
-        "host": host,
-        "effective": effective,
-        "config": cfg,
-    }
-
-
-def dump_yaml(data: Any) -> str:
-    return yaml.safe_dump(data, sort_keys=False)
-

src/pobsync/commands/snapshots_list.py

@@ -1,108 +0,0 @@
-from __future__ import annotations
-
-from datetime import datetime, timezone
-from pathlib import Path
-from typing import Any, Optional, Tuple
-
-from ..config.load import load_global_config, load_host_config
-from ..config.merge import build_effective_config
-from ..errors import ConfigError
-from ..paths import PobsyncPaths
-from ..snapshot_meta import iter_snapshot_dirs, normalize_kind, read_snapshot_meta, resolve_host_root
-from ..util import sanitize_host
-
-
-def _parse_iso_z(s: Any) -> Optional[datetime]:
-    """
-    Parse timestamps like '2026-02-02T22:38:07Z' into aware UTC datetime.
-    Returns None if invalid.
-    """
-    if not isinstance(s, str) or not s:
-        return None
-    # Strictly support trailing 'Z' (UTC) to avoid locale/timezone ambiguity.
-    if not s.endswith("Z"):
-        return None
-    try:
-        dt = datetime.strptime(s, "%Y-%m-%dT%H:%M:%SZ")
-        return dt.replace(tzinfo=timezone.utc)
-    except ValueError:
-        return None
-
-
-def _sort_key(item: dict[str, Any]) -> Tuple[int, datetime, str]:
-    """
-    Sort by:
-      1) Has started_at meta (1) before missing (0)
-      2) started_at descending
-      3) dirname descending (lexicographic)
-    """
-    dt = _parse_iso_z(item.get("started_at"))
-    has_dt = 1 if dt is not None else 0
-    # Use epoch for missing to keep key comparable; has_dt separates them anyway.
-    dt2 = dt if dt is not None else datetime.fromtimestamp(0, tz=timezone.utc)
-    dirname = item.get("dirname") or ""
-    return (has_dt, dt2, dirname)
-
-
-def run_snapshots_list(prefix: Path, host: str, kind: str, limit: int, include_incomplete: bool) -> dict[str, Any]:
-    host = sanitize_host(host)
-    k = normalize_kind(kind)
-
-    if limit < 1:
-        raise ConfigError("--limit must be >= 1")
-
-    paths = PobsyncPaths(home=prefix)
-
-    global_cfg = load_global_config(paths.global_config_path)
-    host_cfg = load_host_config(paths.hosts_dir / f"{host}.yaml")
-    cfg = build_effective_config(global_cfg, host_cfg)
-
-    backup_root = cfg.get("backup_root")
-    if not isinstance(backup_root, str) or not backup_root.startswith("/"):
-        raise ConfigError("Invalid backup_root in effective config")
-
-    host_root = resolve_host_root(backup_root, host)
-
-    kinds: list[str]
-    if k == "all":
-        kinds = ["scheduled", "manual"]
-        if include_incomplete:
-            kinds.append("incomplete")
-    else:
-        kinds = [k]
-
-    items: list[dict[str, Any]] = []
-
-    for kk in kinds:
-        for d in iter_snapshot_dirs(host_root, kk):
-            meta = read_snapshot_meta(d)
-
-            items.append(
-                {
-                    "kind": kk,
-                    "dirname": d.name,
-                    "path": str(d),
-                    "status": meta.get("status"),
-                    "started_at": meta.get("started_at"),
-                    "ended_at": meta.get("ended_at"),
-                    "duration_seconds": meta.get("duration_seconds"),
-                    "base": meta.get("base"),
-                    "id": meta.get("id"),
-                }
-            )
-
-    # Global sort: newest first
-    items.sort(key=_sort_key, reverse=True)
-
-    # Apply limit after sorting
-    out = items[:limit]
-
-    return {
-        "ok": True,
-        "host": host,
-        "kind": k,
-        "include_incomplete": bool(include_incomplete),
-        "limit": limit,
-        "snapshots": out,
-    }
-

src/pobsync/commands/snapshots_show.py

@@ -1,81 +0,0 @@
-from __future__ import annotations
-
-from pathlib import Path
-from typing import Any, List
-
-from ..config.load import load_global_config, load_host_config
-from ..config.merge import build_effective_config
-from ..errors import ConfigError
-from ..paths import PobsyncPaths
-from ..snapshot_meta import (
-    build_snapshot_ref,
-    normalize_kind,
-    read_snapshot_meta,
-    resolve_host_root,
-    snapshot_log_path,
-)
-from ..util import sanitize_host
-
-
-def _tail_lines(path: Path, n: int) -> List[str]:
-    """
-    Read last n lines of a text file.
-    Simple and safe; rsync logs are not huge in normal cases.
-    """
-    try:
-        lines = path.read_text(encoding="utf-8", errors="replace").splitlines()
-        return lines[-n:]
-    except OSError:
-        return []
-
-
-def run_snapshots_show(
-    prefix: Path,
-    host: str,
-    kind: str,
-    dirname: str,
-    tail: int | None,
-) -> dict[str, Any]:
-    host = sanitize_host(host)
-    k = normalize_kind(kind)
-    if k == "all":
-        raise ConfigError("kind must be scheduled, manual, or incomplete for show")
-
-    if tail is not None and tail < 1:
-        raise ConfigError("--tail must be >= 1")
-
-    paths = PobsyncPaths(home=prefix)
-
-    global_cfg = load_global_config(paths.global_config_path)
-    host_cfg = load_host_config(paths.hosts_dir / f"{host}.yaml")
-    cfg = build_effective_config(global_cfg, host_cfg)
-
-    backup_root = cfg.get("backup_root")
-    if not isinstance(backup_root, str) or not backup_root.startswith("/"):
-        raise ConfigError("Invalid backup_root in effective config")
-
-    host_root = resolve_host_root(backup_root, host)
-
-    ref = build_snapshot_ref(host=host, host_root=host_root, kind=k, dirname=dirname)
-    if not ref.path.exists():
-        raise ConfigError(f"Snapshot not found: {k}/{dirname}")
-
-    meta = read_snapshot_meta(ref.path)
-    log_path = snapshot_log_path(ref.path)
-
-    log_tail = None
-    if tail is not None and log_path.exists():
-        log_tail = _tail_lines(log_path, tail)
-
-    return {
-        "ok": True,
-        "host": host,
-        "kind": k,
-        "dirname": dirname,
-        "path": str(ref.path),
-        "meta_path": str(ref.path / "meta" / "meta.yaml"),
-        "log_path": str(log_path) if log_path.exists() else None,
-        "meta": meta,
-        "log_tail": log_tail,
-    }
-

src/pobsync/config/defaults.py

@@ -0,0 +1,32 @@
+from __future__ import annotations
+
+
+DEFAULT_EXCLUDES = [
+    "/proc/***",
+    "/sys/***",
+    "/dev/***",
+    "/run/***",
+    "/tmp/***",
+    "/mnt/***",
+    "/media/***",
+    "/lost+found/***",
+    "/var/cache/***",
+    "/var/tmp/***",
+    "/var/run/***",
+    "/var/lock/***",
+    "/swapfile",
+    "/.snapshots/***",
+]
+
+DEFAULT_RSYNC_ARGS = [
+    "--archive",
+    "--numeric-ids",
+    "--delete",
+    "--delete-excluded",
+    "--partial",
+    "--partial-dir=.rsync-partial",
+    "--one-file-system",
+    "--relative",
+    "--human-readable",
+    "--stats",
+]

src/pobsync/config/load.py

@@ -1,53 +0,0 @@
-from __future__ import annotations
-
-from pathlib import Path
-from typing import Any
-
-import yaml
-
-from ..errors import ConfigError, ValidationError
-from ..validate import validate_dict
-from .schemas import GLOBAL_SCHEMA, HOST_SCHEMA
-
-
-def load_yaml_file(path: Path) -> dict[str, Any]:
-    if not path.exists():
-        raise ConfigError(f"Missing config file: {path}")
-    try:
-        raw = path.read_text(encoding="utf-8")
-    except OSError as e:
-        raise ConfigError(f"Cannot read config file: {path}: {e}") from e
-
-    try:
-        data = yaml.safe_load(raw)
-    except yaml.YAMLError as e:
-        raise ConfigError(f"Invalid YAML in {path}: {e}") from e
-
-    if data is None:
-        data = {}
-    if not isinstance(data, dict):
-        raise ConfigError(f"Config root must be a mapping in {path}")
-    return data
-
-
-def load_global_config(path: Path) -> dict[str, Any]:
-    data = load_yaml_file(path)
-    try:
-        return validate_dict(data, GLOBAL_SCHEMA, path="global")
-    except ValidationError as e:
-        raise ConfigError(f"Invalid global config at {path}: {format_validation_error(e)}") from e
-
-
-def load_host_config(path: Path) -> dict[str, Any]:
-    data = load_yaml_file(path)
-    try:
-        return validate_dict(data, HOST_SCHEMA, path="host")
-    except ValidationError as e:
-        raise ConfigError(f"Invalid host config at {path}: {format_validation_error(e)}") from e
-
-
-def format_validation_error(err: ValidationError) -> str:
-    if err.path:
-        return f"{err.path}: {err}"
-    return str(err)
-

src/pobsync/config/retention.py

@@ -0,0 +1,21 @@
+from __future__ import annotations
+
+
+def parse_retention(s: str) -> dict[str, int]:
+    out: dict[str, int] = {}
+    parts = [p.strip() for p in s.split(",") if p.strip()]
+    for part in parts:
+        if "=" not in part:
+            raise ValueError(f"Invalid retention component: {part!r}")
+        k, v = part.split("=", 1)
+        k = k.strip()
+        v = v.strip()
+        if k not in {"daily", "weekly", "monthly", "yearly"}:
+            raise ValueError(f"Invalid retention key: {k!r}")
+        n = int(v)
+        if n < 0:
+            raise ValueError(f"Retention must be >= 0 for {k}")
+        out[k] = n
+    for k in ("daily", "weekly", "monthly", "yearly"):
+        out.setdefault(k, 0)
+    return out

src/pobsync/config/schemas.py

@@ -83,7 +83,6 @@ OUTPUT_SCHEMA = Schema(
 GLOBAL_SCHEMA = Schema(
     fields={
         "backup_root": FieldSpec(str, required=True),
-        "pobsync_home": FieldSpec(str, required=False, default="/opt/pobsync"),
         "ssh": FieldSpec(dict, required=False, schema=SSH_SCHEMA),
         "rsync": FieldSpec(dict, required=False, schema=RSYNC_SCHEMA),
         "defaults": FieldSpec(dict, required=False, schema=DEFAULTS_SCHEMA),
@@ -95,7 +94,6 @@ GLOBAL_SCHEMA = Schema(
         ),
         "logging": FieldSpec(dict, required=False, schema=LOGGING_SCHEMA),
         "output": FieldSpec(dict, required=False, schema=OUTPUT_SCHEMA),
-        # Used by `init-host` as a convenience default
         "retention_defaults": FieldSpec(
             dict,
             required=False,
@@ -131,4 +129,3 @@ HOST_SCHEMA = Schema(
     },
     allow_unknown=False,
 )
-

src/pobsync/config/source.py

@@ -0,0 +1,8 @@
+from __future__ import annotations
+
+from typing import Any, Protocol
+
+
+class ConfigSource(Protocol):
+    def effective_config_for_host(self, host: str) -> dict[str, Any]:
+        """Return the fully merged effective config for a host."""

src/pobsync/paths.py

@@ -8,14 +8,6 @@ from pathlib import Path
 class PobsyncPaths:
     home: Path  # usually /opt/pobsync
 
-    @property
-    def config_dir(self) -> Path:
-        return self.home / "config"
-
-    @property
-    def hosts_dir(self) -> Path:
-        return self.config_dir / "hosts"
-
     @property
     def state_dir(self) -> Path:
         return self.home / "state"
@@ -28,11 +20,6 @@ class PobsyncPaths:
     def logs_dir(self) -> Path:
         return self.home / "logs"
 
-    @property
-    def global_config_path(self) -> Path:
-        return self.config_dir / "global.yaml"
-
     @property
     def central_log_path(self) -> Path:
         return self.logs_dir / "pobsync.log"
-

src/pobsync/retention.py

@@ -0,0 +1,172 @@
+from __future__ import annotations
+
+from dataclasses import dataclass
+from datetime import datetime, timedelta, timezone
+from typing import Any, Dict, Iterable, List, Optional, Set, Tuple
+
+
+@dataclass(frozen=True)
+class Snapshot:
+    kind: str  # scheduled | manual
+    dirname: str
+    path: str
+    dt: datetime  # UTC
+    status: Optional[str]
+    base: Optional[dict]
+
+
+@dataclass
+class RetentionResult:
+    keep: Set[str]          # dirnames
+    reasons: Dict[str, List[str]]
+
+
+def _bucket_day(dt: datetime) -> str:
+    return dt.strftime("%Y-%m-%d")
+
+
+def _bucket_week(dt: datetime) -> str:
+    iso = dt.isocalendar()
+    return f"{iso.year}-W{iso.week:02d}"
+
+
+def _bucket_month(dt: datetime) -> str:
+    return dt.strftime("%Y-%m")
+
+
+def _bucket_year(dt: datetime) -> str:
+    return dt.strftime("%Y")
+
+
+def _window_start(now: datetime, unit: str, count: int) -> datetime:
+    if count <= 0:
+        return now + timedelta(days=1)
+
+    if unit == "daily":
+        return (now - timedelta(days=count - 1)).replace(hour=0, minute=0, second=0, microsecond=0)
+    if unit == "weekly":
+        return now - timedelta(weeks=count - 1)
+    if unit == "monthly":
+        return now.replace(day=1) - timedelta(days=32 * (count - 1))
+    if unit == "yearly":
+        return now.replace(month=1, day=1) - timedelta(days=366 * (count - 1))
+
+    raise ValueError(unit)
+
+
+def build_retention_plan(
+    snapshots: Iterable[Snapshot],
+    retention: Dict[str, int],
+    now: Optional[datetime] = None,
+) -> RetentionResult:
+    """
+    Build a dry-run retention plan.
+    Returns:
+      - keep: set of snapshot dirnames to keep
+      - reasons: mapping dirname -> list of reasons why it is kept
+    """
+    if now is None:
+        now = datetime.now(timezone.utc)
+
+    snaps = sorted(snapshots, key=lambda s: s.dt, reverse=True)
+
+    keep: Set[str] = set()
+    reasons: Dict[str, List[str]] = {}
+
+    def mark(dirname: str, reason: str) -> None:
+        keep.add(dirname)
+        reasons.setdefault(dirname, []).append(reason)
+
+    # Always keep newest snapshot overall (if any)
+    if snaps:
+        mark(snaps[0].dirname, "newest")
+
+    # Retention buckets
+    rules = [
+        ("daily", retention.get("daily", 0), _bucket_day),
+        ("weekly", retention.get("weekly", 0), _bucket_week),
+        ("monthly", retention.get("monthly", 0), _bucket_month),
+        ("yearly", retention.get("yearly", 0), _bucket_year),
+    ]
+
+    for name, count, bucket_fn in rules:
+        if count <= 0:
+            continue
+
+        window_start = _window_start(now, name, count)
+        seen: Set[str] = set()
+
+        for s in snaps:
+            if s.dt < window_start:
+                break
+
+            bucket = bucket_fn(s.dt)
+            if bucket in seen:
+                continue
+
+            # Prefer successful snapshots, but allow fallback
+            if s.status not in (None, "success"):
+                continue
+
+            seen.add(bucket)
+            mark(s.dirname, f"{name}:{bucket}")
+
+        # Fallback: if a bucket had no success, allow newest non-success
+        for s in snaps:
+            if s.dt < window_start:
+                break
+            bucket = bucket_fn(s.dt)
+            if bucket in seen:
+                continue
+            seen.add(bucket)
+            mark(s.dirname, f"{name}:{bucket}:fallback")
+
+    return RetentionResult(keep=keep, reasons=reasons)
+
+
+def apply_base_protection(
+    *,
+    snapshots: Iterable[Snapshot],
+    keep: Set[str],
+    reasons: Dict[str, List[str]],
+) -> Tuple[Set[str], Dict[str, List[str]]]:
+    """
+    If a kept snapshot has a base (kind+dirname), also keep that base snapshot.
+
+    Hardlink snapshots remain readable without this, but keeping bases can make
+    future base selection and chain inspection easier.
+    """
+    snapshot_list = list(snapshots)
+    index: Dict[Tuple[str, str], Snapshot] = {(snapshot.kind, snapshot.dirname): snapshot for snapshot in snapshot_list}
+
+    changed = True
+    while changed:
+        changed = False
+
+        for child_dirname in list(keep):
+            child = _find_snapshot_by_dirname(snapshot_list, child_dirname)
+            if child is None or not isinstance(child.base, dict):
+                continue
+
+            base_kind = child.base.get("kind")
+            base_dirname = child.base.get("dirname")
+            if not isinstance(base_kind, str) or not isinstance(base_dirname, str):
+                continue
+
+            base_snapshot = index.get((base_kind, base_dirname))
+            if base_snapshot is None or base_dirname in keep:
+                continue
+
+            keep.add(base_dirname)
+            reasons.setdefault(base_dirname, []).append(f"base-of:{child_dirname}")
+            changed = True
+
+    return keep, reasons
+
+
+def _find_snapshot_by_dirname(snapshots: Iterable[Snapshot], dirname: str) -> Snapshot | None:
+    for kind in ("scheduled", "manual"):
+        for snapshot in snapshots:
+            if snapshot.kind == kind and snapshot.dirname == dirname:
+                return snapshot
+    return None

src/pobsync/rsync.py

@@ -1,16 +1,23 @@
 from __future__ import annotations
 
+import os
+import signal
 import shlex
 import subprocess
+import time
 from dataclasses import dataclass
 from pathlib import Path
-from typing import Sequence
+from typing import Callable, Sequence
+
+
+DEFAULT_VERBOSE_OUTPUT_ARGS = ["--itemize-changes", "--info=flist2,progress2,stats2"]
 
 
 @dataclass(frozen=True)
 class RsyncResult:
     exit_code: int
     command: list[str]
+    cancelled: bool = False
 
 
 def build_ssh_command(ssh_cfg: dict) -> list[str]:
@@ -36,10 +43,14 @@ def build_rsync_command(
     bwlimit_kbps: int,
     extra_excludes: Sequence[str],
     extra_includes: Sequence[str],
+    verbose_output: bool = False,
 ) -> list[str]:
     cmd: list[str] = [rsync_binary]
 
     cmd.extend(list(rsync_args))
+    _append_stats_arg(cmd)
+    if dry_run or verbose_output:
+        _append_default_verbose_output_args(cmd)
 
     # includes/excludes: keep it simple for now:
     # - if includes are provided, user is responsible for correct rsync include logic.
@@ -66,7 +77,12 @@ def build_rsync_command(
 
 
 
-def run_rsync(command: list[str], log_path: Path, timeout_seconds: int) -> RsyncResult:
+def run_rsync(
+    command: list[str],
+    log_path: Path,
+    timeout_seconds: int,
+    cancel_check: Callable[[], bool] | None = None,
+) -> RsyncResult:
     """
     Run rsync and always write stdout/stderr to log_path.
 
@@ -77,17 +93,54 @@ def run_rsync(command: list[str], log_path: Path, timeout_seconds: int) -> Rsync
     # Ensure the file exists early.
     log_path.touch(exist_ok=True)
 
-    try:
-        with log_path.open("ab") as f:
-            p = subprocess.run(
-                command,
-                stdout=f,
-                stderr=subprocess.STDOUT,
-                timeout=timeout_seconds if timeout_seconds > 0 else None,
-            )
-        return RsyncResult(exit_code=p.returncode, command=command)
-    except subprocess.TimeoutExpired as e:
-        # Log timeout info and return a non-zero exit code.
     with log_path.open("ab") as f:
+        process = subprocess.Popen(command, stdout=f, stderr=subprocess.STDOUT, start_new_session=True)
+        started = time.monotonic()
+        while True:
+            exit_code = process.poll()
+            if exit_code is not None:
+                return RsyncResult(exit_code=exit_code, command=command)
+
+            if cancel_check is not None and cancel_check():
+                _terminate_process_group(process)
+                f.write(b"\n[pobsync] rsync cancelled\n")
+                return RsyncResult(exit_code=130, command=command, cancelled=True)
+
+            if timeout_seconds > 0 and time.monotonic() - started >= timeout_seconds:
+                _terminate_process_group(process)
                 f.write(b"\n[pobsync] rsync timed out\n")
                 return RsyncResult(exit_code=124, command=command)
+
+            time.sleep(1)
+
+
+def _terminate_process_group(process: subprocess.Popen) -> None:
+    try:
+        os.killpg(process.pid, signal.SIGTERM)
+        process.wait(timeout=10)
+    except ProcessLookupError:
+        return
+    except subprocess.TimeoutExpired:
+        os.killpg(process.pid, signal.SIGKILL)
+        process.wait(timeout=10)
+
+
+def _append_default_verbose_output_args(command: list[str]) -> None:
+    if not _has_itemize_arg(command):
+        command.append("--itemize-changes")
+    if not any(arg.startswith("--info=") for arg in command):
+        command.append("--info=flist2,progress2,stats2")
+
+
+def _append_stats_arg(command: list[str]) -> None:
+    if "--stats" not in command:
+        command.append("--stats")
+
+
+def _has_itemize_arg(command: list[str]) -> bool:
+    for arg in command:
+        if arg == "--itemize-changes":
+            return True
+        if arg.startswith("-") and not arg.startswith("--") and "i" in arg:
+            return True
+    return False

src/pobsync/run_stats.py

@@ -0,0 +1,238 @@
+from __future__ import annotations
+
+import os
+import re
+from pathlib import Path
+from typing import Any
+
+
+_COUNT_KEYS = {
+    "Number of files": "files_total",
+    "Number of created files": "files_created",
+    "Number of deleted files": "files_deleted",
+    "Number of regular files transferred": "files_transferred",
+}
+
+_BYTE_KEYS = {
+    "Total file size": "total_file_size_bytes",
+    "Total transferred file size": "total_transferred_file_size_bytes",
+    "Literal data": "literal_data_bytes",
+    "Matched data": "matched_data_bytes",
+    "File list size": "file_list_size_bytes",
+    "Total bytes sent": "bytes_sent",
+    "Total bytes received": "bytes_received",
+}
+
+_SIZE_UNITS = {
+    "": 1,
+    "b": 1,
+    "k": 1000,
+    "kb": 1000,
+    "m": 1000**2,
+    "mb": 1000**2,
+    "g": 1000**3,
+    "gb": 1000**3,
+    "t": 1000**4,
+    "tb": 1000**4,
+    "p": 1000**5,
+    "pb": 1000**5,
+}
+
+
+def parse_rsync_stats(text: str) -> dict[str, Any]:
+    stats: dict[str, Any] = {}
+    for raw_line in text.splitlines():
+        line = raw_line.strip()
+        if not line:
+            continue
+
+        _parse_colon_stat(line, stats)
+        _parse_sent_received(line, stats)
+        _parse_total_size_speedup(line, stats)
+
+    _add_derived_stats(stats)
+    return stats
+
+
+def read_rsync_stats(log_path: Path) -> dict[str, Any]:
+    try:
+        text = log_path.read_text(encoding="utf-8", errors="replace")
+    except OSError:
+        return {}
+    return parse_rsync_stats(text)
+
+
+def collect_storage_stats(*, backup_root: Path, snapshot_dir: Path | None = None) -> dict[str, Any]:
+    stats: dict[str, Any] = {
+        "backup_root": str(backup_root),
+    }
+    capacity = filesystem_capacity(backup_root)
+    if capacity:
+        stats["capacity"] = capacity
+
+    if snapshot_dir is not None:
+        snapshot_usage = tree_usage(snapshot_dir)
+        if snapshot_usage:
+            stats["snapshot"] = {
+                "path": str(snapshot_dir),
+                **snapshot_usage,
+            }
+
+    return stats
+
+
+def filesystem_capacity(path: Path) -> dict[str, Any]:
+    try:
+        stat = path.stat()
+        statvfs = os.statvfs(path)
+    except OSError:
+        return {}
+
+    total = int(statvfs.f_frsize * statvfs.f_blocks)
+    available = int(statvfs.f_frsize * statvfs.f_bavail)
+    free = int(statvfs.f_frsize * statvfs.f_bfree)
+    used = max(total - free, 0)
+    return {
+        "path": str(path),
+        "total_bytes": total,
+        "used_bytes": used,
+        "free_bytes": free,
+        "available_bytes": available,
+        "used_percent": round((used / total) * 100, 2) if total else 0.0,
+        "device": getattr(stat, "st_dev", None),
+    }
+
+
+def tree_usage(path: Path) -> dict[str, Any]:
+    apparent_size = 0
+    allocated_size = 0
+    files = 0
+    directories = 0
+    hardlinked_files = 0
+    hardlinked_apparent_size = 0
+    seen_allocated_inodes: set[tuple[int, int]] = set()
+
+    try:
+        root_stat = path.lstat()
+    except OSError:
+        return {}
+
+    if path.is_file():
+        files = 1
+        apparent_size = root_stat.st_size
+        allocated_size = int(getattr(root_stat, "st_blocks", 0) * 512)
+        if root_stat.st_nlink > 1:
+            hardlinked_files = 1
+            hardlinked_apparent_size = root_stat.st_size
+    else:
+        for current_root, dirnames, filenames in path.walk():
+            directories += len(dirnames)
+            for filename in filenames:
+                file_path = current_root / filename
+                try:
+                    file_stat = file_path.lstat()
+                except OSError:
+                    continue
+                files += 1
+                apparent_size += file_stat.st_size
+                inode_key = (file_stat.st_dev, file_stat.st_ino)
+                if inode_key not in seen_allocated_inodes:
+                    allocated_size += int(getattr(file_stat, "st_blocks", 0) * 512)
+                    seen_allocated_inodes.add(inode_key)
+                if file_stat.st_nlink > 1:
+                    hardlinked_files += 1
+                    hardlinked_apparent_size += file_stat.st_size
+
+    return {
+        "path": str(path),
+        "apparent_size_bytes": int(apparent_size),
+        "allocated_size_bytes": int(allocated_size),
+        "files": files,
+        "directories": directories,
+        "hardlinked_files": hardlinked_files,
+        "hardlinked_apparent_size_bytes": int(hardlinked_apparent_size),
+        "hardlink_apparent_ratio": round(hardlinked_apparent_size / apparent_size, 4) if apparent_size else 0.0,
+    }
+
+
+def _parse_colon_stat(line: str, stats: dict[str, Any]) -> None:
+    if ":" not in line:
+        return
+    label, value = line.split(":", 1)
+    label = label.strip()
+    value = value.strip()
+
+    if label in _COUNT_KEYS:
+        parsed = _parse_int_prefix(value)
+        if parsed is not None:
+            stats[_COUNT_KEYS[label]] = parsed
+    elif label in _BYTE_KEYS:
+        parsed = _parse_byte_value(value)
+        if parsed is not None:
+            stats[_BYTE_KEYS[label]] = parsed
+
+
+def _parse_sent_received(line: str, stats: dict[str, Any]) -> None:
+    match = re.search(
+        r"sent\s+(?P<sent>[\d,]+(?:\.\d+)?\s*[A-Za-z]*)\s+bytes\s+received\s+"
+        r"(?P<received>[\d,]+(?:\.\d+)?\s*[A-Za-z]*)\s+bytes\s+"
+        r"(?P<rate>[\d,]+(?:\.\d+)?\s*[A-Za-z]*)\s+bytes/sec",
+        line,
+    )
+    if not match:
+        return
+    sent = _parse_byte_value(match.group("sent"))
+    received = _parse_byte_value(match.group("received"))
+    rate = _parse_byte_value(match.group("rate"))
+    if sent is not None:
+        stats["bytes_sent"] = sent
+    if received is not None:
+        stats["bytes_received"] = received
+    if rate is not None:
+        stats["bytes_per_second"] = rate
+
+
+def _parse_total_size_speedup(line: str, stats: dict[str, Any]) -> None:
+    match = re.search(
+        r"total size is\s+(?P<size>[\d,]+(?:\.\d+)?\s*[A-Za-z]*)\s+speedup is\s+(?P<speedup>[\d,]+(?:\.\d+)?)",
+        line,
+    )
+    if not match:
+        return
+    total_size = _parse_byte_value(match.group("size"))
+    if total_size is not None:
+        stats["total_file_size_bytes"] = total_size
+    stats["speedup"] = float(match.group("speedup").replace(",", ""))
+
+
+def _add_derived_stats(stats: dict[str, Any]) -> None:
+    sent = stats.get("bytes_sent")
+    received = stats.get("bytes_received")
+    if isinstance(sent, int) and isinstance(received, int):
+        stats["bytes_sent_received"] = sent + received
+
+    literal = stats.get("literal_data_bytes")
+    matched = stats.get("matched_data_bytes")
+    if isinstance(literal, int) and isinstance(matched, int):
+        basis_total = literal + matched
+        stats["link_dest_estimated_savings_bytes"] = matched
+        stats["link_dest_estimated_savings_ratio"] = round(matched / basis_total, 4) if basis_total else 0.0
+
+
+def _parse_int_prefix(value: str) -> int | None:
+    match = re.match(r"([\d,]+)", value)
+    if not match:
+        return None
+    return int(match.group(1).replace(",", ""))
+
+
+def _parse_byte_value(value: str) -> int | None:
+    match = re.match(r"([\d,]+(?:\.\d+)?)\s*([A-Za-z]*)", value.strip())
+    if not match:
+        return None
+    number = float(match.group(1).replace(",", ""))
+    unit = match.group(2).lower()
+    multiplier = _SIZE_UNITS.get(unit)
+    if multiplier is None:
+        return int(number)
+    return int(number * multiplier)

src/pobsync/util.py

@@ -119,3 +119,57 @@ def write_yaml_atomic(path: Path, data: Any) -> None:
             except OSError:
                 pass
 
+
+def write_text_atomic(path: Path, content: str) -> None:
+    """
+    Write text to `path` atomically.
+
+    Strategy:
+    - Write to a temp file in the same directory
+    - fsync temp file
+    - os.replace(temp, path) (atomic on POSIX)
+    - fsync directory entry (best-effort)
+
+    This helps avoid partial/corrupt files on crashes.
+    """
+    parent = path.parent
+    parent.mkdir(parents=True, exist_ok=True)
+
+    tmp_fd: int | None = None
+    tmp_path: Path | None = None
+
+    try:
+        with tempfile.NamedTemporaryFile(
+            mode="w",
+            encoding="utf-8",
+            dir=str(parent),
+            prefix=path.name + ".",
+            suffix=".tmp",
+            delete=False,
+        ) as tf:
+            tmp_fd = tf.fileno()
+            tmp_path = Path(tf.name)
+            tf.write(content)
+            tf.flush()
+            os.fsync(tmp_fd)
+
+        os.replace(str(tmp_path), str(path))
+
+        # Best-effort directory fsync (helps durability across power loss on some FS)
+        try:
+            dir_fd = os.open(str(parent), os.O_DIRECTORY)
+            try:
+                os.fsync(dir_fd)
+            finally:
+                os.close(dir_fd)
+        except OSError:
+            pass
+
+    finally:
+        # If anything failed before replace(), try to clean up temp file
+        if tmp_path is not None and tmp_path.exists():
+            try:
+                tmp_path.unlink()
+            except OSError:
+                pass
+

src/pobsync_backend/__init__.py

@@ -0,0 +1 @@
+

src/pobsync_backend/admin.py

@@ -0,0 +1,196 @@
+from __future__ import annotations
+
+from django.contrib import admin
+from django.db.models import Count
+from django.urls import reverse
+from django.utils.html import format_html
+from django.utils.http import urlencode
+
+from .models import BackupRun, GlobalConfig, HostConfig, PurgedSnapshot, ScheduleConfig, SnapshotRecord, SshCredential
+
+
+@admin.register(SshCredential)
+class SshCredentialAdmin(admin.ModelAdmin):
+    list_display = ("name", "key_type", "generated", "has_public_key", "has_known_hosts", "updated_at")
+    readonly_fields = ("created_at", "updated_at", "fingerprint")
+    search_fields = ("name", "notes")
+    fieldsets = (
+        (None, {"fields": ("name", "key_type", "generated", "key_path", "fingerprint")}),
+        ("Key material", {"fields": ("private_key", "public_key", "known_hosts", "notes")}),
+        ("Timestamps", {"fields": ("created_at", "updated_at"), "classes": ("collapse",)}),
+    )
+
+    @admin.display(boolean=True, description="Public key")
+    def has_public_key(self, obj: SshCredential) -> bool:
+        return bool(obj.public_key.strip())
+
+    @admin.display(boolean=True, description="Known hosts")
+    def has_known_hosts(self, obj: SshCredential) -> bool:
+        return bool(obj.known_hosts.strip())
+
+
+@admin.register(GlobalConfig)
+class GlobalConfigAdmin(admin.ModelAdmin):
+    list_display = ("name", "backup_root", "ssh_user", "ssh_port", "updated_at")
+    readonly_fields = ("created_at", "updated_at")
+    fieldsets = (
+        (None, {"fields": ("name", "backup_root")}),
+        ("SSH", {"fields": ("default_ssh_credential", "ssh_user", "ssh_port", "ssh_options")}),
+        (
+            "Rsync",
+            {
+                "fields": (
+                    "rsync_binary",
+                    "rsync_args",
+                    "rsync_extra_args",
+                    "rsync_timeout_seconds",
+                    "rsync_bwlimit_kbps",
+                )
+            },
+        ),
+        ("Defaults", {"fields": ("default_source_root", "default_destination_subdir", "excludes_default")}),
+        ("Retention defaults", {"fields": ("retention_daily", "retention_weekly", "retention_monthly", "retention_yearly")}),
+        ("Timestamps", {"fields": ("created_at", "updated_at"), "classes": ("collapse",)}),
+    )
+
+
+@admin.register(HostConfig)
+class HostConfigAdmin(admin.ModelAdmin):
+    list_display = (
+        "host",
+        "address",
+        "enabled",
+        "schedule_state",
+        "snapshot_count_link",
+        "backup_run_count_link",
+        "latest_run_state",
+        "updated_at",
+    )
+    list_filter = ("enabled",)
+    search_fields = ("host", "address")
+    readonly_fields = ("created_at", "updated_at")
+    fieldsets = (
+        (None, {"fields": ("host", "address", "enabled")}),
+        ("SSH override", {"fields": ("ssh_credential", "ssh_user", "ssh_port")}),
+        ("Source", {"fields": ("source_root", "includes", "excludes_add", "excludes_replace")}),
+        ("Rsync override", {"fields": ("rsync_extra_args",)}),
+        ("Retention", {"fields": ("retention_daily", "retention_weekly", "retention_monthly", "retention_yearly")}),
+        ("Runtime state", {"fields": ("config",), "classes": ("collapse",)}),
+        ("Timestamps", {"fields": ("created_at", "updated_at"), "classes": ("collapse",)}),
+    )
+
+    def get_queryset(self, request):
+        return super().get_queryset(request).annotate(
+            snapshot_count=Count("snapshots", distinct=True),
+            backup_run_count=Count("runs", distinct=True),
+        )
+
+    @admin.display(description="Schedule")
+    def schedule_state(self, obj: HostConfig) -> str:
+        try:
+            schedule = obj.schedule
+        except ScheduleConfig.DoesNotExist:
+            return "none"
+        if not schedule.enabled:
+            return "disabled"
+        return schedule.cron_expr
+
+    @admin.display(description="Snapshots", ordering="snapshot_count")
+    def snapshot_count_link(self, obj: HostConfig) -> str:
+        count = getattr(obj, "snapshot_count", None)
+        if count is None:
+            count = obj.snapshots.count()
+        url = _admin_changelist_url("pobsync_backend", "snapshotrecord", {"host__id__exact": obj.pk})
+        return format_html('<a href="{}">{}</a>', url, count)
+
+    @admin.display(description="Runs", ordering="backup_run_count")
+    def backup_run_count_link(self, obj: HostConfig) -> str:
+        count = getattr(obj, "backup_run_count", None)
+        if count is None:
+            count = obj.runs.count()
+        url = _admin_changelist_url("pobsync_backend", "backuprun", {"host__id__exact": obj.pk})
+        return format_html('<a href="{}">{}</a>', url, count)
+
+    @admin.display(description="Latest run")
+    def latest_run_state(self, obj: HostConfig) -> str:
+        latest = obj.runs.order_by("-created_at").first()
+        if latest is None:
+            return "none"
+        return f"{latest.status} {latest.started_at:%Y-%m-%d %H:%M}" if latest.started_at else latest.status
+
+
+@admin.register(BackupRun)
+class BackupRunAdmin(admin.ModelAdmin):
+    list_display = ("host", "run_type", "status", "started_at", "ended_at", "snapshot_link")
+    list_filter = ("run_type", "status", "started_at")
+    search_fields = ("host__host", "snapshot_path", "snapshot__dirname", "snapshot__path")
+    autocomplete_fields = ("snapshot",)
+    list_select_related = ("host", "snapshot")
+    date_hierarchy = "started_at"
+
+    @admin.display(description="Snapshot", ordering="snapshot__dirname")
+    def snapshot_link(self, obj: BackupRun) -> str:
+        if obj.snapshot is None:
+            return ""
+        url = reverse("admin:pobsync_backend_snapshotrecord_change", args=[obj.snapshot.pk])
+        return format_html('<a href="{}">{}</a>', url, obj.snapshot.dirname)
+
+
+@admin.register(SnapshotRecord)
+class SnapshotRecordAdmin(admin.ModelAdmin):
+    list_display = ("host", "kind", "dirname", "status", "base_link", "backup_run_count_link", "started_at", "discovered_at")
+    list_filter = ("kind", "status", "base_kind", "started_at", "discovered_at")
+    search_fields = (
+        "host__host",
+        "dirname",
+        "path",
+        "base__dirname",
+        "base_path",
+        "base_snapshot_id",
+    )
+    autocomplete_fields = ("base",)
+    list_select_related = ("host", "base")
+    readonly_fields = ("discovered_at",)
+
+    def get_queryset(self, request):
+        return super().get_queryset(request).annotate(backup_run_count=Count("backup_runs"))
+
+    @admin.display(description="Base", ordering="base__dirname")
+    def base_link(self, obj: SnapshotRecord) -> str:
+        if obj.base is not None:
+            url = reverse("admin:pobsync_backend_snapshotrecord_change", args=[obj.base.pk])
+            return format_html('<a href="{}">{}</a>', url, obj.base.dirname)
+        if obj.base_dirname:
+            return obj.base_dirname
+        return ""
+
+    @admin.display(description="Runs", ordering="backup_run_count")
+    def backup_run_count_link(self, obj: SnapshotRecord) -> str:
+        count = getattr(obj, "backup_run_count", None)
+        if count is None:
+            count = obj.backup_runs.count()
+        url = _admin_changelist_url("pobsync_backend", "backuprun", {"snapshot__id__exact": obj.pk})
+        return format_html('<a href="{}">{}</a>', url, count)
+
+
+@admin.register(PurgedSnapshot)
+class PurgedSnapshotAdmin(admin.ModelAdmin):
+    list_display = ("host_name", "kind", "dirname", "action", "reason", "triggered_by", "purged_at")
+    list_filter = ("action", "kind", "purged_at")
+    search_fields = ("host_name", "dirname", "path", "reason", "triggered_by")
+    list_select_related = ("host",)
+    readonly_fields = ("purged_at",)
+    date_hierarchy = "purged_at"
+
+
+@admin.register(ScheduleConfig)
+class ScheduleConfigAdmin(admin.ModelAdmin):
+    list_display = ("host", "cron_expr", "enabled", "prune", "last_status", "last_started_at", "updated_at")
+    list_filter = ("enabled", "prune", "last_status")
+    search_fields = ("host__host", "cron_expr")
+    list_select_related = ("host",)
+
+
+def _admin_changelist_url(app_label: str, model_name: str, params: dict[str, object]) -> str:
+    base_url = reverse(f"admin:{app_label}_{model_name}_changelist")
+    return f"{base_url}?{urlencode(params)}"

src/pobsync_backend/api.py

@@ -0,0 +1,194 @@
+from __future__ import annotations
+
+from typing import Any
+
+from django.contrib.admin.views.decorators import staff_member_required
+from django.db import connection
+from django.db.models import Count
+from django.http import JsonResponse
+from django.utils import timezone
+
+from .models import BackupRun, HostConfig, ScheduleConfig, SnapshotRecord
+
+
+@staff_member_required
+def api_index(request) -> JsonResponse:
+    return JsonResponse(
+        {
+            "ok": True,
+            "endpoints": {
+                "status": request.build_absolute_uri("/api/status/"),
+                "hosts": request.build_absolute_uri("/api/hosts/"),
+                "snapshots": request.build_absolute_uri("/api/snapshots/"),
+                "runs": request.build_absolute_uri("/api/runs/"),
+            },
+        }
+    )
+
+
+@staff_member_required
+def status(request) -> JsonResponse:
+    latest_run = BackupRun.objects.select_related("host", "snapshot").order_by("-created_at").first()
+    latest_schedule = ScheduleConfig.objects.select_related("host").order_by("-last_started_at", "-updated_at").first()
+
+    return JsonResponse(
+        {
+            "ok": True,
+            "generated_at": timezone.now().isoformat(),
+            "database": {
+                "vendor": connection.vendor,
+                "engine": connection.settings_dict["ENGINE"],
+            },
+            "counts": {
+                "hosts": HostConfig.objects.count(),
+                "enabled_hosts": HostConfig.objects.filter(enabled=True).count(),
+                "schedules": ScheduleConfig.objects.count(),
+                "enabled_schedules": ScheduleConfig.objects.filter(enabled=True).count(),
+                "snapshots": SnapshotRecord.objects.count(),
+                "runs": BackupRun.objects.count(),
+                "running_runs": BackupRun.objects.filter(status=BackupRun.Status.RUNNING).count(),
+                "failed_runs": BackupRun.objects.filter(status=BackupRun.Status.FAILED).count(),
+            },
+            "latest_run": None if latest_run is None else _run_payload(latest_run),
+            "latest_schedule": None if latest_schedule is None else _schedule_payload(latest_schedule),
+        }
+    )
+
+
+@staff_member_required
+def hosts(request) -> JsonResponse:
+    host_qs = (
+        HostConfig.objects.annotate(snapshot_count=Count("snapshots", distinct=True), run_count=Count("runs", distinct=True))
+        .select_related("schedule")
+        .order_by("host")
+    )
+    return JsonResponse({"ok": True, "hosts": [_host_payload(host) for host in host_qs]})
+
+
+@staff_member_required
+def snapshots(request) -> JsonResponse:
+    snapshot_qs = SnapshotRecord.objects.select_related("host", "base").order_by("host__host", "-started_at", "dirname")
+    host_filter = request.GET.get("host")
+    kind_filter = request.GET.get("kind")
+    if host_filter:
+        snapshot_qs = snapshot_qs.filter(host__host=host_filter)
+    if kind_filter:
+        snapshot_qs = snapshot_qs.filter(kind=kind_filter)
+    limit = _limit_from_request(request)
+    return JsonResponse({"ok": True, "snapshots": [_snapshot_payload(snapshot) for snapshot in snapshot_qs[:limit]]})
+
+
+@staff_member_required
+def runs(request) -> JsonResponse:
+    run_qs = BackupRun.objects.select_related("host", "snapshot").order_by("-created_at")
+    host_filter = request.GET.get("host")
+    status_filter = request.GET.get("status")
+    if host_filter:
+        run_qs = run_qs.filter(host__host=host_filter)
+    if status_filter:
+        run_qs = run_qs.filter(status=status_filter)
+    limit = _limit_from_request(request)
+    return JsonResponse({"ok": True, "runs": [_run_payload(run) for run in run_qs[:limit]]})
+
+
+def _host_payload(host: HostConfig) -> dict[str, Any]:
+    try:
+        schedule = host.schedule
+    except ScheduleConfig.DoesNotExist:
+        schedule = None
+    return {
+        "host": host.host,
+        "address": host.address,
+        "enabled": host.enabled,
+        "snapshot_count": host.snapshot_count,
+        "run_count": host.run_count,
+        "retention": {
+            "daily": host.retention_daily,
+            "weekly": host.retention_weekly,
+            "monthly": host.retention_monthly,
+            "yearly": host.retention_yearly,
+        },
+        "schedule": None
+        if schedule is None
+        else _schedule_payload(schedule),
+    }
+
+
+def _snapshot_payload(snapshot: SnapshotRecord) -> dict[str, Any]:
+    return {
+        "host": snapshot.host.host,
+        "kind": snapshot.kind,
+        "dirname": snapshot.dirname,
+        "path": snapshot.path,
+        "status": snapshot.status,
+        "started_at": _iso(snapshot.started_at),
+        "ended_at": _iso(snapshot.ended_at),
+        "discovered_at": _iso(snapshot.discovered_at),
+        "base": _base_payload(snapshot),
+    }
+
+
+def _base_payload(snapshot: SnapshotRecord) -> dict[str, Any] | None:
+    if snapshot.base is not None:
+        return {
+            "kind": snapshot.base.kind,
+            "dirname": snapshot.base.dirname,
+            "path": snapshot.base.path,
+            "resolved": True,
+        }
+    if snapshot.base_kind and snapshot.base_dirname:
+        return {
+            "kind": snapshot.base_kind,
+            "dirname": snapshot.base_dirname,
+            "path": snapshot.base_path,
+            "snapshot_id": snapshot.base_snapshot_id,
+            "resolved": False,
+        }
+    return None
+
+
+def _run_payload(run: BackupRun) -> dict[str, Any]:
+    return {
+        "id": run.pk,
+        "host": run.host.host,
+        "run_type": run.run_type,
+        "status": run.status,
+        "started_at": _iso(run.started_at),
+        "ended_at": _iso(run.ended_at),
+        "snapshot": None
+        if run.snapshot is None
+        else {
+            "kind": run.snapshot.kind,
+            "dirname": run.snapshot.dirname,
+            "path": run.snapshot.path,
+        },
+        "snapshot_path": run.snapshot_path,
+        "base_path": run.base_path,
+        "rsync_exit_code": run.rsync_exit_code,
+    }
+
+
+def _schedule_payload(schedule: ScheduleConfig) -> dict[str, Any]:
+    return {
+        "host": schedule.host.host,
+        "cron_expr": schedule.cron_expr,
+        "enabled": schedule.enabled,
+        "prune": schedule.prune,
+        "last_due_key": schedule.last_due_key,
+        "last_status": schedule.last_status,
+        "last_started_at": _iso(schedule.last_started_at),
+        "last_finished_at": _iso(schedule.last_finished_at),
+    }
+
+
+def _limit_from_request(request, *, default: int = 100, maximum: int = 500) -> int:
+    value = request.GET.get("limit", str(default))
+    try:
+        limit = int(value)
+    except ValueError:
+        return default
+    return max(1, min(limit, maximum))
+
+
+def _iso(value) -> str | None:
+    return value.isoformat() if value is not None else None

src/pobsync_backend/apps.py

@@ -0,0 +1,9 @@
+from __future__ import annotations
+
+from django.apps import AppConfig
+
+
+class PobsyncBackendConfig(AppConfig):
+    default_auto_field = "django.db.models.BigAutoField"
+    name = "pobsync_backend"
+    verbose_name = "Pobsync backend"

src/pobsync_backend/backup_runner.py

@@ -0,0 +1,354 @@
+from __future__ import annotations
+
+import os
+import socket
+from datetime import timedelta, timezone as datetime_timezone
+from pathlib import Path
+
+from django.db import transaction
+from django.utils import timezone
+
+from pobsync.commands.run_scheduled import DEFAULT_DRY_RUN_TIMEOUT_SECONDS, classify_rsync_failure, dry_run_log_path, run_scheduled
+from pobsync_backend.config_source import DjangoConfigSource
+from pobsync_backend.models import BackupRun, HostConfig
+from pobsync_backend.retention import run_sql_retention_apply
+from pobsync_backend.snapshot_discovery import infer_snapshot_kind, upsert_snapshot_record
+
+
+def queue_backup_run(
+    *,
+    host: HostConfig,
+    run_type: str = BackupRun.RunType.MANUAL,
+    dry_run: bool = False,
+    verbose_output: bool = False,
+    prune: bool = False,
+    prune_max_delete: int = 10,
+    prune_protect_bases: bool = False,
+) -> BackupRun:
+    return BackupRun.objects.create(
+        host=host,
+        run_type=run_type,
+        status=BackupRun.Status.QUEUED,
+        result={
+            "requested": {
+                "dry_run": bool(dry_run),
+                "verbose_output": bool(dry_run or verbose_output),
+                "prune": bool(prune),
+                "prune_max_delete": int(prune_max_delete),
+                "prune_protect_bases": bool(prune_protect_bases),
+            }
+        },
+    )
+
+
+def execute_backup_run(
+    *,
+    run: BackupRun,
+    prefix: Path,
+    dry_run: bool = False,
+    verbose_output: bool = False,
+    prune: bool = False,
+    prune_max_delete: int = 10,
+    prune_protect_bases: bool = False,
+) -> BackupRun:
+    run.status = BackupRun.Status.RUNNING
+    run.started_at = run.started_at or timezone.now()
+    run.result = _running_result(run=run, dry_run=bool(dry_run))
+    run.save(update_fields=["status", "started_at", "result"])
+
+    try:
+        result = run_scheduled(
+            prefix=prefix,
+            host=run.host.host,
+            dry_run=bool(dry_run),
+            prune=False,
+            config_source=DjangoConfigSource(),
+            run_id=run.id,
+            cancel_check=lambda: _run_cancel_requested(run.id),
+            verbose_output=bool(dry_run or verbose_output),
+        )
+    except Exception as exc:
+        run.refresh_from_db()
+        run.status = BackupRun.Status.CANCELLED if run.status == BackupRun.Status.CANCELLED else BackupRun.Status.FAILED
+        run.ended_at = timezone.now()
+        run.result = {
+            **(run.result if isinstance(run.result, dict) else {}),
+            "ok": False,
+            "error": str(exc),
+            "type": type(exc).__name__,
+        }
+        run.save(update_fields=["status", "ended_at", "result"])
+        raise
+
+    run.refresh_from_db()
+    if result.get("cancelled") or run.status == BackupRun.Status.CANCELLED:
+        run.status = BackupRun.Status.CANCELLED
+    else:
+        run.status = BackupRun.Status.SUCCESS if result.get("ok") else BackupRun.Status.FAILED
+    run.ended_at = timezone.now()
+    run.snapshot_path = str(result.get("snapshot") or "")
+    run.base_path = str(result.get("base") or "")
+    rsync = result.get("rsync") if isinstance(result.get("rsync"), dict) else {}
+    run.rsync_exit_code = rsync.get("exit_code")
+    run.result = result
+    snapshot_record = None
+    if run.snapshot_path:
+        snapshot_path = Path(run.snapshot_path)
+        try:
+            kind = infer_snapshot_kind(snapshot_path)
+            snapshot_record, _created = upsert_snapshot_record(host=run.host, kind=kind, snapshot_dir=snapshot_path)
+        except ValueError:
+            snapshot_record = None
+
+    if result.get("ok") and not result.get("dry_run") and prune:
+        try:
+            result["prune"] = run_sql_retention_apply(
+                prefix=prefix,
+                host=run.host.host,
+                kind="scheduled",
+                protect_bases=bool(prune_protect_bases),
+                yes=True,
+                max_delete=int(prune_max_delete),
+                action=run.run_type,
+                acquire_lock=False,
+            )
+        except Exception as exc:
+            result["prune"] = {"ok": False, "error": str(exc), "type": type(exc).__name__}
+            run.status = BackupRun.Status.WARNING
+            run.result = result
+            run.snapshot = snapshot_record
+            run.save(
+                update_fields=[
+                    "status",
+                    "ended_at",
+                    "snapshot_path",
+                    "snapshot",
+                    "base_path",
+                    "rsync_exit_code",
+                    "result",
+                ],
+            )
+
+    run.snapshot = snapshot_record
+    run.result = result
+    run.save(
+        update_fields=[
+            "status",
+            "ended_at",
+            "snapshot_path",
+            "snapshot",
+            "base_path",
+            "rsync_exit_code",
+            "result",
+        ],
+    )
+    return run
+
+
+def claim_next_queued_run() -> BackupRun | None:
+    with transaction.atomic():
+        run = (
+            BackupRun.objects.select_related("host")
+            .filter(status=BackupRun.Status.QUEUED, host__enabled=True)
+            .order_by("created_at", "id")
+            .first()
+        )
+        if run is None:
+            return None
+        run.status = BackupRun.Status.RUNNING
+        run.started_at = timezone.now()
+        run.save(update_fields=["status", "started_at"])
+        return run
+
+
+def reconcile_running_runs(*, grace_seconds: int = 300, stale_worker_seconds: int = 24 * 60 * 60) -> int:
+    reconciled = 0
+    for run in BackupRun.objects.select_related("host").filter(status=BackupRun.Status.RUNNING).order_by("started_at", "id"):
+        if _reconcile_running_run(run=run, grace_seconds=grace_seconds, stale_worker_seconds=stale_worker_seconds):
+            reconciled += 1
+    return reconciled
+
+
+def requested_options(run: BackupRun) -> dict[str, object]:
+    requested = run.result.get("requested") if isinstance(run.result, dict) else None
+    if not isinstance(requested, dict):
+        return {}
+    return requested
+
+
+def _running_result(*, run: BackupRun, dry_run: bool) -> dict[str, object]:
+    result = dict(run.result) if isinstance(run.result, dict) else {}
+    execution = {
+        **_worker_execution_details(),
+        "started_at": (run.started_at or timezone.now()).isoformat(),
+        "heartbeat_at": timezone.now().isoformat(),
+    }
+    if dry_run:
+        execution["log"] = str(dry_run_log_path(run.host.host, run_id=run.id))
+    result["execution"] = execution
+    return result
+
+
+def _run_cancel_requested(run_id: int) -> bool:
+    try:
+        run = BackupRun.objects.only("id", "status", "result").get(id=run_id)
+    except BackupRun.DoesNotExist:
+        return True
+    if run.status == BackupRun.Status.CANCELLED:
+        return True
+    if run.status == BackupRun.Status.RUNNING:
+        _refresh_run_heartbeat(run)
+    return False
+
+
+def _reconcile_running_run(*, run: BackupRun, grace_seconds: int, stale_worker_seconds: int) -> bool:
+    result = run.result if isinstance(run.result, dict) else {}
+    requested = result.get("requested") if isinstance(result.get("requested"), dict) else {}
+    stale_worker = _running_worker_timed_out(run=run, stale_worker_seconds=stale_worker_seconds)
+    if not requested.get("dry_run"):
+        if stale_worker:
+            result.update(
+                {
+                    "ok": False,
+                    "host": run.host.host,
+                    "failure": {
+                        "category": "worker",
+                        "message": "The worker heartbeat stopped before the run finished.",
+                        "hint": "Check pobsync-worker.service logs before retrying the backup.",
+                    },
+                }
+            )
+            run.status = BackupRun.Status.FAILED
+            run.ended_at = timezone.now()
+            run.result = result
+            run.save(update_fields=["status", "ended_at", "result"])
+            return True
+        return False
+
+    log_path = _execution_log_path(result)
+    log_tail = _read_log_tail(log_path) if log_path is not None else []
+    terminal_log = _terminal_rsync_log(log_tail)
+    timed_out = _running_dry_run_timed_out(run=run, grace_seconds=grace_seconds)
+    if not terminal_log and not timed_out and not stale_worker:
+        return False
+
+    exit_code = _exit_code_from_log(log_tail) or (124 if timed_out or stale_worker else 255)
+    failure = classify_rsync_failure(exit_code, log_tail)
+    if stale_worker and not terminal_log:
+        failure = {
+            "category": "worker",
+            "message": "The worker heartbeat stopped before the dry-run finished.",
+            "hint": "Check pobsync-worker.service logs before retrying the dry-run.",
+        }
+    result.update(
+        {
+            "ok": False,
+            "dry_run": True,
+            "host": run.host.host,
+            "base": result.get("base"),
+            "log": str(log_path) if log_path else "",
+            "failure": failure,
+            "rsync": {
+                **(result.get("rsync") if isinstance(result.get("rsync"), dict) else {}),
+                "exit_code": exit_code,
+                "log_tail": log_tail,
+            },
+        }
+    )
+    run.status = BackupRun.Status.FAILED
+    run.ended_at = timezone.now()
+    run.rsync_exit_code = exit_code
+    run.result = result
+    run.save(update_fields=["status", "ended_at", "rsync_exit_code", "result"])
+    return True
+
+
+def _worker_execution_details() -> dict[str, object]:
+    return {
+        "worker_pid": os.getpid(),
+        "worker_host": socket.gethostname(),
+        "claimed_at": timezone.now().isoformat(),
+    }
+
+
+def _refresh_run_heartbeat(run: BackupRun, *, interval_seconds: int = 30) -> None:
+    result = run.result if isinstance(run.result, dict) else {}
+    execution = result.get("execution") if isinstance(result.get("execution"), dict) else {}
+    heartbeat_at = _parse_iso_datetime(execution.get("heartbeat_at"))
+    if heartbeat_at is not None and timezone.now() < heartbeat_at + timedelta(seconds=interval_seconds):
+        return
+    result["execution"] = {
+        **execution,
+        "worker_pid": os.getpid(),
+        "worker_host": socket.gethostname(),
+        "heartbeat_at": timezone.now().isoformat(),
+    }
+    run.result = result
+    run.save(update_fields=["result"])
+
+
+def _execution_log_path(result: dict[str, object]) -> Path | None:
+    execution = result.get("execution") if isinstance(result.get("execution"), dict) else {}
+    log = execution.get("log") or result.get("log")
+    if not isinstance(log, str) or not log:
+        return None
+    return Path(log)
+
+
+def _read_log_tail(log_path: Path | None, *, max_lines: int = 40) -> list[str]:
+    if log_path is None:
+        return []
+    try:
+        return log_path.read_text(encoding="utf-8", errors="replace").splitlines()[-max_lines:]
+    except OSError:
+        return []
+
+
+def _terminal_rsync_log(log_tail: list[str]) -> bool:
+    return any(line.startswith("rsync error:") for line in log_tail)
+
+
+def _exit_code_from_log(log_tail: list[str]) -> int | None:
+    for line in reversed(log_tail):
+        if "code 255" in line:
+            return 255
+        if "code 124" in line:
+            return 124
+        if "code 12" in line:
+            return 12
+    return None
+
+
+def _running_dry_run_timed_out(*, run: BackupRun, grace_seconds: int) -> bool:
+    if run.started_at is None:
+        return False
+    result = run.result if isinstance(run.result, dict) else {}
+    timeout_seconds = result.get("timeout_seconds")
+    if not isinstance(timeout_seconds, int) or timeout_seconds <= 0:
+        timeout_seconds = DEFAULT_DRY_RUN_TIMEOUT_SECONDS
+    return timezone.now() >= run.started_at + timedelta(seconds=timeout_seconds + grace_seconds)
+
+
+def _running_worker_timed_out(*, run: BackupRun, stale_worker_seconds: int) -> bool:
+    if stale_worker_seconds <= 0:
+        return False
+    result = run.result if isinstance(run.result, dict) else {}
+    execution = result.get("execution") if isinstance(result.get("execution"), dict) else {}
+    heartbeat_at = _parse_iso_datetime(execution.get("heartbeat_at"))
+    if heartbeat_at is None:
+        heartbeat_at = run.started_at
+    if heartbeat_at is None:
+        return False
+    return timezone.now() >= heartbeat_at + timedelta(seconds=stale_worker_seconds)
+
+
+def _parse_iso_datetime(value: object):
+    if not isinstance(value, str) or not value:
+        return None
+    try:
+        parsed = timezone.datetime.fromisoformat(value)
+    except ValueError:
+        return None
+    if timezone.is_naive(parsed):
+        return timezone.make_aware(parsed, timezone=datetime_timezone.utc)
+    return parsed

src/pobsync_backend/config_checks.py

@@ -0,0 +1,201 @@
+from __future__ import annotations
+
+import os
+import shutil
+from pathlib import Path
+
+from django.conf import settings
+
+from .models import GlobalConfig, HostConfig, SshCredential
+from .self_check import SelfCheck
+from .ssh_keys import identity_path
+
+
+CRITICAL_ROOT_EXCLUDES = ("/proc/***", "/sys/***", "/dev/***", "/run/***", "/tmp/***")
+
+
+def collect_global_config_checks(global_config: GlobalConfig) -> list[SelfCheck]:
+    checks = [
+        _absolute_path_check("Global backup root", global_config.backup_root),
+        _absolute_path_check("Runtime state root", settings.POBSYNC_HOME),
+        _runtime_backup_root_check(global_config),
+        _rsync_binary_check(global_config.rsync_binary),
+        _rsync_recursion_check(
+            "Global rsync recursion",
+            [*list(global_config.rsync_args or []), *list(global_config.rsync_extra_args or [])],
+        ),
+        _source_root_check("Global source root", global_config.default_source_root),
+        _root_excludes_check(global_config.default_source_root, list(global_config.excludes_default or [])),
+        _retention_check(
+            "Global retention",
+            global_config.retention_daily,
+            global_config.retention_weekly,
+            global_config.retention_monthly,
+            global_config.retention_yearly,
+        ),
+        _ssh_port_check("Global SSH port", global_config.ssh_port),
+        _credential_check("Global SSH credential", global_config.default_ssh_credential),
+    ]
+    return checks
+
+
+def collect_effective_host_config_checks(host: HostConfig, global_config: GlobalConfig) -> list[SelfCheck]:
+    source_root = host.source_root or global_config.default_source_root
+    ssh_user = host.ssh_user or global_config.ssh_user
+    ssh_port = host.ssh_port or global_config.ssh_port
+    credential = host.ssh_credential or global_config.default_ssh_credential
+    if host.excludes_replace is not None:
+        excludes = list(host.excludes_replace)
+    else:
+        excludes = [*list(global_config.excludes_default or []), *list(host.excludes_add or [])]
+    rsync_args = [
+        *list(global_config.rsync_args or []),
+        *list(global_config.rsync_extra_args or []),
+        *list(host.rsync_extra_args or []),
+    ]
+
+    checks = [
+        _source_root_check("Host effective source root", source_root),
+        _ssh_user_check(ssh_user),
+        _ssh_port_check("Host effective SSH port", ssh_port),
+        _credential_check("Host effective SSH credential", credential),
+        _rsync_recursion_check("Host effective rsync recursion", rsync_args),
+        _root_excludes_check(source_root, excludes, host=host),
+        _includes_check(host),
+        _retention_check(
+            "Host retention",
+            host.retention_daily,
+            host.retention_weekly,
+            host.retention_monthly,
+            host.retention_yearly,
+        ),
+    ]
+    return checks
+
+
+def has_recursive_rsync_arg(args: list[str]) -> bool:
+    for arg in args:
+        if arg in {"--archive", "--recursive"}:
+            return True
+        if arg.startswith("-") and not arg.startswith("--") and any(flag in arg for flag in ("a", "r")):
+            return True
+    return False
+
+
+def _absolute_path_check(name: str, value: str) -> SelfCheck:
+    path = Path(value)
+    if not value:
+        return SelfCheck(name, "failed", "Path is empty.")
+    if not path.is_absolute():
+        return SelfCheck(name, "failed", f"{value} is not absolute.")
+    return SelfCheck(name, "ok", value)
+
+
+def _runtime_backup_root_check(global_config: GlobalConfig) -> SelfCheck:
+    if global_config.backup_root == settings.POBSYNC_BACKUP_ROOT:
+        return SelfCheck("Runtime backup root", "ok", global_config.backup_root)
+    return SelfCheck(
+        "Runtime backup root",
+        "warning",
+        "Database backup root differs from the runtime backup root.",
+        f"database={global_config.backup_root} runtime={settings.POBSYNC_BACKUP_ROOT}",
+    )
+
+
+def _rsync_binary_check(binary: str) -> SelfCheck:
+    if not binary:
+        return SelfCheck("Global rsync binary", "failed", "Rsync binary is empty.")
+    if Path(binary).is_absolute():
+        exists = Path(binary).exists()
+        message = binary if exists else f"{binary} does not exist."
+        return SelfCheck("Global rsync binary", "ok" if exists else "failed", message)
+    path = shutil.which(binary)
+    return SelfCheck("Global rsync binary", "ok" if path else "failed", path or f"{binary} was not found in PATH.")
+
+
+def _rsync_recursion_check(name: str, args: list[str]) -> SelfCheck:
+    if has_recursive_rsync_arg(args):
+        return SelfCheck(name, "ok", "Rsync args include archive or recursive transfer.", " ".join(args))
+    return SelfCheck(
+        name,
+        "failed",
+        "Rsync args do not include archive or recursive transfer.",
+        "Add --archive or --recursive before running a real backup.",
+    )
+
+
+def _source_root_check(name: str, source_root: str) -> SelfCheck:
+    if not source_root:
+        return SelfCheck(name, "failed", "Source root is empty.")
+    if not source_root.startswith("/"):
+        return SelfCheck(name, "failed", f"{source_root} is not absolute.")
+    return SelfCheck(name, "ok", source_root)
+
+
+def _root_excludes_check(source_root: str, excludes: list[str], host: HostConfig | None = None) -> SelfCheck:
+    if source_root != "/":
+        return SelfCheck("Effective root excludes", "ok", "Source root is not /, critical OS excludes are less important.")
+    missing = [pattern for pattern in CRITICAL_ROOT_EXCLUDES if pattern not in excludes]
+    if missing:
+        detail = ", ".join(missing)
+        if host and host.excludes_replace is not None:
+            detail = f"excludes_replace is active; missing {detail}"
+        return SelfCheck(
+            "Effective root excludes",
+            "warning",
+            "Source root is / but some critical default excludes are missing.",
+            detail,
+        )
+    return SelfCheck("Effective root excludes", "ok", "Critical root excludes are present.")
+
+
+def _includes_check(host: HostConfig) -> SelfCheck:
+    includes = list(host.includes or [])
+    if not includes:
+        return SelfCheck("Host includes", "ok", "No host include rules are configured.")
+    return SelfCheck(
+        "Host includes",
+        "warning",
+        "Includes are passed to rsync as raw --include rules.",
+        "Verify matching exclude rules if you intend to limit the backup scope.",
+    )
+
+
+def _retention_check(name: str, daily: int, weekly: int, monthly: int, yearly: int) -> SelfCheck:
+    if any(value > 0 for value in (daily, weekly, monthly, yearly)):
+        return SelfCheck(name, "ok", f"d{daily} w{weekly} m{monthly} y{yearly}")
+    return SelfCheck(name, "warning", "All retention windows are zero.")
+
+
+def _ssh_user_check(user: str) -> SelfCheck:
+    if user.strip():
+        return SelfCheck("Host effective SSH user", "ok", user.strip())
+    return SelfCheck("Host effective SSH user", "failed", "SSH user is empty.")
+
+
+def _ssh_port_check(name: str, port: int | None) -> SelfCheck:
+    if port is None:
+        return SelfCheck(name, "failed", "SSH port is empty.")
+    if 1 <= int(port) <= 65535:
+        return SelfCheck(name, "ok", str(port))
+    return SelfCheck(name, "failed", f"{port} is outside the valid TCP port range.")
+
+
+def _credential_check(name: str, credential: SshCredential | None) -> SelfCheck:
+    if credential is None:
+        return SelfCheck(name, "warning", "No SSH credential selected.")
+    if credential.key_path:
+        key_path = identity_path(credential)
+        if not key_path.exists():
+            return SelfCheck(name, "failed", f"{key_path} does not exist.")
+        if not os.access(key_path, os.R_OK):
+            return SelfCheck(name, "failed", f"{key_path} is not readable by this process.")
+        return SelfCheck(name, "ok", str(credential), str(key_path))
+    if credential.private_key:
+        return SelfCheck(
+            name,
+            "warning",
+            f"{credential} stores private key material in the database.",
+            "Generated filesystem keys are recommended for native installs.",
+        )
+    return SelfCheck(name, "failed", f"{credential} has no private key material or key path.")

src/pobsync_backend/config_repository.py

@@ -0,0 +1,97 @@
+from __future__ import annotations
+
+from typing import Any
+
+from django.core.exceptions import ObjectDoesNotExist
+
+from pobsync.config.schemas import GLOBAL_SCHEMA, HOST_SCHEMA
+from pobsync.validate import validate_dict
+
+from .models import GlobalConfig, HostConfig
+
+
+class ConfigRepositoryError(RuntimeError):
+    pass
+
+
+def _global_runtime_data(global_config: GlobalConfig) -> dict[str, Any]:
+    data = {
+        "backup_root": global_config.backup_root,
+        "ssh": {
+            "user": global_config.ssh_user,
+            "port": global_config.ssh_port,
+            "options": list(global_config.ssh_options or []),
+        },
+        "rsync": {
+            "binary": global_config.rsync_binary,
+            "args": list(global_config.rsync_args or []),
+            "timeout_seconds": global_config.rsync_timeout_seconds,
+            "bwlimit_kbps": global_config.rsync_bwlimit_kbps,
+            "extra_args": list(global_config.rsync_extra_args or []),
+        },
+        "defaults": {
+            "source_root": global_config.default_source_root,
+            "destination_subdir": global_config.default_destination_subdir,
+        },
+        "excludes_default": list(global_config.excludes_default or []),
+        "retention_defaults": {
+            "daily": global_config.retention_daily,
+            "weekly": global_config.retention_weekly,
+            "monthly": global_config.retention_monthly,
+            "yearly": global_config.retention_yearly,
+        },
+    }
+    return validate_dict(data, GLOBAL_SCHEMA, path="global")
+
+
+def _host_runtime_data(host_config: HostConfig) -> dict[str, Any]:
+    data: dict[str, Any] = {
+        "host": host_config.host,
+        "address": host_config.address,
+        "includes": list(host_config.includes or []),
+        "retention": {
+            "daily": host_config.retention_daily,
+            "weekly": host_config.retention_weekly,
+            "monthly": host_config.retention_monthly,
+            "yearly": host_config.retention_yearly,
+        },
+    }
+    if host_config.ssh_user or host_config.ssh_port:
+        data["ssh"] = {}
+        if host_config.ssh_user:
+            data["ssh"]["user"] = host_config.ssh_user
+        if host_config.ssh_port is not None:
+            data["ssh"]["port"] = host_config.ssh_port
+    if host_config.source_root:
+        data["source_root"] = host_config.source_root
+    if host_config.excludes_replace is not None:
+        data["excludes_replace"] = list(host_config.excludes_replace or [])
+    else:
+        data["excludes_add"] = list(host_config.excludes_add or [])
+    if host_config.rsync_extra_args:
+        data["rsync"] = {"extra_args": list(host_config.rsync_extra_args or [])}
+    return validate_dict(data, HOST_SCHEMA, path="host")
+
+
+def global_config_object_data(global_config: GlobalConfig) -> dict[str, Any]:
+    return _global_runtime_data(global_config)
+
+
+def host_config_object_data(host_config: HostConfig) -> dict[str, Any]:
+    return _host_runtime_data(host_config)
+
+
+def global_config_data(name: str = "default") -> dict[str, Any]:
+    try:
+        global_config = GlobalConfig.objects.get(name=name)
+    except ObjectDoesNotExist as exc:
+        raise ConfigRepositoryError(f"Missing global config {name!r}") from exc
+    return _global_runtime_data(global_config)
+
+
+def host_config_data(host: str) -> dict[str, Any]:
+    try:
+        host_config = HostConfig.objects.get(host=host, enabled=True)
+    except ObjectDoesNotExist as exc:
+        raise ConfigRepositoryError(f"Missing enabled host {host!r}") from exc
+    return _host_runtime_data(host_config)

src/pobsync_backend/config_source.py

@@ -0,0 +1,93 @@
+from __future__ import annotations
+
+import os
+from pathlib import Path
+from typing import Any
+
+from django.conf import settings
+
+from pobsync.config.merge import build_effective_config
+from pobsync.paths import PobsyncPaths
+
+from .config_repository import global_config_data, host_config_data
+from .models import GlobalConfig, HostConfig, SshCredential
+from .ssh_keys import identity_path
+
+
+class DjangoConfigSource:
+    def effective_config_for_host(self, host: str) -> dict[str, Any]:
+        config = build_effective_config(global_config_data(), host_config_data(host))
+        credential = _credential_for_host(host)
+        if credential is not None:
+            _attach_credential_options(config, credential)
+        return config
+
+
+def _credential_for_host(host: str) -> SshCredential | None:
+    host_config = HostConfig.objects.select_related("ssh_credential").get(host=host, enabled=True)
+    if host_config.ssh_credential_id:
+        return host_config.ssh_credential
+
+    global_config = GlobalConfig.objects.select_related("default_ssh_credential").get(name="default")
+    return global_config.default_ssh_credential
+
+
+def _attach_credential_options(config: dict[str, Any], credential: SshCredential) -> None:
+    ssh = config.setdefault("ssh", {})
+    options = list(ssh.get("options") or [])
+    paths = _materialize_credential(credential)
+    if not _has_ssh_option(options, "IdentityFile"):
+        options.append(f"-oIdentityFile={paths['identity_file']}")
+    if paths.get("known_hosts") and not _has_ssh_option(options, "UserKnownHostsFile"):
+        options.append(f"-oUserKnownHostsFile={paths['known_hosts']}")
+    if paths.get("accept_new_known_hosts"):
+        if not _has_ssh_option(options, "UserKnownHostsFile"):
+            options.append(f"-oUserKnownHostsFile={paths['accept_new_known_hosts']}")
+        if not _has_ssh_option(options, "StrictHostKeyChecking"):
+            options.append("-oStrictHostKeyChecking=accept-new")
+    ssh["options"] = options
+    config["ssh_credential"] = {
+        "id": credential.pk,
+        "name": credential.name,
+        "identity_file": paths["identity_file"],
+        "generated": credential.generated,
+        "storage": "filesystem" if credential.key_path else "database",
+    }
+
+
+def _materialize_credential(credential: SshCredential) -> dict[str, str]:
+    paths = PobsyncPaths(home=Path(settings.POBSYNC_HOME))
+    credential_dir = paths.state_dir / "ssh-credentials" / str(credential.pk)
+    credential_dir.mkdir(mode=0o700, parents=True, exist_ok=True)
+    os.chmod(credential_dir, 0o700)
+
+    identity_file = identity_path(credential)
+    if credential.key_path:
+        os.chmod(identity_file, 0o600)
+    else:
+        identity_file.write_text(_with_trailing_newline(credential.private_key), encoding="utf-8")
+        os.chmod(identity_file, 0o600)
+
+    result = {"identity_file": str(identity_file)}
+    if credential.known_hosts.strip():
+        known_hosts = credential_dir / "known_hosts"
+        known_hosts.write_text(_with_trailing_newline(credential.known_hosts), encoding="utf-8")
+        os.chmod(known_hosts, 0o600)
+        result["known_hosts"] = str(known_hosts)
+    else:
+        known_hosts = paths.state_dir / "known_hosts"
+        known_hosts.parent.mkdir(mode=0o700, parents=True, exist_ok=True)
+        known_hosts.touch(mode=0o600, exist_ok=True)
+        os.chmod(known_hosts, 0o600)
+        result["accept_new_known_hosts"] = str(known_hosts)
+    return result
+
+
+def _has_ssh_option(options: list[str], name: str) -> bool:
+    prefix = f"-o{name}="
+    spaced = f"-o{name} "
+    return any(option == name or option.startswith(prefix) or option.startswith(spaced) for option in options)
+
+
+def _with_trailing_newline(value: str) -> str:
+    return value if value.endswith("\n") else f"{value}\n"

src/pobsync_backend/forms.py

@@ -0,0 +1,409 @@
+from __future__ import annotations
+
+import os
+import textwrap
+import subprocess
+from pathlib import Path
+from tempfile import TemporaryDirectory
+
+from django import forms
+from django.conf import settings
+
+from .models import GlobalConfig, HostConfig, ScheduleConfig, SshCredential
+from .scheduler import parse_cron_expr
+
+
+class NewlineListField(forms.CharField):
+    widget = forms.Textarea
+
+    def __init__(self, *args, **kwargs) -> None:
+        kwargs.setdefault("required", False)
+        super().__init__(*args, **kwargs)
+
+    def prepare_value(self, value):
+        if isinstance(value, list):
+            return "\n".join(str(item) for item in value)
+        return value
+
+    def to_python(self, value) -> list[str]:
+        if not value:
+            return []
+        if isinstance(value, list):
+            return [str(item).strip() for item in value if str(item).strip()]
+        return [line.strip() for line in str(value).splitlines() if line.strip()]
+
+
+class NullableNewlineListField(NewlineListField):
+    def to_python(self, value) -> list[str] | None:
+        parsed = super().to_python(value)
+        return parsed or None
+
+
+class HostConfigForm(forms.ModelForm):
+    includes = NewlineListField(help_text="One include path per line. Leave empty to include defaults.")
+    excludes_add = NewlineListField(help_text="One additional exclude pattern per line.")
+    excludes_replace = NullableNewlineListField(
+        help_text="Optional. When set, replaces global excludes; one pattern per line."
+    )
+    rsync_extra_args = NewlineListField(help_text="One extra rsync argument per line.")
+
+    class Meta:
+        model = HostConfig
+        fields = (
+            "address",
+            "enabled",
+            "ssh_credential",
+            "ssh_user",
+            "ssh_port",
+            "source_root",
+            "includes",
+            "excludes_add",
+            "excludes_replace",
+            "rsync_extra_args",
+            "retention_daily",
+            "retention_weekly",
+            "retention_monthly",
+            "retention_yearly",
+        )
+        help_texts = {
+            "ssh_credential": "Optional. Overrides the global SSH credential for this host.",
+            "ssh_user": "Leave empty to use the global SSH user.",
+            "ssh_port": "Leave empty to use the global SSH port.",
+            "source_root": "Leave empty to use the global default source root.",
+        }
+
+
+class CreateHostConfigForm(HostConfigForm):
+    class Meta(HostConfigForm.Meta):
+        fields = ("host", *HostConfigForm.Meta.fields)
+        help_texts = {
+            **HostConfigForm.Meta.help_texts,
+            "host": "Stable internal host name used for backup paths.",
+        }
+
+
+class GlobalConfigForm(forms.ModelForm):
+    ssh_options = NewlineListField(help_text="One SSH option per line.")
+    rsync_args = NewlineListField(help_text="One default rsync argument per line.")
+    rsync_extra_args = NewlineListField(help_text="One extra rsync argument per line.")
+    excludes_default = NewlineListField(help_text="One default exclude pattern per line.")
+
+    class Meta:
+        model = GlobalConfig
+        fields = (
+            "name",
+            "default_ssh_credential",
+            "ssh_user",
+            "ssh_port",
+            "ssh_options",
+            "rsync_binary",
+            "rsync_args",
+            "rsync_extra_args",
+            "rsync_timeout_seconds",
+            "rsync_bwlimit_kbps",
+            "default_source_root",
+            "default_destination_subdir",
+            "excludes_default",
+            "retention_daily",
+            "retention_weekly",
+            "retention_monthly",
+            "retention_yearly",
+        )
+        help_texts = {
+            "name": "Usually 'default'. The backup engine currently reads the default config.",
+            "default_ssh_credential": "Optional. Used by hosts without their own SSH credential.",
+            "default_source_root": "Used by hosts without a custom source root.",
+            "default_destination_subdir": "Optional subdirectory below each snapshot.",
+        }
+
+    def save(self, commit: bool = True):
+        instance = super().save(commit=False)
+        instance.backup_root = settings.POBSYNC_BACKUP_ROOT
+        if commit:
+            instance.save()
+            self.save_m2m()
+        return instance
+
+
+class ManualBackupForm(forms.Form):
+    dry_run = forms.BooleanField(
+        label="Dry run",
+        required=False,
+        initial=True,
+        help_text="Queue rsync in dry-run mode without writing a snapshot.",
+    )
+    verbose_output = forms.BooleanField(
+        label="Verbose rsync output",
+        required=False,
+        help_text="Write itemized rsync changes, file-list progress, and stats to the run log. Dry-runs always use this.",
+    )
+    prune = forms.BooleanField(
+        label="Apply retention after success",
+        required=False,
+        help_text="Apply retention after a successful non-dry-run backup.",
+    )
+    prune_max_delete = forms.IntegerField(label="Retention max delete", min_value=0, initial=10)
+    prune_protect_bases = forms.BooleanField(
+        label="Protect base snapshots",
+        required=False,
+        help_text="Keep snapshots that are used as bases by other snapshots.",
+    )
+
+
+class SshCredentialForm(forms.ModelForm):
+    private_key_file = forms.FileField(
+        required=False,
+        help_text="Optional. Upload the private key file directly to avoid copy/paste formatting problems.",
+    )
+    private_key = forms.CharField(
+        widget=forms.Textarea(attrs={"spellcheck": "false", "autocomplete": "off"}),
+        required=False,
+        help_text=(
+            "Paste the complete unencrypted OpenSSH private key, including BEGIN/END lines. "
+            "Leave empty when uploading a private key file."
+        ),
+    )
+    public_key = forms.CharField(
+        widget=forms.Textarea(attrs={"spellcheck": "false", "autocomplete": "off"}),
+        required=False,
+        help_text="Optional. If set, pobsync verifies it matches the private key.",
+    )
+    known_hosts = forms.CharField(
+        widget=forms.Textarea(attrs={"spellcheck": "false", "autocomplete": "off"}),
+        required=False,
+        help_text="Optional known_hosts entries. When set, StrictHostKeyChecking can stay enabled.",
+    )
+    notes = forms.CharField(widget=forms.Textarea, required=False)
+
+    class Meta:
+        model = SshCredential
+        fields = ("name", "private_key", "public_key", "known_hosts", "notes")
+
+    def clean_private_key(self) -> str:
+        uploaded_file = self.files.get("private_key_file")
+        if uploaded_file:
+            try:
+                raw_private_key = uploaded_file.read().decode("utf-8")
+            except UnicodeDecodeError as exc:
+                raise forms.ValidationError("SSH private key files must be UTF-8 text files.") from exc
+        else:
+            raw_private_key = self.cleaned_data.get("private_key", "")
+
+        if not raw_private_key.strip():
+            if self.instance and self.instance.pk and self.instance.key_path:
+                return self.instance.private_key
+            raise forms.ValidationError("Paste a private key, upload a private key file, or generate a key in pobsync.")
+
+        private_key = normalize_private_key(raw_private_key)
+        public_key = validate_ssh_private_key(private_key)
+        self.derived_public_key = public_key
+        return f"{private_key}\n"
+
+    def clean(self):
+        cleaned_data = super().clean()
+        provided_public_key = normalize_public_key(cleaned_data.get("public_key", ""))
+        if provided_public_key:
+            cleaned_data["public_key"] = provided_public_key
+        elif self.instance and self.instance.pk and self.instance.key_path:
+            cleaned_data["public_key"] = self.instance.public_key
+
+        if cleaned_data.get("private_key") and provided_public_key and hasattr(self, "derived_public_key"):
+            if public_key_identity(provided_public_key) != public_key_identity(self.derived_public_key):
+                self.add_error(
+                    "public_key",
+                    forms.ValidationError("Public key does not match the supplied private key."),
+                )
+        elif cleaned_data.get("private_key") and not provided_public_key and hasattr(self, "derived_public_key"):
+            cleaned_data["public_key"] = self.derived_public_key
+        return cleaned_data
+
+
+class SshCredentialGenerateForm(forms.Form):
+    name = forms.CharField(max_length=128)
+    key_type = forms.ChoiceField(
+        choices=(("ed25519", "ed25519"), ("rsa", "rsa")),
+        initial="ed25519",
+        help_text="ed25519 is recommended unless you need RSA for an older target.",
+    )
+    set_global_default = forms.BooleanField(
+        required=False,
+        initial=True,
+        help_text="Use this key as the global default when the default global config exists.",
+    )
+    known_hosts = forms.CharField(
+        widget=forms.Textarea(attrs={"spellcheck": "false", "autocomplete": "off"}),
+        required=False,
+        help_text="Optional known_hosts entries. This can also be filled later.",
+    )
+    notes = forms.CharField(widget=forms.Textarea, required=False)
+
+    def clean_name(self) -> str:
+        name = self.cleaned_data["name"].strip()
+        if SshCredential.objects.filter(name=name).exists():
+            raise forms.ValidationError("An SSH credential with this name already exists.")
+        return name
+
+
+class RetentionApplyForm(forms.Form):
+    kind = forms.ChoiceField(choices=(("scheduled", "Scheduled"), ("manual", "Manual"), ("all", "All")))
+    protect_bases = forms.BooleanField(required=False)
+    max_delete = forms.IntegerField(min_value=0, initial=10)
+    confirm_delete_count = forms.IntegerField(min_value=0)
+    confirm_host = forms.CharField()
+
+    def __init__(self, *args, host_name: str, expected_delete_count: int | None = None, **kwargs) -> None:
+        self.host_name = host_name
+        self.expected_delete_count = expected_delete_count
+        super().__init__(*args, **kwargs)
+        self.fields["confirm_host"].help_text = f"Type {host_name} to confirm deletion."
+        if expected_delete_count is not None:
+            self.fields["confirm_delete_count"].help_text = (
+                f"Type {expected_delete_count} to confirm the current number of planned deletions."
+            )
+
+    def clean_confirm_host(self) -> str:
+        value = self.cleaned_data["confirm_host"].strip()
+        if value != self.host_name:
+            raise forms.ValidationError(f"Type {self.host_name} to confirm.")
+        return value
+
+    def clean_confirm_delete_count(self) -> int:
+        value = self.cleaned_data["confirm_delete_count"]
+        if self.expected_delete_count is not None and value != self.expected_delete_count:
+            raise forms.ValidationError(f"Type {self.expected_delete_count} to confirm the delete count.")
+        return value
+
+
+class IncompleteCleanupForm(forms.Form):
+    max_delete = forms.IntegerField(min_value=0, initial=0)
+    confirm_delete_count = forms.IntegerField(min_value=0)
+    confirm_host = forms.CharField()
+
+    def __init__(self, *args, host_name: str, expected_delete_count: int, **kwargs) -> None:
+        self.host_name = host_name
+        self.expected_delete_count = expected_delete_count
+        super().__init__(*args, **kwargs)
+        self.fields["confirm_host"].help_text = f"Type {host_name} to confirm incomplete snapshot cleanup."
+        self.fields["confirm_delete_count"].help_text = (
+            f"Type {expected_delete_count} to confirm the current number of incomplete snapshots."
+        )
+        self.fields["max_delete"].help_text = (
+            f"Must be at least {expected_delete_count} for the incomplete snapshots shown here."
+        )
+
+    def clean_confirm_host(self) -> str:
+        value = self.cleaned_data["confirm_host"].strip()
+        if value != self.host_name:
+            raise forms.ValidationError(f"Type {self.host_name} to confirm.")
+        return value
+
+    def clean_confirm_delete_count(self) -> int:
+        value = self.cleaned_data["confirm_delete_count"]
+        if value != self.expected_delete_count:
+            raise forms.ValidationError(f"Type {self.expected_delete_count} to confirm the incomplete count.")
+        return value
+
+
+class ScheduleConfigForm(forms.ModelForm):
+    cron_expr = forms.CharField(
+        label="Schedule expression",
+        help_text=(
+            'Five-field cron-style expression, for example "15 2 * * *". '
+            "This is evaluated by the pobsync scheduler service, not host cron."
+        ),
+    )
+    prune_max_delete = forms.IntegerField(min_value=0)
+
+    class Meta:
+        model = ScheduleConfig
+        fields = (
+            "cron_expr",
+            "enabled",
+            "prune",
+            "prune_max_delete",
+            "prune_protect_bases",
+        )
+
+    def clean_cron_expr(self) -> str:
+        cron_expr = self.cleaned_data["cron_expr"].strip()
+        try:
+            parse_cron_expr(cron_expr)
+        except ValueError as exc:
+            raise forms.ValidationError(str(exc)) from exc
+        return cron_expr
+
+
+def normalize_private_key(private_key: str) -> str:
+    normalized = private_key.replace("\r\n", "\n").replace("\r", "\n").strip().lstrip("\ufeff")
+
+    begin_marker = "-----BEGIN OPENSSH PRIVATE KEY-----"
+    end_marker = "-----END OPENSSH PRIVATE KEY-----"
+    if begin_marker in normalized and end_marker in normalized:
+        before_body, after_begin = normalized.split(begin_marker, 1)
+        body, after_end = after_begin.split(end_marker, 1)
+        if before_body.strip() or after_end.strip():
+            return normalized
+        compact_body = "".join(body.split())
+        wrapped_body = "\n".join(textwrap.wrap(compact_body, width=70))
+        return f"{begin_marker}\n{wrapped_body}\n{end_marker}"
+
+    return normalized
+
+
+def normalize_public_key(public_key: str) -> str:
+    return " ".join(public_key.strip().split())
+
+
+def public_key_identity(public_key: str) -> str:
+    parts = normalize_public_key(public_key).split()
+    if len(parts) >= 2:
+        return " ".join(parts[:2])
+    return normalize_public_key(public_key)
+
+
+def validate_ssh_private_key(private_key: str) -> str:
+    if "BEGIN OPENSSH PRIVATE KEY" not in private_key:
+        stripped = private_key.strip()
+        if stripped.startswith(("ssh-ed25519 ", "ssh-rsa ", "ecdsa-sha2-", "sk-")):
+            raise forms.ValidationError("This looks like a public key. Paste the private key in this field.")
+        if "BEGIN RSA PRIVATE KEY" in stripped or "BEGIN EC PRIVATE KEY" in stripped:
+            raise forms.ValidationError(
+                "PEM private keys are not supported here yet. Convert it to an unencrypted OpenSSH key first."
+            )
+        raise forms.ValidationError("Invalid SSH private key: missing OpenSSH private key header.")
+
+    with TemporaryDirectory() as tmp:
+        key_path = Path(tmp) / "identity"
+        key_path.write_text(f"{private_key}\n", encoding="utf-8")
+        os.chmod(key_path, 0o600)
+        try:
+            result = subprocess.run(
+                ["ssh-keygen", "-y", "-f", str(key_path)],
+                check=False,
+                stdin=subprocess.DEVNULL,
+                stdout=subprocess.PIPE,
+                stderr=subprocess.PIPE,
+                text=True,
+                timeout=5,
+            )
+        except FileNotFoundError as exc:
+            raise forms.ValidationError("ssh-keygen is not available in this container.") from exc
+        except subprocess.TimeoutExpired as exc:
+            raise forms.ValidationError("Could not validate SSH private key before timeout.") from exc
+
+    if result.returncode != 0:
+        message = result.stderr.strip() or "OpenSSH could not read this private key."
+        lower_message = message.lower()
+        if "passphrase" in lower_message:
+            message = "Encrypted SSH private keys are not supported for unattended backups."
+        elif "libcrypto" in lower_message:
+            message = (
+                "OpenSSH could not parse this key. It is usually incomplete, corrupted while copying, "
+                "or not an unencrypted OpenSSH private key."
+            )
+        raise forms.ValidationError(f"Invalid SSH private key: {message}")
+
+    public_key = result.stdout.strip()
+    if not public_key:
+        raise forms.ValidationError("Invalid SSH private key: no public key could be derived.")
+    return public_key

src/pobsync_backend/host_ops.py

@@ -0,0 +1,103 @@
+from __future__ import annotations
+
+import os
+from pathlib import Path
+
+from pobsync.snapshot_meta import resolve_host_root
+
+from .config_checks import collect_effective_host_config_checks
+from .models import GlobalConfig, HostConfig
+from .self_check import SelfCheck
+from .ssh_keys import identity_path
+
+
+HOST_BACKUP_SUBDIRS = ("scheduled", "manual", ".incomplete")
+
+
+def ensure_host_directories(host: HostConfig, global_config: GlobalConfig | None = None) -> Path:
+    global_config = global_config or GlobalConfig.objects.get(name="default")
+    host_root = resolve_host_root(global_config.backup_root, host.host)
+    for subdir in HOST_BACKUP_SUBDIRS:
+        (host_root / subdir).mkdir(parents=True, exist_ok=True)
+    return host_root
+
+
+def collect_host_checks(host: HostConfig, global_config: GlobalConfig | None = None) -> list[SelfCheck]:
+    checks: list[SelfCheck] = []
+    try:
+        global_config = global_config or GlobalConfig.objects.get(name="default")
+    except GlobalConfig.DoesNotExist:
+        return [SelfCheck("Host global config", "failed", "Default global config does not exist.")]
+
+    checks.append(
+        SelfCheck(
+            "Host enabled",
+            "ok" if host.enabled else "warning",
+            "Host is enabled." if host.enabled else "Host is disabled.",
+        )
+    )
+    checks.append(
+        SelfCheck(
+            "Host address",
+            "ok" if host.address.strip() else "failed",
+            host.address.strip() or "Host address is empty.",
+        )
+    )
+
+    credential = host.ssh_credential or global_config.default_ssh_credential
+    if credential is None:
+        checks.append(SelfCheck("Host SSH credential", "warning", "No host or global SSH credential selected."))
+    else:
+        checks.append(SelfCheck("Host SSH credential", "ok", str(credential)))
+        if credential.key_path:
+            key_path = identity_path(credential)
+            checks.append(
+                _host_path_check("Host SSH key file", key_path, must_exist=True, must_be_writable=False, must_be_readable=True)
+            )
+        elif credential.private_key:
+            checks.append(
+                SelfCheck(
+                    "Host SSH key storage",
+                    "warning",
+                    "Selected credential stores private key material in the database.",
+                    "Generated filesystem keys are recommended for native systemd installs.",
+                )
+            )
+        if credential.known_hosts.strip():
+            checks.append(SelfCheck("Host known_hosts", "ok", "Selected credential has known_hosts entries."))
+        else:
+            checks.append(
+                SelfCheck(
+                    "Host known_hosts",
+                    "warning",
+                    "Selected credential has no pinned known_hosts entries.",
+                    "pobsync will use service-level StrictHostKeyChecking=accept-new on first connect.",
+                )
+            )
+
+    host_root = resolve_host_root(global_config.backup_root, host.host)
+    checks.append(_host_path_check("Host backup root", host_root, must_exist=True, must_be_writable=True))
+    for subdir in HOST_BACKUP_SUBDIRS:
+        checks.append(_host_path_check(f"Host directory: {subdir}", host_root / subdir, must_exist=True, must_be_writable=True))
+    checks.extend(collect_effective_host_config_checks(host, global_config))
+    return checks
+
+
+def _host_path_check(
+    name: str,
+    path: Path,
+    *,
+    must_exist: bool,
+    must_be_writable: bool,
+    must_be_readable: bool = False,
+) -> SelfCheck:
+    if must_exist and not path.exists():
+        return SelfCheck(name, "failed", f"{path} does not exist.")
+    target = path if path.exists() else path.parent
+    if not target.exists():
+        return SelfCheck(name, "failed", f"{target} does not exist.")
+    if must_be_writable and not os.access(target, os.W_OK):
+        return SelfCheck(name, "failed", f"{target} is not writable by this process.")
+    if must_be_readable and not os.access(target, os.R_OK):
+        return SelfCheck(name, "failed", f"{target} is not readable by this process.")
+    return SelfCheck(name, "ok", str(path))

src/pobsync_backend/management/__init__.py

@@ -0,0 +1 @@
+

src/pobsync_backend/management/commands/__init__.py

@@ -0,0 +1 @@
+

src/pobsync_backend/management/commands/check_pobsync_install.py

@@ -0,0 +1,44 @@
+from __future__ import annotations
+
+from django.core.management.base import BaseCommand, CommandError
+
+from pobsync_backend.self_check import collect_self_checks, summarize_self_checks
+
+
+class Command(BaseCommand):
+    help = "Run pobsync runtime self checks for native installs and updates."
+
+    def add_arguments(self, parser):
+        parser.add_argument(
+            "--fail-on-warning",
+            action="store_true",
+            help="Exit with an error when warnings are present.",
+        )
+
+    def handle(self, *args, **options):
+        checks = collect_self_checks()
+        summary = summarize_self_checks(checks)
+
+        for check in checks:
+            line = f"[{check.status.upper()}] {check.name}: {check.message}"
+            if check.detail:
+                line = f"{line} ({check.detail})"
+            if check.status == "failed":
+                self.stderr.write(line)
+            elif check.status == "warning":
+                self.stderr.write(line)
+            else:
+                self.stdout.write(line)
+
+        self.stdout.write(
+            "Summary: "
+            f"{summary['ok']} ok, "
+            f"{summary['warning']} warning(s), "
+            f"{summary['failed']} failed, "
+            f"{summary['skipped']} skipped"
+        )
+
+        if summary["failed"]:
+            raise CommandError("pobsync install self check failed.")
+        if options["fail_on_warning"] and summary["warning"]:
+            raise CommandError("pobsync install self check reported warnings.")

src/pobsync_backend/management/commands/configure_pobsync_global.py

@@ -0,0 +1,55 @@
+from __future__ import annotations
+
+from typing import Any
+
+from django.core.management.base import BaseCommand, CommandError
+
+from pobsync.config.retention import parse_retention
+from pobsync.config.defaults import DEFAULT_EXCLUDES, DEFAULT_RSYNC_ARGS
+from pobsync.util import is_absolute_non_root
+from pobsync_backend.models import GlobalConfig
+
+
+class Command(BaseCommand):
+    help = "Create or update the default global backup configuration."
+
+    def add_arguments(self, parser) -> None:
+        parser.add_argument("--name", default="default")
+        parser.add_argument("--backup-root", required=True)
+        parser.add_argument("--ssh-user", default="root")
+        parser.add_argument("--ssh-port", type=int, default=22)
+        parser.add_argument("--source-root", default="/")
+        parser.add_argument("--retention", default="daily=14,weekly=8,monthly=12,yearly=0")
+        parser.add_argument("--force", action="store_true", help="Update existing config")
+
+    def handle(self, *args: Any, **options: Any) -> None:
+        backup_root = options["backup_root"]
+        if not is_absolute_non_root(backup_root):
+            raise CommandError("--backup-root must be an absolute path and must not be '/'")
+
+        retention = parse_retention(options["retention"])
+        defaults = {
+            "backup_root": backup_root,
+            "ssh_user": options["ssh_user"],
+            "ssh_port": options["ssh_port"],
+            "ssh_options": ["-oBatchMode=yes", "-oStrictHostKeyChecking=accept-new"],
+            "rsync_binary": "rsync",
+            "rsync_args": DEFAULT_RSYNC_ARGS,
+            "rsync_extra_args": [],
+            "rsync_timeout_seconds": 0,
+            "rsync_bwlimit_kbps": 0,
+            "default_source_root": options["source_root"],
+            "default_destination_subdir": "",
+            "excludes_default": DEFAULT_EXCLUDES,
+            "retention_daily": retention["daily"],
+            "retention_weekly": retention["weekly"],
+            "retention_monthly": retention["monthly"],
+            "retention_yearly": retention["yearly"],
+        }
+
+        if GlobalConfig.objects.filter(name=options["name"]).exists() and not options["force"]:
+            raise CommandError(f"Global config {options['name']!r} already exists; use --force to update")
+
+        _obj, created = GlobalConfig.objects.update_or_create(name=options["name"], defaults=defaults)
+        action = "Created" if created else "Updated"
+        self.stdout.write(self.style.SUCCESS(f"{action} global config {options['name']!r}."))

src/pobsync_backend/management/commands/configure_pobsync_host.py

@@ -0,0 +1,65 @@
+from __future__ import annotations
+
+from typing import Any
+
+from django.core.management.base import BaseCommand, CommandError
+
+from pobsync.config.retention import parse_retention
+from pobsync.util import sanitize_host
+from pobsync_backend.models import GlobalConfig, HostConfig
+
+
+class Command(BaseCommand):
+    help = "Create or update a host backup configuration."
+
+    def add_arguments(self, parser) -> None:
+        parser.add_argument("host")
+        parser.add_argument("--address", required=True)
+        parser.add_argument("--ssh-user", default="")
+        parser.add_argument("--ssh-port", type=int, default=None)
+        parser.add_argument("--source-root", default="")
+        parser.add_argument("--include", action="append", default=[])
+        parser.add_argument("--exclude-add", action="append", default=[])
+        parser.add_argument("--exclude-replace", action="append", default=None)
+        parser.add_argument("--rsync-extra-arg", action="append", default=[])
+        parser.add_argument("--retention", default=None)
+        parser.add_argument("--disabled", action="store_true")
+        parser.add_argument("--force", action="store_true", help="Update existing host")
+
+    def handle(self, *args: Any, **options: Any) -> None:
+        host = sanitize_host(options["host"])
+        if HostConfig.objects.filter(host=host).exists() and not options["force"]:
+            raise CommandError(f"Host {host!r} already exists; use --force to update")
+
+        retention = self._retention(options["retention"])
+        defaults = {
+            "address": options["address"],
+            "enabled": not options["disabled"],
+            "ssh_user": options["ssh_user"],
+            "ssh_port": options["ssh_port"],
+            "source_root": options["source_root"],
+            "includes": list(options["include"]),
+            "excludes_add": [] if options["exclude_replace"] is not None else list(options["exclude_add"]),
+            "excludes_replace": options["exclude_replace"],
+            "rsync_extra_args": list(options["rsync_extra_arg"]),
+            "retention_daily": retention["daily"],
+            "retention_weekly": retention["weekly"],
+            "retention_monthly": retention["monthly"],
+            "retention_yearly": retention["yearly"],
+        }
+        _obj, created = HostConfig.objects.update_or_create(host=host, defaults=defaults)
+        action = "Created" if created else "Updated"
+        self.stdout.write(self.style.SUCCESS(f"{action} host {host!r}."))
+
+    def _retention(self, value: str | None) -> dict[str, int]:
+        if value:
+            return parse_retention(value)
+        global_config = GlobalConfig.objects.filter(name="default").first()
+        if global_config is None:
+            return {"daily": 14, "weekly": 8, "monthly": 12, "yearly": 0}
+        return {
+            "daily": global_config.retention_daily,
+            "weekly": global_config.retention_weekly,
+            "monthly": global_config.retention_monthly,
+            "yearly": global_config.retention_yearly,
+        }

src/pobsync_backend/management/commands/configure_pobsync_schedule.py

@@ -0,0 +1,59 @@
+from __future__ import annotations
+
+from typing import Any
+
+from django.core.management.base import BaseCommand, CommandError
+
+from pobsync_backend.models import HostConfig, ScheduleConfig
+from pobsync_backend.scheduler import parse_cron_expr
+
+
+class Command(BaseCommand):
+    help = "Create, update, disable, or remove a scheduler-managed host schedule."
+
+    def add_arguments(self, parser) -> None:
+        parser.add_argument("host")
+        parser.add_argument(
+            "--schedule-expression",
+            "--cron",
+            dest="schedule_expression",
+            help='Five-field schedule expression, e.g. "15 2 * * *"',
+        )
+        parser.add_argument("--prune", action="store_true")
+        parser.add_argument("--prune-max-delete", type=int, default=10)
+        parser.add_argument("--prune-protect-bases", action="store_true")
+        parser.add_argument("--disabled", action="store_true")
+        parser.add_argument("--delete", action="store_true")
+
+    def handle(self, *args: Any, **options: Any) -> None:
+        try:
+            host = HostConfig.objects.get(host=options["host"])
+        except HostConfig.DoesNotExist as exc:
+            raise CommandError(f"Missing host {options['host']!r}") from exc
+
+        if options["delete"]:
+            deleted, _details = ScheduleConfig.objects.filter(host=host).delete()
+            self.stdout.write(self.style.SUCCESS(f"Deleted {deleted} schedule row(s) for {host.host!r}."))
+            return
+
+        schedule_expression = options["schedule_expression"]
+        if not schedule_expression:
+            raise CommandError("--schedule-expression is required unless --delete is used")
+        try:
+            parse_cron_expr(schedule_expression)
+        except ValueError as exc:
+            raise CommandError(str(exc)) from exc
+
+        schedule, created = ScheduleConfig.objects.update_or_create(
+            host=host,
+            defaults={
+                "cron_expr": schedule_expression,
+                "enabled": not options["disabled"],
+                "prune": bool(options["prune"]),
+                "prune_max_delete": int(options["prune_max_delete"]),
+                "prune_protect_bases": bool(options["prune_protect_bases"]),
+            },
+        )
+        action = "Created" if created else "Updated"
+        state = "enabled" if schedule.enabled else "disabled"
+        self.stdout.write(self.style.SUCCESS(f"{action} {state} schedule for {host.host!r}."))

src/pobsync_backend/management/commands/discover_pobsync_snapshots.py

@@ -0,0 +1,39 @@
+from __future__ import annotations
+
+from typing import Any
+
+from django.core.management.base import BaseCommand, CommandError
+
+from pobsync.snapshot_meta import normalize_kind
+from pobsync_backend.models import GlobalConfig, HostConfig
+from pobsync_backend.snapshot_discovery import discover_snapshots
+
+
+class Command(BaseCommand):
+    help = "Discover snapshot metadata on disk and upsert SnapshotRecord rows."
+
+    def add_arguments(self, parser) -> None:
+        parser.add_argument("--host", default=None)
+        parser.add_argument("--kind", default="all", help="scheduled|manual|incomplete|all")
+
+    def handle(self, *args: Any, **options: Any) -> None:
+        try:
+            global_config = GlobalConfig.objects.get(name="default")
+        except GlobalConfig.DoesNotExist as exc:
+            raise CommandError("Missing default global config") from exc
+
+        host = None
+        if options["host"]:
+            try:
+                host = HostConfig.objects.get(host=options["host"], enabled=True)
+            except HostConfig.DoesNotExist as exc:
+                raise CommandError(f"Missing enabled host {options['host']!r}") from exc
+
+        kind = normalize_kind(options["kind"])
+        kinds = ["scheduled", "manual", "incomplete"] if kind == "all" else [kind]
+        result = discover_snapshots(host=host, global_config=global_config, kinds=kinds)
+        self.stdout.write(
+            self.style.SUCCESS(
+                f"Scanned {result['scanned']} snapshot(s), created {result['created']}, updated {result['updated']}."
+            )
+        )

src/pobsync_backend/management/commands/ensure_pobsync_ssh_key.py

@@ -0,0 +1,47 @@
+from __future__ import annotations
+
+from django.core.management.base import BaseCommand, CommandError
+
+from pobsync_backend.models import GlobalConfig, SshCredential
+from pobsync_backend.ssh_keys import SshKeyError, generate_ssh_key
+
+
+class Command(BaseCommand):
+    help = "Ensure a filesystem-backed SSH key exists for pobsync backups."
+
+    def add_arguments(self, parser):
+        parser.add_argument("--name", default="default", help="Credential name to create or reuse.")
+        parser.add_argument("--key-type", default="ed25519", choices=("ed25519", "rsa"))
+        parser.add_argument(
+            "--set-global-default",
+            action="store_true",
+            help="Set this key as default on the default global config when it exists.",
+        )
+
+    def handle(self, *args, **options):
+        name = options["name"]
+        credential, created = SshCredential.objects.get_or_create(
+            name=name,
+            defaults={
+                "key_type": options["key_type"],
+                "notes": "Generated by pobsync installer.",
+            },
+        )
+
+        if not credential.key_path and not credential.private_key:
+            try:
+                generate_ssh_key(credential, key_type=options["key_type"])
+            except SshKeyError as exc:
+                raise CommandError(str(exc)) from exc
+            created = True
+
+        if options["set_global_default"]:
+            global_config = GlobalConfig.objects.filter(name="default").first()
+            if global_config is not None and global_config.default_ssh_credential_id is None:
+                global_config.default_ssh_credential = credential
+                global_config.save(update_fields=["default_ssh_credential", "updated_at"])
+
+        action = "created" if created else "exists"
+        self.stdout.write(self.style.SUCCESS(f"SSH credential {action}: {credential.name}"))
+        if credential.public_key:
+            self.stdout.write(credential.public_key)

src/pobsync_backend/management/commands/run_pobsync_backup.py

@@ -0,0 +1,67 @@
+from __future__ import annotations
+
+from pathlib import Path
+from typing import Any
+
+from django.conf import settings
+from django.core.management.base import BaseCommand, CommandError
+
+from pobsync.paths import PobsyncPaths
+from pobsync_backend.backup_runner import execute_backup_run
+from pobsync_backend.models import BackupRun, HostConfig
+
+
+class Command(BaseCommand):
+    help = "Run a pobsync backup and record the result in Django."
+
+    def add_arguments(self, parser) -> None:
+        parser.add_argument("host", help="Host to back up")
+        parser.add_argument("--prefix", default=settings.POBSYNC_HOME, help="Runtime state root")
+        parser.add_argument("--dry-run", action="store_true", help="Run rsync --dry-run")
+        parser.add_argument("--verbose-rsync", action="store_true", help="Write itemized rsync output to the run log")
+        parser.add_argument("--prune", action="store_true", help="Apply retention after a successful run")
+        parser.add_argument("--prune-max-delete", type=int, default=10)
+        parser.add_argument("--prune-protect-bases", action="store_true")
+        parser.add_argument("--manual", action="store_true", help="Record the run as manual instead of scheduled")
+
+    def handle(self, *args: Any, **options: Any) -> None:
+        host_name = options["host"]
+        paths = PobsyncPaths(home=Path(options["prefix"]))
+        try:
+            host = HostConfig.objects.get(host=host_name, enabled=True)
+        except HostConfig.DoesNotExist as exc:
+            raise CommandError(f"Missing enabled host {host_name!r}") from exc
+
+        run = BackupRun.objects.create(
+            host=host,
+            run_type=BackupRun.RunType.MANUAL if options["manual"] else BackupRun.RunType.SCHEDULED,
+            status=BackupRun.Status.RUNNING,
+            result={
+                "requested": {
+                    "dry_run": bool(options["dry_run"]),
+                    "verbose_output": bool(options["dry_run"] or options["verbose_rsync"]),
+                    "prune": bool(options["prune"]),
+                    "prune_max_delete": int(options["prune_max_delete"]),
+                    "prune_protect_bases": bool(options["prune_protect_bases"]),
+                }
+            },
+        )
+        execute_backup_run(
+            run=run,
+            prefix=paths.home,
+            dry_run=bool(options["dry_run"]),
+            verbose_output=bool(options["dry_run"] or options["verbose_rsync"]),
+            prune=bool(options["prune"]),
+            prune_max_delete=int(options["prune_max_delete"]),
+            prune_protect_bases=bool(options["prune_protect_bases"]),
+        )
+        run.refresh_from_db()
+
+        if run.status == BackupRun.Status.SUCCESS:
+            self.stdout.write(self.style.SUCCESS(f"Backup completed for {host.host}."))
+            return
+        if run.status == BackupRun.Status.WARNING:
+            self.stdout.write(self.style.WARNING(f"Backup completed with warnings for {host.host}; run id={run.id}"))
+            return
+
+        raise CommandError(f"Backup failed for {host.host}; run id={run.id}")

src/pobsync_backend/management/commands/run_pobsync_retention.py

@@ -0,0 +1,50 @@
+from __future__ import annotations
+
+import json
+from pathlib import Path
+from typing import Any
+
+from django.conf import settings
+from django.core.management.base import BaseCommand, CommandError
+
+from pobsync.errors import ConfigError
+from pobsync_backend.retention import run_sql_retention_apply, run_sql_retention_plan
+
+
+class Command(BaseCommand):
+    help = "Plan or apply retention using the Django backup configuration."
+
+    def add_arguments(self, parser) -> None:
+        parser.add_argument("host")
+        parser.add_argument("--prefix", default=settings.POBSYNC_HOME, help="Runtime state root")
+        parser.add_argument("--kind", default="scheduled", choices=["scheduled", "manual", "all"])
+        parser.add_argument("--protect-bases", action="store_true")
+        parser.add_argument("--apply", action="store_true")
+        parser.add_argument("--yes", action="store_true")
+        parser.add_argument("--max-delete", type=int, default=10)
+
+    def handle(self, *args: Any, **options: Any) -> None:
+        host = options["host"]
+        try:
+            if options["apply"]:
+                if not options["yes"]:
+                    raise CommandError("--yes is required with --apply")
+                result = run_sql_retention_apply(
+                    prefix=Path(options["prefix"]),
+                    host=host,
+                    kind=options["kind"],
+                    protect_bases=bool(options["protect_bases"]),
+                    yes=True,
+                    max_delete=int(options["max_delete"]),
+                    action="cli",
+                )
+            else:
+                result = run_sql_retention_plan(
+                    host=host,
+                    kind=options["kind"],
+                    protect_bases=bool(options["protect_bases"]),
+                )
+        except ConfigError as exc:
+            raise CommandError(str(exc)) from exc
+
+        self.stdout.write(json.dumps(result, indent=2, sort_keys=False))

src/pobsync_backend/management/commands/run_pobsync_scheduler.py

@@ -0,0 +1,100 @@
+from __future__ import annotations
+
+import time
+from pathlib import Path
+from typing import Any
+
+from django.conf import settings
+from django.core.management import call_command
+from django.core.management.base import BaseCommand
+from django.db import transaction
+from django.utils import timezone
+
+from pobsync_backend.models import BackupRun, ScheduleConfig
+from pobsync_backend.scheduler import due_key, is_due
+
+
+class Command(BaseCommand):
+    help = "Run due pobsync schedules from the Django database."
+
+    def add_arguments(self, parser) -> None:
+        parser.add_argument("--prefix", default=settings.POBSYNC_HOME, help="Runtime state root")
+        parser.add_argument("--once", action="store_true", help="Check once and exit")
+        parser.add_argument("--loop", action="store_true", help="Keep checking schedules")
+        parser.add_argument("--interval", type=int, default=60, help="Loop interval in seconds")
+        parser.add_argument("--dry-run", action="store_true", help="Pass --dry-run to backup runs")
+
+    def handle(self, *args: Any, **options: Any) -> None:
+        if not options["once"] and not options["loop"]:
+            options["once"] = True
+
+        prefix = Path(options["prefix"])
+        while True:
+            count = self._run_due(prefix=prefix, dry_run=bool(options["dry_run"]))
+            self.stdout.write(f"Ran {count} due schedule(s).")
+            if options["once"]:
+                return
+            time.sleep(max(1, int(options["interval"])))
+
+    def _run_due(self, *, prefix: Path, dry_run: bool) -> int:
+        now = timezone.localtime(timezone.now())
+        current_due_key = due_key(now)
+        ran = 0
+
+        schedules = (
+            ScheduleConfig.objects.select_related("host")
+            .filter(enabled=True, host__enabled=True)
+            .order_by("host__host")
+        )
+        for schedule in schedules:
+            if schedule.last_due_key == current_due_key:
+                continue
+            if not is_due(schedule.cron_expr, now):
+                continue
+
+            schedule_started_at = timezone.now()
+            with transaction.atomic():
+                locked = ScheduleConfig.objects.select_for_update().get(pk=schedule.pk)
+                if locked.last_due_key == current_due_key:
+                    continue
+                locked.last_due_key = current_due_key
+                locked.last_started_at = schedule_started_at
+                locked.last_status = "running"
+                locked.save(update_fields=["last_due_key", "last_started_at", "last_status", "updated_at"])
+
+            status = "success"
+            try:
+                call_command(
+                    "run_pobsync_backup",
+                    schedule.host.host,
+                    prefix=str(prefix),
+                    dry_run=dry_run,
+                    prune=schedule.prune,
+                    prune_max_delete=schedule.prune_max_delete,
+                    prune_protect_bases=schedule.prune_protect_bases,
+                )
+                status = _latest_scheduled_run_status(host_id=schedule.host_id, started_at=schedule_started_at) or status
+            except Exception as exc:
+                status = "failed"
+                self.stderr.write(f"{schedule.host.host}: {type(exc).__name__}: {exc}")
+            finally:
+                ScheduleConfig.objects.filter(pk=schedule.pk).update(
+                    last_finished_at=timezone.now(),
+                    last_status=status,
+                )
+            ran += 1
+
+        return ran
+
+
+def _latest_scheduled_run_status(*, host_id: int, started_at) -> str | None:
+    run = (
+        BackupRun.objects.filter(
+            host_id=host_id,
+            run_type=BackupRun.RunType.SCHEDULED,
+            created_at__gte=started_at,
+        )
+        .order_by("-created_at", "-id")
+        .first()
+    )
+    return run.status if run is not None else None

src/pobsync_backend/management/commands/run_pobsync_worker.py

@@ -0,0 +1,60 @@
+from __future__ import annotations
+
+import time
+from pathlib import Path
+from typing import Any
+
+from django.conf import settings
+from django.core.management.base import BaseCommand
+
+from pobsync.paths import PobsyncPaths
+from pobsync_backend.backup_runner import claim_next_queued_run, execute_backup_run, reconcile_running_runs, requested_options
+
+
+class Command(BaseCommand):
+    help = "Run queued pobsync backup jobs from the Django database."
+
+    def add_arguments(self, parser) -> None:
+        parser.add_argument("--prefix", default=settings.POBSYNC_HOME, help="Runtime state root")
+        parser.add_argument("--once", action="store_true", help="Process one queued run and exit")
+        parser.add_argument("--loop", action="store_true", help="Keep checking for queued runs")
+        parser.add_argument("--interval", type=int, default=15, help="Loop interval in seconds")
+        parser.add_argument(
+            "--stale-running-seconds",
+            type=int,
+            default=24 * 60 * 60,
+            help="Mark running runs failed after this many seconds without a worker heartbeat; use 0 to disable",
+        )
+
+    def handle(self, *args: Any, **options: Any) -> None:
+        if not options["once"] and not options["loop"]:
+            options["once"] = True
+
+        paths = PobsyncPaths(home=Path(options["prefix"]))
+        while True:
+            count = self._run_once(prefix=paths.home, stale_running_seconds=int(options["stale_running_seconds"]))
+            self.stdout.write(f"Ran {count} queued backup run(s).")
+            if options["once"]:
+                return
+            time.sleep(max(1, int(options["interval"])))
+
+    def _run_once(self, *, prefix: Path, stale_running_seconds: int = 24 * 60 * 60) -> int:
+        reconciled = reconcile_running_runs(stale_worker_seconds=stale_running_seconds)
+        run = claim_next_queued_run()
+        if run is None:
+            return reconciled
+
+        options = requested_options(run)
+        try:
+            execute_backup_run(
+                run=run,
+                prefix=prefix,
+                dry_run=bool(options.get("dry_run", False)),
+                verbose_output=bool(options.get("verbose_output", False)),
+                prune=bool(options.get("prune", False)),
+                prune_max_delete=int(options.get("prune_max_delete", 10)),
+                prune_protect_bases=bool(options.get("prune_protect_bases", False)),
+            )
+        except Exception as exc:
+            self.stderr.write(f"{run.host.host}: {type(exc).__name__}: {exc}")
+        return reconciled + 1

src/pobsync_backend/migrations/0001_initial.py

@@ -0,0 +1,103 @@
+from __future__ import annotations
+
+import django.db.models.deletion
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+    initial = True
+
+    dependencies = []
+
+    operations = [
+        migrations.CreateModel(
+            name="GlobalConfig",
+            fields=[
+                ("id", models.BigAutoField(auto_created=True, primary_key=True, serialize=False, verbose_name="ID")),
+                ("created_at", models.DateTimeField(auto_now_add=True)),
+                ("updated_at", models.DateTimeField(auto_now=True)),
+                ("name", models.CharField(default="default", max_length=64, unique=True)),
+                ("backup_root", models.CharField(max_length=512)),
+                ("pobsync_home", models.CharField(default="/opt/pobsync", max_length=512)),
+                ("data", models.JSONField(blank=True, default=dict)),
+            ],
+            options={
+                "verbose_name": "global config",
+                "verbose_name_plural": "global configs",
+            },
+        ),
+        migrations.CreateModel(
+            name="HostConfig",
+            fields=[
+                ("id", models.BigAutoField(auto_created=True, primary_key=True, serialize=False, verbose_name="ID")),
+                ("created_at", models.DateTimeField(auto_now_add=True)),
+                ("updated_at", models.DateTimeField(auto_now=True)),
+                ("host", models.CharField(max_length=255, unique=True)),
+                ("address", models.CharField(max_length=255)),
+                ("enabled", models.BooleanField(default=True)),
+                ("config", models.JSONField(blank=True, default=dict)),
+            ],
+            options={
+                "ordering": ["host"],
+            },
+        ),
+        migrations.CreateModel(
+            name="BackupRun",
+            fields=[
+                ("id", models.BigAutoField(auto_created=True, primary_key=True, serialize=False, verbose_name="ID")),
+                ("run_type", models.CharField(choices=[("scheduled", "Scheduled"), ("manual", "Manual")], default="scheduled", max_length=16)),
+                ("status", models.CharField(choices=[("queued", "Queued"), ("running", "Running"), ("success", "Success"), ("failed", "Failed"), ("cancelled", "Cancelled")], default="queued", max_length=16)),
+                ("started_at", models.DateTimeField(blank=True, null=True)),
+                ("ended_at", models.DateTimeField(blank=True, null=True)),
+                ("snapshot_path", models.CharField(blank=True, max_length=1024)),
+                ("base_path", models.CharField(blank=True, max_length=1024)),
+                ("rsync_exit_code", models.IntegerField(blank=True, null=True)),
+                ("result", models.JSONField(blank=True, default=dict)),
+                ("created_at", models.DateTimeField(auto_now_add=True)),
+                ("host", models.ForeignKey(on_delete=django.db.models.deletion.PROTECT, related_name="runs", to="pobsync_backend.hostconfig")),
+            ],
+            options={
+                "ordering": ["-created_at"],
+            },
+        ),
+        migrations.CreateModel(
+            name="ScheduleConfig",
+            fields=[
+                ("id", models.BigAutoField(auto_created=True, primary_key=True, serialize=False, verbose_name="ID")),
+                ("created_at", models.DateTimeField(auto_now_add=True)),
+                ("updated_at", models.DateTimeField(auto_now=True)),
+                ("cron_expr", models.CharField(max_length=128)),
+                ("user", models.CharField(default="root", max_length=64)),
+                ("enabled", models.BooleanField(default=True)),
+                ("prune", models.BooleanField(default=False)),
+                ("prune_max_delete", models.PositiveIntegerField(default=10)),
+                ("prune_protect_bases", models.BooleanField(default=False)),
+                ("host", models.OneToOneField(on_delete=django.db.models.deletion.CASCADE, related_name="schedule", to="pobsync_backend.hostconfig")),
+            ],
+            options={
+                "ordering": ["host__host"],
+            },
+        ),
+        migrations.CreateModel(
+            name="SnapshotRecord",
+            fields=[
+                ("id", models.BigAutoField(auto_created=True, primary_key=True, serialize=False, verbose_name="ID")),
+                ("kind", models.CharField(choices=[("scheduled", "Scheduled"), ("manual", "Manual"), ("incomplete", "Incomplete")], max_length=16)),
+                ("dirname", models.CharField(max_length=255)),
+                ("path", models.CharField(max_length=1024)),
+                ("status", models.CharField(blank=True, max_length=32)),
+                ("started_at", models.DateTimeField(blank=True, null=True)),
+                ("ended_at", models.DateTimeField(blank=True, null=True)),
+                ("metadata", models.JSONField(blank=True, default=dict)),
+                ("discovered_at", models.DateTimeField(auto_now_add=True)),
+                ("host", models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name="snapshots", to="pobsync_backend.hostconfig")),
+            ],
+            options={
+                "ordering": ["host__host", "-started_at", "dirname"],
+            },
+        ),
+        migrations.AddConstraint(
+            model_name="snapshotrecord",
+            constraint=models.UniqueConstraint(fields=("host", "kind", "dirname"), name="unique_snapshot_per_host_kind"),
+        ),
+    ]

src/pobsync_backend/migrations/0002_schedule_run_state.py

@@ -0,0 +1,32 @@
+from __future__ import annotations
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+    dependencies = [
+        ("pobsync_backend", "0001_initial"),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name="scheduleconfig",
+            name="last_due_key",
+            field=models.CharField(blank=True, max_length=32),
+        ),
+        migrations.AddField(
+            model_name="scheduleconfig",
+            name="last_finished_at",
+            field=models.DateTimeField(blank=True, null=True),
+        ),
+        migrations.AddField(
+            model_name="scheduleconfig",
+            name="last_started_at",
+            field=models.DateTimeField(blank=True, null=True),
+        ),
+        migrations.AddField(
+            model_name="scheduleconfig",
+            name="last_status",
+            field=models.CharField(blank=True, max_length=16),
+        ),
+    ]

src/pobsync_backend/migrations/0003_structured_config_fields.py

@@ -0,0 +1,191 @@
+from __future__ import annotations
+
+from django.db import migrations, models
+
+
+def copy_json_config_to_fields(apps, schema_editor) -> None:
+    GlobalConfig = apps.get_model("pobsync_backend", "GlobalConfig")
+    HostConfig = apps.get_model("pobsync_backend", "HostConfig")
+
+    for global_config in GlobalConfig.objects.all():
+        data = global_config.data or {}
+        ssh = data.get("ssh") or {}
+        rsync = data.get("rsync") or {}
+        defaults = data.get("defaults") or {}
+        retention = data.get("retention_defaults") or {}
+
+        global_config.ssh_user = ssh.get("user") or global_config.ssh_user
+        global_config.ssh_port = ssh.get("port") or global_config.ssh_port
+        global_config.ssh_options = ssh.get("options") or []
+        global_config.rsync_binary = rsync.get("binary") or global_config.rsync_binary
+        global_config.rsync_args = rsync.get("args") or []
+        global_config.rsync_extra_args = rsync.get("extra_args") or []
+        global_config.rsync_timeout_seconds = rsync.get("timeout_seconds") or 0
+        global_config.rsync_bwlimit_kbps = rsync.get("bwlimit_kbps") or 0
+        global_config.default_source_root = defaults.get("source_root") or "/"
+        global_config.default_destination_subdir = defaults.get("destination_subdir") or ""
+        global_config.excludes_default = data.get("excludes_default") or []
+        global_config.retention_daily = retention.get("daily", global_config.retention_daily)
+        global_config.retention_weekly = retention.get("weekly", global_config.retention_weekly)
+        global_config.retention_monthly = retention.get("monthly", global_config.retention_monthly)
+        global_config.retention_yearly = retention.get("yearly", global_config.retention_yearly)
+        global_config.save()
+
+    for host_config in HostConfig.objects.all():
+        config = host_config.config or {}
+        ssh = config.get("ssh") or {}
+        rsync = config.get("rsync") or {}
+        retention = config.get("retention") or {}
+
+        host_config.ssh_user = ssh.get("user") or ""
+        host_config.ssh_port = ssh.get("port")
+        host_config.source_root = config.get("source_root") or ""
+        host_config.includes = config.get("includes") or []
+        host_config.excludes_add = config.get("excludes_add") or []
+        host_config.excludes_replace = config.get("excludes_replace")
+        host_config.rsync_extra_args = rsync.get("extra_args") or []
+        host_config.retention_daily = retention.get("daily", host_config.retention_daily)
+        host_config.retention_weekly = retention.get("weekly", host_config.retention_weekly)
+        host_config.retention_monthly = retention.get("monthly", host_config.retention_monthly)
+        host_config.retention_yearly = retention.get("yearly", host_config.retention_yearly)
+        host_config.save()
+
+
+class Migration(migrations.Migration):
+    dependencies = [
+        ("pobsync_backend", "0002_schedule_run_state"),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name="globalconfig",
+            name="default_destination_subdir",
+            field=models.CharField(blank=True, default="", max_length=512),
+        ),
+        migrations.AddField(
+            model_name="globalconfig",
+            name="default_source_root",
+            field=models.CharField(default="/", max_length=512),
+        ),
+        migrations.AddField(
+            model_name="globalconfig",
+            name="excludes_default",
+            field=models.JSONField(blank=True, default=list),
+        ),
+        migrations.AddField(
+            model_name="globalconfig",
+            name="retention_daily",
+            field=models.PositiveIntegerField(default=14),
+        ),
+        migrations.AddField(
+            model_name="globalconfig",
+            name="retention_monthly",
+            field=models.PositiveIntegerField(default=12),
+        ),
+        migrations.AddField(
+            model_name="globalconfig",
+            name="retention_weekly",
+            field=models.PositiveIntegerField(default=8),
+        ),
+        migrations.AddField(
+            model_name="globalconfig",
+            name="retention_yearly",
+            field=models.PositiveIntegerField(default=0),
+        ),
+        migrations.AddField(
+            model_name="globalconfig",
+            name="rsync_args",
+            field=models.JSONField(blank=True, default=list),
+        ),
+        migrations.AddField(
+            model_name="globalconfig",
+            name="rsync_binary",
+            field=models.CharField(default="rsync", max_length=128),
+        ),
+        migrations.AddField(
+            model_name="globalconfig",
+            name="rsync_bwlimit_kbps",
+            field=models.PositiveIntegerField(default=0),
+        ),
+        migrations.AddField(
+            model_name="globalconfig",
+            name="rsync_extra_args",
+            field=models.JSONField(blank=True, default=list),
+        ),
+        migrations.AddField(
+            model_name="globalconfig",
+            name="rsync_timeout_seconds",
+            field=models.PositiveIntegerField(default=0),
+        ),
+        migrations.AddField(
+            model_name="globalconfig",
+            name="ssh_options",
+            field=models.JSONField(blank=True, default=list),
+        ),
+        migrations.AddField(
+            model_name="globalconfig",
+            name="ssh_port",
+            field=models.PositiveIntegerField(default=22),
+        ),
+        migrations.AddField(
+            model_name="globalconfig",
+            name="ssh_user",
+            field=models.CharField(default="root", max_length=64),
+        ),
+        migrations.AddField(
+            model_name="hostconfig",
+            name="excludes_add",
+            field=models.JSONField(blank=True, default=list),
+        ),
+        migrations.AddField(
+            model_name="hostconfig",
+            name="excludes_replace",
+            field=models.JSONField(blank=True, null=True),
+        ),
+        migrations.AddField(
+            model_name="hostconfig",
+            name="includes",
+            field=models.JSONField(blank=True, default=list),
+        ),
+        migrations.AddField(
+            model_name="hostconfig",
+            name="retention_daily",
+            field=models.PositiveIntegerField(default=14),
+        ),
+        migrations.AddField(
+            model_name="hostconfig",
+            name="retention_monthly",
+            field=models.PositiveIntegerField(default=12),
+        ),
+        migrations.AddField(
+            model_name="hostconfig",
+            name="retention_weekly",
+            field=models.PositiveIntegerField(default=8),
+        ),
+        migrations.AddField(
+            model_name="hostconfig",
+            name="retention_yearly",
+            field=models.PositiveIntegerField(default=0),
+        ),
+        migrations.AddField(
+            model_name="hostconfig",
+            name="rsync_extra_args",
+            field=models.JSONField(blank=True, default=list),
+        ),
+        migrations.AddField(
+            model_name="hostconfig",
+            name="source_root",
+            field=models.CharField(blank=True, max_length=512),
+        ),
+        migrations.AddField(
+            model_name="hostconfig",
+            name="ssh_port",
+            field=models.PositiveIntegerField(blank=True, null=True),
+        ),
+        migrations.AddField(
+            model_name="hostconfig",
+            name="ssh_user",
+            field=models.CharField(blank=True, max_length=64),
+        ),
+        migrations.RunPython(copy_json_config_to_fields, migrations.RunPython.noop),
+    ]

src/pobsync_backend/migrations/0004_backuprun_snapshot.py

@@ -0,0 +1,24 @@
+from __future__ import annotations
+
+import django.db.models.deletion
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+    dependencies = [
+        ("pobsync_backend", "0003_structured_config_fields"),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name="backuprun",
+            name="snapshot",
+            field=models.ForeignKey(
+                blank=True,
+                null=True,
+                on_delete=django.db.models.deletion.SET_NULL,
+                related_name="backup_runs",
+                to="pobsync_backend.snapshotrecord",
+            ),
+        ),
+    ]

src/pobsync_backend/migrations/0005_snapshotrecord_base.py

@@ -0,0 +1,44 @@
+from __future__ import annotations
+
+import django.db.models.deletion
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+    dependencies = [
+        ("pobsync_backend", "0004_backuprun_snapshot"),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name="snapshotrecord",
+            name="base",
+            field=models.ForeignKey(
+                blank=True,
+                null=True,
+                on_delete=django.db.models.deletion.SET_NULL,
+                related_name="derived_snapshots",
+                to="pobsync_backend.snapshotrecord",
+            ),
+        ),
+        migrations.AddField(
+            model_name="snapshotrecord",
+            name="base_dirname",
+            field=models.CharField(blank=True, max_length=255),
+        ),
+        migrations.AddField(
+            model_name="snapshotrecord",
+            name="base_snapshot_id",
+            field=models.CharField(blank=True, max_length=64),
+        ),
+        migrations.AddField(
+            model_name="snapshotrecord",
+            name="base_kind",
+            field=models.CharField(blank=True, max_length=16),
+        ),
+        migrations.AddField(
+            model_name="snapshotrecord",
+            name="base_path",
+            field=models.CharField(blank=True, max_length=1024),
+        ),
+    ]

src/pobsync_backend/migrations/0006_ssh_credentials.py

@@ -0,0 +1,51 @@
+# Generated by Django 5.2.14 on 2026-05-19
+
+import django.db.models.deletion
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+    dependencies = [
+        ("pobsync_backend", "0005_snapshotrecord_base"),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name="SshCredential",
+            fields=[
+                ("id", models.BigAutoField(auto_created=True, primary_key=True, serialize=False, verbose_name="ID")),
+                ("created_at", models.DateTimeField(auto_now_add=True)),
+                ("updated_at", models.DateTimeField(auto_now=True)),
+                ("name", models.CharField(max_length=128, unique=True)),
+                ("private_key", models.TextField()),
+                ("public_key", models.TextField(blank=True)),
+                ("known_hosts", models.TextField(blank=True)),
+                ("notes", models.TextField(blank=True)),
+            ],
+            options={
+                "ordering": ["name"],
+            },
+        ),
+        migrations.AddField(
+            model_name="globalconfig",
+            name="default_ssh_credential",
+            field=models.ForeignKey(
+                blank=True,
+                null=True,
+                on_delete=django.db.models.deletion.SET_NULL,
+                related_name="global_configs",
+                to="pobsync_backend.sshcredential",
+            ),
+        ),
+        migrations.AddField(
+            model_name="hostconfig",
+            name="ssh_credential",
+            field=models.ForeignKey(
+                blank=True,
+                null=True,
+                on_delete=django.db.models.deletion.SET_NULL,
+                related_name="hosts",
+                to="pobsync_backend.sshcredential",
+            ),
+        ),
+    ]

src/pobsync_backend/migrations/0007_filesystem_ssh_credentials.py

@@ -0,0 +1,35 @@
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+    dependencies = [
+        ("pobsync_backend", "0006_ssh_credentials"),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name="sshcredential",
+            name="private_key",
+            field=models.TextField(blank=True, default=""),
+        ),
+        migrations.AddField(
+            model_name="sshcredential",
+            name="key_path",
+            field=models.CharField(blank=True, max_length=1024),
+        ),
+        migrations.AddField(
+            model_name="sshcredential",
+            name="key_type",
+            field=models.CharField(default="ed25519", max_length=32),
+        ),
+        migrations.AddField(
+            model_name="sshcredential",
+            name="fingerprint",
+            field=models.CharField(blank=True, max_length=255),
+        ),
+        migrations.AddField(
+            model_name="sshcredential",
+            name="generated",
+            field=models.BooleanField(default=False),
+        ),
+    ]

src/pobsync_backend/migrations/0008_alter_backuprun_status.py

@@ -0,0 +1,27 @@
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("pobsync_backend", "0007_filesystem_ssh_credentials"),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name="backuprun",
+            name="status",
+            field=models.CharField(
+                choices=[
+                    ("queued", "Queued"),
+                    ("running", "Running"),
+                    ("success", "Success"),
+                    ("warning", "Warning"),
+                    ("failed", "Failed"),
+                    ("cancelled", "Cancelled"),
+                ],
+                default="queued",
+                max_length=16,
+            ),
+        ),
+    ]

src/pobsync_backend/migrations/0009_remove_scheduleconfig_user.py

@@ -0,0 +1,14 @@
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+    dependencies = [
+        ("pobsync_backend", "0008_alter_backuprun_status"),
+    ]
+
+    operations = [
+        migrations.RemoveField(
+            model_name="scheduleconfig",
+            name="user",
+        ),
+    ]

src/pobsync_backend/migrations/0010_remove_globalconfig_pobsync_home.py

@@ -0,0 +1,14 @@
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+    dependencies = [
+        ("pobsync_backend", "0009_remove_scheduleconfig_user"),
+    ]
+
+    operations = [
+        migrations.RemoveField(
+            model_name="globalconfig",
+            name="pobsync_home",
+        ),
+    ]

src/pobsync_backend/migrations/0011_remove_globalconfig_data.py

@@ -0,0 +1,14 @@
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+    dependencies = [
+        ("pobsync_backend", "0010_remove_globalconfig_pobsync_home"),
+    ]
+
+    operations = [
+        migrations.RemoveField(
+            model_name="globalconfig",
+            name="data",
+        ),
+    ]

src/pobsync_backend/migrations/0012_review_state.py

@@ -0,0 +1,30 @@
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+    dependencies = [
+        ("pobsync_backend", "0011_remove_globalconfig_data"),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name="backuprun",
+            name="reviewed_at",
+            field=models.DateTimeField(blank=True, null=True),
+        ),
+        migrations.AddField(
+            model_name="backuprun",
+            name="reviewed_by",
+            field=models.CharField(blank=True, max_length=150),
+        ),
+        migrations.AddField(
+            model_name="snapshotrecord",
+            name="reviewed_at",
+            field=models.DateTimeField(blank=True, null=True),
+        ),
+        migrations.AddField(
+            model_name="snapshotrecord",
+            name="reviewed_by",
+            field=models.CharField(blank=True, max_length=150),
+        ),
+    ]

src/pobsync_backend/migrations/0013_purgedsnapshot.py

@@ -0,0 +1,50 @@
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+    dependencies = [
+        ("pobsync_backend", "0012_review_state"),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name="PurgedSnapshot",
+            fields=[
+                ("id", models.BigAutoField(auto_created=True, primary_key=True, serialize=False, verbose_name="ID")),
+                ("host_name", models.CharField(max_length=255)),
+                ("kind", models.CharField(max_length=16)),
+                ("dirname", models.CharField(max_length=255)),
+                ("path", models.CharField(max_length=1024)),
+                ("reason", models.CharField(blank=True, max_length=512)),
+                (
+                    "action",
+                    models.CharField(
+                        choices=[
+                            ("manual", "Manual"),
+                            ("scheduled", "Scheduled"),
+                            ("cli", "CLI"),
+                            ("incomplete_cleanup", "Incomplete cleanup"),
+                        ],
+                        max_length=32,
+                    ),
+                ),
+                ("triggered_by", models.CharField(blank=True, max_length=150)),
+                ("metadata", models.JSONField(blank=True, default=dict)),
+                ("purged_at", models.DateTimeField(auto_now_add=True)),
+                (
+                    "host",
+                    models.ForeignKey(
+                        blank=True,
+                        null=True,
+                        on_delete=django.db.models.deletion.SET_NULL,
+                        related_name="purged_snapshots",
+                        to="pobsync_backend.hostconfig",
+                    ),
+                ),
+            ],
+            options={
+                "ordering": ["-purged_at", "host_name", "dirname"],
+            },
+        ),
+    ]

src/pobsync_backend/migrations/__init__.py

@@ -0,0 +1 @@
+

src/pobsync_backend/models.py

@@ -0,0 +1,217 @@
+from __future__ import annotations
+
+from django.db import models
+
+
+class TimestampedModel(models.Model):
+    created_at = models.DateTimeField(auto_now_add=True)
+    updated_at = models.DateTimeField(auto_now=True)
+
+    class Meta:
+        abstract = True
+
+
+class GlobalConfig(TimestampedModel):
+    name = models.CharField(max_length=64, default="default", unique=True)
+    backup_root = models.CharField(max_length=512)
+    default_ssh_credential = models.ForeignKey(
+        "SshCredential",
+        on_delete=models.SET_NULL,
+        null=True,
+        blank=True,
+        related_name="global_configs",
+    )
+    ssh_user = models.CharField(max_length=64, default="root")
+    ssh_port = models.PositiveIntegerField(default=22)
+    ssh_options = models.JSONField(default=list, blank=True)
+    rsync_binary = models.CharField(max_length=128, default="rsync")
+    rsync_args = models.JSONField(default=list, blank=True)
+    rsync_extra_args = models.JSONField(default=list, blank=True)
+    rsync_timeout_seconds = models.PositiveIntegerField(default=0)
+    rsync_bwlimit_kbps = models.PositiveIntegerField(default=0)
+    default_source_root = models.CharField(max_length=512, default="/")
+    default_destination_subdir = models.CharField(max_length=512, default="", blank=True)
+    excludes_default = models.JSONField(default=list, blank=True)
+    retention_daily = models.PositiveIntegerField(default=14)
+    retention_weekly = models.PositiveIntegerField(default=8)
+    retention_monthly = models.PositiveIntegerField(default=12)
+    retention_yearly = models.PositiveIntegerField(default=0)
+
+    class Meta:
+        verbose_name = "global config"
+        verbose_name_plural = "global configs"
+
+    def __str__(self) -> str:
+        return self.name
+
+
+class HostConfig(TimestampedModel):
+    host = models.CharField(max_length=255, unique=True)
+    address = models.CharField(max_length=255)
+    enabled = models.BooleanField(default=True)
+    ssh_credential = models.ForeignKey(
+        "SshCredential",
+        on_delete=models.SET_NULL,
+        null=True,
+        blank=True,
+        related_name="hosts",
+    )
+    ssh_user = models.CharField(max_length=64, blank=True)
+    ssh_port = models.PositiveIntegerField(null=True, blank=True)
+    source_root = models.CharField(max_length=512, blank=True)
+    includes = models.JSONField(default=list, blank=True)
+    excludes_add = models.JSONField(default=list, blank=True)
+    excludes_replace = models.JSONField(null=True, blank=True)
+    rsync_extra_args = models.JSONField(default=list, blank=True)
+    retention_daily = models.PositiveIntegerField(default=14)
+    retention_weekly = models.PositiveIntegerField(default=8)
+    retention_monthly = models.PositiveIntegerField(default=12)
+    retention_yearly = models.PositiveIntegerField(default=0)
+    config = models.JSONField(default=dict, blank=True)
+
+    class Meta:
+        ordering = ["host"]
+
+    def __str__(self) -> str:
+        return self.host
+
+
+class SshCredential(TimestampedModel):
+    name = models.CharField(max_length=128, unique=True)
+    private_key = models.TextField(blank=True, default="")
+    public_key = models.TextField(blank=True)
+    key_path = models.CharField(max_length=1024, blank=True)
+    key_type = models.CharField(max_length=32, default="ed25519")
+    fingerprint = models.CharField(max_length=255, blank=True)
+    generated = models.BooleanField(default=False)
+    known_hosts = models.TextField(blank=True)
+    notes = models.TextField(blank=True)
+
+    class Meta:
+        ordering = ["name"]
+
+    def __str__(self) -> str:
+        return self.name
+
+
+class BackupRun(models.Model):
+    class RunType(models.TextChoices):
+        SCHEDULED = "scheduled", "Scheduled"
+        MANUAL = "manual", "Manual"
+
+    class Status(models.TextChoices):
+        QUEUED = "queued", "Queued"
+        RUNNING = "running", "Running"
+        SUCCESS = "success", "Success"
+        WARNING = "warning", "Warning"
+        FAILED = "failed", "Failed"
+        CANCELLED = "cancelled", "Cancelled"
+
+    host = models.ForeignKey(HostConfig, on_delete=models.PROTECT, related_name="runs")
+    run_type = models.CharField(max_length=16, choices=RunType.choices, default=RunType.SCHEDULED)
+    status = models.CharField(max_length=16, choices=Status.choices, default=Status.QUEUED)
+    started_at = models.DateTimeField(null=True, blank=True)
+    ended_at = models.DateTimeField(null=True, blank=True)
+    snapshot_path = models.CharField(max_length=1024, blank=True)
+    snapshot = models.ForeignKey(
+        "SnapshotRecord",
+        on_delete=models.SET_NULL,
+        null=True,
+        blank=True,
+        related_name="backup_runs",
+    )
+    base_path = models.CharField(max_length=1024, blank=True)
+    rsync_exit_code = models.IntegerField(null=True, blank=True)
+    result = models.JSONField(default=dict, blank=True)
+    created_at = models.DateTimeField(auto_now_add=True)
+    reviewed_at = models.DateTimeField(null=True, blank=True)
+    reviewed_by = models.CharField(max_length=150, blank=True)
+
+    class Meta:
+        ordering = ["-created_at"]
+
+    def __str__(self) -> str:
+        return f"{self.host} {self.run_type} {self.status}"
+
+
+class SnapshotRecord(models.Model):
+    class Kind(models.TextChoices):
+        SCHEDULED = "scheduled", "Scheduled"
+        MANUAL = "manual", "Manual"
+        INCOMPLETE = "incomplete", "Incomplete"
+
+    host = models.ForeignKey(HostConfig, on_delete=models.CASCADE, related_name="snapshots")
+    kind = models.CharField(max_length=16, choices=Kind.choices)
+    dirname = models.CharField(max_length=255)
+    path = models.CharField(max_length=1024)
+    base = models.ForeignKey(
+        "self",
+        on_delete=models.SET_NULL,
+        null=True,
+        blank=True,
+        related_name="derived_snapshots",
+    )
+    base_kind = models.CharField(max_length=16, blank=True)
+    base_dirname = models.CharField(max_length=255, blank=True)
+    base_path = models.CharField(max_length=1024, blank=True)
+    base_snapshot_id = models.CharField(max_length=64, blank=True)
+    status = models.CharField(max_length=32, blank=True)
+    started_at = models.DateTimeField(null=True, blank=True)
+    ended_at = models.DateTimeField(null=True, blank=True)
+    metadata = models.JSONField(default=dict, blank=True)
+    discovered_at = models.DateTimeField(auto_now_add=True)
+    reviewed_at = models.DateTimeField(null=True, blank=True)
+    reviewed_by = models.CharField(max_length=150, blank=True)
+
+    class Meta:
+        constraints = [
+            models.UniqueConstraint(fields=["host", "kind", "dirname"], name="unique_snapshot_per_host_kind"),
+        ]
+        ordering = ["host__host", "-started_at", "dirname"]
+
+    def __str__(self) -> str:
+        return f"{self.host}/{self.kind}/{self.dirname}"
+
+
+class PurgedSnapshot(models.Model):
+    class Action(models.TextChoices):
+        MANUAL = "manual", "Manual"
+        SCHEDULED = "scheduled", "Scheduled"
+        CLI = "cli", "CLI"
+        INCOMPLETE_CLEANUP = "incomplete_cleanup", "Incomplete cleanup"
+
+    host = models.ForeignKey(HostConfig, on_delete=models.SET_NULL, null=True, blank=True, related_name="purged_snapshots")
+    host_name = models.CharField(max_length=255)
+    kind = models.CharField(max_length=16)
+    dirname = models.CharField(max_length=255)
+    path = models.CharField(max_length=1024)
+    reason = models.CharField(max_length=512, blank=True)
+    action = models.CharField(max_length=32, choices=Action.choices)
+    triggered_by = models.CharField(max_length=150, blank=True)
+    metadata = models.JSONField(default=dict, blank=True)
+    purged_at = models.DateTimeField(auto_now_add=True)
+
+    class Meta:
+        ordering = ["-purged_at", "host_name", "dirname"]
+
+    def __str__(self) -> str:
+        return f"{self.host_name}/{self.kind}/{self.dirname}"
+
+
+class ScheduleConfig(TimestampedModel):
+    host = models.OneToOneField(HostConfig, on_delete=models.CASCADE, related_name="schedule")
+    cron_expr = models.CharField(max_length=128)
+    enabled = models.BooleanField(default=True)
+    prune = models.BooleanField(default=False)
+    prune_max_delete = models.PositiveIntegerField(default=10)
+    prune_protect_bases = models.BooleanField(default=False)
+    last_due_key = models.CharField(max_length=32, blank=True)
+    last_started_at = models.DateTimeField(null=True, blank=True)
+    last_finished_at = models.DateTimeField(null=True, blank=True)
+    last_status = models.CharField(max_length=16, blank=True)
+
+    class Meta:
+        ordering = ["host__host"]
+
+    def __str__(self) -> str:
+        return f"{self.host} {self.cron_expr}"

src/pobsync_backend/preflight.py

@@ -0,0 +1,232 @@
+from __future__ import annotations
+
+import shlex
+import subprocess
+from dataclasses import dataclass
+from typing import Any
+
+from pobsync.config.merge import build_effective_config
+from pobsync.rsync import build_ssh_command
+
+from .config_repository import global_config_object_data, host_config_object_data
+from .config_source import DjangoConfigSource
+from .host_ops import collect_host_checks
+from .models import GlobalConfig, HostConfig
+from .self_check import SelfCheck
+
+
+DRY_RUN_BLOCKING_CHECKS = {
+    "Host global config",
+    "Host address",
+    "Host SSH key file",
+    "Host effective source root",
+    "Host effective SSH user",
+    "Host effective SSH port",
+    "Host effective SSH credential",
+    "Host effective rsync recursion",
+}
+
+
+@dataclass(frozen=True)
+class BackupGate:
+    state: str
+    message: str
+    checks: list[SelfCheck]
+    real_blockers: list[SelfCheck]
+    dry_run_blockers: list[SelfCheck]
+    warnings: list[SelfCheck]
+
+    @property
+    def can_queue_real(self) -> bool:
+        return not self.real_blockers
+
+    @property
+    def can_queue_dry_run(self) -> bool:
+        return not self.dry_run_blockers
+
+
+def collect_backup_gate(host: HostConfig, global_config: GlobalConfig | None = None) -> BackupGate:
+    checks = collect_host_checks(host, global_config)
+    remote_preflight_check = _remote_preflight_self_check(host)
+    if remote_preflight_check is not None:
+        checks.append(remote_preflight_check)
+    real_blockers = [check for check in checks if check.status == "failed"]
+    dry_run_blockers = [check for check in real_blockers if check.name in DRY_RUN_BLOCKING_CHECKS]
+    warnings = [check for check in checks if check.status == "warning"]
+
+    if real_blockers:
+        state = "blocked"
+        message = "Real backups are blocked until failed host checks are resolved."
+    elif warnings:
+        state = "warning"
+        message = "Backups can run, but review the warnings first."
+    else:
+        state = "ready"
+        message = "This host is ready for backup runs."
+
+    return BackupGate(
+        state=state,
+        message=message,
+        checks=checks,
+        real_blockers=real_blockers,
+        dry_run_blockers=dry_run_blockers,
+        warnings=warnings,
+    )
+
+
+def run_remote_preflight(host: HostConfig, *, timeout_seconds: int = 20) -> dict[str, Any]:
+    config = DjangoConfigSource().effective_config_for_host(host.host)
+    ssh_cfg = config.get("ssh", {}) or {}
+    rsync_cfg = config.get("rsync", {}) or {}
+    address = str(config.get("address") or host.address)
+    user = str(ssh_cfg.get("user") or "root")
+    source_root = str(config.get("source_root") or (config.get("defaults", {}) or {}).get("source_root") or "/")
+    rsync_binary = str(rsync_cfg.get("binary") or "rsync")
+    target = f"{user}@{address}"
+    ssh_cmd = build_ssh_command(ssh_cfg)
+
+    checks = [
+        _run_remote_check(
+            name="SSH reachability",
+            command=[*ssh_cmd, "-oBatchMode=yes", target, "true"],
+            timeout_seconds=timeout_seconds,
+        ),
+        _run_remote_check(
+            name="Remote rsync",
+            command=[
+                *ssh_cmd,
+                "-oBatchMode=yes",
+                target,
+                "sh",
+                "-lc",
+                f"command -v {shlex.quote(rsync_binary)} >/dev/null",
+            ],
+            timeout_seconds=timeout_seconds,
+        ),
+        _run_remote_check(
+            name="Remote source root",
+            command=[
+                *ssh_cmd,
+                "-oBatchMode=yes",
+                target,
+                "sh",
+                "-lc",
+                f"test -e {shlex.quote(source_root)} && test -r {shlex.quote(source_root)}",
+            ],
+            timeout_seconds=timeout_seconds,
+        ),
+    ]
+    result = {
+        "ok": all(check["ok"] for check in checks),
+        "checks": checks,
+        "target": target,
+        "source_root": source_root,
+        "rsync_binary": rsync_binary,
+        "timeout_seconds": timeout_seconds,
+    }
+    host.config = {**(host.config or {}), "last_preflight": result}
+    host.save(update_fields=["config", "updated_at"])
+    return result
+
+
+def effective_host_config_preview(host: HostConfig, global_config: GlobalConfig) -> dict[str, Any]:
+    config = build_effective_config(global_config_object_data(global_config), host_config_object_data(host))
+    credential = host.ssh_credential or global_config.default_ssh_credential
+    ssh = config.get("ssh", {}) or {}
+    rsync = config.get("rsync", {}) or {}
+    retention = config.get("retention", {}) or {}
+
+    return {
+        "source_root": config.get("source_root", ""),
+        "destination_subdir": (config.get("defaults", {}) or {}).get("destination_subdir", ""),
+        "includes": list(config.get("includes") or []),
+        "excludes": list(config.get("excludes_effective") or []),
+        "ssh": {
+            "user": ssh.get("user", ""),
+            "port": ssh.get("port", ""),
+            "options": list(ssh.get("options") or []),
+            "credential": str(credential) if credential else "",
+        },
+        "rsync": {
+            "binary": rsync.get("binary", ""),
+            "args": list(rsync.get("args_effective") or []),
+            "timeout_seconds": rsync.get("timeout_seconds", 0),
+            "bwlimit_kbps": rsync.get("bwlimit_kbps", 0),
+        },
+        "retention": {
+            "daily": retention.get("daily", 0),
+            "weekly": retention.get("weekly", 0),
+            "monthly": retention.get("monthly", 0),
+            "yearly": retention.get("yearly", 0),
+        },
+    }
+
+
+def _run_remote_check(*, name: str, command: list[str], timeout_seconds: int) -> dict[str, Any]:
+    try:
+        result = subprocess.run(
+            command,
+            check=False,
+            stdout=subprocess.PIPE,
+            stderr=subprocess.PIPE,
+            text=True,
+            timeout=timeout_seconds,
+        )
+    except subprocess.TimeoutExpired as exc:
+        return {
+            "name": name,
+            "ok": False,
+            "exit_code": 124,
+            "message": f"{name} timed out after {timeout_seconds}s.",
+            "detail": _clip_output((exc.stderr or exc.stdout or "").strip()),
+        }
+    except OSError as exc:
+        return {
+            "name": name,
+            "ok": False,
+            "exit_code": None,
+            "message": f"{name} could not start.",
+            "detail": str(exc),
+        }
+
+    return {
+        "name": name,
+        "ok": result.returncode == 0,
+        "exit_code": result.returncode,
+        "message": f"{name} passed." if result.returncode == 0 else f"{name} failed.",
+        "detail": _clip_output((result.stderr or result.stdout or "").strip()),
+    }
+
+
+def _remote_preflight_self_check(host: HostConfig) -> SelfCheck | None:
+    preflight = (host.config or {}).get("last_preflight")
+    if not isinstance(preflight, dict):
+        return SelfCheck(
+            "Remote preflight",
+            "warning",
+            "No remote connection preflight has been run yet.",
+            "Run connection preflight before the first real backup.",
+        )
+    checks = preflight.get("checks")
+    if not isinstance(checks, list):
+        return SelfCheck("Remote preflight", "failed", "Stored remote preflight result is invalid.")
+    failed = [str(check.get("name", "unknown")) for check in checks if isinstance(check, dict) and not check.get("ok")]
+    if failed:
+        return SelfCheck(
+            "Remote preflight",
+            "failed",
+            "Remote connection preflight failed.",
+            ", ".join(failed),
+        )
+    return SelfCheck(
+        "Remote preflight",
+        "ok",
+        "Remote connection preflight passed.",
+        f"{preflight.get('target', '')} {preflight.get('source_root', '')}".strip(),
+    )
+
+
+def _clip_output(value: str, *, max_chars: int = 800) -> str:
+    if len(value) <= max_chars:
+        return value
+    return f"{value[:max_chars]}..."

src/pobsync_backend/retention.py

@@ -0,0 +1,352 @@
+from __future__ import annotations
+
+import shutil
+import stat
+from datetime import datetime, timezone
+from pathlib import Path
+from typing import Any
+
+from pobsync.errors import ConfigError
+from pobsync.lock import acquire_host_lock
+from pobsync.paths import PobsyncPaths
+from pobsync.retention import Snapshot, apply_base_protection, build_retention_plan
+from pobsync.util import sanitize_host
+
+from .models import HostConfig, PurgedSnapshot, SnapshotRecord
+
+
+def run_sql_retention_plan(*, host: str, kind: str, protect_bases: bool) -> dict[str, Any]:
+    host = sanitize_host(host)
+    if kind not in {"scheduled", "manual", "all"}:
+        raise ConfigError("kind must be scheduled, manual, or all")
+
+    host_config = _enabled_host_config(host)
+    retention = _retention_for_host(host_config)
+    snapshots = _snapshots_for_retention(host_config=host_config, kind=kind)
+    incomplete_snapshots = _incomplete_snapshots_for_host(host_config)
+
+    plan = build_retention_plan(
+        snapshots=snapshots,
+        retention=retention,
+        now=datetime.now(timezone.utc),
+    )
+
+    keep = set(plan.keep)
+    reasons = dict(plan.reasons)
+    if protect_bases:
+        keep, reasons = apply_base_protection(snapshots=snapshots, keep=keep, reasons=reasons)
+
+    delete = [snapshot for snapshot in snapshots if snapshot.dirname not in keep]
+    keep_items = [snapshot for snapshot in snapshots if snapshot.dirname in keep]
+
+    return {
+        "ok": True,
+        "host": host,
+        "kind": kind,
+        "protect_bases": bool(protect_bases),
+        "retention": retention,
+        "source": "sql",
+        "keep": sorted(keep),
+        "keep_items": [_snapshot_to_item(snapshot, reasons=reasons.get(snapshot.dirname, [])) for snapshot in keep_items],
+        "delete": [_snapshot_to_item(snapshot, reasons=["outside retention policy"]) for snapshot in delete],
+        "incomplete": [
+            _snapshot_to_item(snapshot, reasons=["incomplete snapshot; excluded from retention cleanup"])
+            for snapshot in incomplete_snapshots
+        ],
+        "reasons": reasons,
+    }
+
+
+def run_sql_retention_apply(
+    *,
+    prefix: Path,
+    host: str,
+    kind: str,
+    protect_bases: bool,
+    yes: bool,
+    max_delete: int,
+    action: str = PurgedSnapshot.Action.MANUAL,
+    triggered_by: str = "",
+    acquire_lock: bool = True,
+) -> dict[str, Any]:
+    host = sanitize_host(host)
+    if not yes:
+        raise ConfigError("Refusing to delete snapshots without --yes")
+    if max_delete < 0:
+        raise ConfigError("--max-delete must be >= 0")
+
+    paths = PobsyncPaths(home=prefix)
+
+    def _do_apply() -> dict[str, Any]:
+        plan = run_sql_retention_plan(host=host, kind=kind, protect_bases=bool(protect_bases))
+        delete_list = plan.get("delete") or []
+        incomplete_list = plan.get("incomplete") or []
+        if not isinstance(delete_list, list):
+            raise ConfigError("Invalid retention plan output: delete is not a list")
+        if not isinstance(incomplete_list, list):
+            raise ConfigError("Invalid retention plan output: incomplete is not a list")
+        if max_delete == 0 and len(delete_list) > 0:
+            raise ConfigError("Deletion blocked by --max-delete=0")
+        if len(delete_list) > max_delete:
+            raise ConfigError(f"Refusing to delete {len(delete_list)} snapshots (exceeds --max-delete={max_delete})")
+
+        actions: list[str] = []
+        deleted: list[dict[str, Any]] = []
+
+        for item in delete_list:
+            dirname = item.get("dirname") if isinstance(item, dict) else None
+            snap_kind = item.get("kind") if isinstance(item, dict) else None
+            snap_path = item.get("path") if isinstance(item, dict) else None
+            if not isinstance(dirname, str) or not isinstance(snap_kind, str) or not isinstance(snap_path, str):
+                continue
+            if snap_kind not in {"scheduled", "manual"}:
+                raise ConfigError(f"Refusing to delete unsupported snapshot kind: {snap_kind!r}")
+
+            path = _snapshot_delete_path(path=Path(snap_path), dirname=dirname)
+            reason = str(item.get("reason") or "outside retention policy")
+            if not path.exists():
+                actions.append(f"skip missing {snap_kind}/{dirname}")
+                continue
+            if not path.is_dir():
+                raise ConfigError(f"Refusing to delete non-directory path: {path}")
+
+            _remove_snapshot_tree(path)
+            _record_purged_snapshot(
+                host_config=_enabled_host_config(host),
+                kind=snap_kind,
+                dirname=dirname,
+                path=path,
+                reason=reason,
+                action=action,
+                triggered_by=triggered_by,
+                metadata={"source": "retention", "protect_bases": bool(protect_bases), "retention_kind": kind},
+            )
+            SnapshotRecord.objects.filter(host__host=host, kind=snap_kind, dirname=dirname).delete()
+            actions.append(f"deleted {snap_kind} {dirname}")
+            deleted.append({"dirname": dirname, "kind": snap_kind, "path": str(path), "reason": reason})
+
+        return {
+            "ok": True,
+            "host": host,
+            "kind": kind,
+            "protect_bases": bool(protect_bases),
+            "max_delete": max_delete,
+            "source": "sql",
+            "planned_delete_count": len(delete_list),
+            "incomplete_ignored_count": len(incomplete_list),
+            "deleted": deleted,
+            "actions": actions,
+        }
+
+    if acquire_lock:
+        with acquire_host_lock(paths.locks_dir, host, command="retention-apply"):
+            return _do_apply()
+    return _do_apply()
+
+
+def run_incomplete_cleanup(
+    *,
+    prefix: Path,
+    host: str,
+    yes: bool,
+    max_delete: int,
+    triggered_by: str = "",
+    acquire_lock: bool = True,
+) -> dict[str, Any]:
+    host = sanitize_host(host)
+    if not yes:
+        raise ConfigError("Refusing to delete incomplete snapshots without --yes")
+    if max_delete < 0:
+        raise ConfigError("--max-delete must be >= 0")
+
+    paths = PobsyncPaths(home=prefix)
+
+    def _do_cleanup() -> dict[str, Any]:
+        host_config = _enabled_host_config(host)
+        incomplete_list = [
+            _snapshot_to_item(snapshot, reasons=["manual incomplete cleanup"])
+            for snapshot in _incomplete_snapshots_for_host(host_config)
+        ]
+        if max_delete == 0 and len(incomplete_list) > 0:
+            raise ConfigError("Incomplete cleanup blocked by --max-delete=0")
+        if len(incomplete_list) > max_delete:
+            raise ConfigError(
+                f"Refusing to delete {len(incomplete_list)} incomplete snapshots (exceeds --max-delete={max_delete})"
+            )
+
+        actions: list[str] = []
+        deleted: list[dict[str, Any]] = []
+
+        for item in incomplete_list:
+            dirname = item["dirname"]
+            snap_path = Path(item["path"])
+            path = _snapshot_delete_path(path=snap_path, dirname=dirname)
+            _validate_incomplete_delete_path(host=host, path=path, dirname=dirname)
+
+            if not path.exists():
+                actions.append(f"skip missing incomplete/{dirname}")
+            elif not path.is_dir():
+                raise ConfigError(f"Refusing to delete non-directory path: {path}")
+            else:
+                _remove_snapshot_tree(path)
+                actions.append(f"deleted incomplete {dirname}")
+
+            _record_purged_snapshot(
+                host_config=host_config,
+                kind=SnapshotRecord.Kind.INCOMPLETE,
+                dirname=dirname,
+                path=path,
+                reason="manual incomplete cleanup",
+                action=PurgedSnapshot.Action.INCOMPLETE_CLEANUP,
+                triggered_by=triggered_by,
+                metadata={"source": "incomplete_cleanup"},
+            )
+            SnapshotRecord.objects.filter(
+                host__host=host,
+                kind=SnapshotRecord.Kind.INCOMPLETE,
+                dirname=dirname,
+            ).delete()
+            deleted.append({"dirname": dirname, "kind": SnapshotRecord.Kind.INCOMPLETE, "path": str(path)})
+
+        return {
+            "ok": True,
+            "host": host,
+            "kind": SnapshotRecord.Kind.INCOMPLETE,
+            "max_delete": max_delete,
+            "source": "sql",
+            "planned_delete_count": len(incomplete_list),
+            "deleted": deleted,
+            "actions": actions,
+        }
+
+    if acquire_lock:
+        with acquire_host_lock(paths.locks_dir, host, command="incomplete-cleanup"):
+            return _do_cleanup()
+    return _do_cleanup()
+
+
+def _enabled_host_config(host: str) -> HostConfig:
+    try:
+        return HostConfig.objects.get(host=host, enabled=True)
+    except HostConfig.DoesNotExist as exc:
+        raise ConfigError(f"Missing enabled host {host!r}") from exc
+
+
+def _retention_for_host(host_config: HostConfig) -> dict[str, int]:
+    return {
+        "daily": host_config.retention_daily,
+        "weekly": host_config.retention_weekly,
+        "monthly": host_config.retention_monthly,
+        "yearly": host_config.retention_yearly,
+    }
+
+
+def _snapshots_for_retention(*, host_config: HostConfig, kind: str) -> list[Snapshot]:
+    kinds = ["scheduled", "manual"] if kind == "all" else [kind]
+    records = (
+        SnapshotRecord.objects.filter(host=host_config, kind__in=kinds)
+        .exclude(kind=SnapshotRecord.Kind.INCOMPLETE)
+        .select_related("base")
+        .order_by("-started_at", "dirname")
+    )
+    return [_snapshot_from_record(record) for record in records]
+
+
+def _incomplete_snapshots_for_host(host_config: HostConfig) -> list[Snapshot]:
+    records = (
+        SnapshotRecord.objects.filter(host=host_config, kind=SnapshotRecord.Kind.INCOMPLETE)
+        .select_related("base")
+        .order_by("-started_at", "dirname")
+    )
+    return [_snapshot_from_record(record) for record in records]
+
+
+def _snapshot_from_record(record: SnapshotRecord) -> Snapshot:
+    return Snapshot(
+        kind=record.kind,
+        dirname=record.dirname,
+        path=record.path,
+        dt=record.started_at or datetime.fromtimestamp(0, tz=timezone.utc),
+        status=record.status or None,
+        base=_base_meta_from_record(record),
+    )
+
+
+def _base_meta_from_record(record: SnapshotRecord) -> dict[str, str] | None:
+    if record.base is not None:
+        return {
+            "kind": record.base.kind,
+            "dirname": record.base.dirname,
+            "path": record.base.path,
+        }
+    if record.base_kind and record.base_dirname:
+        return {
+            "kind": record.base_kind,
+            "dirname": record.base_dirname,
+            "path": record.base_path,
+        }
+    return None
+
+
+def _snapshot_to_item(snapshot: Snapshot, *, reasons: list[str]) -> dict[str, Any]:
+    return {
+        "dirname": snapshot.dirname,
+        "kind": snapshot.kind,
+        "path": snapshot.path,
+        "dt": snapshot.dt.isoformat(),
+        "status": snapshot.status,
+        "reasons": reasons,
+        "reason": ", ".join(reasons),
+    }
+
+
+def _snapshot_delete_path(*, path: Path, dirname: str) -> Path:
+    if path.name == "data" and path.parent.name == dirname:
+        return path.parent
+    return path
+
+
+def _record_purged_snapshot(
+    *,
+    host_config: HostConfig,
+    kind: str,
+    dirname: str,
+    path: Path,
+    reason: str,
+    action: str,
+    triggered_by: str,
+    metadata: dict[str, Any],
+) -> None:
+    PurgedSnapshot.objects.create(
+        host=host_config,
+        host_name=host_config.host,
+        kind=kind,
+        dirname=dirname,
+        path=str(path),
+        reason=reason,
+        action=action,
+        triggered_by=triggered_by,
+        metadata=metadata,
+    )
+
+
+def _validate_incomplete_delete_path(*, host: str, path: Path, dirname: str) -> None:
+    path_parts = path.parts
+    if path.name != dirname or ".incomplete" not in path_parts or host not in path_parts:
+        raise ConfigError(f"Refusing to delete unexpected incomplete snapshot path: {path}")
+    incomplete_index = path_parts.index(".incomplete")
+    if incomplete_index == 0 or path_parts[incomplete_index - 1] != host:
+        raise ConfigError(f"Refusing to delete incomplete snapshot outside host backup root: {path}")
+
+
+def _remove_snapshot_tree(path: Path) -> None:
+    _make_directories_user_writable(path)
+    shutil.rmtree(path)
+
+
+def _make_directories_user_writable(path: Path) -> None:
+    for directory in [path, *[child for child in path.rglob("*") if child.is_dir() and not child.is_symlink()]]:
+        mode = directory.stat().st_mode
+        if mode & stat.S_IWUSR:
+            continue
+        directory.chmod(mode | stat.S_IWUSR)

src/pobsync_backend/scheduler.py

@@ -0,0 +1,99 @@
+from __future__ import annotations
+
+from dataclasses import dataclass
+from datetime import datetime, timedelta
+
+
+@dataclass(frozen=True)
+class CronSchedule:
+    minute: str
+    hour: str
+    day_of_month: str
+    month: str
+    day_of_week: str
+
+
+def parse_cron_expr(expr: str) -> CronSchedule:
+    parts = expr.strip().split()
+    if len(parts) != 5:
+        raise ValueError("cron expression must have exactly 5 fields")
+    return CronSchedule(*parts)
+
+
+def due_key(moment: datetime) -> str:
+    return moment.strftime("%Y%m%d%H%M")
+
+
+def is_due(expr: str, moment: datetime) -> bool:
+    schedule = parse_cron_expr(expr)
+    cron_dow = (moment.weekday() + 1) % 7
+    return (
+        _field_matches(schedule.minute, moment.minute, 0, 59)
+        and _field_matches(schedule.hour, moment.hour, 0, 23)
+        and _field_matches(schedule.day_of_month, moment.day, 1, 31)
+        and _field_matches(schedule.month, moment.month, 1, 12)
+        and _field_matches(schedule.day_of_week, cron_dow, 0, 7, sunday_alias=True)
+    )
+
+
+def next_due_after(expr: str, moment: datetime, *, max_days: int = 366) -> datetime | None:
+    parse_cron_expr(expr)
+    candidate = moment.replace(second=0, microsecond=0) + timedelta(minutes=1)
+    deadline = candidate + timedelta(days=max_days)
+    while candidate <= deadline:
+        if is_due(expr, candidate):
+            return candidate
+        candidate += timedelta(minutes=1)
+    return None
+
+
+def _field_matches(field: str, value: int, min_value: int, max_value: int, sunday_alias: bool = False) -> bool:
+    for part in field.split(","):
+        if _part_matches(part.strip(), value, min_value, max_value, sunday_alias=sunday_alias):
+            return True
+    return False
+
+
+def _part_matches(part: str, value: int, min_value: int, max_value: int, sunday_alias: bool) -> bool:
+    if not part:
+        return False
+
+    step = 1
+    base = part
+    if "/" in part:
+        base, step_s = part.split("/", 1)
+        if not step_s.isdigit():
+            return False
+        step = int(step_s)
+        if step <= 0:
+            return False
+
+    if base == "*":
+        start = min_value
+        end = max_value
+    elif "-" in base:
+        start_s, end_s = base.split("-", 1)
+        if not start_s.isdigit() or not end_s.isdigit():
+            return False
+        start = int(start_s)
+        end = int(end_s)
+    elif base.isdigit():
+        start = end = int(base)
+    else:
+        return False
+
+    values = _normalize_values(range(start, end + 1), sunday_alias=sunday_alias)
+    normalized_value = 0 if sunday_alias and value == 7 else value
+    if normalized_value not in values:
+        return False
+    return (normalized_value - min(values)) % step == 0
+
+
+def _normalize_values(values: range, sunday_alias: bool) -> set[int]:
+    out: set[int] = set()
+    for value in values:
+        if sunday_alias and value == 7:
+            out.add(0)
+        else:
+            out.add(value)
+    return out

src/pobsync_backend/self_check.py

@@ -0,0 +1,329 @@
+from __future__ import annotations
+
+import os
+import pwd
+import shutil
+import subprocess
+import sys
+from dataclasses import dataclass
+from pathlib import Path
+from typing import Literal
+
+from django.conf import settings
+from django.db import connection
+
+from .models import GlobalConfig
+
+
+CheckStatus = Literal["ok", "warning", "failed", "skipped"]
+
+
+@dataclass(frozen=True)
+class SelfCheck:
+    name: str
+    status: CheckStatus
+    message: str
+    detail: str = ""
+
+
+def collect_self_checks() -> list[SelfCheck]:
+    checks: list[SelfCheck] = []
+    checks.extend(_django_checks())
+    checks.extend(_install_checks())
+    checks.extend(_path_checks())
+    checks.extend(_binary_checks())
+    checks.extend(_database_checks())
+    checks.extend(_config_checks())
+    checks.extend(_systemd_checks())
+    return checks
+
+
+def _native_runtime_available() -> bool:
+    return Path("/run/systemd/system").exists() and shutil.which("systemctl") is not None
+
+
+def summarize_self_checks(checks: list[SelfCheck]) -> dict[str, int]:
+    return {
+        "ok": sum(1 for check in checks if check.status == "ok"),
+        "warning": sum(1 for check in checks if check.status == "warning"),
+        "failed": sum(1 for check in checks if check.status == "failed"),
+        "skipped": sum(1 for check in checks if check.status == "skipped"),
+    }
+
+
+def _django_checks() -> list[SelfCheck]:
+    checks = [
+        SelfCheck(
+            "Django debug",
+            "warning" if settings.DEBUG else "ok",
+            "DEBUG is enabled." if settings.DEBUG else "DEBUG is disabled.",
+        ),
+        SelfCheck(
+            "Django secret key",
+            "failed" if settings.SECRET_KEY == "dev-only-change-me" else "ok",
+            "Default development secret key is still active."
+            if settings.SECRET_KEY == "dev-only-change-me"
+            else "Secret key is configured.",
+        ),
+        SelfCheck(
+            "Allowed hosts",
+            "ok" if settings.ALLOWED_HOSTS else "failed",
+            ", ".join(settings.ALLOWED_HOSTS) if settings.ALLOWED_HOSTS else "No allowed hosts configured.",
+        ),
+    ]
+    return checks
+
+
+def _path_checks() -> list[SelfCheck]:
+    checks = []
+    checks.append(
+        _path_check(
+            "State root",
+            Path(settings.POBSYNC_HOME),
+            must_be_absolute=True,
+            must_be_writable=True,
+        )
+    )
+    checks.append(
+        _path_check(
+            "Backup root",
+            Path(settings.POBSYNC_BACKUP_ROOT),
+            must_be_absolute=True,
+            must_exist=True,
+            must_be_writable=True,
+        )
+    )
+    checks.append(
+        _path_check(
+            "Static root",
+            Path(settings.STATIC_ROOT),
+            must_be_absolute=True,
+            must_exist=False,
+            must_be_writable=True,
+        )
+    )
+    db_settings = settings.DATABASES["default"]
+    if db_settings["ENGINE"] == "django.db.backends.sqlite3":
+        sqlite_path = Path(str(db_settings["NAME"]))
+        checks.append(
+            _path_check(
+                "SQLite directory",
+                sqlite_path.parent,
+                must_be_absolute=True,
+                must_exist=True,
+                must_be_writable=True,
+            )
+        )
+        checks.append(_sqlite_database_check(sqlite_path))
+    return checks
+
+
+def _install_checks() -> list[SelfCheck]:
+    if not _native_runtime_available() and not Path(settings.POBSYNC_ENV_FILE).exists():
+        return [
+            SelfCheck(
+                "Environment file",
+                "skipped",
+                "Native environment file is not configured in this runtime.",
+                "This is expected inside Docker or local development.",
+            ),
+            SelfCheck(
+                "Service user",
+                "skipped",
+                "Native service user check is not available in this runtime.",
+                "This is expected inside Docker or local development.",
+            ),
+            SelfCheck(
+                "Backup root owner",
+                "skipped",
+                "Native backup root ownership check is not available in this runtime.",
+                "This is expected inside Docker or local development.",
+            ),
+        ]
+
+    checks = [_env_file_check(Path(settings.POBSYNC_ENV_FILE)), _service_user_check()]
+    checks.append(_backup_root_owner_check(Path(settings.POBSYNC_BACKUP_ROOT)))
+    return checks
+
+
+def _env_file_check(path: Path) -> SelfCheck:
+    if not path.is_absolute():
+        return SelfCheck("Environment file", "failed", f"{path} is not absolute.")
+    if not path.exists():
+        return SelfCheck("Environment file", "failed", f"{path} does not exist.")
+    if not path.is_file():
+        return SelfCheck("Environment file", "failed", f"{path} is not a regular file.")
+    if not os.access(path, os.R_OK):
+        return SelfCheck("Environment file", "failed", f"{path} is not readable by this process.")
+    return SelfCheck("Environment file", "ok", str(path))
+
+
+def _service_user_check() -> SelfCheck:
+    expected_user = settings.POBSYNC_SERVICE_USER
+    try:
+        current_user = pwd.getpwuid(os.geteuid()).pw_name
+    except KeyError:
+        return SelfCheck("Service user", "failed", f"Current uid {os.geteuid()} has no passwd entry.")
+    if current_user != expected_user:
+        return SelfCheck(
+            "Service user",
+            "warning",
+            f"Current process runs as {current_user}, expected {expected_user}.",
+            "Run terminal checks with sudo -u <service-user> pobsync-manage check_pobsync_install.",
+        )
+    return SelfCheck("Service user", "ok", current_user)
+
+
+def _backup_root_owner_check(path: Path) -> SelfCheck:
+    if not path.exists():
+        return SelfCheck("Backup root owner", "failed", f"{path} does not exist.")
+    expected_user = settings.POBSYNC_SERVICE_USER
+    try:
+        owner = pwd.getpwuid(path.stat().st_uid).pw_name
+    except KeyError:
+        return SelfCheck("Backup root owner", "warning", f"{path} owner uid {path.stat().st_uid} has no passwd entry.")
+    if owner != expected_user:
+        return SelfCheck(
+            "Backup root owner",
+            "warning",
+            f"{path} is owned by {owner}, expected {expected_user}.",
+        )
+    return SelfCheck("Backup root owner", "ok", f"{path} owner={owner}")
+
+
+def _sqlite_database_check(path: Path) -> SelfCheck:
+    if not path.is_absolute():
+        return SelfCheck("SQLite database", "failed", f"{path} is not absolute.")
+    if not path.exists():
+        return SelfCheck("SQLite database", "warning", f"{path} does not exist yet.")
+    if not path.is_file():
+        return SelfCheck("SQLite database", "failed", f"{path} is not a regular file.")
+    if not os.access(path, os.R_OK | os.W_OK):
+        return SelfCheck("SQLite database", "failed", f"{path} is not readable and writable by this process.")
+    return SelfCheck("SQLite database", "ok", str(path))
+
+
+def _path_check(
+    name: str,
+    path: Path,
+    *,
+    must_be_absolute: bool,
+    must_exist: bool = False,
+    must_be_writable: bool,
+) -> SelfCheck:
+    if must_be_absolute and not path.is_absolute():
+        return SelfCheck(name, "failed", f"{path} is not absolute.")
+    if must_exist and not path.exists():
+        return SelfCheck(name, "failed", f"{path} does not exist.")
+
+    target = path if path.exists() else path.parent
+    if not target.exists():
+        return SelfCheck(name, "failed", f"{target} does not exist.")
+    if must_be_writable and not os.access(target, os.W_OK):
+        return SelfCheck(name, "failed", f"{target} is not writable by this process.")
+    return SelfCheck(name, "ok", str(path))
+
+
+def _binary_checks() -> list[SelfCheck]:
+    checks = []
+    for binary in ("rsync", "ssh", "ssh-keygen"):
+        path = shutil.which(binary)
+        checks.append(
+            SelfCheck(
+                f"Binary: {binary}",
+                "ok" if path else "failed",
+                path or f"{binary} was not found in PATH.",
+            )
+        )
+    gunicorn_path = shutil.which("gunicorn") or Path(sys.executable).parent / "gunicorn"
+    checks.append(
+        SelfCheck(
+            "Binary: gunicorn",
+            "ok" if Path(gunicorn_path).exists() else "failed",
+            str(gunicorn_path) if Path(gunicorn_path).exists() else "gunicorn was not found in PATH or next to Python.",
+        )
+    )
+    return checks
+
+
+def _database_checks() -> list[SelfCheck]:
+    try:
+        with connection.cursor() as cursor:
+            cursor.execute("SELECT 1")
+            cursor.fetchone()
+    except Exception as exc:
+        return [SelfCheck("Database connection", "failed", f"{type(exc).__name__}: {exc}")]
+    return [SelfCheck("Database connection", "ok", settings.DATABASES["default"]["ENGINE"])]
+
+
+def _config_checks() -> list[SelfCheck]:
+    try:
+        global_config = GlobalConfig.objects.get(name="default")
+    except GlobalConfig.DoesNotExist:
+        return [SelfCheck("Global config", "warning", "Default global config has not been created yet.")]
+
+    status: CheckStatus = "ok"
+    message = "Default global config exists."
+    if global_config.backup_root != settings.POBSYNC_BACKUP_ROOT:
+        status = "warning"
+        message = "Saved backup root differs from the active backup root."
+    return [
+        SelfCheck(
+            "Global config",
+            status,
+            message,
+            f"saved={global_config.backup_root} active={settings.POBSYNC_BACKUP_ROOT}",
+        )
+    ]
+
+
+def _systemd_checks() -> list[SelfCheck]:
+    if not _native_runtime_available():
+        return [
+            SelfCheck(
+                "Systemd services",
+                "skipped",
+                "systemd is not available in this runtime.",
+                "This is expected inside Docker.",
+            )
+        ]
+
+    checks = []
+    for service in ("pobsync-web.service", "pobsync-worker.service", "pobsync-scheduler.service"):
+        result = subprocess.run(
+            ["systemctl", "is-active", service],
+            check=False,
+            stdout=subprocess.PIPE,
+            stderr=subprocess.PIPE,
+            text=True,
+            timeout=5,
+        )
+        active_state = result.stdout.strip() or result.stderr.strip()
+        checks.append(
+            SelfCheck(
+                service,
+                "ok" if result.returncode == 0 else "failed",
+                active_state,
+            )
+        )
+    if shutil.which("journalctl") is not None:
+        result = subprocess.run(
+            ["journalctl", "--no-pager", "-n", "1", "-u", "pobsync-web.service"],
+            check=False,
+            stdout=subprocess.PIPE,
+            stderr=subprocess.PIPE,
+            text=True,
+            timeout=5,
+        )
+        journal_error = result.stderr.strip()
+        journal_denied = "No journal files were opened" in journal_error or "permission" in journal_error.lower()
+        has_journal_access = result.returncode == 0 and not journal_denied
+        checks.append(
+            SelfCheck(
+                "Journal access",
+                "ok" if has_journal_access else "failed",
+                "pobsync can read service logs." if has_journal_access else "pobsync cannot read service logs.",
+                journal_error,
+            )
+        )
+    return checks

src/pobsync_backend/snapshot_discovery.py

@@ -0,0 +1,203 @@
+from __future__ import annotations
+
+from datetime import datetime, timezone
+from pathlib import Path
+from typing import Any
+
+from pobsync.snapshot_meta import iter_snapshot_dirs, read_snapshot_meta, resolve_host_root
+
+from .models import GlobalConfig, HostConfig, SnapshotRecord
+
+
+def parse_snapshot_datetime(dirname: str, meta: dict[str, Any], key: str) -> datetime | None:
+    value = meta.get(key)
+    if isinstance(value, str):
+        parsed = _parse_iso_z(value)
+        if parsed is not None:
+            return parsed
+
+    if key == "started_at":
+        try:
+            prefix = dirname.split("__", 1)[0]
+            return datetime.strptime(prefix, "%Y%m%d-%H%M%SZ").replace(tzinfo=timezone.utc)
+        except ValueError:
+            return None
+    return None
+
+
+def discover_snapshots(
+    *,
+    host: HostConfig | None = None,
+    global_config: GlobalConfig | None = None,
+    kinds: list[str] | None = None,
+) -> dict[str, Any]:
+    global_config = global_config or GlobalConfig.objects.get(name="default")
+    host_qs = HostConfig.objects.filter(enabled=True).order_by("host")
+    if host is not None:
+        host_qs = host_qs.filter(pk=host.pk)
+
+    kinds = kinds or ["scheduled", "manual", "incomplete"]
+    scanned = 0
+    created = 0
+    updated = 0
+
+    for host_config in host_qs:
+        host_root = resolve_host_root(global_config.backup_root, host_config.host)
+        for kind in kinds:
+            for snapshot_dir in iter_snapshot_dirs(host_root, kind):
+                _record, was_created = upsert_snapshot_record(
+                    host=host_config,
+                    kind=kind,
+                    snapshot_dir=snapshot_dir,
+                )
+                scanned += 1
+                if was_created:
+                    created += 1
+                else:
+                    updated += 1
+        resolve_base_links(host=host_config)
+
+    return {
+        "ok": True,
+        "scanned": scanned,
+        "created": created,
+        "updated": updated,
+    }
+
+
+def inspect_snapshot_discovery(
+    *,
+    host: HostConfig,
+    global_config: GlobalConfig | None = None,
+    kinds: list[str] | None = None,
+) -> dict[str, Any]:
+    try:
+        global_config = global_config or GlobalConfig.objects.get(name="default")
+    except GlobalConfig.DoesNotExist:
+        return {
+            "ok": False,
+            "reason": "missing_global_config",
+            "message": "Create the default global config before discovering snapshots.",
+            "backup_root": "",
+            "host_root": "",
+            "host_root_exists": False,
+            "kind_counts": {},
+            "total_candidates": 0,
+        }
+
+    kinds = kinds or ["scheduled", "manual", "incomplete"]
+    host_root = resolve_host_root(global_config.backup_root, host.host)
+    kind_counts = {kind: len(list(iter_snapshot_dirs(host_root, kind))) for kind in kinds}
+    total_candidates = sum(kind_counts.values())
+    host_root_exists = host_root.exists()
+
+    if not host_root_exists:
+        reason = "missing_host_root"
+        message = f"Host backup directory does not exist yet: {host_root}"
+    elif total_candidates == 0:
+        reason = "no_snapshots"
+        message = f"No snapshot directories found below {host_root}."
+    else:
+        reason = "ready"
+        message = f"Found {total_candidates} snapshot directories below {host_root}."
+
+    return {
+        "ok": True,
+        "reason": reason,
+        "message": message,
+        "backup_root": str(global_config.backup_root),
+        "host_root": str(host_root),
+        "host_root_exists": host_root_exists,
+        "kind_counts": kind_counts,
+        "total_candidates": total_candidates,
+    }
+
+
+def upsert_snapshot_record(*, host: HostConfig, kind: str, snapshot_dir: Path) -> tuple[SnapshotRecord, bool]:
+    meta = read_snapshot_meta(snapshot_dir)
+    base_defaults = _base_defaults_from_meta(meta)
+    defaults = {
+        "path": str(snapshot_dir),
+        **base_defaults,
+        "base": _resolve_base_record(
+            host=host,
+            kind=base_defaults["base_kind"],
+            dirname=base_defaults["base_dirname"],
+        ),
+        "status": str(meta.get("status") or ""),
+        "started_at": parse_snapshot_datetime(snapshot_dir.name, meta, "started_at"),
+        "ended_at": parse_snapshot_datetime(snapshot_dir.name, meta, "ended_at"),
+        "metadata": meta,
+    }
+    return SnapshotRecord.objects.update_or_create(
+        host=host,
+        kind=kind,
+        dirname=snapshot_dir.name,
+        defaults=defaults,
+    )
+
+
+def resolve_base_links(*, host: HostConfig | None = None) -> int:
+    snapshot_qs = SnapshotRecord.objects.exclude(base_dirname="").filter(base__isnull=True)
+    if host is not None:
+        snapshot_qs = snapshot_qs.filter(host=host)
+
+    updated = 0
+    for snapshot in snapshot_qs.select_related("host"):
+        base = _resolve_base_record(
+            host=snapshot.host,
+            kind=snapshot.base_kind,
+            dirname=snapshot.base_dirname,
+        )
+        if base is None:
+            continue
+        snapshot.base = base
+        snapshot.save(update_fields=["base"])
+        updated += 1
+    return updated
+
+
+def infer_snapshot_kind(snapshot_path: Path) -> str:
+    parent = snapshot_path.parent.name
+    if parent == "scheduled":
+        return "scheduled"
+    if parent == "manual":
+        return "manual"
+    if parent == ".incomplete":
+        return "incomplete"
+    raise ValueError(f"Cannot infer snapshot kind from path: {snapshot_path}")
+
+
+def _base_defaults_from_meta(meta: dict[str, Any]) -> dict[str, Any]:
+    base = meta.get("base")
+    if not isinstance(base, dict):
+        base = {}
+
+    return {
+        "base_kind": _base_value(base.get("kind")),
+        "base_dirname": _base_value(base.get("dirname")),
+        "base_path": _base_value(base.get("path")),
+        "base_snapshot_id": _base_value(base.get("id")),
+    }
+
+
+def _base_value(value: Any) -> str:
+    return value if isinstance(value, str) else ""
+
+
+def _resolve_base_record(*, host: HostConfig, kind: str, dirname: str) -> SnapshotRecord | None:
+    if not kind or not dirname:
+        return None
+    return SnapshotRecord.objects.filter(host=host, kind=kind, dirname=dirname).first()
+
+
+def _parse_iso_z(value: str) -> datetime | None:
+    try:
+        if value.endswith("Z"):
+            return datetime.fromisoformat(value.removesuffix("Z") + "+00:00")
+        parsed = datetime.fromisoformat(value)
+        if parsed.tzinfo is None:
+            return parsed.replace(tzinfo=timezone.utc)
+        return parsed
+    except ValueError:
+        return None

src/pobsync_backend/ssh_keys.py

@@ -0,0 +1,145 @@
+from __future__ import annotations
+
+import os
+import shutil
+import subprocess
+from pathlib import Path
+
+from django.conf import settings
+
+from .models import SshCredential
+
+
+class SshKeyError(RuntimeError):
+    pass
+
+
+def credential_dir(credential: SshCredential) -> Path:
+    return Path(settings.POBSYNC_HOME) / "state" / "ssh-credentials" / str(credential.pk)
+
+
+def identity_path(credential: SshCredential) -> Path:
+    if credential.key_path:
+        return Path(credential.key_path)
+    return credential_dir(credential) / "identity"
+
+
+def generate_ssh_key(credential: SshCredential, *, key_type: str = "ed25519", force: bool = False) -> SshCredential:
+    if credential.pk is None:
+        raise SshKeyError("Credential must be saved before generating an SSH key.")
+    if shutil.which("ssh-keygen") is None:
+        raise SshKeyError("ssh-keygen is not available.")
+
+    key_dir = credential_dir(credential)
+    key_dir.mkdir(mode=0o700, parents=True, exist_ok=True)
+    os.chmod(key_dir, 0o700)
+
+    private_key = key_dir / "identity"
+    public_key_file = key_dir / "identity.pub"
+    if force:
+        private_key.unlink(missing_ok=True)
+        public_key_file.unlink(missing_ok=True)
+    elif private_key.exists() or public_key_file.exists():
+        raise SshKeyError(f"SSH key already exists for {credential.name}.")
+
+    result = subprocess.run(
+        [
+            "ssh-keygen",
+            "-t",
+            key_type,
+            "-N",
+            "",
+            "-C",
+            f"pobsync:{credential.name}",
+            "-f",
+            str(private_key),
+        ],
+        check=False,
+        stdin=subprocess.DEVNULL,
+        stdout=subprocess.PIPE,
+        stderr=subprocess.PIPE,
+        text=True,
+        timeout=15,
+    )
+    if result.returncode != 0:
+        raise SshKeyError(result.stderr.strip() or "ssh-keygen failed.")
+
+    os.chmod(private_key, 0o600)
+    public_key = public_key_file.read_text(encoding="utf-8").strip()
+    fingerprint = fingerprint_for_key(private_key)
+
+    credential.private_key = ""
+    credential.public_key = public_key
+    credential.key_path = str(private_key)
+    credential.key_type = key_type
+    credential.fingerprint = fingerprint
+    credential.generated = True
+    credential.save(update_fields=["private_key", "public_key", "key_path", "key_type", "fingerprint", "generated", "updated_at"])
+    return credential
+
+
+def fingerprint_for_key(private_key: Path) -> str:
+    result = subprocess.run(
+        ["ssh-keygen", "-lf", str(private_key)],
+        check=False,
+        stdin=subprocess.DEVNULL,
+        stdout=subprocess.PIPE,
+        stderr=subprocess.PIPE,
+        text=True,
+        timeout=5,
+    )
+    if result.returncode != 0:
+        raise SshKeyError(result.stderr.strip() or "Could not fingerprint SSH key.")
+    return result.stdout.strip()
+
+
+def delete_generated_key_files(credential: SshCredential) -> None:
+    path = identity_path(credential)
+    allowed_root = (Path(settings.POBSYNC_HOME) / "state" / "ssh-credentials").resolve()
+    try:
+        resolved = path.resolve()
+    except FileNotFoundError:
+        resolved = path
+
+    if allowed_root not in resolved.parents:
+        raise SshKeyError(f"Refusing to delete key outside {allowed_root}.")
+
+    path.unlink(missing_ok=True)
+    path.with_suffix(path.suffix + ".pub").unlink(missing_ok=True)
+    if path.name == "identity":
+        (path.parent / "identity.pub").unlink(missing_ok=True)
+
+
+def scan_known_host(address: str, *, port: int = 22, timeout: int = 5) -> str:
+    if shutil.which("ssh-keyscan") is None:
+        raise SshKeyError("ssh-keyscan is not available.")
+
+    command = ["ssh-keyscan", "-T", str(timeout), "-p", str(port), address]
+    result = subprocess.run(
+        command,
+        check=False,
+        stdin=subprocess.DEVNULL,
+        stdout=subprocess.PIPE,
+        stderr=subprocess.PIPE,
+        text=True,
+        timeout=timeout + 2,
+    )
+    if result.returncode != 0 and not result.stdout.strip():
+        raise SshKeyError(result.stderr.strip() or f"Could not scan SSH host key for {address}.")
+
+    lines = [line.strip() for line in result.stdout.splitlines() if line.strip() and not line.startswith("#")]
+    if not lines:
+        raise SshKeyError(f"ssh-keyscan returned no host keys for {address}.")
+    return "\n".join(lines)
+
+
+def merge_known_hosts(existing: str, scanned: str) -> str:
+    lines: list[str] = []
+    seen: set[str] = set()
+    for line in [*existing.splitlines(), *scanned.splitlines()]:
+        normalized = line.strip()
+        if not normalized or normalized in seen:
+            continue
+        seen.add(normalized)
+        lines.append(normalized)
+    return "\n".join(lines) + ("\n" if lines else "")

src/pobsync_backend/stats_summary.py

@@ -0,0 +1,218 @@
+from __future__ import annotations
+
+from pathlib import Path
+from typing import Any, Iterable
+
+from django.utils import timezone
+
+from pobsync.run_stats import filesystem_capacity
+
+from .models import BackupRun, GlobalConfig, HostConfig, SnapshotRecord
+
+
+def collect_dashboard_stats(*, hosts: Iterable[HostConfig], global_config: GlobalConfig | None) -> dict[str, Any]:
+    runs = list(
+        BackupRun.objects.select_related("host", "snapshot")
+        .filter(status__in=_COMPLETED_BACKUP_STATUSES)
+        .order_by("-started_at", "-created_at")[:100]
+    )
+    real_runs = [_run_summary(run) for run in runs if _is_real_run(run)]
+    real_runs = [run for run in real_runs if run["has_stats"]]
+
+    for host in hosts:
+        host.stats_summary = collect_host_stats(host=host)
+
+    literal_values = [_int_at(run, "rsync", "literal_data_bytes") for run in real_runs]
+    literal_values = [value for value in literal_values if value is not None]
+    matched_values = [_int_at(run, "rsync", "matched_data_bytes") for run in real_runs]
+    matched_values = [value for value in matched_values if value is not None]
+    duration_values = [_int_at(run, "duration_seconds") for run in real_runs]
+    duration_values = [value for value in duration_values if value is not None]
+
+    avg_literal = _average(literal_values)
+    total_literal = sum(literal_values)
+    total_matched = sum(matched_values)
+    savings_basis = total_literal + total_matched
+    capacity = _capacity_from_system(global_config) or _latest_capacity_from_runs(real_runs) or {}
+    available = _int_at(capacity, "available_bytes")
+    daily_literal = _average_daily_literal(real_runs)
+
+    link_dest_savings_ratio = round(total_matched / savings_basis, 4) if savings_basis else None
+
+    return {
+        "runs_sampled": len(real_runs),
+        "avg_duration_seconds": _average(duration_values),
+        "avg_daily_literal_data_bytes": daily_literal,
+        "avg_literal_data_bytes": avg_literal,
+        "total_literal_data_bytes": total_literal,
+        "total_matched_data_bytes": total_matched,
+        "link_dest_savings_ratio": link_dest_savings_ratio,
+        "link_dest_savings_percent": round(link_dest_savings_ratio * 100, 1) if link_dest_savings_ratio is not None else None,
+        "estimated_runs_until_full": int(available / avg_literal) if available and avg_literal else None,
+        "estimated_days_until_full": int(available / daily_literal) if available and daily_literal else None,
+        "capacity": capacity,
+    }
+
+
+def collect_host_stats(*, host: HostConfig, limit: int = 8) -> dict[str, Any]:
+    runs = list(host.runs.select_related("snapshot").order_by("-started_at", "-created_at")[:50])
+    real_runs = [_run_summary(run) for run in runs if _is_real_run(run)]
+    completed_real_runs = [run for run in real_runs if run["status"] in _COMPLETED_BACKUP_STATUSES]
+    trend_runs = [run for run in completed_real_runs if run["has_stats"]][:limit]
+    latest_snapshot = host.snapshots.order_by("-started_at", "-discovered_at", "-id").first()
+    latest_snapshot_stats = _snapshot_summary(latest_snapshot) if latest_snapshot else {}
+
+    literal_values = [_int_at(run, "rsync", "literal_data_bytes") for run in trend_runs]
+    literal_values = [value for value in literal_values if value is not None]
+    matched_values = [_int_at(run, "rsync", "matched_data_bytes") for run in trend_runs]
+    matched_values = [value for value in matched_values if value is not None]
+    max_literal = max(literal_values) if literal_values else 0
+    max_matched = max(matched_values) if matched_values else 0
+
+    return {
+        "runs": [_with_bar_percentages(run, max_literal=max_literal, max_matched=max_matched) for run in trend_runs],
+        "latest_run": completed_real_runs[0] if completed_real_runs else {},
+        "latest_good_run": _first_run_with_status(real_runs, {BackupRun.Status.SUCCESS}),
+        "latest_problem_run": _first_run_with_status(real_runs, {BackupRun.Status.WARNING, BackupRun.Status.FAILED}),
+        "latest_snapshot": latest_snapshot_stats,
+        "avg_literal_data_bytes": _average(literal_values),
+        "avg_daily_literal_data_bytes": _average_daily_literal(trend_runs),
+        "total_literal_data_bytes": sum(literal_values),
+        "total_matched_data_bytes": sum(matched_values),
+    }
+
+
+def _run_summary(run: BackupRun) -> dict[str, Any]:
+    result = run.result if isinstance(run.result, dict) else {}
+    stats = result.get("stats") if isinstance(result.get("stats"), dict) else {}
+    return {
+        "id": run.id,
+        "host": run.host.host,
+        "run_type": run.run_type,
+        "started_at": run.started_at,
+        "ended_at": run.ended_at,
+        "snapshot": run.snapshot,
+        "snapshot_path": run.snapshot_path,
+        "status": run.status,
+        "reviewed_at": run.reviewed_at,
+        "has_stats": bool(stats),
+        "duration_seconds": _int_at(stats, "duration_seconds"),
+        "rsync": stats.get("rsync") if isinstance(stats.get("rsync"), dict) else {},
+        "storage": stats.get("storage") if isinstance(stats.get("storage"), dict) else {},
+    }
+
+
+def _snapshot_summary(snapshot: SnapshotRecord | None) -> dict[str, Any]:
+    if snapshot is None:
+        return {}
+    metadata = snapshot.metadata if isinstance(snapshot.metadata, dict) else {}
+    stats = metadata.get("stats") if isinstance(metadata.get("stats"), dict) else {}
+    storage = stats.get("storage") if isinstance(stats.get("storage"), dict) else {}
+    snapshot_storage = storage.get("snapshot") if isinstance(storage.get("snapshot"), dict) else {}
+    return {
+        "id": snapshot.id,
+        "dirname": snapshot.dirname,
+        "kind": snapshot.kind,
+        "status": snapshot.status,
+        "started_at": snapshot.started_at,
+        "apparent_size_bytes": _int_at(snapshot_storage, "apparent_size_bytes"),
+        "allocated_size_bytes": _int_at(snapshot_storage, "allocated_size_bytes"),
+        "hardlinked_files": _int_at(snapshot_storage, "hardlinked_files"),
+    }
+
+
+def _is_real_run(run: BackupRun) -> bool:
+    result = run.result if isinstance(run.result, dict) else {}
+    if result.get("dry_run") is True:
+        return False
+    requested = result.get("requested") if isinstance(result.get("requested"), dict) else {}
+    return requested.get("dry_run") is not True
+
+
+def _first_run_with_status(runs: list[dict[str, Any]], statuses: set[str]) -> dict[str, Any]:
+    for run in runs:
+        if run["status"] in statuses and run.get("reviewed_at") is None:
+            return run
+    return {}
+
+
+def _capacity_from_system(global_config: GlobalConfig | None) -> dict[str, Any]:
+    if global_config is None or not global_config.backup_root:
+        return {}
+    return filesystem_capacity(Path(global_config.backup_root))
+
+
+def _latest_capacity_from_runs(runs: list[dict[str, Any]]) -> dict[str, Any]:
+    for run in runs:
+        capacity = _dict_at(run, "storage", "capacity")
+        if capacity:
+            return capacity
+    return {}
+
+
+def _average(values: list[int]) -> int | None:
+    if not values:
+        return None
+    return int(sum(values) / len(values))
+
+
+def _average_daily_literal(runs: list[dict[str, Any]]) -> int | None:
+    values = [_int_at(run, "rsync", "literal_data_bytes") for run in runs]
+    values = [value for value in values if value is not None]
+    if not values:
+        return None
+
+    timestamps = [run["started_at"] for run in runs if run.get("started_at") is not None]
+    if len(timestamps) < 2:
+        return _average(values)
+
+    oldest = min(timestamps)
+    newest = max(timestamps)
+    if timezone.is_naive(oldest):
+        oldest = timezone.make_aware(oldest)
+    if timezone.is_naive(newest):
+        newest = timezone.make_aware(newest)
+    span_days = max((newest - oldest).total_seconds() / 86400, 1)
+    return int(sum(values) / span_days)
+
+
+def _with_bar_percentages(run: dict[str, Any], *, max_literal: int, max_matched: int) -> dict[str, Any]:
+    run = dict(run)
+    literal = _int_at(run, "rsync", "literal_data_bytes") or 0
+    matched = _int_at(run, "rsync", "matched_data_bytes") or 0
+    run["literal_percent"] = _percentage(literal, max_literal)
+    run["matched_percent"] = _percentage(matched, max_matched)
+    return run
+
+
+def _percentage(value: int, maximum: int) -> int:
+    if maximum <= 0 or value <= 0:
+        return 0
+    return max(1, min(100, int(value / maximum * 100)))
+
+
+def _dict_at(data: dict[str, Any], *keys: str) -> dict[str, Any]:
+    value: Any = data
+    for key in keys:
+        if not isinstance(value, dict):
+            return {}
+        value = value.get(key)
+    return value if isinstance(value, dict) else {}
+
+
+def _int_at(data: dict[str, Any], *keys: str) -> int | None:
+    value: Any = data
+    for key in keys:
+        if not isinstance(value, dict):
+            return None
+        value = value.get(key)
+    if isinstance(value, bool):
+        return None
+    if isinstance(value, int):
+        return value
+    if isinstance(value, float):
+        return int(value)
+    return None
+
+
+_COMPLETED_BACKUP_STATUSES = [BackupRun.Status.SUCCESS, BackupRun.Status.WARNING]

src/pobsync_backend/templates/pobsync_backend/base.html

@@ -0,0 +1,396 @@
+<!doctype html>
+<html lang="en">
+<head>
+  <meta charset="utf-8">
+  <meta name="viewport" content="width=device-width, initial-scale=1">
+  <title>{% block title %}pobsync{% endblock %}</title>
+  <style>
+    :root {
+      color-scheme: light;
+      --bg: #f5f7fa;
+      --panel: #ffffff;
+      --border: #d9e0e8;
+      --text: #17202a;
+      --muted: #657386;
+      --link: #0b5cad;
+      --success: #176b3a;
+      --failed: #a12828;
+      --running: #8a5a00;
+    }
+    * { box-sizing: border-box; }
+    body {
+      margin: 0;
+      background: var(--bg);
+      color: var(--text);
+      font: 14px/1.45 system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
+    }
+    a { color: var(--link); text-decoration: none; }
+    a:hover { text-decoration: underline; }
+    header {
+      background: var(--panel);
+      border-bottom: 1px solid var(--border);
+      padding: 14px 24px;
+    }
+    nav {
+      display: flex;
+      align-items: center;
+      gap: 18px;
+      max-width: 1180px;
+      margin: 0 auto;
+    }
+    nav strong { font-size: 16px; }
+    nav .spacer { flex: 1; }
+    main {
+      max-width: 1180px;
+      margin: 0 auto;
+      padding: 24px;
+    }
+    h1 { font-size: 26px; margin: 0 0 18px; }
+    h2 { font-size: 18px; margin: 0 0 12px; }
+    .grid {
+      display: grid;
+      grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
+      gap: 12px;
+      margin-bottom: 22px;
+    }
+    .metric, .panel {
+      background: var(--panel);
+      border: 1px solid var(--border);
+      border-radius: 8px;
+    }
+    .metric { padding: 14px; }
+    .metric .label { color: var(--muted); font-size: 12px; text-transform: uppercase; }
+    .metric .value { font-size: 26px; font-weight: 650; margin-top: 4px; }
+    .metric.failed { border-color: #e8b4b4; background: #fff7f7; }
+    .metric.warning { border-color: #e7cf8a; background: #fffaf0; }
+    .metric.running { border-color: #e7cf8a; background: #fffaf0; }
+    .metric.queued { border-color: #b5cdea; background: #eef6ff; }
+    .panel { padding: 16px; margin-bottom: 18px; overflow: auto; }
+    .panel.highlight { border-left: 4px solid var(--border); }
+    .panel.highlight.failed { border-left-color: var(--failed); background: #fff7f7; }
+    .panel.highlight.warning { border-left-color: var(--running); background: #fffaf0; }
+    .panel.highlight.success { border-left-color: var(--success); background: #f5fbf7; }
+    table { width: 100%; border-collapse: collapse; min-width: 640px; }
+    th, td { border-bottom: 1px solid var(--border); padding: 9px 8px; text-align: left; vertical-align: top; }
+    th { color: var(--muted); font-size: 12px; font-weight: 650; text-transform: uppercase; }
+    tr:last-child td { border-bottom: 0; }
+    .muted { color: var(--muted); }
+    .status {
+      display: inline-block;
+      border: 1px solid var(--border);
+      border-radius: 999px;
+      padding: 2px 8px;
+      white-space: nowrap;
+    }
+    .status.success { color: var(--success); border-color: #a7d8b9; background: #edf8f1; }
+    .status.ok { color: var(--success); border-color: #a7d8b9; background: #edf8f1; }
+    .status.failed { color: var(--failed); border-color: #e8b4b4; background: #fff0f0; }
+    .status.blocked { color: var(--failed); border-color: #e8b4b4; background: #fff0f0; }
+    .status.running { color: var(--running); border-color: #e7cf8a; background: #fff8df; }
+    .status.warning { color: var(--running); border-color: #e7cf8a; background: #fff8df; }
+    .status.queued { color: var(--link); border-color: #b5cdea; background: #eef6ff; }
+    .status.skipped { color: var(--muted); background: #f7f9fb; }
+    .stack { display: grid; gap: 4px; }
+    .stack.spaced { margin-bottom: 14px; }
+    .two-col { display: grid; gap: 18px; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); }
+    .actions { display: flex; flex-wrap: wrap; gap: 10px; margin: 0 0 18px; }
+    .actions.inline { margin: 12px 0 0; }
+    button, .button-link {
+      appearance: none;
+      background: #17202a;
+      border: 1px solid #17202a;
+      border-radius: 6px;
+      color: #fff;
+      cursor: pointer;
+      font: inherit;
+      font-weight: 650;
+      padding: 8px 12px;
+    }
+    button:hover, .button-link:hover { background: #2a394a; text-decoration: none; }
+    button.secondary,
+    .button-link.secondary {
+      background: #fff;
+      border-color: var(--border);
+      color: var(--text);
+    }
+    button.secondary:hover,
+    .button-link.secondary:hover { background: #eef3f8; }
+    button:disabled {
+      background: #d8dee6;
+      border-color: #d8dee6;
+      color: var(--muted);
+      cursor: not-allowed;
+    }
+    .inline-form { margin: 0; }
+    .status-overview {
+      display: grid;
+      gap: 8px;
+    }
+    .status-summary {
+      align-items: center;
+      border: 1px solid var(--border);
+      border-radius: 6px;
+      display: flex;
+      flex-wrap: wrap;
+      gap: 8px;
+      padding: 10px;
+    }
+    .status-summary.failed { border-color: #e8b4b4; background: #fff7f7; color: var(--failed); }
+    .status-summary.warning,
+    .status-summary.running { border-color: #e7cf8a; background: #fffaf0; color: var(--running); }
+    .status-summary.queued { border-color: #b5cdea; background: #eef6ff; color: var(--link); }
+    .operator-state {
+      align-items: center;
+      display: flex;
+      flex-wrap: wrap;
+      gap: 8px;
+      margin-bottom: 14px;
+    }
+    .trend-bars {
+      display: grid;
+      gap: 5px;
+      min-width: 150px;
+    }
+    .trend-bar {
+      background: #edf2f7;
+      border-radius: 4px;
+      height: 8px;
+      overflow: hidden;
+    }
+    .trend-bar span {
+      background: var(--link);
+      display: block;
+      height: 100%;
+      min-width: 0;
+    }
+    .trend-bar.matched span { background: var(--success); }
+    .trend-legend {
+      color: var(--muted);
+      display: flex;
+      font-size: 12px;
+      gap: 10px;
+    }
+    .insight-grid {
+      display: grid;
+      gap: 18px 24px;
+      grid-template-columns: minmax(260px, 1.3fr) repeat(auto-fit, minmax(180px, 1fr));
+    }
+    .insight-main,
+    .insight-item {
+      display: grid;
+      gap: 4px;
+      min-width: 0;
+    }
+    .insight-main .label,
+    .insight-item .label {
+      color: var(--muted);
+      font-size: 12px;
+      font-weight: 650;
+      text-transform: uppercase;
+    }
+    .insight-main .value,
+    .insight-item .value {
+      font-size: 22px;
+      font-weight: 650;
+      overflow-wrap: anywhere;
+    }
+    .storage-meter {
+      background: #edf2f7;
+      border-radius: 999px;
+      height: 10px;
+      margin: 4px 0;
+      overflow: hidden;
+    }
+    .storage-meter span {
+      background: var(--link);
+      display: block;
+      height: 100%;
+      max-width: 100%;
+    }
+    .host-list {
+      display: grid;
+      gap: 12px;
+    }
+    .host-card {
+      border: 1px solid var(--border);
+      border-radius: 8px;
+      padding: 16px;
+    }
+    .host-card-header {
+      align-items: start;
+      display: flex;
+      gap: 12px;
+      justify-content: space-between;
+      margin-bottom: 14px;
+    }
+    .host-card-title {
+      display: grid;
+      gap: 3px;
+      min-width: 0;
+    }
+    .host-card-title a {
+      font-size: 17px;
+      font-weight: 650;
+      overflow-wrap: anywhere;
+    }
+    .host-card-status {
+      display: flex;
+      flex: 0 1 auto;
+      flex-wrap: wrap;
+      gap: 6px;
+      justify-content: flex-end;
+      max-width: 50%;
+    }
+    .host-card-layout {
+      display: grid;
+      gap: 24px;
+      grid-template-columns: minmax(0, 2fr) minmax(260px, 1fr);
+    }
+    .host-card-section {
+      align-content: start;
+      display: grid;
+      gap: 10px;
+      min-width: 0;
+    }
+    .host-card-section-title {
+      color: var(--muted);
+      font-size: 12px;
+      font-weight: 650;
+      text-transform: uppercase;
+    }
+    .host-card-timeline {
+      display: grid;
+      gap: 16px 22px;
+      grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
+    }
+    .host-card-stats {
+      align-content: start;
+      display: grid;
+      border-top: 1px solid #e6edf4;
+      gap: 12px 18px;
+      grid-template-columns: repeat(2, minmax(0, 1fr));
+      padding-top: 12px;
+    }
+    .host-card-item {
+      display: grid;
+      gap: 3px;
+      min-width: 0;
+    }
+    .host-card-item .label {
+      color: var(--muted);
+      font-size: 12px;
+      font-weight: 650;
+      text-transform: uppercase;
+    }
+    .host-card-item .value {
+      overflow-wrap: anywhere;
+    }
+    .host-card-stat {
+      display: grid;
+      gap: 3px;
+      min-width: 0;
+    }
+    .host-card-stat .label {
+      color: var(--muted);
+      font-size: 11px;
+      font-weight: 650;
+      text-transform: uppercase;
+    }
+    .host-card-stat .value {
+      font-size: 16px;
+      font-weight: 650;
+      overflow-wrap: anywhere;
+    }
+    .host-card-stat.wide {
+      grid-column: 1 / -1;
+    }
+    .host-card-warning {
+      background: #fffaf0;
+      border: 1px solid #e7cf8a;
+      border-radius: 6px;
+      color: var(--running);
+      display: flex;
+      flex-wrap: wrap;
+      gap: 8px;
+      margin-top: 14px;
+      padding: 10px;
+    }
+    .messages { display: grid; gap: 8px; margin-bottom: 18px; }
+    .message {
+      background: var(--panel);
+      border: 1px solid var(--border);
+      border-radius: 8px;
+      padding: 10px 12px;
+    }
+    .message.success { border-color: #a7d8b9; background: #edf8f1; color: var(--success); }
+    .message.error { border-color: #e8b4b4; background: #fff0f0; color: var(--failed); }
+    .message.warning { border-color: #e7cf8a; background: #fff8df; color: var(--running); }
+    .form-grid { display: grid; gap: 14px; max-width: 680px; }
+    .field { display: grid; gap: 5px; }
+    .field label { font-weight: 650; }
+    .field input[type="text"], .field input[type="number"], .field select, .field textarea {
+      border: 1px solid var(--border);
+      border-radius: 6px;
+      font: inherit;
+      padding: 8px 10px;
+      width: 100%;
+    }
+    .field textarea { min-height: 92px; resize: vertical; }
+    .field .helptext { color: var(--muted); font-size: 12px; }
+    .field input[type="checkbox"] { justify-self: start; }
+    pre {
+      background: #101820;
+      border-radius: 6px;
+      color: #edf4fb;
+      line-height: 1.5;
+      margin: 0;
+      overflow: auto;
+      padding: 12px;
+      white-space: pre-wrap;
+      word-break: break-word;
+    }
+    .errorlist {
+      color: var(--failed);
+      list-style: none;
+      margin: 0;
+      padding: 0;
+    }
+    @media (max-width: 800px) {
+      main { padding: 16px; }
+      nav { padding: 0; }
+      .two-col { grid-template-columns: 1fr; }
+      .host-card-header { display: grid; }
+      .host-card-status { justify-content: flex-start; max-width: none; }
+      .host-card-layout { grid-template-columns: 1fr; }
+      .host-card-stats { grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)); }
+      .insight-grid { grid-template-columns: 1fr; }
+    }
+  </style>
+</head>
+<body>
+  <header>
+    <nav>
+      <strong><a href="{% url 'dashboard' %}">pobsync</a></strong>
+      <a href="{% url 'admin:index' %}">Admin</a>
+      <a href="{% url 'ssh_credentials' %}">SSH Keys</a>
+      <a href="{% url 'self_check' %}">Self Check</a>
+      <a href="{% url 'logs' %}">Logs</a>
+      <a href="{% url 'purged_snapshots' %}">Purged</a>
+      <a href="{% url 'changelog' %}">Changelog</a>
+      <a href="/api/status/">Status API</a>
+      <span class="spacer"></span>
+      <span class="muted">{{ request.user.username }}</span>
+    </nav>
+  </header>
+  <main>
+    {% if messages %}
+      <section class="messages" aria-label="Messages">
+        {% for message in messages %}
+          <div class="message {{ message.tags }}">{{ message }}</div>
+        {% endfor %}
+      </section>
+    {% endif %}
+    {% block content %}{% endblock %}
+  </main>
+</body>
+</html>

src/pobsync_backend/templates/pobsync_backend/changelog.html

@@ -0,0 +1,41 @@
+{% extends "pobsync_backend/base.html" %}
+
+{% block title %}Changelog - pobsync{% endblock %}
+
+{% block content %}
+  <h1>Changelog</h1>
+
+  <section class="actions" aria-label="Changelog actions">
+    <a class="button-link secondary" href="{% url 'dashboard' %}">Back to dashboard</a>
+  </section>
+
+  <section class="panel">
+    <div class="stack spaced">
+      <div><strong>Installed version:</strong> {{ app_version }}</div>
+      <div class="muted">Changelog file: {{ changelog_path }}</div>
+      {% if missing %}
+        <div class="status warning">missing</div>
+      {% endif %}
+    </div>
+
+    <div class="stack">
+      {% for block in changelog_blocks %}
+        {% if block.kind == "heading" %}
+          {% if block.level == 1 %}
+            <h2>{{ block.text }}</h2>
+          {% else %}
+            <h3>{{ block.text }}</h3>
+          {% endif %}
+        {% elif block.kind == "list" %}
+          <ul>
+            {% for item in block.items %}
+              <li>{{ item }}</li>
+            {% endfor %}
+          </ul>
+        {% else %}
+          <p>{{ block.text }}</p>
+        {% endif %}
+      {% endfor %}
+    </div>
+  </section>
+{% endblock %}

src/pobsync_backend/templates/pobsync_backend/dashboard.html

@@ -0,0 +1,290 @@
+{% extends "pobsync_backend/base.html" %}
+
+{% block title %}pobsync dashboard{% endblock %}
+
+{% block content %}
+  <h1>Dashboard</h1>
+
+  <section class="actions" aria-label="Dashboard actions">
+    <a class="button-link" href="{% url 'create_host_config' %}">New host</a>
+    <a class="button-link secondary" href="{% url 'edit_global_config' %}">{% if global_config %}Edit global config{% else %}Create global config{% endif %}</a>
+  </section>
+
+  {% if not global_config or not counts.hosts %}
+    <section class="panel">
+      <h2>Setup</h2>
+      {% if not global_config %}
+        <p class="muted">No default global config exists yet. Create it first so discovery, backups, and retention know where pobsync stores snapshots.</p>
+        <div class="actions inline">
+          <a class="button-link" href="{% url 'edit_global_config' %}">Create global config</a>
+        </div>
+      {% elif not counts.hosts %}
+        <p class="muted">Global config is ready. Add the first host to make this dashboard useful.</p>
+        <div class="actions inline">
+          <a class="button-link" href="{% url 'create_host_config' %}">Add first host</a>
+        </div>
+      {% endif %}
+    </section>
+  {% endif %}
+
+  <section class="grid" aria-label="Summary">
+    <div class="metric"><div class="label">Hosts</div><div class="value">{{ counts.enabled_hosts }}/{{ counts.hosts }}</div></div>
+    <div class="metric"><div class="label">Schedules</div><div class="value">{{ counts.enabled_schedules }}/{{ counts.schedules }}</div></div>
+    <div class="metric"><div class="label">Snapshots</div><div class="value">{{ counts.snapshots }}</div></div>
+    <div class="metric"><div class="label">Runs</div><div class="value">{{ counts.runs }}</div></div>
+    <div class="metric {% if counts.queued_runs %}queued{% endif %}"><div class="label">Queued</div><div class="value">{{ counts.queued_runs }}</div></div>
+    <div class="metric {% if counts.running_runs %}running{% endif %}"><div class="label">Running</div><div class="value">{{ counts.running_runs }}</div></div>
+    <div class="metric {% if counts.warning_runs %}warning{% endif %}"><div class="label">Warnings</div><div class="value">{{ counts.warning_runs }}</div></div>
+    <div class="metric {% if counts.failed_runs %}failed{% endif %}"><div class="label">Failed</div><div class="value">{{ counts.failed_runs }}</div></div>
+  </section>
+
+  <section class="panel">
+    <h2>Operational Status</h2>
+    {% if counts.failed_runs or counts.warning_runs or counts.running_runs or counts.queued_runs %}
+      <div class="status-overview">
+        {% if counts.failed_runs %}
+          <div class="status-summary failed">
+            <span class="status failed">failed</span>
+            <strong>{{ counts.failed_runs }} failed run{{ counts.failed_runs|pluralize }} need{{ counts.failed_runs|pluralize:"s," }} review.</strong>
+          </div>
+        {% endif %}
+        {% if counts.warning_runs %}
+          <div class="status-summary warning">
+            <span class="status warning">warning</span>
+            <strong>{{ counts.warning_runs }} run{{ counts.warning_runs|pluralize }} completed with warnings.</strong>
+          </div>
+        {% endif %}
+        {% if counts.running_runs %}
+          <div class="status-summary running">
+            <span class="status running">running</span>
+            <strong>{{ counts.running_runs }} backup run{{ counts.running_runs|pluralize }} in progress.</strong>
+          </div>
+        {% endif %}
+        {% if counts.queued_runs %}
+          <div class="status-summary queued">
+            <span class="status queued">queued</span>
+            <strong>{{ counts.queued_runs }} backup run{{ counts.queued_runs|pluralize }} waiting for the worker.</strong>
+          </div>
+        {% endif %}
+      </div>
+    {% elif counts.hosts %}
+      <p><span class="status ok">ok</span> No queued, running, or unreviewed warning/failed runs.</p>
+    {% else %}
+      <p class="muted">Add a host to start tracking backup status here.</p>
+    {% endif %}
+  </section>
+
+  <section class="panel">
+    <h2>Backup Trends</h2>
+    {% if stats_summary.runs_sampled %}
+      <div class="insight-grid" aria-label="Backup trends">
+        <div class="insight-main">
+          <div class="label">Storage Used</div>
+          <div class="value">
+            {% if stats_summary.capacity.used_percent is not None %}
+              {{ stats_summary.capacity.used_percent|floatformat:1 }}%
+            {% else %}
+              unknown
+            {% endif %}
+          </div>
+          {% if stats_summary.capacity.used_percent is not None %}
+            <div class="storage-meter" aria-label="Backup root storage usage">
+              <span style="width: {{ stats_summary.capacity.used_percent|floatformat:0 }}%"></span>
+            </div>
+          {% endif %}
+          <div class="muted">
+            {{ stats_summary.capacity.available_bytes|filesizeformat }} available from the backup root.
+          </div>
+        </div>
+        <div class="insight-item">
+          <div class="label">Runway</div>
+          <div class="value">
+            {% if stats_summary.estimated_days_until_full %}
+              {{ stats_summary.estimated_days_until_full }} days
+            {% elif stats_summary.estimated_runs_until_full %}
+              {{ stats_summary.estimated_runs_until_full }} runs
+            {% else %}
+              unknown
+            {% endif %}
+          </div>
+          <div class="muted">Estimated from average new data per day.</div>
+        </div>
+        <div class="insight-item">
+          <div class="label">New Data</div>
+          <div class="value">{{ stats_summary.avg_daily_literal_data_bytes|filesizeformat }}/day</div>
+          <div class="muted">{{ stats_summary.avg_literal_data_bytes|filesizeformat }} per backup on average.</div>
+        </div>
+        <div class="insight-item">
+          <div class="label">Link-Dest Savings</div>
+          <div class="value">
+            {% if stats_summary.link_dest_savings_percent is not None %}
+              {{ stats_summary.link_dest_savings_percent|floatformat:1 }}%
+            {% else %}
+              unknown
+            {% endif %}
+          </div>
+          <div class="muted">{{ stats_summary.total_matched_data_bytes|filesizeformat }} reused across sampled runs.</div>
+        </div>
+        <div class="insight-item">
+          <div class="label">Average Duration</div>
+          <div class="value">{{ stats_summary.avg_duration_seconds|default:"unknown" }}{% if stats_summary.avg_duration_seconds is not None %}s{% endif %}</div>
+          <div class="muted">Based on {{ stats_summary.runs_sampled }} completed backup run{{ stats_summary.runs_sampled|pluralize }} with stats.</div>
+        </div>
+      </div>
+    {% else %}
+      <p class="muted">No completed backup runs with stats yet. This section will show disk usage, growth estimates, and link-dest savings after the first real backup finishes.</p>
+    {% endif %}
+  </section>
+
+  <section class="panel">
+    <h2>Hosts</h2>
+    <div class="host-list">
+      {% for host in hosts %}
+        <article class="host-card">
+          <div class="host-card-header">
+            <div class="host-card-title">
+              <a href="{% url 'host_detail' host.host %}">{{ host.host }}</a>
+              <span class="muted">{{ host.address }}</span>
+            </div>
+            <div class="host-card-status">
+              <span class="status {% if host.enabled %}ok{% else %}skipped{% endif %}">{{ host.enabled|yesno:"enabled,disabled" }}</span>
+              {% if host.queued_run_count %}
+                <span class="status queued">queued {{ host.queued_run_count }}</span>
+              {% endif %}
+              {% if host.running_run_count %}
+                <span class="status running">running {{ host.running_run_count }}</span>
+              {% endif %}
+              {% if host.warning_run_count %}
+                <span class="status warning">warning {{ host.warning_run_count }}</span>
+              {% endif %}
+              {% if host.failed_run_count %}
+                <span class="status failed">failed {{ host.failed_run_count }}</span>
+              {% endif %}
+            </div>
+          </div>
+          <div class="host-card-layout">
+            <div class="host-card-section">
+              <div class="host-card-section-title">Backup activity</div>
+              <div class="host-card-timeline">
+                <div class="host-card-item">
+                  <div class="label">Latest Snapshot</div>
+                  <div class="value">
+                  {% if host.latest_snapshot %}
+                    <a href="{% url 'snapshot_detail' host.latest_snapshot.id %}">{{ host.latest_snapshot.dirname }}</a>
+                    <div class="muted">{{ host.latest_snapshot.kind }} {{ host.latest_snapshot.status }}</div>
+                  {% else %}
+                    <span class="muted">none</span>
+                  {% endif %}
+                  </div>
+                </div>
+                <div class="host-card-item">
+                  <div class="label">Last Good Backup</div>
+                  <div class="value">
+                  {% if host.stats_summary.latest_good_run.id %}
+                    <a href="{% url 'run_detail' host.stats_summary.latest_good_run.id %}">Run {{ host.stats_summary.latest_good_run.id }}</a>
+                    <div class="muted">{{ host.stats_summary.latest_good_run.run_type }} {{ host.stats_summary.latest_good_run.duration_seconds|default:"" }}{% if host.stats_summary.latest_good_run.duration_seconds is not None %}s{% endif %}</div>
+                  {% else %}
+                    <span class="muted">none</span>
+                  {% endif %}
+                  </div>
+                </div>
+                <div class="host-card-item">
+                  <div class="label">Latest Issue</div>
+                  <div class="value">
+                  {% if host.stats_summary.latest_problem_run.id %}
+                    <a href="{% url 'run_detail' host.stats_summary.latest_problem_run.id %}">Run {{ host.stats_summary.latest_problem_run.id }}</a>
+                    <div><span class="status {{ host.stats_summary.latest_problem_run.status }}">{{ host.stats_summary.latest_problem_run.status }}</span></div>
+                    <div class="muted">{{ host.stats_summary.latest_problem_run.run_type }} {{ host.stats_summary.latest_problem_run.duration_seconds|default:"" }}{% if host.stats_summary.latest_problem_run.duration_seconds is not None %}s{% endif %}</div>
+                  {% else %}
+                    <span class="muted">none</span>
+                  {% endif %}
+                  </div>
+                </div>
+                <div class="host-card-item">
+                  <div class="label">Next Run</div>
+                  <div class="value">
+                  {% if host.next_run_at %}
+                    {{ host.next_run_at|date:"Y-m-d H:i T" }}
+                    <div class="muted">{{ scheduler_timezone }}</div>
+                  {% else %}
+                    <span class="muted">none</span>
+                  {% endif %}
+                  </div>
+                </div>
+              </div>
+            </div>
+            <div class="host-card-section">
+              <div class="host-card-section-title">Snapshot health</div>
+              <div class="host-card-stats">
+                <div class="host-card-stat">
+                  <div class="label">Snapshots</div>
+                  <div class="value">{{ host.snapshot_count }}</div>
+                </div>
+                <div class="host-card-stat">
+                  <div class="label">Runs</div>
+                  <div class="value">{{ host.run_count }}</div>
+                </div>
+                <div class="host-card-stat">
+                  <div class="label">New Data</div>
+                  <div class="value">{{ host.stats_summary.latest_run.rsync.literal_data_bytes|filesizeformat }}</div>
+                </div>
+                <div class="host-card-stat">
+                  <div class="label">Retention</div>
+                  <div class="value">d{{ host.retention_daily }} w{{ host.retention_weekly }} m{{ host.retention_monthly }} y{{ host.retention_yearly }}</div>
+                </div>
+              </div>
+            </div>
+          </div>
+          {% if host.retention_warning.has_warning %}
+            <div class="host-card-warning">
+              <span class="status warning">retention</span>
+              {% if host.retention_warning.prune_exceeded %}
+                Scheduled prune would delete {{ host.retention_warning.delete_count }} snapshot(s), above max {{ host.retention_warning.max_delete }}.
+              {% endif %}
+              {% if host.retention_warning.incomplete_count %}
+                {{ host.retention_warning.incomplete_count }} incomplete snapshot(s) need review.
+                <form method="post" action="{% url 'resolve_host_incomplete_reviews' host.host %}">
+                  {% csrf_token %}
+                  <button type="submit" class="secondary">Mark reviewed</button>
+                </form>
+              {% endif %}
+              {% if host.retention_warning.error %}
+                {{ host.retention_warning.error }}
+              {% endif %}
+            </div>
+          {% endif %}
+        </article>
+      {% empty %}
+        <p class="muted">No hosts configured yet.</p>
+      {% endfor %}
+    </div>
+  </section>
+
+  <section class="panel">
+    <h2>Latest Runs</h2>
+    <table>
+      <thead>
+        <tr>
+          <th>Host</th>
+          <th>Status</th>
+          <th>Started</th>
+          <th>Ended</th>
+          <th>Snapshot</th>
+        </tr>
+      </thead>
+      <tbody>
+        {% for run in latest_runs %}
+          <tr>
+            <td><a href="{% url 'host_detail' run.host.host %}">{{ run.host.host }}</a></td>
+            <td><a href="{% url 'run_detail' run.id %}"><span class="status {{ run.status }}">{{ run.status }}</span></a></td>
+            <td>{{ run.started_at|default:"" }}</td>
+            <td>{{ run.ended_at|default:"" }}</td>
+            <td>{% if run.snapshot %}<a href="{% url 'snapshot_detail' run.snapshot.id %}">{{ run.snapshot.dirname }}</a>{% else %}<span class="muted">{{ run.snapshot_path }}</span>{% endif %}</td>
+          </tr>
+        {% empty %}
+          <tr><td colspan="5" class="muted">No backup runs recorded yet.</td></tr>
+        {% endfor %}
+      </tbody>
+    </table>
+  </section>
+{% endblock %}

src/pobsync_backend/templates/pobsync_backend/global_form.html

@@ -0,0 +1,68 @@
+{% extends "pobsync_backend/base.html" %}
+
+{% block title %}Global Config{% endblock %}
+
+{% block content %}
+  <h1>{% if global_config %}Global Config{% else %}Create Global Config{% endif %}</h1>
+
+  <section class="actions" aria-label="Global config actions">
+    <a class="button-link" href="{% url 'dashboard' %}">Back to dashboard</a>
+  </section>
+
+  <section class="panel">
+    <h2>{% if global_config %}Edit Global Config{% else %}Create Global Config{% endif %}</h2>
+    <div class="stack spaced">
+      <div><strong>Backup root:</strong> {{ backup_root }}</div>
+      <div class="muted">This path is managed by the service environment and is saved with the config.</div>
+    </div>
+    <form method="post" class="form-grid">
+      {% csrf_token %}
+      {{ form.non_field_errors }}
+
+      {% for field in form %}
+        <div class="field">
+          {{ field.errors }}
+          <label for="{{ field.id_for_label }}">{{ field.label }}</label>
+          {{ field }}
+          {% if field.help_text %}<div class="helptext">{{ field.help_text }}</div>{% endif %}
+        </div>
+      {% endfor %}
+
+      <div class="actions">
+        <button type="submit">Save global config</button>
+      </div>
+    </form>
+  </section>
+
+  {% if config_checks %}
+    <section class="panel">
+      <h2>Config Check</h2>
+      <section class="grid" aria-label="Global config check summary">
+        <div class="metric"><div class="label">OK</div><div class="value">{{ config_check_summary.ok }}</div></div>
+        <div class="metric"><div class="label">Warnings</div><div class="value">{{ config_check_summary.warning }}</div></div>
+        <div class="metric"><div class="label">Failed</div><div class="value">{{ config_check_summary.failed }}</div></div>
+        <div class="metric"><div class="label">Skipped</div><div class="value">{{ config_check_summary.skipped }}</div></div>
+      </section>
+      <table>
+        <thead>
+          <tr>
+            <th>Status</th>
+            <th>Check</th>
+            <th>Message</th>
+            <th>Detail</th>
+          </tr>
+        </thead>
+        <tbody>
+          {% for check in config_checks %}
+            <tr>
+              <td><span class="status {{ check.status }}">{{ check.status }}</span></td>
+              <td>{{ check.name }}</td>
+              <td>{{ check.message }}</td>
+              <td class="muted">{{ check.detail }}</td>
+            </tr>
+          {% endfor %}
+        </tbody>
+      </table>
+    </section>
+  {% endif %}
+{% endblock %}

src/pobsync_backend/templates/pobsync_backend/host_detail.html

@@ -0,0 +1,384 @@
+{% extends "pobsync_backend/base.html" %}
+
+{% block title %}{{ host.host }} | pobsync{% endblock %}
+
+{% block content %}
+  <h1>{{ host.host }}</h1>
+
+  <section class="actions" aria-label="Host actions">
+    <a class="button-link" href="{% url 'edit_host_config' host.host %}">Edit config</a>
+    <form method="post" action="{% url 'discover_host_snapshots' host.host %}">
+      {% csrf_token %}
+      <button type="submit">Discover snapshots</button>
+    </form>
+    <a class="button-link" href="{% url 'host_retention_plan' host.host %}">Plan retention</a>
+    <a class="button-link" href="{% url 'edit_host_schedule' host.host %}">Edit schedule</a>
+    <form method="post" action="{% url 'prepare_host_directories' host.host %}">
+      {% csrf_token %}
+      <button type="submit" class="secondary">Prepare directories</button>
+    </form>
+    <form method="post" action="{% url 'scan_host_known_key' host.host %}">
+      {% csrf_token %}
+      <button type="submit" class="secondary">Scan SSH host key</button>
+    </form>
+    <form method="post" action="{% url 'run_host_preflight' host.host %}">
+      {% csrf_token %}
+      <button type="submit" class="secondary">Run connection preflight</button>
+    </form>
+  </section>
+
+  <section class="grid" aria-label="Host summary">
+    <div class="metric"><div class="label">Snapshots</div><div class="value">{{ counts.snapshots }}</div></div>
+    <div class="metric"><div class="label">Runs</div><div class="value">{{ counts.runs }}</div></div>
+    <div class="metric"><div class="label">Queued</div><div class="value">{{ counts.queued_runs }}</div></div>
+    <div class="metric"><div class="label">Running</div><div class="value">{{ counts.running_runs }}</div></div>
+    <div class="metric"><div class="label">Failed Runs</div><div class="value">{{ counts.failed_runs }}</div></div>
+    <div class="metric"><div class="label">Incomplete</div><div class="value">{{ counts.incomplete_snapshots }}</div></div>
+  </section>
+
+  <div class="two-col">
+    <section class="panel">
+      <h2>Config</h2>
+      <div class="stack">
+        <div><strong>Address:</strong> {{ host.address }}</div>
+        <div><strong>Enabled:</strong> {{ host.enabled|yesno:"yes,no" }}</div>
+        <div><strong>SSH key:</strong> {{ host.ssh_credential|default:"global default" }}</div>
+        <div><strong>SSH:</strong> {{ host.ssh_user|default:"global" }}{% if host.ssh_port %}:{{ host.ssh_port }}{% endif %}</div>
+        <div><strong>Backup source:</strong> {{ host.source_root|default:"global default" }}</div>
+        <div><strong>Retention:</strong> daily {{ host.retention_daily }}, weekly {{ host.retention_weekly }}, monthly {{ host.retention_monthly }}, yearly {{ host.retention_yearly }}</div>
+      </div>
+    </section>
+
+    <section class="panel">
+      <h2>Schedule</h2>
+      {% if schedule %}
+        <div class="stack">
+          <div><strong>Schedule expression:</strong> {{ schedule.cron_expr }}</div>
+          <div class="muted">Evaluated by the pobsync scheduler service.</div>
+          <div><strong>Enabled:</strong> {{ schedule.enabled|yesno:"yes,no" }}</div>
+          <div><strong>Next run:</strong> {% if next_run_at %}{{ next_run_at|date:"Y-m-d H:i T" }} <span class="muted">{{ scheduler_timezone }}</span>{% endif %}</div>
+          <div><strong>Prune:</strong> {{ schedule.prune|yesno:"yes,no" }}</div>
+          <div><strong>Last status:</strong> {{ schedule.last_status|default:"" }}</div>
+          <div><strong>Last started:</strong> {{ schedule.last_started_at|default:"" }}</div>
+          <div><strong>Last finished:</strong> {{ schedule.last_finished_at|default:"" }}</div>
+        </div>
+      {% else %}
+        <p class="muted">No schedule configured.</p>
+      {% endif %}
+    </section>
+  </div>
+
+  {% if retention_warning.has_warning %}
+    <section class="panel highlight warning">
+      <h2>Retention Warnings</h2>
+      <div class="stack">
+        {% if retention_warning.prune_exceeded %}
+          <div>
+            Scheduled pruning would delete {{ retention_warning.delete_count }} snapshot(s), above max delete
+            {{ retention_warning.max_delete }}. Scheduled pruning will refuse this plan until the limit or retention
+            selection is adjusted.
+          </div>
+        {% endif %}
+        {% if retention_warning.incomplete_count %}
+          <div>
+            {{ retention_warning.incomplete_count }} incomplete snapshot(s) exist. Retention does not delete incomplete
+            snapshots automatically; inspect them before cleanup.
+          </div>
+          <form method="post" action="{% url 'resolve_host_incomplete_reviews' host.host %}">
+            {% csrf_token %}
+            <button type="submit" class="secondary">Mark incomplete reviewed</button>
+          </form>
+        {% endif %}
+        {% if retention_warning.error %}
+          <div>{{ retention_warning.error }}</div>
+        {% endif %}
+      </div>
+    </section>
+  {% endif %}
+
+  {% if effective_config %}
+    <section class="panel">
+      <h2>Effective Config</h2>
+      <div class="two-col">
+        <div class="stack">
+          <div><strong>Backup source:</strong> {{ effective_config.source_root }}</div>
+          <div><strong>Destination subdir:</strong> {{ effective_config.destination_subdir|default:"none" }}</div>
+          <div><strong>SSH:</strong> {{ effective_config.ssh.user }}@{{ host.address }}:{{ effective_config.ssh.port }}</div>
+          <div><strong>SSH key:</strong> {{ effective_config.ssh.credential|default:"none selected" }}</div>
+          <div><strong>SSH options:</strong> {{ effective_config.ssh.options|join:" " }}</div>
+          <div><strong>Rsync binary:</strong> {{ effective_config.rsync.binary }}</div>
+          <div><strong>Rsync args:</strong> {{ effective_config.rsync.args|join:" " }}</div>
+          <div><strong>Timeout:</strong> {{ effective_config.rsync.timeout_seconds }}s</div>
+          <div><strong>Bandwidth limit:</strong> {{ effective_config.rsync.bwlimit_kbps }} KB/s</div>
+          <div>
+            <strong>Retention:</strong>
+            d{{ effective_config.retention.daily }}
+            w{{ effective_config.retention.weekly }}
+            m{{ effective_config.retention.monthly }}
+            y{{ effective_config.retention.yearly }}
+          </div>
+        </div>
+        <div class="stack">
+          <div><strong>Includes:</strong> {{ effective_config.includes|length }}</div>
+          {% if effective_config.includes %}
+            <pre>{{ effective_config.includes|join:"&#10;" }}</pre>
+          {% else %}
+            <div class="muted">No include rules configured.</div>
+          {% endif %}
+          <div><strong>Excludes:</strong> {{ effective_config.excludes|length }}</div>
+          {% if effective_config.excludes %}
+            <pre>{{ effective_config.excludes|join:"&#10;" }}</pre>
+          {% else %}
+            <div class="muted">No exclude rules configured.</div>
+          {% endif %}
+        </div>
+      </div>
+    </section>
+  {% endif %}
+
+  <section class="panel">
+    <h2>Snapshot Discovery</h2>
+    <div class="stack">
+      <div><strong>Backup root:</strong> {{ discovery.backup_root|default:"" }}</div>
+      <div><strong>Host root:</strong> {{ discovery.host_root|default:"" }}</div>
+      <div><strong>Status:</strong> {{ discovery.message }}</div>
+      {% if discovery.kind_counts %}
+        <div><strong>On disk:</strong>
+          scheduled {{ discovery.kind_counts.scheduled|default:0 }},
+          manual {{ discovery.kind_counts.manual|default:0 }},
+          incomplete {{ discovery.kind_counts.incomplete|default:0 }}
+        </div>
+      {% endif %}
+    </div>
+  </section>
+
+  {% if stats_summary.runs %}
+    <section class="panel">
+      <h2>Backup Trends</h2>
+      <section class="grid" aria-label="Host backup trend summary">
+        <div class="metric"><div class="label">Avg New Data</div><div class="value">{{ stats_summary.avg_literal_data_bytes|filesizeformat }}</div></div>
+        <div class="metric"><div class="label">Avg Daily New</div><div class="value">{{ stats_summary.avg_daily_literal_data_bytes|filesizeformat }}</div></div>
+        <div class="metric"><div class="label">Total New Data</div><div class="value">{{ stats_summary.total_literal_data_bytes|filesizeformat }}</div></div>
+        <div class="metric"><div class="label">Matched Data</div><div class="value">{{ stats_summary.total_matched_data_bytes|filesizeformat }}</div></div>
+        <div class="metric"><div class="label">Latest Duration</div><div class="value">{{ stats_summary.latest_run.duration_seconds|default:"" }}{% if stats_summary.latest_run.duration_seconds is not None %}s{% endif %}</div></div>
+      </section>
+      <table>
+        <thead>
+          <tr>
+            <th>Run</th>
+            <th>Type</th>
+            <th>Started</th>
+            <th>Duration</th>
+            <th>Files</th>
+            <th>New Data</th>
+            <th>Matched</th>
+            <th>Trend</th>
+            <th>Snapshot</th>
+          </tr>
+        </thead>
+        <tbody>
+          {% for run in stats_summary.runs %}
+            <tr>
+              <td><a href="{% url 'run_detail' run.id %}">Run {{ run.id }}</a></td>
+              <td>{{ run.run_type }}</td>
+              <td>{{ run.started_at|default:"" }}</td>
+              <td>{{ run.duration_seconds|default:"" }}{% if run.duration_seconds is not None %}s{% endif %}</td>
+              <td>{{ run.rsync.files_total|default:"" }}</td>
+              <td>{{ run.rsync.literal_data_bytes|filesizeformat }}</td>
+              <td>{{ run.rsync.matched_data_bytes|filesizeformat }}</td>
+              <td>
+                <div class="trend-bars" aria-label="Run data trend">
+                  <div class="trend-bar" title="New data"><span style="width: {{ run.literal_percent }}%"></span></div>
+                  <div class="trend-bar matched" title="Matched data"><span style="width: {{ run.matched_percent }}%"></span></div>
+                  <div class="trend-legend"><span>new</span><span>matched</span></div>
+                </div>
+              </td>
+              <td>{% if run.snapshot %}<a href="{% url 'snapshot_detail' run.snapshot.id %}">{{ run.snapshot.dirname }}</a>{% else %}<span class="muted">{{ run.snapshot_path }}</span>{% endif %}</td>
+            </tr>
+          {% endfor %}
+        </tbody>
+      </table>
+    </section>
+  {% endif %}
+
+  <section class="panel">
+    <h2>Host Check</h2>
+    <section class="grid" aria-label="Host check summary">
+      <div class="metric"><div class="label">OK</div><div class="value">{{ host_check_summary.ok }}</div></div>
+      <div class="metric"><div class="label">Warnings</div><div class="value">{{ host_check_summary.warning }}</div></div>
+      <div class="metric"><div class="label">Failed</div><div class="value">{{ host_check_summary.failed }}</div></div>
+      <div class="metric"><div class="label">Skipped</div><div class="value">{{ host_check_summary.skipped }}</div></div>
+    </section>
+    <table>
+      <thead>
+        <tr>
+          <th>Status</th>
+          <th>Check</th>
+          <th>Message</th>
+          <th>Detail</th>
+        </tr>
+      </thead>
+      <tbody>
+        {% for check in host_checks %}
+          <tr>
+            <td><span class="status {{ check.status }}">{{ check.status }}</span></td>
+            <td>{{ check.name }}</td>
+            <td>{{ check.message }}</td>
+            <td class="muted">{{ check.detail }}</td>
+          </tr>
+        {% endfor %}
+      </tbody>
+    </table>
+  </section>
+
+  {% if last_preflight %}
+    <section class="panel">
+      <h2>Connection Preflight</h2>
+      <div class="stack spaced">
+        <div><strong>Status:</strong> <span class="status {% if last_preflight.ok %}ok{% else %}failed{% endif %}">{% if last_preflight.ok %}ok{% else %}failed{% endif %}</span></div>
+        <div><strong>Target:</strong> {{ last_preflight.target }}</div>
+        <div><strong>Backup source:</strong> {{ last_preflight.source_root }}</div>
+        <div><strong>Remote rsync:</strong> {{ last_preflight.rsync_binary }}</div>
+      </div>
+      <table>
+        <thead>
+          <tr>
+            <th>Status</th>
+            <th>Check</th>
+            <th>Message</th>
+            <th>Detail</th>
+          </tr>
+        </thead>
+        <tbody>
+          {% for check in last_preflight.checks %}
+            <tr>
+              <td><span class="status {% if check.ok %}ok{% else %}failed{% endif %}">{% if check.ok %}ok{% else %}failed{% endif %}</span></td>
+              <td>{{ check.name }}</td>
+              <td>{{ check.message }}</td>
+              <td class="muted">{{ check.detail }}</td>
+            </tr>
+          {% endfor %}
+        </tbody>
+      </table>
+    </section>
+  {% endif %}
+
+  <section class="panel">
+    <h2>Backup Control</h2>
+    <div class="operator-state">
+      {% if active_run %}
+        <span class="status {{ active_run.status }}">{{ active_run.status }}</span>
+        <a href="{% url 'run_detail' active_run.id %}">Run {{ active_run.id }}</a>
+      {% elif has_global_config and host.enabled %}
+        <span class="status {{ backup_gate.state }}">{{ backup_gate.state }}</span>
+        <span class="muted">{{ backup_gate.message }}</span>
+      {% elif not host.enabled %}
+        <span class="status failed">disabled</span>
+      {% elif not has_global_config %}
+        <span class="status failed">missing global config</span>
+      {% endif %}
+    </div>
+
+    <section class="actions inline" aria-label="Quick backup actions">
+      <form class="inline-form" method="post" action="{% url 'queue_manual_backup' host.host %}">
+        {% csrf_token %}
+        <input type="hidden" name="dry_run" value="on">
+        <input type="hidden" name="verbose_output" value="on">
+        <input type="hidden" name="prune_max_delete" value="10">
+        <button type="submit" class="secondary" {% if not can_queue_dry_run %}disabled{% endif %}>Queue dry-run</button>
+      </form>
+      <form class="inline-form" method="post" action="{% url 'queue_manual_backup' host.host %}">
+        {% csrf_token %}
+        <input type="hidden" name="prune_max_delete" value="10">
+        <button type="submit" {% if not can_queue_real_backup %}disabled{% endif %}>Queue backup</button>
+      </form>
+    </section>
+
+    {% if active_run %}
+      <p class="muted">Wait for the active run to finish, or cancel it from the run detail page.</p>
+    {% elif not can_queue_dry_run or not can_queue_real_backup %}
+      {% if not has_global_config %}
+        <p class="muted">Create the default global config before queueing backups.</p>
+      {% elif not host.enabled %}
+        <p class="muted">Enable this host before queueing backups.</p>
+      {% elif backup_gate.real_blockers %}
+        <p class="muted">Real backups are blocked by failed preflight checks. Dry-runs may still be available when storage-only checks fail.</p>
+      {% endif %}
+    {% endif %}
+
+    <h3>Advanced Options</h3>
+    <form method="post" action="{% url 'queue_manual_backup' host.host %}" class="form-grid">
+      {% csrf_token %}
+      {{ manual_backup_form.non_field_errors }}
+
+      {% for field in manual_backup_form %}
+        <div class="field">
+          {{ field.errors }}
+          <label for="{{ field.id_for_label }}">{{ field.label }}</label>
+          {{ field }}
+          {% if field.help_text %}<div class="helptext">{{ field.help_text }}</div>{% endif %}
+        </div>
+      {% endfor %}
+
+      <div class="actions">
+        <button type="submit" {% if not can_queue_dry_run and not can_queue_real_backup %}disabled{% endif %}>Queue with options</button>
+      </div>
+    </form>
+  </section>
+
+  <section class="panel">
+    <h2>Latest Runs</h2>
+    <table>
+      <thead>
+        <tr>
+          <th>Status</th>
+          <th>Started</th>
+          <th>Ended</th>
+          <th>Snapshot</th>
+          <th>Base</th>
+        </tr>
+      </thead>
+      <tbody>
+        {% for run in latest_runs %}
+          <tr>
+            <td><a href="{% url 'run_detail' run.id %}"><span class="status {{ run.status }}">{{ run.status }}</span></a></td>
+            <td>{{ run.started_at|default:"" }}</td>
+            <td>{{ run.ended_at|default:"" }}</td>
+            <td>{% if run.snapshot %}<a href="{% url 'snapshot_detail' run.snapshot.id %}">{{ run.snapshot.dirname }}</a>{% else %}<span class="muted">{{ run.snapshot_path }}</span>{% endif %}</td>
+            <td>{{ run.base_path|default:"" }}</td>
+          </tr>
+        {% empty %}
+          <tr><td colspan="5" class="muted">No backup runs recorded for this host.</td></tr>
+        {% endfor %}
+      </tbody>
+    </table>
+  </section>
+
+  <section class="panel">
+    <h2>Snapshots</h2>
+    <table>
+      <thead>
+        <tr>
+          <th>Kind</th>
+          <th>Status</th>
+          <th>Started</th>
+          <th>Dirname</th>
+          <th>Base</th>
+        </tr>
+      </thead>
+      <tbody>
+        {% for snapshot in snapshots %}
+          <tr>
+            <td>{{ snapshot.kind }}</td>
+            <td>{{ snapshot.status }}</td>
+            <td>{{ snapshot.started_at|default:"" }}</td>
+            <td><a href="{% url 'snapshot_detail' snapshot.id %}">{{ snapshot.dirname }}</a></td>
+            <td>{% if snapshot.base %}<a href="{% url 'snapshot_detail' snapshot.base.id %}">{{ snapshot.base.dirname }}</a>{% else %}{{ snapshot.base_dirname }}{% endif %}</td>
+          </tr>
+        {% empty %}
+          <tr><td colspan="5" class="muted">No snapshots discovered for this host.</td></tr>
+        {% endfor %}
+      </tbody>
+    </table>
+  </section>
+{% endblock %}

src/pobsync_backend/templates/pobsync_backend/host_form.html

@@ -0,0 +1,68 @@
+{% extends "pobsync_backend/base.html" %}
+
+{% block title %}{% if host %}Config | {{ host.host }}{% else %}New Host{% endif %}{% endblock %}
+
+{% block content %}
+  <h1>{% if host %}Config: {{ host.host }}{% else %}New Host{% endif %}</h1>
+
+  <section class="actions" aria-label="Config actions">
+    {% if host %}
+      <a class="button-link" href="{% url 'host_detail' host.host %}">Back to host</a>
+    {% else %}
+      <a class="button-link" href="{% url 'dashboard' %}">Back to dashboard</a>
+    {% endif %}
+  </section>
+
+  <section class="panel">
+    <h2>{% if host %}Edit Host Config{% else %}Create Host Config{% endif %}</h2>
+    <form method="post" class="form-grid">
+      {% csrf_token %}
+      {{ form.non_field_errors }}
+
+      {% for field in form %}
+        <div class="field">
+          {{ field.errors }}
+          <label for="{{ field.id_for_label }}">{{ field.label }}</label>
+          {{ field }}
+          {% if field.help_text %}<div class="helptext">{{ field.help_text }}</div>{% endif %}
+        </div>
+      {% endfor %}
+
+      <div class="actions">
+        <button type="submit">{% if host %}Save config{% else %}Create host{% endif %}</button>
+      </div>
+    </form>
+  </section>
+
+  {% if config_checks %}
+    <section class="panel">
+      <h2>Effective Config Check</h2>
+      <section class="grid" aria-label="Host config check summary">
+        <div class="metric"><div class="label">OK</div><div class="value">{{ config_check_summary.ok }}</div></div>
+        <div class="metric"><div class="label">Warnings</div><div class="value">{{ config_check_summary.warning }}</div></div>
+        <div class="metric"><div class="label">Failed</div><div class="value">{{ config_check_summary.failed }}</div></div>
+        <div class="metric"><div class="label">Skipped</div><div class="value">{{ config_check_summary.skipped }}</div></div>
+      </section>
+      <table>
+        <thead>
+          <tr>
+            <th>Status</th>
+            <th>Check</th>
+            <th>Message</th>
+            <th>Detail</th>
+          </tr>
+        </thead>
+        <tbody>
+          {% for check in config_checks %}
+            <tr>
+              <td><span class="status {{ check.status }}">{{ check.status }}</span></td>
+              <td>{{ check.name }}</td>
+              <td>{{ check.message }}</td>
+              <td class="muted">{{ check.detail }}</td>
+            </tr>
+          {% endfor %}
+        </tbody>
+      </table>
+    </section>
+  {% endif %}
+{% endblock %}

src/pobsync_backend/templates/pobsync_backend/logs.html

@@ -0,0 +1,68 @@
+{% extends "pobsync_backend/base.html" %}
+
+{% block title %}Logs | pobsync{% endblock %}
+
+{% block content %}
+  <h1>Logs</h1>
+
+  <section class="actions" aria-label="Log actions">
+    <a class="button-link secondary" href="{% url 'dashboard' %}">Back to dashboard</a>
+  </section>
+
+  <section class="panel">
+    <h2>Filter</h2>
+    <form method="get" class="form-grid">
+      <div class="field">
+        <label for="unit">Unit</label>
+        <select id="unit" name="unit">
+          <option value="">All pobsync units</option>
+          {% for unit in units %}
+            <option value="{{ unit }}" {% if selected_unit == unit %}selected{% endif %}>{{ unit }}</option>
+          {% endfor %}
+        </select>
+      </div>
+      <div class="field">
+        <label for="priority">Priority</label>
+        <select id="priority" name="priority">
+          {% for value, label in priorities.items %}
+            <option value="{{ value }}" {% if selected_priority == value %}selected{% endif %}>{{ label }}</option>
+          {% endfor %}
+        </select>
+      </div>
+      <div class="field">
+        <label for="window">Time window</label>
+        <select id="window" name="window">
+          {% for value, label in time_windows.items %}
+            <option value="{{ value }}" {% if selected_window == value %}selected{% endif %}>{{ label }}</option>
+          {% endfor %}
+        </select>
+      </div>
+      <div class="field">
+        <label for="host">Host contains</label>
+        <input id="host" name="host" value="{{ host_filter }}" placeholder="web-01.example.test">
+      </div>
+      <div class="field">
+        <label for="run">Run</label>
+        <input id="run" name="run" value="{{ run_filter }}" inputmode="numeric" placeholder="12">
+      </div>
+      <div class="field">
+        <label for="q">Message contains</label>
+        <input id="q" name="q" value="{{ query }}">
+      </div>
+      <div class="actions">
+        <button type="submit">Filter logs</button>
+      </div>
+    </form>
+  </section>
+
+  <section class="panel">
+    <h2>Messages</h2>
+    {% if error %}
+      <p class="status failed">{{ error }}</p>
+    {% else %}
+      <pre>{% for line in lines %}{{ line }}
+{% empty %}No log messages matched the current filter.
+{% endfor %}</pre>
+    {% endif %}
+  </section>
+{% endblock %}

src/pobsync_backend/templates/pobsync_backend/purged_snapshots.html

@@ -0,0 +1,74 @@
+{% extends "pobsync_backend/base.html" %}
+
+{% block title %}Purged Snapshots | pobsync{% endblock %}
+
+{% block content %}
+  <h1>Purged Snapshots</h1>
+
+  <section class="actions" aria-label="Purged snapshot actions">
+    <a class="button-link secondary" href="{% url 'dashboard' %}">Back to dashboard</a>
+  </section>
+
+  <section class="panel">
+    <h2>Filters</h2>
+    <form method="get" class="form-grid">
+      <div class="field">
+        <label for="host">Host</label>
+        <select id="host" name="host">
+          <option value="">All hosts</option>
+          {% for host in hosts %}
+            <option value="{{ host.host }}" {% if selected_host == host.host %}selected{% endif %}>{{ host.host }}</option>
+          {% endfor %}
+        </select>
+      </div>
+      <div class="field">
+        <label for="action">Action</label>
+        <select id="action" name="action">
+          <option value="">All actions</option>
+          {% for value, label in actions %}
+            <option value="{{ value }}" {% if selected_action == value %}selected{% endif %}>{{ label }}</option>
+          {% endfor %}
+        </select>
+      </div>
+      <div class="actions">
+        <button type="submit">Apply filters</button>
+        <a class="button-link secondary" href="{% url 'purged_snapshots' %}">Clear</a>
+      </div>
+    </form>
+  </section>
+
+  <section class="panel">
+    <h2>Purged Snapshot History</h2>
+    <p class="muted">Showing up to 200 of {{ total_count }} purged snapshot record(s).</p>
+    <table>
+      <thead>
+        <tr>
+          <th>Purged</th>
+          <th>Host</th>
+          <th>Kind</th>
+          <th>Dirname</th>
+          <th>Action</th>
+          <th>Reason</th>
+          <th>Triggered by</th>
+          <th>Path</th>
+        </tr>
+      </thead>
+      <tbody>
+        {% for snapshot in purged_snapshots %}
+          <tr>
+            <td>{{ snapshot.purged_at }}</td>
+            <td>{% if snapshot.host %}<a href="{% url 'host_detail' snapshot.host.host %}">{{ snapshot.host_name }}</a>{% else %}{{ snapshot.host_name }}{% endif %}</td>
+            <td>{{ snapshot.kind }}</td>
+            <td>{{ snapshot.dirname }}</td>
+            <td><span class="status skipped">{{ snapshot.get_action_display }}</span></td>
+            <td>{{ snapshot.reason|default:"" }}</td>
+            <td>{{ snapshot.triggered_by|default:"" }}</td>
+            <td class="muted">{{ snapshot.path }}</td>
+          </tr>
+        {% empty %}
+          <tr><td colspan="8" class="muted">No purged snapshots recorded yet.</td></tr>
+        {% endfor %}
+      </tbody>
+    </table>
+  </section>
+{% endblock %}

src/pobsync_backend/templates/pobsync_backend/retention_plan.html

@@ -0,0 +1,229 @@
+{% extends "pobsync_backend/base.html" %}
+
+{% block title %}Retention plan | {{ host.host }}{% endblock %}
+
+{% block content %}
+  <h1>Retention Plan: {{ host.host }}</h1>
+
+  <section class="actions" aria-label="Retention filters">
+    <a class="button-link" href="{% url 'host_detail' host.host %}">Back to host</a>
+    <a class="button-link" href="{% url 'host_retention_plan' host.host %}?kind=scheduled">Scheduled</a>
+    <a class="button-link" href="{% url 'host_retention_plan' host.host %}?kind=manual">Manual</a>
+    <a class="button-link" href="{% url 'host_retention_plan' host.host %}?kind=all">All</a>
+    <a class="button-link" href="{% url 'host_retention_plan' host.host %}?kind={{ kind }}&protect_bases=1">Protect bases</a>
+  </section>
+
+  <section class="grid" aria-label="Retention plan summary">
+    <div class="metric"><div class="label">Kind</div><div class="value">{{ plan.kind }}</div></div>
+    <div class="metric"><div class="label">Keep</div><div class="value">{{ plan.keep|length }}</div></div>
+    <div class="metric"><div class="label">Would Delete</div><div class="value">{{ plan.delete|length }}</div></div>
+    <div class="metric"><div class="label">Scheduled Limit</div><div class="value">{{ scheduled_prune_limit|default:"none" }}</div></div>
+    <div class="metric"><div class="label">Incomplete</div><div class="value">{{ plan.incomplete|length }}</div></div>
+  </section>
+
+  {% if scheduled_prune_exceeded %}
+    <section class="panel highlight warning">
+      <h2>Scheduled Prune Limit</h2>
+      <p>
+        This plan would delete {{ plan.delete|length }} snapshot(s), which exceeds the scheduled prune limit of
+        {{ scheduled_prune_limit }}. Scheduled pruning will refuse to apply this plan until the limit or retention
+        selection is adjusted.
+      </p>
+    </section>
+  {% endif %}
+
+  {% if plan.incomplete %}
+    <section class="panel highlight warning">
+      <h2>Incomplete Snapshots</h2>
+      <p>
+        {{ plan.incomplete|length }} incomplete snapshot(s) exist for this host. Retention does not delete incomplete
+        snapshots automatically because they can indicate an interrupted backup that should be inspected first.
+      </p>
+      <p>
+        After inspection, use the dedicated cleanup form below to delete only incomplete snapshot directories and their
+        tracking records. Successful scheduled and manual snapshots are not touched by this cleanup.
+      </p>
+    </section>
+  {% endif %}
+
+  <section class="panel">
+    <h2>Policy</h2>
+    <div class="stack">
+      <div><strong>Daily:</strong> {{ plan.retention.daily }}</div>
+      <div><strong>Weekly:</strong> {{ plan.retention.weekly }}</div>
+      <div><strong>Monthly:</strong> {{ plan.retention.monthly }}</div>
+      <div><strong>Yearly:</strong> {{ plan.retention.yearly }}</div>
+      <div><strong>Protect bases:</strong> {{ protect_bases|yesno:"yes,no" }}</div>
+      <div class="muted">
+        {% if protect_bases %}
+          Base snapshots referenced by kept snapshots are also kept and marked with a base-of reason.
+        {% else %}
+          Base snapshots are only kept when they match the regular retention policy.
+        {% endif %}
+      </div>
+      {% if schedule %}
+        <div><strong>Schedule pruning:</strong> {{ schedule.prune|yesno:"enabled,disabled" }}</div>
+        <div><strong>Schedule max delete:</strong> {{ schedule.prune_max_delete }}</div>
+      {% endif %}
+    </div>
+  </section>
+
+  <section class="panel">
+    <h2>Would Delete</h2>
+    <table>
+      <thead>
+        <tr>
+          <th>Kind</th>
+          <th>Dirname</th>
+          <th>Started</th>
+          <th>Status</th>
+          <th>Reason</th>
+          <th>Path</th>
+        </tr>
+      </thead>
+      <tbody>
+        {% for snapshot in plan.delete %}
+          <tr>
+            <td>{{ snapshot.kind }}</td>
+            <td>{{ snapshot.dirname }}</td>
+            <td>{{ snapshot.dt }}</td>
+            <td>{{ snapshot.status|default:"" }}</td>
+            <td>{{ snapshot.reason }}</td>
+            <td class="muted">{{ snapshot.path }}</td>
+          </tr>
+        {% empty %}
+          <tr><td colspan="6" class="muted">Retention would not delete snapshots for this selection.</td></tr>
+        {% endfor %}
+      </tbody>
+    </table>
+  </section>
+
+  {% if plan.delete %}
+    <section class="panel">
+      <h2>Apply Retention</h2>
+      <form method="post" action="{% url 'apply_host_retention' host.host %}" class="form-grid">
+        {% csrf_token %}
+        {{ apply_form.non_field_errors }}
+        {{ apply_form.kind.as_hidden }}
+
+        <div class="field">
+          {{ apply_form.max_delete.errors }}
+          <label for="{{ apply_form.max_delete.id_for_label }}">Max delete</label>
+          {{ apply_form.max_delete }}
+          <div class="helptext">Must be at least {{ plan.delete|length }} for the snapshots shown in Would Delete.</div>
+        </div>
+
+        <div class="field">
+          {{ apply_form.protect_bases.errors }}
+          <label for="{{ apply_form.protect_bases.id_for_label }}">Protect bases</label>
+          {{ apply_form.protect_bases }}
+        </div>
+
+        <div class="field">
+          {{ apply_form.confirm_host.errors }}
+          <label for="{{ apply_form.confirm_host.id_for_label }}">Confirm host</label>
+          {{ apply_form.confirm_host }}
+          <div class="helptext">{{ apply_form.confirm_host.help_text }}</div>
+        </div>
+
+        <div class="field">
+          {{ apply_form.confirm_delete_count.errors }}
+          <label for="{{ apply_form.confirm_delete_count.id_for_label }}">Confirm delete count</label>
+          {{ apply_form.confirm_delete_count }}
+          <div class="helptext">{{ apply_form.confirm_delete_count.help_text }}</div>
+        </div>
+
+        <div class="actions">
+          <button type="submit">Apply retention</button>
+        </div>
+      </form>
+    </section>
+  {% endif %}
+
+  <section class="panel">
+    <h2>Keep Reasons</h2>
+    <table>
+      <thead>
+        <tr>
+          <th>Kind</th>
+          <th>Dirname</th>
+          <th>Started</th>
+          <th>Status</th>
+          <th>Reasons</th>
+        </tr>
+      </thead>
+      <tbody>
+        {% for snapshot in plan.keep_items %}
+          <tr>
+            <td>{{ snapshot.kind }}</td>
+            <td>{{ snapshot.dirname }}</td>
+            <td>{{ snapshot.dt }}</td>
+            <td>{{ snapshot.status|default:"" }}</td>
+            <td>{{ snapshot.reason }}</td>
+          </tr>
+        {% empty %}
+          <tr><td colspan="5" class="muted">No snapshots matched this retention selection.</td></tr>
+        {% endfor %}
+      </tbody>
+    </table>
+  </section>
+
+  {% if plan.incomplete %}
+    <section class="panel">
+      <h2>Incomplete Snapshots</h2>
+      <table>
+        <thead>
+          <tr>
+            <th>Dirname</th>
+            <th>Started</th>
+            <th>Status</th>
+            <th>Reason</th>
+            <th>Path</th>
+          </tr>
+        </thead>
+        <tbody>
+          {% for snapshot in plan.incomplete %}
+            <tr>
+              <td>{{ snapshot.dirname }}</td>
+              <td>{{ snapshot.dt }}</td>
+              <td>{{ snapshot.status|default:"" }}</td>
+              <td>{{ snapshot.reason }}</td>
+              <td class="muted">{{ snapshot.path }}</td>
+            </tr>
+          {% endfor %}
+        </tbody>
+      </table>
+
+      <h3>Cleanup Incomplete Snapshots</h3>
+      <form method="post" action="{% url 'cleanup_host_incomplete_snapshots' host.host %}" class="form-grid">
+        {% csrf_token %}
+        {{ incomplete_cleanup_form.non_field_errors }}
+
+        <div class="field">
+          {{ incomplete_cleanup_form.max_delete.errors }}
+          <label for="{{ incomplete_cleanup_form.max_delete.id_for_label }}">Max delete</label>
+          {{ incomplete_cleanup_form.max_delete }}
+          <div class="helptext">{{ incomplete_cleanup_form.max_delete.help_text }}</div>
+        </div>
+
+        <div class="field">
+          {{ incomplete_cleanup_form.confirm_host.errors }}
+          <label for="{{ incomplete_cleanup_form.confirm_host.id_for_label }}">Confirm host</label>
+          {{ incomplete_cleanup_form.confirm_host }}
+          <div class="helptext">{{ incomplete_cleanup_form.confirm_host.help_text }}</div>
+        </div>
+
+        <div class="field">
+          {{ incomplete_cleanup_form.confirm_delete_count.errors }}
+          <label for="{{ incomplete_cleanup_form.confirm_delete_count.id_for_label }}">Confirm incomplete count</label>
+          {{ incomplete_cleanup_form.confirm_delete_count }}
+          <div class="helptext">{{ incomplete_cleanup_form.confirm_delete_count.help_text }}</div>
+        </div>
+
+        <div class="actions">
+          <button type="submit">Delete incomplete snapshots</button>
+        </div>
+      </form>
+    </section>
+  {% endif %}
+{% endblock %}

src/pobsync_backend/templates/pobsync_backend/run_detail.html

@@ -0,0 +1,243 @@
+{% extends "pobsync_backend/base.html" %}
+
+{% block title %}Run {{ run.id }} | {{ run.host.host }}{% endblock %}
+
+{% block content %}
+  <h1>Run {{ run.id }}</h1>
+
+  <section class="actions" aria-label="Run actions">
+    <a class="button-link" href="{% url 'host_detail' run.host.host %}">Back to host</a>
+    {% if can_cancel %}
+      <form method="post" action="{% url 'cancel_run' run.id %}">
+        {% csrf_token %}
+        <button type="submit" class="secondary">Cancel run</button>
+      </form>
+    {% endif %}
+    {% if run.status == "failed" or run.status == "warning" %}
+      {% if not run.reviewed_at %}
+        <form method="post" action="{% url 'resolve_run_review' run.id %}">
+          {% csrf_token %}
+          <button type="submit" class="secondary">Mark reviewed</button>
+        </form>
+      {% endif %}
+    {% endif %}
+  </section>
+
+  <section class="grid" aria-label="Run summary">
+    <div class="metric"><div class="label">Host</div><div class="value">{{ run.host.host }}</div></div>
+    <div class="metric"><div class="label">Status</div><div class="value"><span class="status {{ run.status }}">{{ run.status }}</span></div></div>
+    <div class="metric"><div class="label">Type</div><div class="value">{{ run.run_type }}</div></div>
+    <div class="metric"><div class="label">Rsync</div><div class="value">{{ run.rsync_exit_code|default:"" }}</div></div>
+  </section>
+
+  {% if failure %}
+    <section class="panel highlight failed">
+      <h2>Failure</h2>
+      <div class="stack">
+        <div><strong>Category:</strong> {{ failure.category|default:"unknown" }}</div>
+        <div><strong>Summary:</strong> {{ failure_summary }}</div>
+        <div><strong>Hint:</strong> {{ failure.hint|default:"" }}</div>
+      </div>
+    </section>
+  {% endif %}
+
+  {% if run.reviewed_at %}
+    <section class="panel highlight success">
+      <h2>Review</h2>
+      <div class="stack">
+        <div><strong>Reviewed:</strong> {{ run.reviewed_at }}</div>
+        <div><strong>Reviewed by:</strong> {{ run.reviewed_by|default:"unknown" }}</div>
+      </div>
+    </section>
+  {% endif %}
+
+  {% if dry_run_summary %}
+    <section class="panel highlight {{ dry_run_summary.highlight_class }}">
+      <h2>Dry Run Summary</h2>
+      <section class="grid" aria-label="Dry run summary">
+        <div class="metric"><div class="label">Status</div><div class="value">{{ dry_run_summary.status }}</div></div>
+        <div class="metric"><div class="label">Files Seen</div><div class="value">{{ dry_run_summary.files_seen|default:"unknown" }}</div></div>
+        <div class="metric"><div class="label">Would Transfer</div><div class="value">{{ dry_run_summary.files_would_transfer|default:"unknown" }}</div></div>
+        <div class="metric"><div class="label">Transfer Estimate</div><div class="value">{{ dry_run_summary.transfer_estimate_bytes|filesizeformat }}</div></div>
+        <div class="metric"><div class="label">Total Size</div><div class="value">{{ dry_run_summary.total_file_size_bytes|filesizeformat }}</div></div>
+        <div class="metric"><div class="label">Link-Dest Saving</div><div class="value">{{ dry_run_summary.link_dest_estimated_savings_bytes|filesizeformat }}</div></div>
+      </section>
+      <div class="stack">
+        {% if dry_run_summary.duration_seconds is not None %}
+          <div><strong>Duration:</strong> {{ dry_run_summary.duration_seconds }}s</div>
+        {% endif %}
+        <div>
+          <strong>Log:</strong>
+          {% if dry_run_summary.log_available %}
+            <a href="{% url 'run_rsync_log' run.id %}">Open full rsync log</a>
+          {% elif rsync_log_path %}
+            <span class="muted">{{ rsync_log_path }} (missing)</span>
+          {% else %}
+            <span class="muted">not recorded yet</span>
+          {% endif %}
+        </div>
+        {% if dry_run_summary.warnings %}
+          <div><strong>Warnings:</strong></div>
+          <ul>
+            {% for warning in dry_run_summary.warnings %}
+              <li>{{ warning }}</li>
+            {% endfor %}
+          </ul>
+        {% else %}
+          <div><strong>Warnings:</strong> none recorded</div>
+        {% endif %}
+      </div>
+    </section>
+  {% endif %}
+
+  <div class="two-col">
+    <section class="panel">
+      <h2>Timing</h2>
+      <div class="stack">
+        <div><strong>Created:</strong> {{ run.created_at }}</div>
+        <div><strong>Started:</strong> {{ run.started_at|default:"" }}</div>
+        <div><strong>Ended:</strong> {{ run.ended_at|default:"" }}</div>
+        {% if execution %}
+          <div><strong>Worker:</strong> {{ execution.worker_host|default:"unknown" }}{% if execution.worker_pid %} pid {{ execution.worker_pid }}{% endif %}</div>
+          <div><strong>Worker heartbeat:</strong> {{ execution.heartbeat_at|default:"" }}</div>
+        {% endif %}
+      </div>
+    </section>
+
+    <section class="panel">
+      <h2>Snapshot</h2>
+      <div class="stack">
+        <div><strong>Snapshot:</strong> {% if run.snapshot %}<a href="{% url 'snapshot_detail' run.snapshot.id %}">{{ run.snapshot.dirname }}</a>{% else %}{{ run.snapshot_path|default:"" }}{% endif %}</div>
+        <div><strong>Base:</strong> {{ run.base_path|default:"" }}</div>
+        <div>
+          <strong>Rsync log:</strong>
+          {% if rsync_log_exists %}
+            <a href="{% url 'run_rsync_log' run.id %}">{{ rsync_log_path }}</a>
+          {% elif rsync_log_path %}
+            <span class="muted">{{ rsync_log_path }} (missing)</span>
+          {% else %}
+            <span class="muted">none</span>
+          {% endif %}
+        </div>
+      </div>
+    </section>
+  </div>
+
+  {% if requested %}
+    <section class="panel">
+      <h2>Requested Options</h2>
+      <div class="stack">
+        <div><strong>Dry run:</strong> {{ requested.dry_run|yesno:"yes,no" }}</div>
+        <div><strong>Verbose rsync output:</strong> {{ requested.verbose_output|yesno:"yes,no" }}</div>
+        <div><strong>Apply retention:</strong> {{ requested.prune|yesno:"yes,no" }}</div>
+        <div><strong>Retention max delete:</strong> {{ requested.prune_max_delete }}</div>
+        <div><strong>Protect bases:</strong> {{ requested.prune_protect_bases|yesno:"yes,no" }}</div>
+      </div>
+    </section>
+  {% endif %}
+
+  <section class="panel">
+    <h2>Rsync Command</h2>
+    {% if rsync_command %}
+      <pre>{% for part in rsync_command %}{{ part }}{% if not forloop.last %}
+{% endif %}{% endfor %}</pre>
+    {% else %}
+      <p class="muted">No rsync command recorded yet.</p>
+    {% endif %}
+  </section>
+
+  <section class="panel">
+    <h2>Rsync Log</h2>
+    <div class="stack spaced">
+      {% if rsync_log_exists %}
+        <div><a href="{% url 'run_rsync_log' run.id %}">Open full rsync log</a></div>
+        <div class="muted">{{ rsync_log_path }}</div>
+      {% elif rsync_log_path %}
+        <div class="muted">{{ rsync_log_path }} (missing)</div>
+      {% else %}
+        <div class="muted">No rsync log path recorded yet.</div>
+      {% endif %}
+    </div>
+    {% if rsync_log_tail %}
+      <pre>{% for line in rsync_log_tail %}{{ line }}{% if not forloop.last %}
+{% endif %}{% endfor %}</pre>
+    {% else %}
+      <p class="muted">No recent rsync log output recorded yet.</p>
+    {% endif %}
+  </section>
+
+  {% if stats %}
+    <section class="panel">
+      <h2>Stats</h2>
+      <div class="two-col">
+        <div class="stack">
+          <div><strong>Duration:</strong> {{ stats.duration_seconds|default:"" }}{% if stats.duration_seconds is not None %}s{% endif %}</div>
+          <div><strong>Files seen:</strong> {{ stats.rsync.files_total|default:"" }}</div>
+          <div><strong>Files transferred:</strong> {{ stats.rsync.files_transferred|default:"" }}</div>
+          <div><strong>Files created:</strong> {{ stats.rsync.files_created|default:"" }}</div>
+          <div><strong>Files deleted:</strong> {{ stats.rsync.files_deleted|default:"" }}</div>
+        </div>
+        <div class="stack">
+          <div><strong>Total file size:</strong> {{ stats.rsync.total_file_size_bytes|filesizeformat }}</div>
+          <div><strong>Transferred file size:</strong> {{ stats.rsync.total_transferred_file_size_bytes|filesizeformat }}</div>
+          <div><strong>Literal data:</strong> {{ stats.rsync.literal_data_bytes|filesizeformat }}</div>
+          <div><strong>Matched data:</strong> {{ stats.rsync.matched_data_bytes|filesizeformat }}</div>
+          <div><strong>Estimated link-dest saving:</strong> {{ stats.rsync.link_dest_estimated_savings_bytes|filesizeformat }}</div>
+        </div>
+      </div>
+    </section>
+  {% endif %}
+
+  {% if has_prune_result %}
+    <section class="panel highlight {% if prune_result.ok %}success{% else %}warning{% endif %}">
+      <h2>Retention</h2>
+      <div class="stack">
+        <div><strong>Status:</strong> {% if prune_result.ok %}ok{% else %}warning{% endif %}</div>
+        {% if prune_result.kind %}<div><strong>Kind:</strong> {{ prune_result.kind }}</div>{% endif %}
+        {% if prune_result.planned_delete_count is not None %}<div><strong>Planned deletions:</strong> {{ prune_result.planned_delete_count }}</div>{% endif %}
+        {% if prune_result.deleted %}<div><strong>Deleted:</strong> {{ prune_result.deleted|length }}</div>{% endif %}
+        {% if prune_result.max_delete is not None %}<div><strong>Max delete:</strong> {{ prune_result.max_delete }}</div>{% endif %}
+        {% if prune_result.protect_bases is not None %}<div><strong>Protect bases:</strong> {{ prune_result.protect_bases|yesno:"yes,no" }}</div>{% endif %}
+        {% if prune_result.incomplete_ignored_count %}<div><strong>Incomplete ignored:</strong> {{ prune_result.incomplete_ignored_count }}</div>{% endif %}
+        {% if prune_result.actions %}
+          <div><strong>Actions:</strong></div>
+          <ul>
+            {% for action in prune_result.actions %}
+              <li>{{ action }}</li>
+            {% endfor %}
+          </ul>
+        {% endif %}
+        {% if prune_result.error %}<div><strong>Error:</strong> {{ prune_result.error }}</div>{% endif %}
+        {% if prune_result.type %}<div><strong>Type:</strong> {{ prune_result.type }}</div>{% endif %}
+      </div>
+    </section>
+  {% endif %}
+
+  {% if retention_warning.has_warning %}
+    <section class="panel highlight warning">
+      <h2>Retention Warnings</h2>
+      <div class="stack">
+        {% if retention_warning.prune_exceeded %}
+          <div>
+            Scheduled pruning for this host would delete {{ retention_warning.delete_count }} snapshot(s), above max
+            delete {{ retention_warning.max_delete }}.
+          </div>
+        {% endif %}
+        {% if retention_warning.incomplete_count %}
+          <div>
+            {{ retention_warning.incomplete_count }} incomplete snapshot(s) exist for this host and are excluded from
+            retention cleanup.
+          </div>
+        {% endif %}
+        {% if retention_warning.error %}
+          <div>{{ retention_warning.error }}</div>
+        {% endif %}
+      </div>
+    </section>
+  {% endif %}
+
+  <section class="panel">
+    <h2>Raw Result</h2>
+    <pre>{{ result_json }}</pre>
+  </section>
+{% endblock %}

src/pobsync_backend/templates/pobsync_backend/schedule_form.html

@@ -0,0 +1,33 @@
+{% extends "pobsync_backend/base.html" %}
+
+{% block title %}Schedule | {{ host.host }}{% endblock %}
+
+{% block content %}
+  <h1>Schedule: {{ host.host }}</h1>
+
+  <section class="actions" aria-label="Schedule actions">
+    <a class="button-link" href="{% url 'host_detail' host.host %}">Back to host</a>
+  </section>
+
+  <section class="panel">
+    <h2>{% if schedule %}Edit Schedule{% else %}Create Schedule{% endif %}</h2>
+    <p class="muted">Schedules use cron-style timing syntax, but they are evaluated by the pobsync scheduler service.</p>
+    <form method="post" class="form-grid">
+      {% csrf_token %}
+      {{ form.non_field_errors }}
+
+      {% for field in form %}
+        <div class="field">
+          {{ field.errors }}
+          <label for="{{ field.id_for_label }}">{{ field.label }}</label>
+          {{ field }}
+          {% if field.help_text %}<div class="helptext">{{ field.help_text }}</div>{% endif %}
+        </div>
+      {% endfor %}
+
+      <div class="actions">
+        <button type="submit">Save schedule</button>
+      </div>
+    </form>
+  </section>
+{% endblock %}

src/pobsync_backend/templates/pobsync_backend/self_check.html

@@ -0,0 +1,42 @@
+{% extends "pobsync_backend/base.html" %}
+
+{% block title %}Self Check | pobsync{% endblock %}
+
+{% block content %}
+  <h1>Self Check</h1>
+
+  <section class="actions" aria-label="Self check actions">
+    <a class="button-link secondary" href="{% url 'dashboard' %}">Back to dashboard</a>
+  </section>
+
+  <section class="grid" aria-label="Self check summary">
+    <div class="metric"><div class="label">OK</div><div class="value">{{ summary.ok }}</div></div>
+    <div class="metric"><div class="label">Warnings</div><div class="value">{{ summary.warning }}</div></div>
+    <div class="metric"><div class="label">Failed</div><div class="value">{{ summary.failed }}</div></div>
+    <div class="metric"><div class="label">Skipped</div><div class="value">{{ summary.skipped }}</div></div>
+  </section>
+
+  <section class="panel">
+    <h2>Checks</h2>
+    <table>
+      <thead>
+        <tr>
+          <th>Status</th>
+          <th>Check</th>
+          <th>Message</th>
+          <th>Detail</th>
+        </tr>
+      </thead>
+      <tbody>
+        {% for check in checks %}
+          <tr>
+            <td><span class="status {{ check.status }}">{{ check.status }}</span></td>
+            <td>{{ check.name }}</td>
+            <td>{{ check.message }}</td>
+            <td class="muted">{{ check.detail }}</td>
+          </tr>
+        {% endfor %}
+      </tbody>
+    </table>
+  </section>
+{% endblock %}

src/pobsync_backend/templates/pobsync_backend/snapshot_detail.html

@@ -0,0 +1,161 @@
+{% extends "pobsync_backend/base.html" %}
+
+{% block title %}Snapshot {{ snapshot.dirname }} | {{ snapshot.host.host }}{% endblock %}
+
+{% block content %}
+  <h1>{{ snapshot.dirname }}</h1>
+
+  <section class="actions" aria-label="Snapshot actions">
+    <a class="button-link" href="{% url 'host_detail' snapshot.host.host %}">Back to host</a>
+  </section>
+
+  <section class="grid" aria-label="Snapshot summary">
+    <div class="metric"><div class="label">Host</div><div class="value">{{ snapshot.host.host }}</div></div>
+    <div class="metric"><div class="label">Kind</div><div class="value">{{ snapshot.kind }}</div></div>
+    <div class="metric"><div class="label">Status</div><div class="value">{{ snapshot.status|default:"" }}</div></div>
+    <div class="metric"><div class="label">Runs</div><div class="value">{{ backup_runs|length }}</div></div>
+  </section>
+
+  <div class="two-col">
+    <section class="panel">
+      <h2>Snapshot</h2>
+      <div class="stack">
+        <div><strong>Path:</strong> {{ snapshot.path }}</div>
+        <div><strong>Started:</strong> {{ snapshot.started_at|default:"" }}</div>
+        <div><strong>Ended:</strong> {{ snapshot.ended_at|default:"" }}</div>
+        <div><strong>Discovered:</strong> {{ snapshot.discovered_at }}</div>
+      </div>
+    </section>
+
+    <section class="panel">
+      <h2>Base</h2>
+      <div class="stack">
+        <div><strong>Record:</strong> {% if snapshot.base %}<a href="{% url 'snapshot_detail' snapshot.base.id %}">{{ snapshot.base.dirname }}</a>{% endif %}</div>
+        <div><strong>Kind:</strong> {{ snapshot.base_kind }}</div>
+        <div><strong>Dirname:</strong> {{ snapshot.base_dirname }}</div>
+        <div><strong>Path:</strong> {{ snapshot.base_path }}</div>
+      </div>
+    </section>
+  </div>
+
+  {% if stats %}
+    <section class="panel">
+      <h2>Stats</h2>
+      <div class="two-col">
+        <div class="stack">
+          <div><strong>Duration:</strong> {{ stats.duration_seconds|default:"" }}{% if stats.duration_seconds is not None %}s{% endif %}</div>
+          <div><strong>Files seen:</strong> {{ stats.rsync.files_total|default:"" }}</div>
+          <div><strong>Files transferred:</strong> {{ stats.rsync.files_transferred|default:"" }}</div>
+          <div><strong>Total file size:</strong> {{ stats.rsync.total_file_size_bytes|filesizeformat }}</div>
+          <div><strong>Estimated link-dest saving:</strong> {{ stats.rsync.link_dest_estimated_savings_bytes|filesizeformat }}</div>
+        </div>
+        <div class="stack">
+          <div><strong>Snapshot apparent size:</strong> {{ stats.storage.snapshot.apparent_size_bytes|filesizeformat }}</div>
+          <div><strong>Snapshot allocated size:</strong> {{ stats.storage.snapshot.allocated_size_bytes|filesizeformat }}</div>
+          <div><strong>Hardlinked files:</strong> {{ stats.storage.snapshot.hardlinked_files|default:"" }}</div>
+          <div><strong>Backup root used:</strong> {{ stats.storage.capacity.used_percent|default:"" }}%</div>
+          <div><strong>Backup root available:</strong> {{ stats.storage.capacity.available_bytes|filesizeformat }}</div>
+        </div>
+      </div>
+    </section>
+  {% endif %}
+
+  <section class="panel">
+    <h2>Restore Guidance</h2>
+    <div class="stack spaced">
+      <div><strong>Snapshot data path:</strong> {{ restore.source_path }}</div>
+      <div><strong>Example staging destination:</strong> {{ restore.destination_path }}</div>
+      <div class="muted">
+        Restore from the snapshot's <code>data/</code> directory. Start with a dry run, restore to a staging path first,
+        and only then copy data back to a live host or service path.
+      </div>
+    </div>
+    <div class="stack spaced">
+      <div><strong>Inspect the snapshot:</strong></div>
+      <pre>{{ restore.inspect_command }}</pre>
+    </div>
+    <div class="stack spaced">
+      <div><strong>Dry-run restore to staging:</strong></div>
+      <pre>{{ restore.dry_run_command }}</pre>
+    </div>
+    <div class="stack spaced">
+      <div><strong>Restore to staging:</strong></div>
+      <pre>{{ restore.local_command }}</pre>
+    </div>
+    <div class="stack spaced">
+      <div><strong>Dry-run a directory restore:</strong></div>
+      <pre>{{ restore.partial_dry_run_command }}</pre>
+      <div class="muted">Replace <code>{{ restore.example_relative_path }}</code> with the path you want to restore.</div>
+    </div>
+    <div class="stack spaced">
+      <div><strong>Dry-run a single file restore:</strong></div>
+      <pre>{{ restore.file_dry_run_command }}</pre>
+      <div class="muted">Replace <code>{{ restore.example_file_relative_path }}</code> with the file you want to restore.</div>
+    </div>
+    <div class="stack spaced">
+      <div><strong>Dry-run restore back to the original host:</strong></div>
+      <pre>{{ restore.remote_dry_run_command }}</pre>
+    </div>
+    <p class="muted">
+      Snapshots can contain hardlinks to files shared with earlier snapshots. Treat snapshot directories as read-only:
+      copy data out with rsync instead of editing files in place.
+    </p>
+  </section>
+
+  <section class="panel">
+    <h2>Backup Runs</h2>
+    <table>
+      <thead>
+        <tr>
+          <th>Run</th>
+          <th>Status</th>
+          <th>Started</th>
+          <th>Ended</th>
+        </tr>
+      </thead>
+      <tbody>
+        {% for run in backup_runs %}
+          <tr>
+            <td><a href="{% url 'run_detail' run.id %}">Run {{ run.id }}</a></td>
+            <td><span class="status {{ run.status }}">{{ run.status }}</span></td>
+            <td>{{ run.started_at|default:"" }}</td>
+            <td>{{ run.ended_at|default:"" }}</td>
+          </tr>
+        {% empty %}
+          <tr><td colspan="4" class="muted">No backup runs linked to this snapshot.</td></tr>
+        {% endfor %}
+      </tbody>
+    </table>
+  </section>
+
+  <section class="panel">
+    <h2>Derived Snapshots</h2>
+    <table>
+      <thead>
+        <tr>
+          <th>Kind</th>
+          <th>Status</th>
+          <th>Started</th>
+          <th>Dirname</th>
+        </tr>
+      </thead>
+      <tbody>
+        {% for child in derived_snapshots %}
+          <tr>
+            <td>{{ child.kind }}</td>
+            <td>{{ child.status }}</td>
+            <td>{{ child.started_at|default:"" }}</td>
+            <td><a href="{% url 'snapshot_detail' child.id %}">{{ child.dirname }}</a></td>
+          </tr>
+        {% empty %}
+          <tr><td colspan="4" class="muted">No derived snapshots linked to this snapshot.</td></tr>
+        {% endfor %}
+      </tbody>
+    </table>
+  </section>
+
+  <section class="panel">
+    <h2>Metadata</h2>
+    <pre>{{ metadata_json }}</pre>
+  </section>
+{% endblock %}

src/pobsync_backend/templates/pobsync_backend/ssh_credential_form.html

@@ -0,0 +1,66 @@
+{% extends "pobsync_backend/base.html" %}
+
+{% block title %}{% if credential %}SSH Key | {{ credential.name }}{% else %}New SSH Key{% endif %} | pobsync{% endblock %}
+
+{% block content %}
+  <h1>{% if credential %}SSH Key: {{ credential.name }}{% else %}New SSH Key{% endif %}</h1>
+
+  <section class="actions" aria-label="SSH key form actions">
+    <a class="button-link" href="{% url 'ssh_credentials' %}">Back to SSH keys</a>
+  </section>
+
+  <section class="panel">
+    <h2>{% if credential %}Edit SSH Credential{% else %}Create SSH Credential{% endif %}</h2>
+    {% if credential and credential.public_key %}
+      <div class="field">
+        <label>Public key</label>
+        <pre><code>{{ credential.public_key }}</code></pre>
+      </div>
+    {% endif %}
+    {% if credential and credential.key_path %}
+      <p class="muted">Private key path: <code>{{ credential.key_path }}</code></p>
+    {% endif %}
+    {% if credential and credential.fingerprint %}
+      <p class="muted">Fingerprint: <code>{{ credential.fingerprint }}</code></p>
+    {% endif %}
+    <form method="post" enctype="multipart/form-data" class="form-grid">
+      {% csrf_token %}
+      {{ form.non_field_errors }}
+
+      {% for field in form %}
+        <div class="field">
+          {{ field.errors }}
+          <label for="{{ field.id_for_label }}">{{ field.label }}</label>
+          {{ field }}
+          {% if field.help_text %}<div class="helptext">{{ field.help_text }}</div>{% endif %}
+        </div>
+      {% endfor %}
+
+      <div class="actions">
+        <button type="submit">{% if credential %}Save SSH key{% else %}Create SSH key{% endif %}</button>
+      </div>
+    </form>
+  </section>
+
+  {% if credential %}
+    <section class="panel">
+      <h2>Delete SSH Key</h2>
+      {% if credential.hosts.exists or credential.global_configs.exists %}
+        <p class="muted">
+          This SSH key is still selected by {{ credential.hosts.count }} host(s) or
+          {{ credential.global_configs.count }} global config(s). Select another key there before deleting it.
+        </p>
+      {% else %}
+        <p class="muted">Type <strong>{{ credential.name }}</strong> to confirm deletion.</p>
+      {% endif %}
+      <form method="post" action="{% url 'delete_ssh_credential' credential.id %}">
+        {% csrf_token %}
+        <div class="field">
+          <label for="confirm_name">Confirm key name</label>
+          <input id="confirm_name" name="confirm_name" type="text" {% if credential.hosts.exists or credential.global_configs.exists %}disabled{% endif %}>
+        </div>
+        <button type="submit" class="danger" {% if credential.hosts.exists or credential.global_configs.exists %}disabled{% endif %}>Delete SSH key</button>
+      </form>
+    </section>
+  {% endif %}
+{% endblock %}

src/pobsync_backend/templates/pobsync_backend/ssh_credential_generate.html

@@ -0,0 +1,32 @@
+{% extends "pobsync_backend/base.html" %}
+
+{% block title %}Generate SSH Key | pobsync{% endblock %}
+
+{% block content %}
+  <h1>Generate SSH Key</h1>
+
+  <section class="actions" aria-label="SSH key form actions">
+    <a class="button-link" href="{% url 'ssh_credentials' %}">Back to SSH keys</a>
+  </section>
+
+  <section class="panel">
+    <h2>Create Key Pair</h2>
+    <form method="post" class="form-grid">
+      {% csrf_token %}
+      {{ form.non_field_errors }}
+
+      {% for field in form %}
+        <div class="field">
+          {{ field.errors }}
+          <label for="{{ field.id_for_label }}">{{ field.label }}</label>
+          {{ field }}
+          {% if field.help_text %}<div class="helptext">{{ field.help_text }}</div>{% endif %}
+        </div>
+      {% endfor %}
+
+      <div class="actions">
+        <button type="submit">Generate SSH key</button>
+      </div>
+    </form>
+  </section>
+{% endblock %}