## Summary

- Fall back to filesystem measurement when snapshot storage metadata is missing.
- Prefer `data/` inside snapshot directories so incomplete snapshot metadata/log files are not counted as backup data.
- Add stats and dashboard rendering coverage for incomplete snapshots without recorded storage metadata.

## Tests
- .venv/bin/python manage.py test src.pobsync_backend.tests.test_stats_summary src.pobsync_backend.tests.test_views.ViewTests.test_dashboard_host_cards_measure_incomplete_data_without_snapshot_metadata --verbosity 2
- .venv/bin/python manage.py check
- git diff --check
- .venv/bin/python manage.py test src.pobsync_backend --verbosity 2

Closes #62

src/pobsync_backend/tests/test_views.py

@@ -8,9 +8,11 @@ from unittest.mock import patch
 
 from django.contrib.auth import get_user_model
 from django.core.files.uploadedfile import SimpleUploadedFile
+from django.template.defaultfilters import filesizeformat
 from django.test import TestCase, override_settings
 from django.urls import reverse
 
+from pobsync.run_stats import tree_usage
 from pobsync.util import write_yaml_atomic
 from pobsync_backend.models import (
     BackupRun,
@@ -248,6 +250,30 @@ class ViewTests(TestCase):
         self.assertContains(response, "300 bytes", html=True)
         self.assertContains(response, "600 bytes", html=True)
 
+    def test_dashboard_host_cards_measure_incomplete_data_without_snapshot_metadata(self) -> None:
+        self.client.force_login(self.staff_user)
+        host = HostConfig.objects.create(host="web-01", address="web-01.example.test")
+        with TemporaryDirectory() as tmp:
+            incomplete_dir = Path(tmp) / host.host / ".incomplete" / "20260519-041500Z__BROKEN1"
+            data_dir = incomplete_dir / "data"
+            data_dir.mkdir(parents=True)
+            data_dir.joinpath("partial-file").write_text("interrupted backup data\n", encoding="utf-8")
+            expected_usage = tree_usage(data_dir)
+            SnapshotRecord.objects.create(
+                host=host,
+                kind=SnapshotRecord.Kind.INCOMPLETE,
+                dirname=incomplete_dir.name,
+                path=str(incomplete_dir),
+                status="failed",
+                metadata={},
+            )
+
+            response = self.client.get(reverse("dashboard_hosts_live"))
+
+        self.assertEqual(response.status_code, 200)
+        self.assertContains(response, "Incomplete data")
+        self.assertContains(response, filesizeformat(expected_usage["allocated_size_bytes"]))
+
     def test_hosts_list_renders_host_cards_and_controls(self) -> None:
         self.client.force_login(self.staff_user)
         web = HostConfig.objects.create(host="web-01", address="web-01.example.test")