Track snapshot base lineage in Django

README.md

@@ -138,6 +138,8 @@ SQLite remains the default because it is enough for a single backup server and k
 ## Current Architecture
 
 The public command surface is Django-first. The old YAML/cron CLI 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 remaining internal engine code still contains reusable backup primitives:
 
@@ -148,7 +150,6 @@ The remaining internal engine code still contains reusable backup primitives:
 
 Next refactor targets:
 
-- Record discovered snapshots into `SnapshotRecord`.
 - Surface `SnapshotRecord` data through API/admin views instead of filesystem inspection.
 - Move more snapshot lifecycle details into typed domain objects.
 - Replace remaining dictionary-shaped config at engine boundaries.