Closes the Library-tabs-start-empty gap. Mirrors
`flutter_client/lib/cache/sync_controller.dart`, scoped to artist /
album / track only (likes refresh via /api/likes/ids; playlists pull
on screen visit). The full multi-entity sync is overkill for v1
native.
New:
- models/wire/SyncResponseWire.kt — SyncArtistWire +
SyncAlbumWire + SyncTrackWire (raw DB-row shape returned by
/api/library/sync; distinct from the regular API's display
shapes which include derived album_count / cover_url etc.).
Plus SyncUpsertsWire / SyncDeletesWire / SyncResponseWire
envelopes.
- api/endpoints/SyncApi.kt — Retrofit GET /api/library/sync.
Returns Response<...> so the controller can branch on 200 /
204 (no changes since cursor) / 410 (cursor too old, wipe +
retry) without HttpException catches.
- cache/sync/SyncController.kt — @Singleton. Self-starting: on
construction subscribes to AuthStore.sessionCookie and fires
syncSafe() whenever it transitions to a non-null value (fresh
sign-in OR cold start with persisted cookie). Applies upserts
via the existing upsertAll DAO methods, applies deletes via
deleteByIds. Cursor + lastSyncAt persisted in sync_metadata so
the next sync resumes from the new watermark.
On 410 (server compaction window exceeded), resets the cursor
to 0 and recurses; the next response carries the full entity
set, which upsertAll overwrites with. Stale rows for entities
the server no longer knows about linger until a later 410 or
app-data-clear — acceptable for v1.
Modified:
- MinstrelApplication.kt — adds @Inject lateinit var
syncController (same construct-the-singleton trick used for
ResumeController). Without the @Inject the Hilt graph would
never instantiate the controller and its init {} cookie
observer wouldn't subscribe.
Likes / playlists / playlist_tracks deltas from the same endpoint
are deferred. Their dedicated refresh paths already populate the
local cache; folding them into the sync flow is an opportunistic
optimization, not an MVP gap.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
bvandeusen
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