Implements the stubbed /sync endpoints:
- GET /sync/changes — delta pull (likes, plays, changed playlists with
their track ids, changed catalogue tracks) over the half-open window
(since, cursor]; the cursor is the DB clock, so it's immune to app/DB
skew.
- POST /sync/push — idempotent append of client like/play events
(ON CONFLICT DO NOTHING by client-supplied id); events for tracks the
server doesn't have are skipped (graceful degradation).
Adds a server-ingestion column `synced_at` to the likes + play_history
event logs (migration) as the delta ordering key, so an event pushed
with an older event time still surfaces for other devices. Repos gain
list_since/add_event (likes, history), list_changed_since (playlists,
tracks) and playlist.track_ids; wired via SyncService in deps.
Also fixes test isolation exposed by the registry-backed /admin/sources
endpoint: test_sources_api clears the process-cached source registry,
and test_admin_api no longer hardcodes the environment name.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Цвылев Александр Вадимович
048854f92a