_get_source() hardcoded 'itunes' as fallback, so seasonal content was
stored with source='itunes' but API endpoints queried source='deezer' —
resulting in empty discover page seasons. Now reads the configured
fallback source from metadata_service.
Users can now choose between iTunes/Apple Music and Deezer as their free
metadata source in Settings. Spotify always takes priority when authenticated;
the fallback handles all lookups when it's not.
Core changes:
- DeezerClient: full metadata interface (search, albums, artists, tracks)
matching iTunesClient's API surface with identical dataclass return types
- SpotifyClient: configurable _fallback property switches between iTunes/Deezer
based on live config reads (no restart needed)
- MetadataService, web_server, watchlist_scanner, api/search, repair_worker,
seasonal_discovery, personalized_playlists: all direct iTunesClient imports
replaced with fallback-aware helpers
Database:
- deezer_artist_id on watchlist_artists and similar_artists tables
- deezer_track_id/album_id/artist_id on discovery_pool and discovery_cache
- Full CRUD for Deezer IDs: add, read, update, backfill, metadata enrichment
- Watchlist duplicate detection by artist name prevents re-adding across sources
- SimilarArtist dataclass and all query/insert methods handle Deezer columns
Bug fixes found during review:
- Similar artist backfill was writing Deezer IDs into iTunes columns
- Discover hero was storing resolved Deezer IDs in wrong column
- Status cache not invalidating on settings save (source name lag)
- Watchlist add allowing duplicates when switching metadata sources
Southern hemisphere users now see correct seasons (e.g. March = Autumn,
December = Summer). Holidays (Halloween, Christmas, Valentine's) stay
calendar-fixed regardless of hemisphere.
- Hemisphere dropdown in Discovery Pool Settings
- GET/POST /api/discovery/hemisphere endpoints
- Season detection offsets months by 6 for southern hemisphere
- Stored in metadata table, defaults to northern
