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Broque Thomas 6fe85f2f37 Server playlist sync: append mode (preserve user-added tracks) ... Discord report (CJFC, 2026-04-26): syncing a Spotify playlist to the server overwrote anything manually added to the server-side playlist. The fix adds a per-sync mode picker next to the Sync button on the playlist details modal — Replace (default, current delete-recreate behavior) or Append only (preserves existing tracks, only adds new ones). Useful when the source platform caps playlist size and the user is manually building beyond it on the server. Implementation: * New `append_to_playlist(name, tracks)` method on Plex / Jellyfin / Navidrome clients. Each uses the server's NATIVE append API: - Plex: `existing_playlist.addItems(new_tracks)` - Jellyfin: `POST /Playlists/<id>/Items?Ids=...&UserId=...` - Navidrome: Subsonic `updatePlaylist?songIdToAdd=...` Falls back to `create_playlist` when the playlist doesn't exist yet (first sync). No delete-recreate, no backup playlist created (preserves playlist creation date + metadata + non-soulsync-managed tracks). * Dedup-by-server-native-id (ratingKey for Plex, GUID for Jellyfin, song-id for Navidrome) — never re-adds a track already on the playlist. Server-native identity, not fuzzy title+artist match, so it can't false-collide. * `sync_service.sync_playlist` accepts `sync_mode='replace'|'append'` kwarg. Single if/else branch dispatches to `append_to_playlist` or `update_playlist`. Threaded through `core/discovery/sync.run_sync_task` and the `/api/sync/start` HTTP handler. Validation on the API rejects unknown mode strings (defaults to 'replace'). * Frontend: per-playlist `<select id="sync-mode-${id}">` rendered next to the Sync button in both modal renderers (sync-spotify.js for Spotify playlists, sync-services.js for Deezer ARL playlists). `startPlaylistSync` reads the select at click time; missing select (other callers like discover.js) defaults to 'replace' so backward compat preserved without per-call-site updates. * SoulSync standalone has no playlist methods at all and the modal hides the Sync button entirely on it via `_isSoulsyncStandalone` — dispatch never reaches that path, no defensive fallback needed. 15 new tests pin per-server append behavior: - missing playlist → create_playlist delegation - dedup filtering (existing IDs skipped, only new tracks added) - empty new-track set short-circuits without API call - failure paths return False without raising - contract listing (KNOWN_PER_SERVER_METHODS includes 'append_to_playlist'; Plex / Jellyfin / Navidrome all implement) Plus tests/discovery/test_discovery_sync.py fake `sync_playlist` fixture got `sync_mode='replace'` default to match the new signature (was breaking after the kwarg add; now passing). WHATS_NEW entry under new '2.6.0' block (hidden by `_getLatestWhatsNewVersion` until next release bump). Closes CJFC discord request.		2 weeks ago
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sync_service.py	Server playlist sync: append mode (preserve user-added tracks)	2 weeks ago