getLibraryRoot() returned "" after DirectoryPath was removed from
config.toml during multi-library migration. M3U8 relative paths could
not be resolved to absolute paths, causing every playlist track to
appear as phantom. Now falls back to the first library path from the
database when the legacy config field is empty.
- Create _libraries.sql with libraries table (name, path, created_at)
- Add library_id FK column and index to audio_files.sql
- Update playlist_tracks.sql with nullable audio_file_id, SET NULL FK, and 6 phantom columns
- Add af.library_id to track_metadata VIEW
- Regenerate sqlc code for updated schemas
- Fix playlist.go to use sql.NullInt64 for nullable audio_file_id
- Add CreatedAt and UpdatedAt string fields to Summary struct
- Format as RFC3339 at all construction sites in playlist.go and favorites.go
- Update TypeScript bindings with new fields in models.ts
- Add uniquePlaylistName method to auto-rename duplicate names with (1), (2), etc.
- Call uniquePlaylistName only from ImportPlaylist, not CreatePlaylist
- Update PlaylistFilePicker to return []string via OpenMultipleFilesDialog
- Add ImportPlaylists method for sequential batch import with partial success
- Queue.SetContext acquires existing q.mu before writing q.ctx
- Library struct gets new mu sync.Mutex; SetContext and SetRescanHooks acquire it
- Playlist Service struct gets new mu sync.Mutex; SetContext and SetFavoritesConfig acquire it
- Library and Playlist release lock before calling post-init methods (registerEventHandlers, migrateExistingPlaylists)