Migration 10:
- play_history table (audio_file_id FK, played_at DATETIME, CASCADE delete)
- play_count + last_played columns on audio_files (denormalized)
- Recreated track_metadata VIEW with play_count and last_played columns
Play recording:
- queue.recordPlay() inserts play_history row + updates denormalized columns
- Called from OnPlaybackFinished after queue advance completes
- Mutex released before DB write to avoid MaxOpenConns(1) deadlock
- Natural finish only — skip/stop does not count
Tests:
- TestMigration10PlayHistory: schema, columns, VIEW, round-trip verification
- All 49 smart playlist + 15 service + existing DB tests still pass
- Next() rolls back currentIndex and skips emitIndexChanged on load failure
- Previous() applies same pattern to all three branches (RepeatOne, restart, navigate)
- OnPlaybackFinished() rolls back currentIndex on playCurrentTrack failure
- PlayIndex() and playFromStart() also guard against load failures
- RepeatOne paths guard emitIndexChanged with the bool return value
yonlu