Koito/internal/importer
safierinx-a 8ce6ec494d Add bulk import optimization: track_lookup cache, batch inserts, BulkSubmitter
Adopts ListenBrainz-inspired patterns to speed up imports from ~24h to
under 30 minutes for 49k scrobbles.

Phase 1 - track_lookup cache table:
- New migration (000006) adds persistent entity lookup cache
- Maps normalized (artist, track, album) → (artist_id, album_id, track_id)
- SubmitListen fast path: cache hit skips 18 DB queries → 2 queries
- Cache populated after entity resolution, invalidated on merge/delete
- Benefits both live scrobbles and imports

Phase 2 - SaveListensBatch:
- New batch listen insert using pgx CopyFrom → temp table → INSERT ON CONFLICT
- Thousands of inserts per second vs one-at-a-time

Phase 3 - BulkSubmitter:
- Reusable import accelerator for all importers
- Pre-deduplicates scrobbles by (artist, track, album) in memory
- Worker pool (4 goroutines) for parallel entity creation on cache miss
- Batch listen insertion via SaveListensBatch

Phase 4 - Migrate importers:
- Maloja, Spotify, LastFM, ListenBrainz importers use BulkSubmitter
- Koito importer left as-is (already fast with pre-resolved IDs)

Phase 5 - Skip image lookups during import:
- GetArtistImage/GetAlbumImage calls fully skipped when SkipCacheImage=true
- Background tasks (FetchMissingArtistImages/FetchMissingAlbumImages) backfill

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
2026-03-25 04:17:50 +05:30
..
bulk.go Add bulk import optimization: track_lookup cache, batch inserts, BulkSubmitter 2026-03-25 04:17:50 +05:30
importer.go feat: time-gated imports via cfg 2025-06-13 05:36:41 -04:00
koito.go fix: ui fixes and koito import time config fix (#128) 2026-01-12 17:44:33 -05:00
lastfm.go Add bulk import optimization: track_lookup cache, batch inserts, BulkSubmitter 2026-03-25 04:17:50 +05:30
listenbrainz.go Add bulk import optimization: track_lookup cache, batch inserts, BulkSubmitter 2026-03-25 04:17:50 +05:30
maloja.go Add bulk import optimization: track_lookup cache, batch inserts, BulkSubmitter 2026-03-25 04:17:50 +05:30
spotify.go Add bulk import optimization: track_lookup cache, batch inserts, BulkSubmitter 2026-03-25 04:17:50 +05:30