Add bulk import optimization: track_lookup cache, batch inserts, BulkSubmitter

db/queries/track_lookup.sql

@@ -0,0 +1,21 @@
+-- name: GetTrackLookup :one
+SELECT artist_id, album_id, track_id
+FROM track_lookup
+WHERE lookup_key = $1;
+
+-- name: InsertTrackLookup :exec
+INSERT INTO track_lookup (lookup_key, artist_id, album_id, track_id)
+VALUES ($1, $2, $3, $4)
+ON CONFLICT (lookup_key) DO UPDATE SET
+    artist_id = EXCLUDED.artist_id,
+    album_id = EXCLUDED.album_id,
+    track_id = EXCLUDED.track_id;
+
+-- name: DeleteTrackLookupByArtist :exec
+DELETE FROM track_lookup WHERE artist_id = $1;
+
+-- name: DeleteTrackLookupByAlbum :exec
+DELETE FROM track_lookup WHERE album_id = $1;
+
+-- name: DeleteTrackLookupByTrack :exec
+DELETE FROM track_lookup WHERE track_id = $1;