feat: look up prepared tracks in bulk and create a playlist with its songs at once

db/queries/playlists.sql

@@ -50,6 +50,10 @@ SELECT count(*) FROM playlist_items WHERE playlist_id = @playlist_id;
 INSERT INTO playlist_items (playlist_id, source, track_id, title, artist, album, cover_url, cover_key, duration_ms, page_url, position)
 VALUES (@playlist_id, @source, @track_id, @title, @artist, @album, @cover_url, @cover_key, @duration_ms, @page_url, @position);
 
+-- name: InsertPlaylistItems :copyfrom
+INSERT INTO playlist_items (playlist_id, source, track_id, title, artist, album, cover_url, cover_key, duration_ms, page_url, position)
+VALUES (@playlist_id, @source, @track_id, @title, @artist, @album, @cover_url, @cover_key, @duration_ms, @page_url, @position);
+
 -- name: SetPlaylistSeq :exec
 UPDATE playlists SET item_seq = @item_seq, updated_at = now() WHERE id = @id;
 

db/queries/tracks.sql

@@ -12,3 +12,9 @@ ON CONFLICT (source, track_id) DO UPDATE SET
     lyric = excluded.lyric, lyric_words = excluded.lyric_words, lyric_trans = excluded.lyric_trans,
     media_key = excluded.media_key, media_size = excluded.media_size,
     prepared_at = now();
+
+-- name: TrackMetas :many
+SELECT t.source, t.track_id, t.title, t.artist, t.album, t.cover_url, t.cover_key, t.page_url, t.duration_ms
+FROM unnest(@sources::text[]) WITH ORDINALITY AS s(source, ord)
+JOIN unnest(@track_ids::text[]) WITH ORDINALITY AS k(track_id, ord) USING (ord)
+JOIN tracks t ON t.source = s.source AND t.track_id = k.track_id;