Add a new index for album, to optimize the `getAlbumList?type=alphabeticalByArtist` Subsonic query

db/migration/20211102215414_add_alphabetical_by_artist_index.go

@@ -0,0 +1,23 @@
+package migrations
+
+import (
+	"database/sql"
+
+	"github.com/pressly/goose"
+)
+
+func init() {
+	goose.AddMigration(upAddAlphabeticalByArtistIndex, downAddAlphabeticalByArtistIndex)
+}
+
+func upAddAlphabeticalByArtistIndex(tx *sql.Tx) error {
+	_, err := tx.Exec(`
+create index album_alphabetical_by_artist 
+    ON album(compilation, order_album_artist_name, order_album_name)
+`)
+	return err
+}
+
+func downAddAlphabeticalByArtistIndex(tx *sql.Tx) error {
+	return nil
+}