feat(subsonic): add support for track/album/artist ratings/stars

fixes #171
fixes #31

* Initial code. Compiles and passes unit tests.

* Moved average rating calculation from rating fetch to set rating function. Still only compiled and unit tested.

* Bug fixes

* Fixed bug in savePlayQueue. Removed unique_index for star / rating entries because it's not valid.

* Changed time format on stars to RFC3339Nano to match created date format.

* Lint fixes.

* More lint fixes.

* Removed add* functions and replaced with Preload.

* Fixed several bugs in handlers for getStarred and getStarred2.

* Fixed bug when using music folder ID.

Co-authored-by: Brian Doherty <brian@hplaptop.dohertyfamily.me>

db/migrations.go

@@ -44,6 +44,7 @@ func (db *DB) Migrate(ctx MigrationContext) error {
 		construct(ctx, "202204270903", migratePodcastDropUserID),
 		construct(ctx, "202206011628", migrateInternetRadioStations),
 		construct(ctx, "202206101425", migrateUser),
+		construct(ctx, "202207251148", migrateStarRating),
 	}
 
 	return gormigrate.
@@ -371,3 +372,18 @@ func migrateUser(tx *gorm.DB, _ MigrationContext) error {
 	).
 		Error
 }
+
+func migrateStarRating(tx *gorm.DB, _ MigrationContext) error {
+	return tx.AutoMigrate(
+		Album{},
+		AlbumStar{},
+		AlbumRating{},
+		Artist{},
+		ArtistStar{},
+		ArtistRating{},
+		Track{},
+		TrackStar{},
+		TrackRating{},
+	).
+		Error
+}