Implement save method in playerservice to update existing player entities

backend/utils.go

@@ -96,6 +96,10 @@ func PersistNoteData(note NoteData) (Note, []Association, error) {
 	}
 	res.Player = player
 	player.Guild = guild
+	player, err = ps.Save(player)
+	if err != nil {
+		return res, ass, fmt.Errorf("failed saving player: %v", err)
+	}
 
 	for _, assoc := range note.Associations {
 		assocPlayer, err := ps.GetOrCreate(assoc.Player, Guild{})