Update only fields with changes

lib/Db/CardMapper.php

@@ -44,16 +44,11 @@ class CardMapper extends DeckMapper implements IPermissionMapper {
         return parent::insert($entity);
     }
 
-    /**
-     * @param Entity $entity
-     * @return Entity
-     */
     public function update(Entity $entity) {
         $entity->setLastModified(time());
         return parent::update($entity);
     }
 
-
 	/**
 	 * @param $id
 	 * @return Entity if not found