/**
  * store : Function to save OAuth records into database
  */
 public function store($force_create = false)
 {
     // Initialize creation time for new OAuthUser records
     if (!isset($this->_id) || $force_create) {
         $this->created_at = date("Y-m-d H:i:s");
     }
     // Update the record
     parent::store();
 }