/**
  * clean history after delete
  * @param $self
  * @param $user
  * @param $reason
  * @param $id
  * @return bool
  */
 public static function onArticleDeleteComplete(&$self, &$user, $reason, $id)
 {
     $title = $self->getTitle();
     $app = F::app();
     if ($title instanceof Title && $title->getNamespace() == NS_USER_WALL_MESSAGE) {
         $wh = new WallHistory($app->wg->CityId);
         $wh->remove($id);
     }
     return true;
 }