protected function checkPageDeletedTrigger()
 {
     if (!$this->db->triggerExists('page', 'page_deleted')) {
         $this->applyPatch('patch-page_deleted.sql', false, "Adding function and trigger 'page_deleted' to table 'page'");
     } else {
         $this->output("...table 'page' has 'page_deleted' trigger\n");
     }
 }