public function execute()
 {
     $historyModel = new contactsHistoryModel();
     if ($fix = (int) waRequest::get('fix')) {
         $position = (int) waRequest::get('position');
         $historyModel->fix($fix, $position);
         $this->response['fixed'] = $fix;
     }
     if ($unfix = (int) waRequest::get('unfix')) {
         $historyModel->fix($unfix, 0);
         $this->response['unfixed'] = $unfix;
     }
     if (waRequest::get('clear')) {
         $type = waRequest::get('ctype');
         $historyModel->prune(0, $type);
         $this->response['cleared'] = 1;
     }
 }