public function handle_model_change($model)
 {
     $tainting_classes = array(Model\Episode::name(), Model\Feed::name(), Model\Podcast::name(), Model\Template::name(), Model\TemplateAssignment::name());
     $tainting_classes = apply_filters('podlove_cache_tainting_classes', $tainting_classes);
     if (in_array($model::name(), $tainting_classes)) {
         $this->taint();
     }
 }