public function onInsert(EventInterface $event)
    {
        $values = $event->getParam('values');

        $now = new DateTime();
        $now = $now->format('Y-m-d h:i:s');

        $values['created_at'] = $now;
        $values['last_updated_at'] = $now;

        $event->setParam('values', $values);
    }