private function gcUsers($days)
{
$query = $this->em->createQueryBuilder()->delete('Newscoop\\Entity\\User', 'u')->where('u.created < :ttl')->andWhere('u.status = :status')->getQuery();
$query->setParameter('ttl', new \DateTime('-' . $days . ' days'));
$query->setParameter('status', User::STATUS_INACTIVE);
$query->execute();
}