private function getValidOwnerIds()
    {
        $userRepo = $this->repository->getEntityManager()->getRepository(Entity\Users::class);
        $query = $userRepo->createQueryBuilder()
            ->select('id')
            ->where('enabled = :enabled')
            ->setParameter('enabled', true)
        ;
        $userRecords = $query->execute()->fetchAll(\PDO::FETCH_COLUMN);

        return $userRecords;
    }