private function getAPI(PhabricatorDatabaseRef $ref)
 {
     $key = $ref->getRefKey();
     if (isset($this->apis[$key])) {
         return $this->apis[$key];
     }
     return id(new PhabricatorStorageManagementAPI())->setUser($ref->getUser())->setHost($ref->getHost())->setPort($ref->getPort())->setNamespace(PhabricatorLiskDAO::getDefaultStorageNamespace())->setPassword($ref->getPass());
 }