/**
  * @param Backlog[] $backlogs
  * @return LastIdQuery[]
  */
 private function getBacklogQueries($backlogs)
 {
     $queries = [];
     foreach ($backlogs as $backlog) {
         $payload = $backlog->getPayload();
         switch ($backlog->getEvent()) {
             case ORMBacklogSubscriber::EVENT_SUPPLIER_DELETED:
             case ORMBacklogSubscriber::EVENT_SUPPLIER_INSERTED:
             case ORMBacklogSubscriber::EVENT_SUPPLIER_UPDATED:
                 $queries[] = $this->queryFactory->createManufacturerQuery([$payload['id']], self::LIMIT);
                 break;
             case ORMBacklogSubscriber::EVENT_TAX_DELETED:
             case ORMBacklogSubscriber::EVENT_TAX_INSERTED:
             case ORMBacklogSubscriber::EVENT_TAX_UPDATED:
                 $queries[] = $this->queryFactory->createTaxQuery([$payload['id']], self::LIMIT);
                 break;
             case ORMBacklogSubscriber::EVENT_UNIT_DELETED:
             case ORMBacklogSubscriber::EVENT_UNIT_INSERTED:
             case ORMBacklogSubscriber::EVENT_UNIT_UPDATED:
                 $queries[] = $this->queryFactory->createUnitIdQuery([$payload['id']], self::LIMIT);
                 break;
             case ORMBacklogSubscriber::EVENT_PROPERTY_GROUP_DELETED:
             case ORMBacklogSubscriber::EVENT_PROPERTY_GROUP_INSERTED:
             case ORMBacklogSubscriber::EVENT_PROPERTY_GROUP_UPDATED:
                 $queries[] = $this->queryFactory->createPropertyGroupQuery([$payload['id']], self::LIMIT);
                 break;
             case ORMBacklogSubscriber::EVENT_PROPERTY_OPTION_DELETED:
             case ORMBacklogSubscriber::EVENT_PROPERTY_OPTION_INSERTED:
             case ORMBacklogSubscriber::EVENT_PROPERTY_OPTION_UPDATED:
                 $queries[] = $this->queryFactory->createPropertyOptionQuery([$payload['id']], self::LIMIT);
                 break;
         }
     }
     return $queries;
 }