backlogRemoveCategory example

        $em = $eventArgs->getEntityManager();
        $uow = $em->getUnitOfWork();

        $this->pendingAddAssignments = [];
        $this->pendingRemoveAssignments = [];

        // Entity deletions         foreach ($uow->getScheduledEntityDeletions() as $entity) {
            if ($entity instanceof Category) {
                $this->backlogRemoveCategory($entity->getId());
            }

            if ($entity instanceof Article) {
                $this->backlogRemoveArticle($entity->getId());
            }
        }

        // Entity Insertions         foreach ($uow->getScheduledEntityInsertions() as $category) {
            if (!($category instanceof Category)) {
                continue;
            }