Solving my mass-inserting problem using a "direct" connection to the DB

PackageStorage.php

<?php
namespace TYPO3\Docs\Build\Storage;

/*                                                                        *
 * This script belongs to the FLOW3 package "TYPO3.Docs.Build".                 *
 *                                                                        *
 *                                                                        *
 */

use TYPO3\FLOW3\Annotations as FLOW3;

/**
 * Class dealing with Package Storage
 *
 * @FLOW3\Scope("singleton")
 */
class PackageStorage {

	/**
	 * @FLOW3\Inject
	 * @var \Doctrine\Common\Persistence\ObjectManager
	 */
	protected $entityManager;

	/**
	 * @FLOW3\Inject
	 * @var \TYPO3\FLOW3\Persistence\Doctrine\Mapping\Driver\Flow3AnnotationDriver
	 */
	protected $flow3AnnotationDriver;

	/**
	 * @var \Doctrine\DBAL\Connection
	 */
	protected $connection;

	/**
	 * @var string
	 */
	protected $tableName;

	/**
	 * Further object initialization
	 *
	 * @return void
	 */
	public function initializeObject() {
		/** @var $entityManager \Doctrine\ORM\EntityManager */
		$entityManager = $this->entityManager;
		$this->connection = $entityManager->getConnection();

		$this->tableName = $this->flow3AnnotationDriver->inferTableNameFromClassName('TYPO3\Docs\Build\Domain\Model\Package');
	}

	/**
	 * Persist data
	 *
	 * @param array $data
	 * @return boolean
	 */
	public function persist($data) {
		$data['flow3_persistence_identifier'] = \TYPO3\FLOW3\Utility\Algorithms::generateUUID();
		$this->connection->insert($this->tableName, (array) $data);;
	}

	/**
	 * Delete records given a repository type
	 *
	 * @param string $repositoryType
	 */
	public function deleteByRepositoryType($repositoryType) {
		$data['repositoryType'] = $repositoryType;
		$this->connection->delete($this->tableName, (array) $data);;
	}
}

?>