public function down(Schema $schema)
{
$app = \Eccube\Application::getInstance();
$em = $app["orm.em"];
$DeliveryDate = $app['eccube.repository.delivery_date']->find(9);
if ($DeliveryDate->getValue() === -1) {
$DeliveryDate->setValue(0);
$em->flush($DeliveryDate);
}
}