private function createIteration()
{
$table = $this->createTable('iteration');
$table->addColumn('variant_id', 'integer');
$table->addColumn('time', 'integer');
$table->addColumn('memory', 'integer');
$table->addColumn('reject_count', 'integer');
$table->addForeignKeyConstraint($this->variantTable, ['variant_id'], ['id'], ['onDelete' => 'CASCADE']);
}