public function down(Schema $schema)
{
$this->dropIndex($schema, 'dtb_product_class', 'dtb_product_class_price02_idx');
$this->dropIndex($schema, 'dtb_product_class', 'dtb_product_class_stock_stock_unlimited_idx');
$this->dropIndex($schema, 'dtb_customer', 'dtb_customer_email_idx');
$this->dropIndex($schema, 'dtb_customer', 'dtb_customer_create_date_idx');
$this->dropIndex($schema, 'dtb_customer', 'dtb_customer_update_date_idx');
$this->dropIndex($schema, 'dtb_customer', 'dtb_customer_last_buy_date_idx');
$this->dropIndex($schema, 'dtb_customer', 'dtb_customer_buy_times_idx');
$this->dropIndex($schema, 'dtb_customer', 'dtb_customer_buy_total_idx');
$this->dropIndex($schema, 'dtb_order', 'dtb_order_pre_order_id_idx');
$this->dropIndex($schema, 'dtb_order', 'dtb_order_pre_order_email_idx');
$this->dropIndex($schema, 'dtb_order', 'dtb_order_pre_order_date_idx');
$this->dropIndex($schema, 'dtb_order', 'dtb_order_pre_payment_date_idx');
$this->dropIndex($schema, 'dtb_order', 'dtb_order_pre_commit_date_idx');
$this->dropIndex($schema, 'dtb_order', 'dtb_order_pre_update_date_idx');
$this->dropIndex($schema, 'dtb_page_layout', 'dtb_page_layout_url_idx');
}