Add virtual_combinations migration to 9.2.0 upgrade SQL

Companion to PrestaShop/PrestaShop#41825: adds id_product_attribute to
product_download, relaxes its unique key, and extends product.product_type
with virtual_combinations.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Author: PrestaEdit

upgrade/sql/9.2.0.sql

@@ -106,3 +106,9 @@ CREATE TABLE IF NOT EXISTS `PREFIX_b2b_role_authorization_role` (
 
 -- https://github.com/PrestaShop/PrestaShop/pull/41028
 /* PHP:ps_920_business_entities_tabs(); */;
+
+/* https://github.com/PrestaShop/PrestaShop/pull/41825 */
+/* virtual_combinations product type: one downloadable file per combination */
+ALTER TABLE `PREFIX_product_download` ADD COLUMN `id_product_attribute` INT(10) UNSIGNED NOT NULL DEFAULT 0 AFTER `id_product`;
+ALTER TABLE `PREFIX_product_download` DROP INDEX `id_product`, ADD UNIQUE KEY `id_product` (`id_product`, `id_product_attribute`);
+ALTER TABLE `PREFIX_product` MODIFY `product_type` ENUM('standard', 'pack', 'virtual', 'combinations', 'virtual_combinations', '') NOT NULL DEFAULT '';