-- Add subscription_user_id column to order table
ALTER TABLE `order` ADD COLUMN `subscription_user_id` bigint NOT NULL DEFAULT 0 COMMENT 'Target user ID for subscription (0=same as UserId)' AFTER `user_id`;

-- Add app_account_token column to order table for Apple IAP
ALTER TABLE `order` ADD COLUMN `app_account_token` varchar(36) DEFAULT NULL COMMENT 'Apple IAP App Account Token (UUID)' AFTER `subscribe_token`;