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yelaymaths_api/prisma/migrations/20260930130000_add_refund_request/migration.sql

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+-- 退款申请：iOS 用户向 Apple 申请退款后，平台发来的退款问询落库，供后台查看
+CREATE TABLE `refund_requests` (
+    `id` INTEGER UNSIGNED NOT NULL AUTO_INCREMENT,
+    `pay_order_id` VARCHAR(64) NOT NULL,
+    `order_id` INTEGER UNSIGNED NULL,
+    `reason` VARCHAR(255) NULL,
+    `provide_status` VARCHAR(4) NULL,
+    `our_result` TINYINT NOT NULL,
+    `our_evidence` VARCHAR(255) NULL,
+    `query_count` INTEGER UNSIGNED NOT NULL DEFAULT 1,
+    `created_at` DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3),
+    `updated_at` DATETIME(3) NOT NULL,
+
+    UNIQUE INDEX `refund_requests_pay_order_id_key`(`pay_order_id`),
+    INDEX `refund_requests_created_at_idx`(`created_at`),
+    PRIMARY KEY (`id`)
+) DEFAULT CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;
+
+ALTER TABLE `refund_requests` ADD CONSTRAINT `refund_requests_order_id_fkey` FOREIGN KEY (`order_id`) REFERENCES `orders`(`id`) ON DELETE SET NULL ON UPDATE CASCADE;