新增订单待支付与支付确认后端流程

backend/migrations/000001_init.sql

@@ -57,6 +57,7 @@ CREATE TABLE rental_listings (
   price_daily DECIMAL(12,2) NOT NULL DEFAULT 0.00,
   price_weekly DECIMAL(12,2) NOT NULL DEFAULT 0.00,
   deposit_amount DECIMAL(12,2) NOT NULL DEFAULT 0.00,
+  in_transaction TINYINT(1) NOT NULL DEFAULT 0,
   status VARCHAR(32) NOT NULL DEFAULT 'draft',
   review_status VARCHAR(32) NOT NULL DEFAULT 'none',
   review_reason VARCHAR(255) NOT NULL DEFAULT '',

backend/migrations/000002_order_payment_stepwise.sql

@@ -0,0 +1,20 @@
+SET @listing_in_transaction_exists := (
+  SELECT COUNT(*)
+  FROM information_schema.columns
+  WHERE table_schema = DATABASE()
+    AND table_name = 'rental_listings'
+    AND column_name = 'in_transaction'
+);
+
+SET @add_listing_in_transaction_sql := IF(
+  @listing_in_transaction_exists = 0,
+  'ALTER TABLE rental_listings ADD COLUMN in_transaction TINYINT(1) NOT NULL DEFAULT 0 AFTER deposit_amount',
+  'SELECT 1'
+);
+PREPARE add_listing_in_transaction_stmt FROM @add_listing_in_transaction_sql;
+EXECUTE add_listing_in_transaction_stmt;
+DEALLOCATE PREPARE add_listing_in_transaction_stmt;
+
+INSERT INTO system_configs (`key`, `value`, description)
+VALUES ('order.pending_payment_timeout_minutes', '15', '订单待支付超时取消分钟数')
+ON DUPLICATE KEY UPDATE `key` = VALUES(`key`);