fix bug

doc/sql/transport/blade_receivable_payable_cargo_fee_change_reason_20260821.sql

@@ -0,0 +1,27 @@
+-- MySQL 5.7+ 兼容：为应收应付货物费用明细增加变更原因。
+-- 请在 transport 数据库执行。本脚本使用 information_schema 判断，可重复执行。
+
+DELIMITER $$
+
+DROP PROCEDURE IF EXISTS `upgrade_receivable_payable_cargo_fee_change_reason_20260821`$$
+CREATE PROCEDURE `upgrade_receivable_payable_cargo_fee_change_reason_20260821`()
+BEGIN
+  DECLARE db_name varchar(128);
+  SET db_name = DATABASE();
+
+  IF NOT EXISTS (
+    SELECT 1
+    FROM information_schema.columns
+    WHERE table_schema = db_name
+      AND table_name = 'blade_receivable_payable_cargo_fee'
+      AND column_name = 'change_reason'
+  ) THEN
+    ALTER TABLE `blade_receivable_payable_cargo_fee`
+      ADD COLUMN `change_reason` varchar(300) DEFAULT NULL COMMENT '变更原因' AFTER `remark`;
+  END IF;
+END$$
+
+CALL `upgrade_receivable_payable_cargo_fee_change_reason_20260821`()$$
+DROP PROCEDURE `upgrade_receivable_payable_cargo_fee_change_reason_20260821`$$
+
+DELIMITER ;