wip: tiered deliver price

yshop-drink-boot3/sql/upgrade_delivery_rules.sql

@@ -0,0 +1,14 @@
+-- ============================================================
+-- 门店配送规则(阶梯配送费)升级脚本
+-- 将固定的"配送价格"扩展为基于距离区间的"配送规则"
+-- 配送规则存为 JSON 数组: [{minKm,maxKm,price}]，区间左闭右开
+-- 无规则匹配时回退 delivery_price(默认配送费)
+-- ============================================================
+
+ALTER TABLE `yshop_store_shop`
+  ADD COLUMN `delivery_rules` text CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci COMMENT '配送规则JSON:[{minKm,maxKm,price}]' AFTER `delivery_price`;
+
+-- 可选:为已有支持外卖的门店初始化一条示例规则(请按需调整)
+-- UPDATE `yshop_store_shop`
+--   SET `delivery_rules` = '[{"minKm":0,"maxKm":3,"price":8},{"minKm":3,"maxKm":5,"price":12}]'
+--   WHERE `distance` > 0 AND `delivery_rules` IS NULL;