提交

deploy/sql/migrations/overseas/baiyue_lastleg/V38__allow_multi_order_delivery_returns.sql

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+-- 同一派送可按多张原订单生成退回异常；活动批次由派送行锁和来源数量校验保护。
+-- 只调整索引，不修改异常、签收、库存或资金事实；重复执行跳过已完成项。
+USE baiyue_lastleg;
+
+SET @ddl = IF(NOT EXISTS (SELECT 1 FROM information_schema.statistics WHERE table_schema = DATABASE() AND table_name = 'll_exception_order' AND index_name = 'idx_ll_exception_delivery_return'),
+  'ALTER TABLE ll_exception_order ADD KEY idx_ll_exception_delivery_return (customer_id, delivery_order_id, exception_type)', 'SELECT 1');
+PREPARE stmt FROM @ddl; EXECUTE stmt; DEALLOCATE PREPARE stmt;
+SET @ddl = IF(EXISTS (SELECT 1 FROM information_schema.statistics WHERE table_schema = DATABASE() AND table_name = 'll_exception_order' AND index_name = 'uk_ll_exception_delivery_return'),
+  'ALTER TABLE ll_exception_order DROP INDEX uk_ll_exception_delivery_return', 'SELECT 1');
+PREPARE stmt FROM @ddl; EXECUTE stmt; DEALLOCATE PREPARE stmt;