优化

deploy/sql/migrations/cn/baiyue_firstleg/V1__align_schema_baseline.sql

@@ -0,0 +1,17 @@
+-- Region: CN
+-- Schema: baiyue_firstleg
+-- Purpose: 将一件代发作业托盘码可空性收敛到当前空库基线。
+-- Preconditions: 连接必须指向 baiyue_firstleg；fl_dropship_pallet.pallet_no 不存在 NULL。
+-- Postconditions: pallet_no 为 varchar(32) NOT NULL。
+
+SET NAMES utf8mb4;
+
+SET @guard = IF(
+  EXISTS (SELECT 1 FROM fl_dropship_pallet WHERE pallet_no IS NULL LIMIT 1),
+  'SIGNAL SQLSTATE ''45000'' SET MESSAGE_TEXT = ''fl_dropship_pallet.pallet_no contains NULL''',
+  'SELECT 1'
+);
+PREPARE stmt FROM @guard; EXECUTE stmt; DEALLOCATE PREPARE stmt;
+
+ALTER TABLE fl_dropship_pallet
+  MODIFY COLUMN pallet_no varchar(32) NOT NULL COMMENT '现场扫描的系统DP托盘码';