fix(sql): use mysql8 compatible PDA migrations

deploy/sql/头程数据库统一增量-MySQL8.sql

@@ -8856,9 +8856,38 @@ DROP PROCEDURE IF EXISTS assert_phase3_final_schema;
 
 -- PDA 部分拣货释放策略：NULL/AUTO 按比例释放，MANUAL + [] 表示人工明确不释放。
 USE baiyue_firstleg;
-ALTER TABLE fl_loading_pick_item
+DROP PROCEDURE IF EXISTS phase3_pda_add_column;
-  ADD COLUMN IF NOT EXISTS release_mode VARCHAR(10) NULL COMMENT 'AUTO按比例释放，MANUAL按人工选择释放' AFTER item_status,
+DELIMITER $$
-  ADD COLUMN IF NOT EXISTS release_location_ids JSON NULL COMMENT '人工选择释放库位ID；空数组表示明确释放0个' AFTER release_mode;
+CREATE PROCEDURE phase3_pda_add_column(
+  IN p_table_name VARCHAR(64), IN p_column_name VARCHAR(64), IN p_definition TEXT
+)
+BEGIN
+  IF NOT EXISTS (
+    SELECT 1 FROM information_schema.columns
+     WHERE table_schema = DATABASE() AND table_name = p_table_name AND column_name = p_column_name
+  ) THEN
+    SET @phase3_pda_column_ddl = CONCAT(
+      'ALTER TABLE `', p_table_name, '` ADD COLUMN `', p_column_name, '` ', p_definition
+    );
+    PREPARE phase3_pda_column_stmt FROM @phase3_pda_column_ddl;
+    EXECUTE phase3_pda_column_stmt;
+    DEALLOCATE PREPARE phase3_pda_column_stmt;
+  END IF;
+END$$
+DELIMITER ;
+CALL phase3_pda_add_column(
+  'fl_loading_pick_item', 'release_mode',
+  "VARCHAR(10) NULL COMMENT 'AUTO按比例释放，MANUAL按人工选择释放' AFTER item_status"
+);
+CALL phase3_pda_add_column(
+  'fl_loading_pick_item', 'release_location_ids',
+  "JSON NULL COMMENT '人工选择释放库位ID；空数组表示明确释放0个' AFTER release_mode"
+);
+CALL phase3_pda_add_column(
+  'fl_inbound_pallet_allocation', 'reservation_id',
+  "BIGINT UNSIGNED NULL COMMENT '仓库预占资源唯一ID，A0共享场景用于区分托盘' AFTER location_code"
+);
+DROP PROCEDURE IF EXISTS phase3_pda_add_column;
 -- PDA 多人协作：领取粒度由整柜任务下沉为单条拣货明细。
 CREATE TABLE IF NOT EXISTS fl_loading_pick_item_assignment (
   pick_item_id BIGINT UNSIGNED NOT NULL,
@@ -8876,10 +8905,26 @@ CREATE TABLE IF NOT EXISTS fl_loading_pick_item_assignment (
   CONSTRAINT chk_loading_pick_item_assignment_type CHECK (assignment_type IN ('CLAIMED', 'ASSIGNED'))
 ) ENGINE=InnoDB COMMENT='PDA拣货明细领取与作业员分配';
 
-ALTER TABLE fl_loading_pick_operation
+DROP PROCEDURE IF EXISTS phase3_pda_replace_operation_check;
-  DROP CHECK IF EXISTS chk_loading_pick_operation_action,
+DELIMITER $$
-  ADD CONSTRAINT chk_loading_pick_operation_action
+CREATE PROCEDURE phase3_pda_replace_operation_check()
-    CHECK (action_type IN ('CLAIM', 'ASSIGN', 'ITEM_CLAIM', 'ITEM_ASSIGN', 'REVIEW'));
+BEGIN
+  IF EXISTS (
+    SELECT 1 FROM information_schema.table_constraints
+     WHERE constraint_schema = DATABASE()
+       AND table_name = 'fl_loading_pick_operation'
+       AND constraint_name = 'chk_loading_pick_operation_action'
+       AND constraint_type = 'CHECK'
+  ) THEN
+    ALTER TABLE fl_loading_pick_operation DROP CHECK chk_loading_pick_operation_action;
+  END IF;
+  ALTER TABLE fl_loading_pick_operation
+    ADD CONSTRAINT chk_loading_pick_operation_action
+      CHECK (action_type IN ('CLAIM', 'ASSIGN', 'ITEM_CLAIM', 'ITEM_ASSIGN', 'REVIEW'));
+END$$
+DELIMITER ;
+CALL phase3_pda_replace_operation_check();
+DROP PROCEDURE IF EXISTS phase3_pda_replace_operation_check;
 
 DROP PROCEDURE IF EXISTS assert_phase3_pda_item_assignment_schema;
 DELIMITER $$
@@ -8900,9 +8945,6 @@ DELIMITER ;
 CALL assert_phase3_pda_item_assignment_schema();
 DROP PROCEDURE IF EXISTS assert_phase3_pda_item_assignment_schema;
 
-ALTER TABLE fl_inbound_pallet_allocation
-  ADD COLUMN IF NOT EXISTS reservation_id BIGINT UNSIGNED NULL COMMENT '仓库预占资源唯一ID，A0共享场景用于区分托盘' AFTER location_code;
-
 -- 来源：firstleg/src/main/resources/db/phase3-carrier-schedule-query-schema.sql
 SET NAMES utf8mb4;
 USE baiyue_firstleg;

firstleg/src/test/java/com/baiyue/firstleg/repository/Phase3FinalUnifiedSqlContractTest.java

@@ -80,6 +80,17 @@ class Phase3FinalUnifiedSqlContractTest {
             .isGreaterThan(sql.lastIndexOf("CALL "));
     }
 
+    @Test
+    void unifiedEntryUsesMysql8CompatibleConditionalDdl() throws Exception {
+        String sql = normalise(Files.readString(resolveUnified()));
+
+        assertThat(sql)
+            .doesNotContain("\n  ADD COLUMN IF NOT EXISTS")
+            .doesNotContain("\n  DROP CHECK IF EXISTS")
+            .contains("CREATE PROCEDURE phase3_pda_add_column")
+            .contains("CREATE PROCEDURE phase3_pda_replace_operation_check");
+    }
+
     @Test
     void legacySplitIndexesAreOnlyDroppedAndNeverRecreated() throws Exception {
         String sql = normalise(Files.readString(resolveUnified()));