   ALTER TABLE "tmp_activity_device" 
   ADD COLUMN "unit_code" varchar(3) COLLATE "pg_catalog"."default" DEFAULT ''::character varying;
   COMMENT ON COLUMN "tmp_activity_device"."unit_code" IS '单位';

   -- 插入为tmp_activity_device表添加列的迁移记录
INSERT INTO __MigrationsHistory (MigrationId, ProductVersion)
VALUES ('202509191411 add_column_tmp_activity_device', '1.0.0');