Revert "```"

This reverts commit abc0674531.

迁移记录-DB变更记录/20250902前变更记录/202508111126 wor_service_request.sql

@@ -1,6 +0,0 @@
-ALTER TABLE public.wor_service_request ADD sign_code varchar(50) DEFAULT '' NULL;
-	COMMENT ON COLUMN public.wor_service_request.sign_code IS '签发编码';
-
--- 向迁移历史表插入记录
-INSERT INTO __MigrationsHistory (MigrationId, ProductVersion)
-VALUES ('202508111126 wor_service_request', '1.0.0');