docs(sxsy80): 迁移文档、清理脚本与 wa_merchandise 提取工具

补充数据迁移说明与 cleanup SQL；增加从 dump 提取保留 id 与生成 INSERT 的脚本及产物。

Made-with: Cursor

docs/sql/com-sxsy80-data-cleanup.sql

@@ -13,11 +13,10 @@ TRUNCATE TABLE `wa_order`;
 TRUNCATE TABLE `wa_withdraw`;
 TRUNCATE TABLE `eb_store_order`;
 
--- 寄售商品：仅保留 created_at >= 2026-04-24 且卖家 user_id 在保留名单内
+-- 寄售商品：与迁移文档一致——从源 dump 解析 id 列表（见 wa_merchandise_keep_ids_from_dump_sxsy80.txt），删库中不在集合内的行
 DELETE FROM `wa_merchandise`
-WHERE NOT (
-  `created_at` >= '2026-04-24 00:00:00'
-  AND `user_id` IN (92566,92801,92839,93004,92637,92965,93093,93096,93116,92787,93121,93129,92884,93007,93020,93094,93099,93110,92638)
+WHERE `id` NOT IN (
+  163212,163213,163214,163223,163224,163225,163226,163231,163234,163235,163237,163239,163244,163245,163246,163254,163255,163259
 );
 
 -- 日志类：仅保留名单内 user_id