diff --git a/yunke-server/scripts/scrape_via_page.py b/yunke-server/scripts/scrape_via_page.py
index a6f29fc..ebac360 100644
--- a/yunke-server/scripts/scrape_via_page.py
+++ b/yunke-server/scripts/scrape_via_page.py
@@ -1890,25 +1890,28 @@ async def scrape_chatroom_stats(cookie_str: str, day: str | None = None):
     pruned = 0
     if day_key is None and group_recs and declared and len(group_recs) >= declared:
         import sqlalchemy as sa
-        from sqlalchemy import tuple_ as sa_tuple
 
         from app.db.base import async_session_maker
         from app.db.models import ChatGroup
 
         keep = {(r["owner_account_id"], r["room_id"]) for r in group_recs}
-        keep_list = list(keep)
         async with async_session_maker() as session:
-            for i in range(0, len(keep_list), 500):
-                chunk = keep_list[i:i + 500]
-                res = await session.execute(
+            local = (await session.execute(
+                sa.select(ChatGroup.owner_account_id, ChatGroup.room_id)
+                .where(ChatGroup.channel == "wechat")
+            )).all()
+            stale = [(o, r) for (o, r) in local if (o, r) not in keep]
+            for owner, room in stale:
+                # 逐行删(差集常态 0~几行;不用 tuple IN——asyncmy 对其参数
+                # 形态挑剔,实测 TypeError)
+                await session.execute(
                     sa.delete(ChatGroup).where(
                         ChatGroup.channel == "wechat",
-                        sa.tuple_(
-                            ChatGroup.owner_account_id, ChatGroup.room_id
-                        ).not_in(sa_tuple(chunk)),
+                        ChatGroup.owner_account_id == owner,
+                        ChatGroup.room_id == room,
                     )
                 )
-                pruned += int(res.rowcount or 0)
+            pruned = len(stale)
             await session.commit()
 
     logger.info(