在删除用户前，先删除该用户及其子账号拥有的所有 bots（agent_bots 表的 ON DELETE CASCADE 会自动清理关联的

agent_mcp_servers、agent_chat_sessions、bot_shares 记录），然后再删除用户。

routes/bot_manager.py

@@ -3392,6 +3392,13 @@ async def delete_user(user_id: str, authorization: Optional[str] = Header(None))
 
     async with pool.connection() as conn:
         async with conn.cursor() as cursor:
+            # 先删除该用户及其子账号拥有的所有 bots（级联清理 mcp_servers, chat_sessions, shares）
+            await cursor.execute(
+                "DELETE FROM agent_bots WHERE owner_id = %s OR owner_id IN (SELECT id FROM agent_user WHERE parent_id = %s)",
+                (user_id, user_id)
+            )
+
+            # 再删除用户（子账号通过 parent_id ON DELETE CASCADE 自动删除）
             await cursor.execute("DELETE FROM agent_user WHERE id = %s RETURNING username", (user_id,))
             row = await cursor.fetchone()