[BUG]Core Datasource at <> is not bound to a Session; attribute refresh operation cannot proceed

[diginovo]

SQLBot Version
1.10.0

Run Mode
Is it running in a Docker container or running from source code?
1panel

Describe the bug
数据源是微软sqlserver 2019，添加数据源正常，但是几小时后，数据源预览会报错，直接对数据源问答也不报错，但是在maxkb 通过MCP调用sqlbot 数据源问答会报一样的错误。请看看是不是缓存连接池的问题，请优化一下！

ERROR:{"message":"Execute SQL Failed","traceback":"Traceback (most recent call last):\n File "/opt/sqlbot/app/apps/chat/task/llm.py", line 1183, in execute_sql\n return exec_sql(ds=self.ds, sql=sql, origin_column=False)\n ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\nsqlalchemy.orm.exc.DetachedInstanceError: Instance <CoreDatasource at 0x7b7e4a62b110> is not bound to a Session; attribute refresh operation cannot proceed (Background on this error at: https://sqlalche.me/e/20/bhk3)\n","type":"exec-sql-err"}

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