def _escape(value):
    if value is None:
        return None
    return str(value).replace("'", "''")


async def chat_session_delete(ns={}):
    """删除会话及其全部消息"""
    session_id = ns.get('session_id')
    if not session_id:
        return {'status': False, 'msg': 'session_id is required'}

    userid = ns.get('userid') or await get_user()
    if not userid:
        return {'status': False, 'msg': '未找到用户'}

    db = DBPools()
    async with db.sqlorContext('kboss') as sor:
        try:
            sessions = await sor.R('chat_session', {'id': session_id, 'userid': userid})
            if not sessions:
                return {'status': False, 'msg': '会话不存在'}

            await sor.sqlExe(
                "DELETE FROM chat_message WHERE session_id = '%s';" % _escape(session_id),
                {},
            )
            await sor.sqlExe(
                "DELETE FROM chat_session WHERE id = '%s' AND userid = '%s';"
                % (_escape(session_id), _escape(userid)),
                {},
            )
            return {'status': True, 'msg': 'delete success'}
        except Exception as e:
            return {'status': False, 'msg': 'delete failed, %s' % str(e)}


ret = await chat_session_delete(params_kw)
return ret