ns = params_kw.copy()
db = DBPools()
dbname = get_module_dbname('rag')
async with db.sqlorContext(dbname) as sor:
    _id = ns.get("id", "")
    # KB 维护角色校验（按节点反查 kb_id）
    _recs = await sor.sqlExe("SELECT kb_id FROM rag_document_chunks WHERE id=${id}$", {"id": _id})
    await sor.sqlExe("COMMIT", {})
    _kb_id = getattr(_recs[0], 'kb_id', '') if _recs else ''
    from rag.init import check_kb_perm
    env = request._run_ns
    _ok, _kb, _msg = await check_kb_perm(env, sor, _kb_id, 'maintain')
    if not _ok:
        return json.dumps({"status": "error", "error": _msg}, ensure_ascii=False)
    await sor.sqlExe("DELETE FROM rag_document_chunks WHERE id=${id}$", {"id": _id})
    return {"widgettype": "Message", "options": {"user_data": {"id": _id}}}
return {"error": "failed"}