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    "approval_grace_hours": 48,
    "heartbeat_timeout_min": 30,
    "updated_at": "2026-03-02"
  },
  {
    "device_group": "본사-인사",
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    "updated_at": "2026-03-02"
  },
  {
    "device_group": "리테일-강남지점",
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  },
  {
    "device_group": "리테일-여의도지점",
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    "heartbeat_timeout_min": 30,
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  },
  {
    "device_group": "콜센터",
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    "heartbeat_timeout_min": 30,
    "updated_at": "2026-05-07"
  },
  {
    "device_group": "트레이딩룸",
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    "updated_at": "2026-08-20"
  },
  {
    "device_group": "개발",
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    "updated_at": "2026-03-02"
  },
  {
    "device_group": "임원실",
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    "heartbeat_timeout_min": 120,
    "updated_at": "2026-06-11"
  },
  {
    "device_group": "외부협력-PC",
    "approval_grace_hours": 24,
    "heartbeat_timeout_min": 30,
    "updated_at": "2026-07-01"
  },
  {
    "device_group": "공용노트북",
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    "heartbeat_timeout_min": 60,
    "updated_at": "2026-09-01"
  }
]