[
  {
    "id": "1",
    "user_id": 1,
    "exhibitor_id": 1,
    "content": "您好，我对贵公司的智能机器人很感兴趣，想了解更多详情。",
    "send_time": "2026-02-02T10:20:00Z",
    "status": "unread"
  },
  {
    "id": "2",
    "user_id": 2,
    "exhibitor_id": 2,
    "content": "请问贵公司的太阳能板使用寿命是多久？",
    "send_time": "2026-02-02T11:45:00Z",
    "status": "unread"
  },
  {
    "id": "3565",
    "user_id": 1,
    "exhibitor_id": 1,
    "content": "9999",
    "send_time": "2026-02-02T12:51:45.022Z",
    "status": "unread"
  },
  {
    "id": "a9bc",
    "user_id": 1,
    "exhibitor_id": 1,
    "content": "555",
    "send_time": "2026-02-02T13:01:09.339Z",
    "status": "unread"
  },
  {
    "id": "6f02",
    "user_id": 1,
    "exhibitor_id": 1,
    "content": "444",
    "send_time": "2026-02-02T13:01:17.572Z",
    "status": "unread"
  },
  {
    "id": "d657",
    "user_id": 1,
    "exhibitor_id": 1,
    "content": "3333",
    "send_time": "2026-02-02T13:11:15.665Z",
    "status": "unread"
  }
]