{
  "summary": [
    {
      "name": "demo_presence",
      "title": "demo_presence",
      "primary": [
        "id"
      ]
    }
  ],
  "fields": [
    {
      "name": "id",
      "title": "主键",
      "type": "str",
      "length": 255,
      "nullable": "no"
    },
    {
      "name": "session_id",
      "title": "演示会话ID",
      "type": "str",
      "length": 255
    },
    {
      "name": "user_id",
      "title": "在线用户ID",
      "type": "str",
      "length": 255
    },
    {
      "name": "user_name",
      "title": "在线用户名称",
      "type": "str",
      "length": 255
    },
    {
      "name": "joined_at",
      "title": "加入时间",
      "type": "datetime"
    },
    {
      "name": "last_seen_at",
      "title": "最后活跃时间",
      "type": "datetime"
    }
  ],
  "indexes": [
    {
      "name": "idx_presence_session",
      "idxtype": "index",
      "idxfields": [
        "session_id"
      ]
    },
    {
      "name": "idx_presence_user",
      "idxtype": "index",
      "idxfields": [
        "user_id"
      ]
    }
  ],
  "codes": []
}