请以标准的json格式描述一次成功登陆的日志记录，包含所有信息都完整
{
  "log_type": "login",
  "timestamp": "2023-10-05T12:34:56Z",
  "user_id": "12345",
  "username": "john_doe",
  "ip_address": "192.168.1.1",
  "user_agent": "Mozilla/5.0",
  "success": true,
  "error_code": null,
  "error_message": null
}
user
{
  "log_type": "login",
  "timestamp": "2023-10-05T12:34:56Z",
  "user_id": "12345",
  "username": "john_doe",
  "ip_address": "192.168.1.1",
  "user_agent": "Mozilla/5.0",
  "success": true,
  "error_code": null,
  "error_message": null
}
assistant