Get monthly calendar

{
  "records": [
    {
      "dayOfMonth": 1,
      "shifts": [
        {
          "shiftId": 100,
          "driverId": 10,
          "driverName": "John Doe",
          "start": 1715000000,
          "end": 1715040000
        }
      ]
    }
  ]
}