private ICheckInEvent CreateEvent(ICheckInChange checkInChange)
 {
     return(new CheckInChangedEvent(checkInChange.ChangeId, checkInChange.PatientId, checkInChange.CheckInStatus, DateTimeOffset.UtcNow.ToUnixTimeSeconds()));
 }
 public async Task SaveChange(ICheckInChange checkInChange)
 {
     _eventStream.Add(CreateEvent(checkInChange));
 }