public class Room : Entity
{
    public Room()
    {
        RoomRates = new HashSet<RoomRate>();
    }


    public string Name { get; set; }

    public ICollection<RoomRate> RoomRates { get; }

    public int HotelId { get; set; }

    public void AddRoomRate(DateRange period, Money price)
    {

       RecalculateRates(period);

       RoomRates.Add(new RoomRate{Period = period, Price = price, RoomId = Id});

    }

public class RoomRate : Entity
{

    public DateRange Period { get; set; }

    public Money Price { get; set; }

    public int RoomId { get; set; }

    public void SetStart(DateTime start) {
        Period = new DateRange(start, Period.End);

    }

    public void SetEnd(DateTime end)
    {
        Period = new DateRange(Period.Start, end);

    }


}

foreach (var rateToReArrange in ratesToReArrange)
        {
            var periodToReArrange = rateToReArrange.Period;

            if (periodToReArrange.Contains(ratePeriod))
            {
                RoomRates.Add(new RoomRate
                {
                    Period = new DateRange(periodToReArrange.Start, dayBeforePeriodStarts),
                    Price = rateToReArrange.Price, RoomId = rateToReArrange.RoomId
                });



                rateToReArrange.SetStart(dayAfterPeriodEnds);

                return;


            }

            if (rateToReArrange.Period.StartsInRange(ratePeriod))
            {
                rateToReArrange.SetStart(dayAfterPeriodEnds);

                return;
            }

            if (rateToReArrange.Period.EndsInRange(ratePeriod))
            {
                rateToReArrange.SetEnd(dayBeforePeriodStarts);

                return;
            }
        }

room.AddRoomRate(new DateRange(request.Start,request.End), new Money(request.Amount, request.Currency.ToString()));

        _context.Rooms.Update(room);

        await _context.SaveChangesAsync(cancellationToken);