public void Insert(DateTime date, ulong record_number)
{
if (MaxDateToRecordNumbers.TryGetValue(date, out List <ulong> record_numbers) == false)
{
record_numbers = new List <ulong>();
MaxDateToRecordNumbers[date] = record_numbers;
}
if (record_numbers.Contains(record_number) == false)
{
record_numbers.Add(record_number);
}
}
