static void UserTicketLogic_Saving(UserEntity user)
{
if (!user.IsNew && user.IsGraphModified & user.InDBEntity(u => u.PasswordHash != user.PasswordHash))
user.UserTickets().UnsafeDelete();
}
static int CleanExpiredTickets(UserEntity user)
{
DateTime min = TimeZoneManager.Now.Subtract(ExpirationInterval);
int expired = user.UserTickets().Where(d => d.ConnectionDate < min).UnsafeDelete();
int tooMuch = user.UserTickets().OrderByDescending(t => t.ConnectionDate).Skip(MaxTicketsPerUser).UnsafeDelete();
return expired + tooMuch;
}