public async Task <List <UserNotificationWithNotification> > GetUserNotificationsAsync(Guid userId, UserNotificationState?state = null, int skipCount = 0, int maxResultCount = int.MaxValue, DateTime?startDate = null, DateTime?endDate = null)
 {
     return(await _store.GetUserNotificationsAsync(userId, state, skipCount, maxResultCount, startDate, endDate));
 }