public Task <SourceSubscription> AddSubscriptionAsync(SourceSubscription subscription)
{
return(TryCatch(async() =>
{
ValidateSubscriptionOnAdd(subscription);
subscription.Id = 0;
var storageSubscription = await _storageBroker.InsertSourceSubscriptionAsync(subscription);
await UpdateSubscriptionVacanciesAsync(storageSubscription);
return storageSubscription;
}));
}