public async Task <PackageSubscriber> Add(PackageSubscriber packageSubscriber, CancellationToken cancellationToken)
        {
            await _context.PackageSubscribers.AddAsync(packageSubscriber, cancellationToken);

            await _context.SaveChangesAsync(cancellationToken);

            return(packageSubscriber);
        }
 public Task Delete(PackageSubscriber packageSubscriber, CancellationToken cancellationToken)
 {
     _context.PackageSubscribers.Remove(packageSubscriber);
     _context.SaveChanges();
     return(Task.CompletedTask);
 }