private Validation <ValidationError, InterestedSeries> Validate(RemoveInterested request) =>
 (Helpers.SubscriberMustBeValid(request.Subscriber), Helpers.IdListMustHaveElements(request.AnimeId))
 public Task <Either <DomainError, Unit> > Handle(RemoveInterested request, CancellationToken cancellationToken)
 {
     return(Validate(request)
            .ToEither(nameof(Commands.RemoveInterested))
            .BindAsync(RemoveInterested));
 }