static IObservable <Unit> AddImages(
IAuctionProcedures soap,
IImageLookup imgs,
Consent c,
AuctionHandle a) => Observable.Merge(
imgs.Get(a.LotId)
.Select(x => soap.AddImage(c, x, a.RequestId)));
static BatchProcessResult Image(AuctionHandle h) => new BatchProcessResult(Process.UploadImage, h);
static BatchProcessResult Commit(AuctionHandle h) => new BatchProcessResult(Process.Commit, h);
static BatchProcessResult Add(AuctionHandle h) => new BatchProcessResult(Process.Add, h);