public static ArticleInfo GetArticleInfo(this ArticleData data) => new ArticleInfo(
     data.Name,
     data.Created,
     data.Ends,
     data.IsClosed,
     data.IsSold);
 public static PriceInfo GetPriceInfo(this ArticleData data) => new PriceInfo(
     data.BidPrice,
     data.PurchasePrice,
     data.FinalPrice);