anchor.diff:  
       type CommodityConfig = {
           Commodity: Commodity;
  -        GoogleFinanceKey: string;
  +        GoogleFinanceSearchSymbol: string;
       }
   
       type CommodityPrice = {
  
positive.code:             [x] Fetch page and extract prices
              [x] Generate next URL
  
          
  
  
      
  *)
  
  module Main =
  
negative.code:             match usage.FirstAppeared, cpDB.FirstDate with
              | firstAppeared, firstDate when firstAppeared < firstDate ->
                  let endDate = firstDate.AddDays(-1.0)
                  let baseURL = generateBaseURL config.GoogleFinanceSearchSymbol usage.FirstAppeared (Some endDate)
                  getPrices baseURL 0 usage.Commodity
              | otherwise -> List.Empty
          
  