get last n elements of list

Service/ServiceUtils/AiContextLoader.cs

@@ -128,7 +128,9 @@ namespace BeWo.Service.ServiceUtils
 			if(sample_count == -1)
 				return dcs;
 
-			return dcs.Take(sample_count.Value);
+			var skip = Math.Max(0, dcs.Count - sample_count.Value);
+
+			return dcs.Skip(skip);
 		}
 
 		private static CompactCustomerDC loadCompactCustomerDC(Dictionary<TableID, long[]> context_reference)