loading only expenses in hisotry controller

Core/Core/Controllers/HistoryController.cs

@@ -34,7 +34,8 @@ namespace Core.Controllers
             var transactions = Context.Files
                 .Where(f => f.UserID == userID)
-                .SelectMany(f => f.Transactions);
+                .SelectMany(f => f.Transactions)
+                .Where(t => t.Amount < -2);
             if (!transactions.Any())
                 return null;