Merge pull request 'try to do better' (#23) from feature/history into master

Reviewed-on: http://192.168.31.100:3847/Arrelin/family_budget/pulls/23

backend/src/services/expense_service.rs

@@ -153,6 +153,7 @@ impl ExpenseService {
             .map(|((year, month), expenses)| {
                 let total_amount: Decimal = expenses
                     .iter()
+                    .filter(|e| e.active)
                     .map(|e| e.amount)
                     .sum();
                 MonthlyExpenseGroup {