Make available balance date-dependent

postgres/queries/categories.sql

@@ -67,10 +67,12 @@ SELECT
         LEFT JOIN categories ON categories.id = transactions.category_id
         LEFT JOIN budgets ON budgets.income_category_id = categories.id
         WHERE budgets.id = @budget_id
+        AND transactions.date < @from_date
     ) - (
         SELECT SUM(assignments.amount)
         FROM assignments
         INNER JOIN categories ON categories.id = assignments.category_id
         INNER JOIN category_groups ON category_groups.id = categories.category_group_id
         WHERE category_groups.budget_id = @budget_id
+        AND assignments.date < @from_date
     ))::decimal(12,2);