Only show last month's overflow

http/budgeting.go

@@ -64,9 +64,10 @@ func (h *Handler) budgeting(c *gin.Context) {
 	firstOfPreviousMonth := firstOfMonth.AddDate(0, -1, 0)
 
 	params := postgres.GetCategoriesWithBalanceParams{
-		BudgetID: budgetUUID,
-		FromDate: firstOfMonth,
-		ToDate:   firstOfNextMonth,
+		BudgetID:     budgetUUID,
+		FromDate:     firstOfMonth,
+		ToDate:       firstOfNextMonth,
+		PrevFromDate: firstOfMonth.AddDate(0, -1, 0),
 	}
 	categories, err := h.Service.DB.GetCategoriesWithBalance(c.Request.Context(), params)
 	if err != nil {