public void RemoveCategoryFromBudget(Guid categoryId, Guid budgetId)
        {
            var relationship = new BudgetToCategory { CategoryId = categoryId, BudgetId = budgetId };

            db.Delete(relationship);
        }
        public void AddCategoryToBudget(Guid categoryId, Guid budgetId)
        {
            var relationship = new BudgetToCategory { CategoryId = categoryId, BudgetId = budgetId };

            db.Insert(relationship);
        }