public void RemoveBudgetFromUser(Guid budgetId, Guid userId)
        {
            var relationship = new UserToBudget { UserId = userId, BudgetId = budgetId };

            db.Delete(relationship);
        }
        public void AddBudgetToUser(Guid budgetId, Guid userId)
        {
            var relationship = new UserToBudget { UserId = userId, BudgetId = budgetId };

            db.Insert(relationship);
        }