How to properly copy the data of the column in flask sqlalchemy?

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Python

flask

I have a function that output Average Budget and Average Salary, the problem is when the computation executed for the average salary, also the average budget affected. I tried to use simple .copy()

routes.py:

@app.route("/user/<int:user_id>", methods=['GET', 'POST'])
@app.route("/<int:user_id>", methods=['GET', 'POST'])
@login_required
def user(user_id):
    budget_count = Budgets.query.filter_by(user_id=current_user.id).count()
    total_budget = current_user.current_budget
    added_budget = 0
    for budget in total_budget:
        added_budget = added_budget + budget.new_budget
    try:
        savings_budget = added_budget / budget_count
    except ZeroDivisionError:
        savings_budget = added_budget / 1

    average_budget = total_budget.copy()
    budget_sum = 0
    for average in average_budget:
        budget_sum = budget_sum + average.new_budget
    try:
        average_budget = budget_sum / budget_count
    except ZeroDivisionError:
        average_budget = budget_sum / 1
    
    user = User.query.get_or_404(user_id)
    return render_template("user.html", title=current_user.username, user=user, budget_count=budget_count, savings_budget=savings_budget, average_budget=average_budget)

@app.route("/expenses/<int:budget_id>", methods=['GET', 'POST'])
def expenses(budget_id):
    form = ExpenseForm()
    budget = Budgets.query.get(budget_id)
    if form.validate_on_submit():
        budget_expense = Expenses(categories=form.categories.data, category_cost=form.cost.data, budget_id=budget.id)
        db.session.add(budget_expense)
        db.session.commit()
        return redirect(url_for('expenses', budget_id=budget.id))
    posted_expenses = Expenses.query.filter_by(budget_id=budget.id)

    total = 0
    for post in posted_expenses:
        total = total + post.category_cost
    total_savings = budget.new_budget - total
    budget.new_budget = total_savings
    db.session.commit()
    return render_template("expenses.html", budget=budget, form=form, posted_expenses=posted_expenses, total_savings=total_savings)

What syntax or function to copy the data so that when the original data updated, the copy data not affected?

What I have tried:

I tried to append the data into a list then get the items in the list but it has the same output.