Producttracking::do_Not_Track Limit

Multi-Vendor Questions
1

ProductTracking::DO_NOT_TRACK when selected

he's allowed to be added to the infinite basket, How do we define limits?
you have 10000000000000000000000 products in your basket

LIMIT 9999

How Can I do it?
I have to set a limit.
2

For example, you can use hooks in the fn_add_product_to_cart function (app/functions/fn.cart.php) to correct product amount

3 
function fn_check_amount_in_stock($product_id, $amount, $product_options, $cart_id, $is_edp, $original_amount, &$cart, $update_id = 0)
{
    fn_set_hook('check_amount_in_stock', $product_id, $amount, $product_options, $cart_id, $is_edp, $original_amount, $cart);

    // If the product is EDP don't track the inventory
    if ($is_edp == 'Y') {
        return 1;
    }

    $product = db_get_row("SELECT ?:products.tracking, ?:products.amount, ?:products.min_qty, ?:products.max_qty, ?:products.qty_step, ?:products.list_qty_count, ?:products.out_of_stock_actions, ?:product_descriptions.product FROM ?:products LEFT JOIN ?:product_descriptions ON ?:product_descriptions.product_id = ?:products.product_id AND lang_code = ?s WHERE ?:products.product_id = ?i", CART_LANGUAGE, $product_id);

    if (isset($product['tracking']) &&
        Registry::get('settings.General.inventory_tracking') == 'Y' &&
        $product['tracking'] != ProductTracking::DO_NOT_TRACK
    ) {
        // Track amount for ordinary product
        if ($product['tracking'] == ProductTracking::TRACK_WITHOUT_OPTIONS) {
            $current_amount = $product['amount'];

        // Track amount for product with options
        } elseif ($product['tracking'] == ProductTracking::TRACK_WITH_OPTIONS) {
            $selectable_cart_id = fn_generate_cart_id($product_id, array('product_options' => $product_options), true);
            $current_amount = (int)db_get_field(
                "SELECT amount FROM ?:product_options_inventory WHERE combination_hash = ?s",
                $selectable_cart_id
            );
        }

        if (!empty($cart['products']) && is_array($cart['products'])) {
            $product_not_in_cart = true;
            foreach ($cart['products'] as $k => $v) {
                // Check if the product with the same selectable options already exists ( for tracking = O)
                if ($k != $cart_id) {
                    if (isset ($product['tracking']) &&
                        (
                            $product['tracking'] == ProductTracking::TRACK_WITHOUT_OPTIONS &&
                            $v['product_id'] == $product_id
                        ) ||
                        (
                            $product['tracking'] == ProductTracking::TRACK_WITH_OPTIONS &&
                            @$v['selectable_cart_id'] == $selectable_cart_id
                        )
                    ) {
                        $current_amount -= $v['amount'];
                    }
                } else {
                    $product_not_in_cart = false;
                }
            }

            if ($product['tracking'] == ProductTracking::TRACK_WITHOUT_OPTIONS &&
                !empty($update_id) && $product_not_in_cart && !empty($cart['products'][$update_id])
            ) {
                $current_amount += $cart['products'][$update_id]['amount'];
            }

            if ($product['tracking'] == ProductTracking::TRACK_WITH_OPTIONS) {
                // Store cart_id for selectable options in cart variable, so if the same product is added to
                // the cart with the same selectable options, but different text options,
                // the total amount will be tracked anyway as it is the one product
                if (!empty($selectable_cart_id) && isset($cart['products'][$cart_id])) {
                    $cart['products'][$cart_id]['selectable_cart_id'] = $selectable_cart_id;
                }
            }
        }
    }
Can be in this function

I have no idea how to do it, is there anything he can do?