Session per user without login

I manage it like this,

let productId
 let clickedItemData = $w("#datasetCompare").getCurrentItem();

 if (clickedItemData !== null) {
 const numberOfItems = $w('#datasetCompare').getTotalCount();
            console.log(numberOfItems)
            $w('#datasetCompare').getItems(0, numberOfItems).then(results => {
 const items = results.items;
                items.forEach(item => {
                    wixData.remove('Compare', item._id);
                });
            });
        }

        $w("#buttonAddCompare").onClick((event) => {
 let $item = $w.at(event.context);
            clickedItemData = $item("#datasetProduct").getCurrentItem();
            productId = clickedItemData._id;

 
            wixData.query("Compare")
                .find()
                .then((results) => {
 let numberOfItems = results.totalCount;
                    console.log(numberOfItems);
 if (numberOfItems === 3) {
                        $w('#compareErrorMes').show();
                    } else {
                        wixData.insert('Compare', clickedItemData)
                    }
                })

 if (itemObj.categoryTitle === 'projectors') {
                $w('#compareBox').show();
            }
        });

The problem is if many users will enter at the same time, I think we should set a number for each user in the database. And the three products that he will add a compare database be a reference of number id of the same user.
what are you saying? How do you think it can be done?