Diffrence on columns in tables stock_available & product_attribute

[redrum]

I'm doing a migration from osCommerce to PrestaShop

I noticed that both tables 'ps_stock_available' and 'ps_product_attribute' contain the columns 'quantity' and 'location'.
As far as I can see its the data in the table 'ps_stock_available' PrestaShop is looks in when we want to get information about quantity and location.

So, whats the reason 'quantity' and 'location' exists in two different tables?
Does the one table do something that the other doesn't, or are the mentioned columns in table 'ps_product_attribute' redundant?

Cheers!

[redrum]

53 minutes ago, redrum said:

As far as I can see its the data in the table 'ps_stock_available' PrestaShop is looks in when we want to get information about quantity and location.

I noticed that checking for the quantity of a product (with attribute), PrestaShop checks the table 'ps_product_attribute'.
And when checking for a product stock location, PrestaShop looks in the table 'ps_stock_available'.

Never the less, my questions still remains.

Edited April 19, 2021 by redrum
Sorry, that was a misstake (see edit history)

[musicmaster]

Prestashop is very conservative when it comes to deleting fields that are no longer used. There is also for example a big overlap between ps_product and ps_product_shop. As far as I know the main reason is fear that some modules might no longer work if they delete a field.

[redrum]

Ok, I see.
Thanks for enlighten me.