Thanks!
This seems like a perfect module to do some database cleaning thru cron.
For information, there was an update recently:
15.11.2021 – v.1.4.4. new features – delete unused attribute values and empty attributes
If you check at https://www.presteamshop.com/en/prestashop-modules/one-page-checkout-prestashop.html you will see that 4.0.19 is the latest version for PS 1.7
Its not super easy to find that theme on this forum, but here it is
https://www.nulledfrm.com/threads/new-prestashop-amazing-theme-version-4-0-2-last-one-is-available.33180/#post-220589
You could try one of these two free modules. I haven't tried them myself thou.
https://store.getdatakick.com/en/modules/login-as-customer
https://github.com/rowanfuchs/PrestaShop-login-as-a-customer