How can one do a clean uninstall of Atahualpa, including all database entries and those meta/custom fields etc?

I imagine it should be quite simple with a single command since the settings all seem to bear the bfa_ata prefix. But what do I know about these kinds of things...

Might I ask 'Why?'

backup the database first
you need to issue two sql requests

delete FROM `wp_options` WHERE `option_name` like '%bfa%'

will delete all the Atahualpa options and

delete FROM `wp_postmeta` WHERE `meta_key` like '%bfa%'

should delete all the 'meta' information

Thank you!

Edit: Oh, yes, you may ask: I closed some of my websites and changed one to a custom-made theme. And on that one there seems to be some trouble with the "meta title" custom fields and the SEO Plugin. Also, I found loads of old, unused entries in the wp_options table (obviously created by plugins I already uninstalled years ago) and thought it'd only make sense to clean up after 5 or 6 years.