I’m on multisite mode. I can see that for each site of the network there are 4 ‘pmxi’ tables. What are they for?
They’re something like this
siteprefix_pmxi_files
siteprefix_pmxi_imports
siteprefix_pmxi_posts
siteprefix_pmxi_templates
1
This doesn’t sound like something coming from WordPress core.
Quick search online got pretty slim results, but it seems to be asscociated with WP All Import plugin.