How to correctly update batch according to post.id

This is one reason why you always have a plain ID auto increment column in your tables to make every record unique.

I'm not entirely sure you have to, but that's just my gut feel and not based on any scientific evidence.

Post ID and Term ID already give that unique-ness per row, so not having to deal with that intermediate ID seems to make set up simpler, however I'm open to suggestions where there's clear benefit to db performance or race conditions

Did a quick search on Google but couldn't see anything obvious.