[GNC] Train (or Configure?) Bayesian Mapping

[Matt Wise]

Hi GnuCash users!

I've been using GnuCash for the last ~3 years and have slowly been
improving my use of various automation tools.  I'm fetching transactions
from my bank with aqbanking, but I still need to manually map transactions
to an account (such as Expenses:Grocery).  For a little while, it seemed
like Bayesian mapping was enabled for one of my bank accounts, but it did a
terrible job.  Reading the docs, I found I could delete the existing
mappings (tools -> import map editor).  However I would really like to
generate new mappings based on the past years' manually mapping I've done.
Is there a way to do that?

Alternatively, is there a way to map based on previous transactions that
have the exact same description?

Thanks so much!

Matt