Libra CorruptError: database disk image is malformed

Kobo Libra, *622 firmware.

The first time I connected it read all the titles. It only gave an error trying to read the annotations via Kobo Utilities.

I ejected and went to menu for the book and selected Export Highlights (the optional extra menu item that is enabled in .conf). That only had the first 1/4 of the book annotations. Going into the book and looking at annotations showed the last 3/4s of annotations gone.

Then reconnecting to Calibre I can't "communicate" at all. No titles listed.
I have sqliteman and DB browser for SQlite. But I'm only familiar with full SQLserver tools and years ago.

I've made a copy of KoboReader.sqlite and BookReader.sqlite

I searched here but couldn't see a thread on fixing the database.

a) I assume the last 3/4 of annotations are gone, or might some sort of repair work?

b) How is it fixed? There are no other unsaved annotations and all books are on Calibre.

c) I suppose all reading positions would be lost on a nuke it type repair, Not a big problem