Have run the upgrade script a second time:
Starting from 29 Updates are being applied to xerte
Current database version - 29
Database is up to date, nothing to do
Cleanup up files that are really in the way
File themes/Nottingham/blackround/responsivetext.css not found (already deleted :-) )
File themes/Nottingham/btnTopPurple/responsivetext.css not found (already deleted :-) )
File themes/Nottingham/darkgrey/responsivetext.css not found (already deleted :-) )
File themes/Nottingham/flatblue/responsivetext.css not found (already deleted :-) )
File themes/Nottingham/flatred/responsivetext.css not found (already deleted :-) )
File themes/Nottingham/flatwhite/responsivetext.css not found (already deleted :-) )
File themes/Nottingham/orangepurple/responsivetext.css not found (already deleted :-) )
File themes/Nottingham/sketch/responsivetext.css not found (already deleted :-) )
File modules/xerte/parent_templates/Nottingham/common_html5/mediaelement/DO NOT CHANGE THESE FILES. USE -src- FOLDER.txt not found (already deleted :-) )
Done
There are logs in the error dirctory now, the CRITICAL.log says
<p>13:01:42 - 11/01/2022 CRITICAL<Br>Failed to create new template record for the database<Br>INSERT INTO templatedetails (creator_id, template_type_id, date_created, date_modified, number_of_uses, access_to_whom, template_name, extra_flags)
VALUES (?, ?, ?, ?, ?, ?, ?, ?)</p>*