MobileRead Forums - View Single Post - Calibre v9 DB changes break calibre-web

dinosm · 01-30-2026, 10:02 AM

Calibre v9 has made changes to its DB schema resulting in a broken calibre-web.

Calibre-web shows me an empty library, and when I click on e.g. 'About', it gives an error message about DB errors which include the fact that book.isbn is missing from the DB.

DB changes were not documented in the website changelog, it would have been helpful to have those mentioned there.

Now, I am guessing the only robust way to fix this is to wait for calibre-web's developer to update their software, but I'm just posting this here as I updated Calibre today and couldn't find anything online about this issue.

I ended up downgrading Calibre back to 8.x, and restoring a backup of its database to get my calibre-web back.

01-30-2026, 10:02 AM	#1
dinosm Member Posts: 22 Karma: 198 Join Date: Nov 2024 Device: Pocketbook Inkpad Color 3	Calibre v9 DB changes break calibre-web Calibre v9 has made changes to its DB schema resulting in a broken calibre-web. Calibre-web shows me an empty library, and when I click on e.g. 'About', it gives an error message about DB errors which include the fact that book.isbn is missing from the DB. DB changes were not documented in the website changelog, it would have been helpful to have those mentioned there. Now, I am guessing the only robust way to fix this is to wait for calibre-web's developer to update their software, but I'm just posting this here as I updated Calibre today and couldn't find anything online about this issue. I ended up downgrading Calibre back to 8.x, and restoring a backup of its database to get my calibre-web back.