Immich update issues, too old to use existing solutions

I have Immich installed as an app (App Version: v2.3.1, Version: 1.10.13) and I’d like to update it. I’m using TrueNAS SCALE 25.10.3. Based on some research, this requires some database migrations, but they seem impossible to do. My version seems to be too old to have the migrations, while the current latest version is too new, and the update fails. I’ve also found that you can use the built in backup system, but that seems to have changed a lot since my version, and I’m not sure if a backup I create still works.

Here’s the update details:

Here’s the error message: (note, I don’t have any option to select a database version when editing the app)

Any clues on how to fix/work around this issue?

Have you already switched the postgres version from 15 to 18? If you edit the app there should be a dropdown menu to choose the postgres version.

That’s the thing, I don’t see the option to change the postgres version. I suspect that it’s because my version is too old. I also found something about manually changing the version of the migration container to fix that (related to v1.13.6), but I don’t see any such container in the mentioned file.