In my haste I accidentally downgraded my gitlab-ee omnibus installation from 13.1.11 to 11.5.11 (instead of up to 13.5) via a
sudo apt upgrade gitlab-ee=11.5.11-ee.0. It fails during reconfigure at
bash[migrate gitlab-rails database], what seems to be postgresql version incompatibilities. I cannot re-upgrade to 13.1.11 (preinstall prevents skipping a major version) and I cannot follow the upgrade path by upgrading to 11.11.8 (preinstall fails because reconfigure wasn’t successful).
The installation of 11.5 didn’t create a backup for an unknown reason. I do have a backup from version 13.0.14 when I upgraded from 13.0.14 to 13.1.11 approximately 20 hours ago.
What is the right course of action here?