I have found the issue with the database migration, so the upgrade to the latest version of lemmy can proceed.
0.19.5 brings a lot of smaller bugfixes. See release notes here for more information. I will also upgrade the database to a newer version(postgres 16).
For this upgrade there will be downtime and I expect it to last around 1 hour or less. If there are any major issues with the upgrade, you can check the uptime site here or site status here
Local time can be seen here