During the last weeks we saw a few error reports about issues during the upgrade from a 2.4.x version to the currently latest stable version 20220803.1 (2.5.4). Some of these issues are caused by previous tests of a development version of the 2.5-branch and a later downgrade to a 2.4-x version with orphaned but remaining tables for 2.5 in the database. That broke the upgrade script because we never thought about such a situation when writing the code. Some other issues are caused by our (mainly my) carelessness and for us unexpected server configuration.
I opened a pull request on Github as work in progress (unfinished at the time of writing) to solve the issues, where possible. To keep the reports at one place where i can find them easily I will tie them now to this thread.
Trenne niemals Müll, denn er hat nur eine Silbe!