@MontyJ
Have tried (re)moving the server.key and server.csr. etc. files so CW cannot find them?
You asked how to read the app.db file. Sqlitebrowser can read and change them. However if you do not recognise anything inside this file then that does not help. (I could not find anything useful either, but my setup of CW is Docker and very basic. Only for testing purposes.
I would make a backup of the current CW installation and reinstall CW and make it work without https. (If it works with http you can make https work with apache (reverse proxy) and Let's Encrypt.
Maybe you can check where there are differences between the old and new setup that can help you fix the old setup.
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