18% of people running Nextcloud don't know what database they are using

https://programming.dev/post/36876896

If you’re running it in a prebuilt container, as long as it works it shouldn’t matter.

Of course, when your database gets corrupted after Nextcloud updates because you had an app running that isn’t supported in the new version, it will suddenly matter a lot.

Will Nextcloud run apps not marked as compatible with that version?
Bugs still happen. Just did with the most recent version and the polls app and mysql