There is an automatically generated backup of the db(s) in
~/.config/darktable named data.db-pre-xxx respectively
library.db-pre-xxx if you move from 3.0.1 to 3.0.2 for example. I'm not
sure if this automatism also works between master versions, but it could
be worth to look for the backup files.
Best Regards
Peter Harde
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