Darktable Error Opening Database - 3 options (close, restore, delete) are not working

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How to fix corrupted database?

hopefully there are some backup databases stored in the same directory as data.db. You could try replacing data.db with the most recent backup (rename or copy the backup to data.db).

For Linux there are instructions: sqlite - How to recover a corrupt SQLite3 database? - Stack Overflow

Thank you for the direction. I will give it a try.