Comment 10 for bug 526264

The additions do not include the .db extension (as the person who replied to the upstream bug report mistakenly thought); only .sqlite, .sqlite3, .s3, .s3db. I can't think of anyone who uses the two latter ones.

Can someone try to submit a new upstream report with .db and .db3 as additions. I wouldn't mind if they removed the .s3 and .s3db extensions, as I doubt they are used.

For a quick workaround, add "complete -f -X '!*.@(db|sqlite)?(3)' sqlite3" to ~/.bash_completion.