There are situations where it would be good to be able to have salvage recover databases that fail verification, but don't have structural problems that could lead to data loss.

A specific example: A particular version of WiredTiger has a bug that leaves unreferenced free blocks in the database file. The bug is fixed in a newer version of WiredTiger. A database file was created that contains an unreferenced block before the bug is fixed.

It would be good to be able to fix the database without running a full salvage, that might result in recreating old data.