This introduces two new management commands:

evolution-project-sig: Lists, shows, or deletes project signatures
mark-evolution-applied: Marks one or more evolutions as applied to

  the database.

These are advanced commands that are only intended for use when

diagnosing and repairing database upgrades, under the guidance of a

developer/support representative. They can permanently damage database

upgrades if not careful.
Both commands prompt for confirmation before executing any destructive

operations, with a big scary warning.

I've had these around in my tree for a while, using them to work on

database repairs. They've been pretty thoroughly tested.