Rename Trac user names
This plugin is new and unfinished. Do not use it yet.
This plugin provides an admin panel and command to rename user names. An interface is provided to other plugins so these can implement a renamer module for their own DB tables.
If you have any issues, create a new ticket.
Download the zipped source from here.
trac-admin /path/to/trac/environment renameuser oldname newname