UserMerge

UserMerge
Merges several users into one account.
Status:	stable
Developer:	Tim Laqua, Thomas Gries, Siebrand Mazeland
Extension type:	MediaWiki
Edition:	BlueSpice free
Dependencies:	MediaWiki
License:	GPL v3 only
Activated:	Yes
Category:	Administration

UserMerge extension allows wiki users with the usermerge permission (Bureaucrat by default) to merge one Wiki user's account with another Wiki user's account.

The extension allows to

• merge (refer contributions, texts, watchlists, edit count of a first account A to a second account B
• delete the first account A after the merge (option box)

Limitations

• you cannot delete a user A without having merged the user A to B
• you cannot merge your own account (logged-in user) into a different user

Extras

• if you omit the "New User" field, then the extension auto-populates the New User as "Anonymous" (user_id 0), and ask you to confirm a merge to Anonymous. This is used for user deletion: you first empty (merge to user 0) contributions of a user A, and then delete the user A.
• If your version of the extension complains about an empty "New User" field you can fill in  "Anonymous".

For more information please visit MediaWiki.