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After a user merge, there might be duplicate Echo notifications
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After merging two users, they might have some duplicate notifications (welcome for example).

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Change 461123 had a related patch set uploaded (by Matěj Suchánek; owner: Matěj Suchánek):
[mediawiki/extensions/Echo@master] Remove duplicate notifications after merging users

https://gerrit.wikimedia.org/r/461123

Change 461123 merged by jenkins-bot:
[mediawiki/extensions/Echo@master] Remove duplicate notifications after merging users

https://gerrit.wikimedia.org/r/461123

Etonkovidova changed the task status from Open to Stalled.Jan 22 2019, 9:49 PM
Etonkovidova moved this task from Untriaged to External on the Collaboration-Team-Triage board.
Etonkovidova added a subscriber: Etonkovidova.

I am changing the status to 'Stalled' 'External' per description of T204747

No local or global group is currently granted the 'usermerge' permission, making the extension also unused.

And per comment https://phabricator.wikimedia.org/T204747#4898099

In its current state, UserMerge isn't suitable for use on Wikimedia sites due to database performance issues, and poor integration with CentralAuth/SUL. These problems aren't insurmountable, but I don't think the time investment into fixing them is worth the ability to merge users, nor has anyone stepped up to fix them.

I would recommend/endorse undeployment until those problems can be resolved, either by improving the database schema so UserMerge doesn't have to make unindexed, expensive database update queries, or some redirect thing like Tgr has suggested.