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Re:Story of Mattermost: Open-Sourced Competitor to Slack by the_icelander on Monday December 30, 2019 @12:04PM (#21914818)
Archiving a channel in Mattermost just sets a flag in the database. Once the bad actor is removed a simple query can restore the channels they archived. Something like: `UPDATE Channels SET DeleteAt = 0 WHERE DeleteAt > [some timestamp]`

There's also a CLI command to restore the channels. While this won't keep it from happening it should get things back to normal fairly quickly.

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