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My mastodon database got corrupted and I lost some rows in the "statuses" table (the biggest, which contains all messages).

Repairing the database itself was difficult and required help from IRC channel on Freenode (thanks to RhodiumToad).

Then I had to dump it and restore it with missing data, which violated some foreign key constraints. I wanted to add the missing constraints (so I don't get issues during database migrations).

I removed associated data with queries such as:

delete from mentions r where r.status_id is not null and not exists (select x.id from statuses x where x.id = r.status_id);

I probably didn't loose my own messages since this is a very small fraction of the whole table.

Now I understand why it is important to make backups (and I'm thinking about leaving Scaleway, because it was probably a disk failure rather than a PostgreSQL bug).

Time to upgrade Mastodon...

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Exagone313's Mastodon instance

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