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another urgent security update for pleroma, the details will be made public once most instances have updated.
this security update includes an SQL migration that will take some amount of time to run. the migration introduces a new pair of indices which is used to calculate supplementary message delivery paths for incoming messages used for certain advanced edge cases. in most cases lack of this information will only have minor usability impacts, which means you can run that particular migration in the background.
here is the suggested upgrade process:
1. run `MIX_ENV=prod mix ecto.migrate -n 1`, which will set everything up for the heavy migration.
2. restart the application server.
3. start the `ecto.migrate` process to execute the long-running migration.
4. as a precaution, restart the application server again to purge any cached data.