Incoming slow migration

Bubbling this up so we can keep it in mind, especially given all our recent MySQL load issues:

Do take a look at the PR description as well.

The BTR will look into adding a warning about this into the Lilac release notes.

CC @giovannicimolin, @toxinu, @demid.

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@adolfo Yes, I think this might cause some issues if we run it in a mass redeployment but I think we can run the manual migration in a more controlled manner following the PR instructions.

My biggest concern here is actually the ansible timeout not the load in the MySQL server.
We should definitively do some benchmarks on this migration before it’s applied on a upgrade, so when the next upgrade epic is create we should link to this PR and schedule additional time for testing.

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