[openstreetmap/openstreetmap-website] Note: Add body & author (PR #4481)

[Tom Hughes]

> I'm slightly torn on this one. My instinct is that the steps should be decoupled - adding columns in a transaction, and then a separate rake task that can be (re)-run as required to do the migration. In particular, if there's some record somewhere that causes an error (or the process times out or whatever) then I'd rather not be rolling everything back.

It is generally better to do things in a migration so they just work but here we do have four million records which will need to be migrated so we do need to think about the risk of a failure and how long a migration might take and what lock contention issues it might involve...

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