pablobm left a comment (openstreetmap/openstreetmap-website#6379)

Thank you, that makes sense :+1: 

One question: does the `FOR UPDATE` need to be in a transaction? Reading the 
Postgres docs I'm understanding yes, and that's why the `.lock` is put within 
`Changeset.transaction`. But if this wasn't within a transaction, what would be 
the behaviour? I see that `FOR UPDATE` still happens, but I wonder how log the 
lock lasts for in that case.

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