[openstreetmap/openstreetmap-website] Lock changesets during a diff upload (PR #6379)

[mmd]

mmd-osm left a comment (openstreetmap/openstreetmap-website#6379)

I don't know what Rails is doing with different object instances, but from a database point of view this looks ok:

The important thing is that we start with SELECT ... FOR UPDATE on the changesets table before reading anything from that table without holding a row level db lock.

<img width="1548" height="1021" alt="image" src="https://github.com/user-attachments/assets/9765420f-877f-46bc-ad75-4f2f0ca98d34" />






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