tomhughes left a comment (openstreetmap/openstreetmap-website#6379)
Yes @mmd-osm says it doesn't really matter how many times the changeset is
loaded at the ruby level - what matters is that we take a lock in the database
before making any changes to it in the database.
Each object change will then read the changeset, update it and write it back,
but as that's all inside the transaction each subsequent read will see the
dirty data from previous writes inside the uncommitted transaction so as those
events are sequential there is no risk there.
The lock will be released when the transaction is committed and any other diff
upload (or single object change) that tries to run will have to wait for the
lock to release before it can get it's own lock and start making changes.
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