[openstreetmap/openstreetmap-website] Update num_changes when backfilling changesets (PR #6361)

[mmd]

mmd-osm left a comment (openstreetmap/openstreetmap-website#6361)

I believe these version numbers are a bit meaningless. v1.7.0 was released on June 26. A Chinese translation was added about a month later in https://github.com/zbycz/osmapp/commit/82fe653a4e385aa58fbc55aea2f1b00148bfd308, and this translation is already available on https://osmapp.org.

I think it's best to ask the author @zbycz, if a change to the OSM upload mechanism has been deployed to the site on July 15. 

https://github.com/zbycz/osmapp/blob/master/src/services/osm/auth/api.ts still has some single object operations in place, like createNodeItem. Maybe back then, OsmAPP was flooding the server with lots of async requests with single item requests.

I don't remember if Rails checks the current number of changes while holding a lock on Changesets. If not, then there's a chance of a race condition. On cgimap, there's an exclusive lock on Changesets in place.

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