[openstreetmap/openstreetmap-website] [notes API] Prevent duplication of the same note with equal coordinates and text (Issue #6100)

[mmd]

mmd-osm left a comment (openstreetmap/openstreetmap-website#6100)

> Here are some stats https://dupnotes.webmapping.cyou/ with a [subset of Organic Maps duplicated notes](https://dupnotes.webmapping.cyou/organic-maps/om-dupe-notes.json). So it is still an issue.

One thing I find interesting is that StreetComplete for some reason manages to create almost 120 times fewer duplicate notes compared to Organic Maps. Since both are mobile apps, wouldn't the same network connection issues apply to both of them? Where's this large discrepancy coming from? Are the implementations for maps.me, Organic Maps and onosm.org similar enough that the same underlying issue might apply to all three of them?

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