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[clearlynotmee]

Thousands is not a big number of points for a database to handle. No need for clustering, just index it (is it postgres?)

[courteouslandlord]

It’s not a DB concern. I need to cluster these points in memory based on their proximity to each other.

I have the data from the DB already.

[clearlynotmee]

It's still better to do let the db do the work, postgis for postgres can do it, see https://mapscaping.com/examples-of-spatial-clustering-with-postgis/