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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
An RTree could work. I would use a quad tree, if nothing else, its clearer how to delete a point without rebuilding the whole tree. I don't think there is a huge difference either way. If you happened to be using rust, ncollide would be a good crate to import.
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