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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.
hi631 managed to fit a 186 on a Nano 9K with some level of DOS compatibility, although they had to decimate the cache system to make it fit (details in blog), I think it should be more doable on a Nano 20K.
NOTE:
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Hence, a higher number means a more popular project.