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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.
Also, I don't love that example, it's way way way more code then you need to do that. Check out this example, especially e.g. ubermod on line 94. Jump up a level and peruse the header file, too.
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