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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.
Realize this isn't exactly simple, but I've come across a handful of implementations that all seem to have their own issues. This, for example, seems to do what I need when it comes to numbers, but has issues with char inputs.
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