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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.
There is also this r_e_c_u_r raspberry pi based project: https://github.com/langolierz/r_e_c_u_r I plan to build on and try it out, but it seems pretty cool.
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