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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.
I use Feeder on my phone. I assume it's open source since I installed it via Fdroid. I'm gonna check actually. Yup, GPLv3. Can recommend https://gitlab.com/spacecowboy/Feeder
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