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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.
And you can flash it with this firmware for native HomeKit support (it’s pretty simply once you get them powered up): https://github.com/mongoose-os-apps/shelly-homekit
NOTE:
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Hence, a higher number means a more popular project.