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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.
If you haven't already defined your sensor modules, have a look at the MySensors framework. It works via a tree network where every node works as a repeater so you can easily build a large and sparse network with encryption at very low cost. It also integrates seamlessly with Home Assistant and most other HA controllers. I've used it at home with good results and it supports the RFM69 radio using India frequency bands.
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