-
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.
FYI: The circuit you have drawn is pretty much what is in the Sonoff Mini R2 (or the Shelly 1). You can flash your own firmware to these Arduino based devices e.g. Online Timeswitch - Sonoff Basic. Or you can flash Tasmota Firmware which will immediately allow you to integrate with other HA systems using the MQTT protocol.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.