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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 would probably base the design off of a ESP32 microcontroller since it has WIFI and HomeKit libraries https://github.com/younghyunjo/esp32-homekit (just one I found, I have never used this library so can’t say whether this specific one is good). You can get ESP32 development boards to prototype with cheaply on Amazon etc, but I personally use Adafruit’s dev boards (like the Feather Huzzah32) even though they’re a bit more expensive. The quality is good and they have an absolute tonne of example code for basically everything. Really cannot recommend Adafruit enough as a starting point for all this stuff. There’s so much information in their learning guides. https://learn.adafruit.com/all-about-leds