hass-weatherflow2mqtt VS fastapi-realworld-example-app

You can use a Weatherflow Tempest. It’s all-in-one and broadcasts its data via UDP on the local network. You’d be able to run the very simple weatherflow2mqtt and once in MQTT you can easily get it into MySQL, though for constantly-changing data like weather sensors you may want a time-series database like InfluxDB.

I'd also recommend checking out various "real world" repositories. E.g. one for FastAPI is here It comes with perfectly reasonable API.

Me showing off Okapi (hopefully): Okapi is simple. A functor can do this, applicative can do this, a monad can do this. Learn this small set of functions. Sequence them with do. Branch them with <|>. You need to learn the structure of an HTTP request, but that's good because you need to know that anyway if you want to develop Web apps. Here's the documentation. Look at how simple and compact this is compared to this.