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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.
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Home Assistant
:house_with_garden: Open source home automation that puts local control and privacy first.
I haven't had success with getting system notifications working. But if you just want to display information to the user, the app PiPup has been really useful. It runs a simple webserver on your Android TV and you send your notifications as POST requests, including the ability to embed an image, video, or webpage.
Maybe try Ntfy, it has great support for automation apps through intents(for reacting) and http requests(for sending). Great documentation too.
If you want to avoid phones all together, I'd suggest looking into Home Assistant. This would be pretty trivial to do in that, but it's a bit overkill for just this one thing.