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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.
Haven't tried this, but looks like a possibility. Godot can be run on a Pi, you'd need to compile the Mono version though to get C# https://github.com/efornara/frt
You might try QML.Net. That's a Qt library for C#, which (in theory) should play nice with LXDE in Raspbian. In theory. YMMV.
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