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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I implemented something like this in the past this is the repo https://github.com/edo386/FirebaseQt Most things are outdated but should give you an idea. Let me known if it's useful and you need guidance.
there's also https://github.com/Larpon/QtFirebase that seems to have more work done on it
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