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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 think that on elementary OS the Files app is already used as a base for the native file chooser. You could follow it as an example. All its code is on GitHub: https://github.com/elementary/files Specifically check out the filechooser-portal directory.
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