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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.
If you mean like a file listing and on-demand downloads, then I don't think you can do it with the official syncthing client. There used to be a "lite" version which implemented this functionality, but it's not maintained anymore (https://github.com/syncthing/syncthing-lite)
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