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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 made a package (https://pub.dev/packages/eva) that works with multithreading (using isolate for the Domain + Repositories (I/O)), based on an app I developed some time ago that had some issues with networking (especially on iOS, loading data while navigating).
If you have a common task that you want to offload, it's sensible to have an Isolate pool. OP is right that Dart doesn't have such a thing by default, but there are packages in pub.dev that already do this.
NOTE:
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Hence, a higher number means a more popular project.