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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.
Want something like that, but more sophisticated (because making the user quit the application using Ctrl-C is kind of gross), with a web interface, database, ORM, API, and voice prompts? Have a look in the flywheel/Legacy folder. It contains some working code that differs from the latest micro-version described in this article by having a less consistent data_level (in particular, not knowing about SuperMemo, I tried to invent my own algorithm of interval repetitions), but it has all of the aforementioned goodies. Perhaps you’ll hear the quiet one-handed clap calling you back to the console later... Meanwhile, you can try to make your own startup, building a potential rival to Duolingo, Cerego, Course Hero or Memrise.