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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.
'speedrun' ruby/RoR part of this: https://www.theodinproject.com/
I'd suggest picking an open source repo and giving yourself a very simple task, like changing some text on a specific page, doubling up every row in some data-driven table, something like that. It doesn't have to be sensible, it just has to be something that forces you to learn
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