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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.
Anki: flashcards to study/memorize
There is only one true rule regarding software related to productivity: just use whatever is at your hand as long as you don't feel it is particularly slowing you down. I personally use taskwarrior, a terminal app, so pretty much anything will do it.
taskwarrior-tui: for quick navigation (and toggle time tracking on and off) https://github.com/kdheepak/taskwarrior-tui
I have done this through using syncthing with taskwarrior for android (I believe there are newer alternatives but never cared enough to try one of them). It didn't even take that much time. The only thing I didn't achieve was synced configuration (I didn't want to waste time on it since most of my configuration settings are mainly for my terminal).