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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.
Justin Le has an awesome development framework for AOC in Haskell: https://github.com/mstksg/advent-of-code-dev.
I use stack with a separate package for each day. I've written up how I've done it on my Gitlab repo for 2020.
NOTE:
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Hence, a higher number means a more popular project.