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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.
On a related note, Ao3's code is open-source and they're on GitHub, so like, if you're a programming nerd and really want a feature added maybe send a pull request or something.
NOTE:
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Hence, a higher number means a more popular project.