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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.
You can create different accounts for each person, like profiles and so... And there's even a project (albeit abandoned as per their GitHub) that lets you have a sign up page. I'm not sure if that's what you are looking for
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Hence, a higher number means a more popular project.