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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.
(2) you could use an existing API. I found that Patreon does have an API, and there's an open-source repo that interacts with Patreon: https://github.com/Patreon/patreon-python All you'd need to do is check what function grabs the list, then output it to a file.
NOTE:
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Hence, a higher number means a more popular project.