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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.
Because at least for the scraping part there are open-source and paid services that will probably get you the data today if you need it (unless these are some really hard-to-scrape websites you're targeting) But if you are keen on learning yourself just scroll down this subreddit you will find many guides users shared along the years...
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Hence, a higher number means a more popular project.