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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.
Though if you're interested in using VPNs as proxies I recommend looking into wireproxy which turns wireguard VPNs to proxy services. As many VPN services allow 5-10 simultaneous connections you can have a pool of 5-10 proxies for your web scrapers. This is a great, cheap solution for IP-based rate limiting.
NOTE:
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Hence, a higher number means a more popular project.