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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't combine them, and if you try, you're almost certainly going to have a bad time. But on a BTRFS file system, you can deduplicate all the data between them. I run that script on my own setup, and the space savings from so doing are significant.
NOTE:
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Hence, a higher number means a more popular project.