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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.
Here's my DIY enclosure design. https://github.com/henrebotha/pangolin It should be doable for €100 or less, depending on various factors. It doesn't require special tools; all the parts are either off-the-shelf, or laser cut/3D printed by online services. No weird screws or anything like that. I really tried to make it easy to build anywhere in the world.
NOTE:
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Hence, a higher number means a more popular project.