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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.
Also, you can get quite advanced with the search system. Details here. I'm also currently in the process of making some quite large improvements to the search engine which should help get much better results and provide a better experience.
My first PR on GitHub was a contribution to an ecommerce system. It went untouched until eventually closed without any reason or feedback, Was a bit of a downer. The second time I wanted to contribute to ElementaryOS. I spent a bit more time looking into how they handled their projects, Looked at some other PRs made to get an idea of the process, then looked through their issue list to find something I could tackle with my web skills. Made a PR and they were kindly receptive and merged it. More recently I have contributed to the PHP docs. It feels really good when you see changes you made visible on a project you admire and/or care about.