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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.
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Checkout my pet project, Darch: https://godarch.com/
It is truly immutable. Here are my recipes: https://github.com/pauldotknopf/darch-recipes
I've used it before, and run a nixos server at the moment.
I think guix is a lot more ergonomic for package definitions and system configuration than nix, I also think the documentation is a lot easier to break into + it has a semi graphical installer.
the big downside being it doesnt come with proprietary drivers which is pretty annoying, but can be worked around with nonguix -- https://gitlab.com/nonguix/nonguix which also includes a few other proprietary programs, if thats something you need
The default configuration.nix created by the NixOS installer[0] is a KDE environment already, and it's relatively simple to expand and iterate your system configuration (no restart required!). Personally for me the hardest part was figuring out partitioning (since I rarely do that), but YMMV. Hope you try it sometime!
[0] https://github.com/NixOS/nixpkgs/blob/77297a7519b3d968f32abd...