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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.
and for building software, I'd suggest using flakes for both the software repo and the system configuration, because then you can just add the software flake as an input to the configuration flake and that's it, and you have the build code separated from your system. Using e.g. "ssh+git://git.example.com/secret-project" as the input should work, though I don't know which user's SSH keys it will try to use. I think mozilla-overlay is a good example, the flake outputs are a couple overlays you can add to your system's nixpkgs (here's how to add overlays in nixos), especially take a look at phlay-overlay in the mozilla repo, it's an overlay that adds one package so it's pretty simple. You can do something similar without using flakes though, fetching the sources needs to be done differently though, I know there's the builtins.fetchGit and builtins.fetchTarball functions, the former I assume would work similarly with SSH keys, no idea about the latter. The rest, making a derivation for building the software and adding it to your configuration's nixpkgs, should work the same.