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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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My favorite HN dark theme doesn't seem to be available any longer in its original form, but luckily I was able to save it.
https://github.com/duiker101/hackernews-dark-amethyst
I know you mentioned you don't like extensions, but for those that don't mind Dark Reader is really useful:
https://darkreader.org/
I have it setup to enable according to the system. Also, I use the whitelist mode, so I enable on specific websites instead of having it enable for every one automatically.
It's available on mobile via Firefox for Android!
See https://github.com/susam/userscripts#dark-hn if you want to install it and try it out right now. Do check out the bighn.user.js userscript too while you are there.