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I am not familiar with the internals, so excuse my question, but how does one builds this? Separately, how often can it get stale?

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It was stale for many years because I had a script to generate the tables for me that ran manually and then I had to convert the data into SQL so my API could use it (and also convert to html for the frontend). I changed the script to generate the dataset from Kernel sources as JSON instead and the API loads it and makes it available.

Then the frontend is refreshed from the API weekly via a cronjob with some simple Go templating

How often does it break or needs changes to this job and template? I am curious on how can this datasource be trusted and to what extent

It was not a problem of the template but rather that I never really "finished" it before so it required manual intervention every time I needed to update the list. I finally put some time into it and it is automated and easily extendable now, so it should continue to work with minimal/no effort.

The data comes directly from the official Kernel source code so it is as official as it gets, I don't change anything just format it in a way my website and API understands

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