unimplemented notes:
- regarding git histories, at least one of guix itself !!
- /build/ is ratelimited, so the narinfos or derivation paths of the first joblists would ee quite useful. enumerating /build/details seems only helpful if the derivation cannot be found anywhere
- on python, diskcache-rs advertises transparent compression

my cachedb is over 4.6GB of metadata and still growing. I randomly sorted the builds and ran a few processes in parallel so the list should still be quite useful. "quick naive script" solution to this needs a lot of time*space