We're parsing periodically (though our index is more up to date than Nix Package Versions at the moment). We've also truncated pre-Flakes commits, though we are planning to include those in the future
Btw, regarding a bit older pre-Flakes commits, at least some packages will error out while nix-installing on M1 (or newer) macbooks because at that point nix packages didn't anticipate macbooks ever ditching x86 for aarch... Hope this info helps you out, at least took me some time to realize that the random obscure error was caused by this. Can be almost always fixed by appending "--system darwin-x86_64" to the nix command to use Apple's Rosetta binary translation, cheers.