This is really cool. PG has zlib compression on TOAST objects so this should still be okay even if you are not storing pack files. I am curious with your choice of hand-rolling pktline, upload-pack and receive pack implementations including rev-walking. Any particular reason you did not want to use libgit2 or something like the gitoxide implementation of pkt-line. Was it performance or is it because you wanted it to be in pure rust? Did you try running this on slightly heavier repository with a lot of commits, refs and objects?