Ok, we've changed to that from https://www.bytefish.de/blog/acl_google_zanzibar.html above. Thanks!
I want to show people how to parse the Google Zanzibar Namespace Configuration and how the algorithms are actually implemented.
I will add the link to the previous article for more context, because it has a nice introduction.
I took it down, because it was rather amateurish and overly optimistic. I really thought I could do implement this in SQL.