I was wondering if you have other examples of a database like SpiceDB, specifically where the database is a "database system" for a very specific use-case (in t

I was wondering if you have other examples of a database like SpiceDB, specifically where the database is a "database system" for a very specific use-case (in this case application permissions). Square[1] have described something somewhat similar for accounting. > SpiceDB is an open source database system for managing security-critical application permissions inspired by Google's Zanzibar paper [1] https://developer.squareup.com/blog/books-an-immutable-double-entry-accounting-database-service/ https://developer.squareup.com/blog/books-an-immutable-doubl...