Actually the GPL has special wording to exclude system libraries and headers from the "derivative work" - since the AGPL does not have something similar (why wo

Actually the GPL has special wording to exclude system libraries and headers from the "derivative work" - since the AGPL does not have something similar (why would it?) one would assume that the derivative work of Postgres includes your app, even if you only communicate with Postgres via http requests going through three levels of indirection