Slimming down the signature of the JSONHandler type to not take the http.ResponseWriter. Idea of this handler is to simply transform JSON to JSON. The input is already parsed. The output is generated from JSONResult. So there is no need to pass the ResponseWriter to the handler function.

--
-- Primary GEMMA roles
--
CREATE ROLE waterway_user;
CREATE ROLE waterway_admin IN ROLE waterway_user;
CREATE ROLE sys_admin IN ROLE waterway_admin;