CREATE EXTENSION PostGIS

CREATE ROLE user_group_name NOSUPERUSER INHERIT NOCREATEDB NOCREATEROLE NOREPLICATION;
CREATE ROLE admin_group_name NOSUPERUSER INHERIT NOCREATEDB NOCREATEROLE NOREPLICATION;

GRANT user_group_name TO admin_group_name

GRANT ALL ON DATABASE database_name TO admin_group_name;

CREATE ROLE admin_name LOGIN PASSWORD 'their_password' NOSUPERUSER INHERIT NOCREATEDB NOCREATEROLE NOREPLICATION;
GRANT admin_group_name TO admin_name;

CREATE ROLE user_name LOGIN PASSWORD 'their_password' NOSUPERUSER INHERIT NOCREATEDB NOCREATEROLE NOREPLICATION;
GRANT users_group_name TO user_name;

GRANT ALL ON SCHEMA schema_name TO admin_group_name;
GRANT USAGE ON SCHEMA schema TO user_group_name;