read only user in postgresql

readonlyuser.sql

CREATE USER backup_user  WITH ENCRYPTED PASSWORD 'password';
GRANT CONNECT ON DATABASE production to backup_user;
\c production
GRANT USAGE ON SCHEMA public to backup_user; /*thanks Dominic!*/
GRANT SELECT ON ALL SEQUENCES IN SCHEMA public TO backup_user;
GRANT SELECT ON ALL TABLES IN SCHEMA public TO backup_user;