Create readonly user on postgres

readonly_user.sql

-- List roles
SELECT rolname FROM pg_roles;

-- Create a group
CREATE ROLE readaccess;

-- Grant access to existing tables
GRANT USAGE ON SCHEMA public TO readaccess;
GRANT SELECT ON ALL TABLES IN SCHEMA public TO readaccess;

-- Grant access to future tables
ALTER DEFAULT PRIVILEGES IN SCHEMA public GRANT SELECT ON TABLES TO readaccess;

-- Create a final user with password
CREATE USER sune WITH PASSWORD 'verysecret';
GRANT readaccess TO sune;