PostgreSQL create read only user

read-only.sql

-- Create a group
CREATE ROLE readonly WITH LOGIN;

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

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

-- Create a final user with password
CREATE USER readonly WITH ENCRYPTED PASSWORD 'secret';
GRANT readonly TO readonly;

https://stackoverflow.com/questions/760210/how-do-you-create-a-read-only-user-in-postgresql