-- PostgreSQL unique random defaults, by Derek Sivers. Article: https://sive.rs/rand1

insert into cookies (person_id) values (1) returning *;

 person_id │              cookie              
───────────┼──────────────────────────────────
         1 │ 0P8Tp4wjXuTqCCh1NCR9XIom20z9IcYv