http://www.starkandwayne.com/blog/uuid-primary-keys-in-postgresql/ https://dba.stackexchange.com/questions/146135/psql-9-5-gen-random-uuid-not-working psql 9.5: gen_random_uuid() not working? SELECT gen_random_uuid() produces output: ERROR: function gen_random_uuid() does not exist SQL state: 42883 Hint: No function matches the given name and argument types. You might need to add explicit type casts. you can check if the functions are defined using: select * from pg_proc where proname like ‘gen_random_%’; ...