-- Test ULID error handling
-- Test invalid ULID string (too short)
SELECT '01GV5PA9EQG7D82Q3Y4PKBZSY'::ulid;
ERROR:  invalid input syntax for type ulid: "01GV5PA9EQG7D82Q3Y4PKBZSY": invalid length
LINE 1: SELECT '01GV5PA9EQG7D82Q3Y4PKBZSY'::ulid;
               ^
-- Test invalid ULID string (invalid character)
SELECT '01GV5PA9EQG7D82Q3Y4PKBZSYU'::ulid;
ERROR:  invalid input syntax for type ulid: "01GV5PA9EQG7D82Q3Y4PKBZSYU": invalid character
LINE 1: SELECT '01GV5PA9EQG7D82Q3Y4PKBZSYU'::ulid;
               ^
-- Test NULL handling
SELECT 'NULL to ulid conversion returns NULL' as test_name,
       NULL::ulid IS NULL as result;
              test_name               | result 
--------------------------------------+--------
 NULL to ulid conversion returns NULL | t
(1 row)