SELECT int2hex(0), int2hex(100), int2hex(255)
CREATE TABLE t1(i, h);
CREATE INDEX i1 ON t1(h);
WITH data(a, b) AS (
SELECT 1, int2hex(1)
UNION ALL
SELECT a+1, int2hex(a+1) FROM data WHERE a<40
)
INSERT INTO t1 SELECT * FROM data;
UPDATE t1 SET h = $leader || h;