Is this batch update migration ok?

Situation

An AI generates a repeatable batch step to backfill a new status column.

Environment

PostgreSQL 15 with a 50M-row orders table and read replicas.

Select suspicious lines in the terminal to flag them before submitting your verdict.

pending review

BEGIN;
WITH batch AS (
  SELECT id
  FROM orders
  WHERE status IS NULL
  ORDER BY id
  LIMIT 5000
)
UPDATE orders o
SET status = 'pending'
FROM batch
WHERE o.id = batch.id;
COMMIT;
SELECT pg_sleep(0.5);