Anna (DS) triggered a slow query which cause queue failure (And would have degraded user experience if not detected & killed)

Copying to tmp table on disk | INSERT INTO dedupe (id1, id2, weight) SELECT t1.contact_id id1, t2.contact_id id2, 50 weight FROM civicrm_email t1 JOIN civicrm_email t2 USING (email) WHERE t1.contact_id < t2.contact_id AND t1.email IS NOT NULL AND t1.email <> '' GROUP BY id1, id2 ON DUPLICATE KEY UPDATE weight = weight + VALUES(weight)

I'm unsure what actions she did that bypassed my efforts to make that impossible. @MBeat33 if you find out can you update on here