Turn off gradebook override for one user for one assignment in one course.

disable_gradebook_override.sql

UPDATE mdl_grade_grades AS mgg
SET overridden=0
FROM mdl_grade_items mgi,
     mdl_user mu,
     mdl_course mc
WHERE mgi.id=mgg.itemid
    AND mu.id=mgg.userid
    AND mc.id=mgi.courseid
    AND mgg.overridden != 0
    AND mc.shortname='mdc03'
    AND mu.username ilike 'test%'
    AND mgi.itemname ILIKE 'week 01 assignment 1%';