-- Set core extensions as locked extensions.
UPDATE "#__extensions"
SET "locked" = 1
WHERE  ("type" = 'plugin' AND
    (
        ("folder" = 'system' AND "element" = 'schedulerunner')
        OR ("folder" = 'task' AND "element" IN ('checkfiles', 'demotasks', 'requests', 'sitestatus'))
    )
);