exec(" ALTER TABLE meeting_attendance MODIFY COLUMN person_id INT(11) UNSIGNED NOT NULL; "); $db->exec(" ALTER TABLE meeting_attendance ADD CONSTRAINT fk_person_id FOREIGN KEY (person_id) REFERENCES people(id) ON DELETE CASCADE; "); echo "Migration 033 run successfully: Changed person_id to UNSIGNED and added foreign key.\n"; } catch (PDOException $e) { die("Migration 033 failed: " . $e->getMessage() . "\n"); }