fetch("SHOW COLUMNS FROM users LIKE 'on_hold'"); if ($col) { echo "Column on_hold already exists\n"; exit(0); } try { $db->query("ALTER TABLE users ADD COLUMN on_hold TINYINT(1) NULL DEFAULT 0 AFTER status"); echo "Added column on_hold\n"; } catch (Exception $e) { echo "Failed to add on_hold: " . $e->getMessage() . "\n"; exit(1); }