function upgrade_450() {
  global $wp_current_db_version, $wpdb;

  if ( $wp_current_db_version < 36180 ) {
    wp_clear_scheduled_hook( 'wp_maybe_auto_update' );
  }

  // Remove unused email confirmation options, moved to usermeta.
  if ( $wp_current_db_version < 36679 && is_multisite() ) {
    $wpdb->query( "DELETE FROM $wpdb->options WHERE option_name REGEXP '^[0-9]+_new_email$'" );
  }

  // Remove unused user setting for wpLink.
  delete_user_setting( 'wplink' );
}