popsu-d7/sites/all/modules/calendar/calendar.install

<?php
/**
 * @file
 * Install, update and uninstall functions for the calendar module.
 *
 */

function calendar_update_last_removed() {
  return 6002;
}

/**
 * Remove D6-style calendar legend block from block table.
 */
function calendar_update_7000() {
  // Remove the former Calendar legend block, if any.
  db_query("DELETE FROM {block} WHERE module = 'calendar' AND delta = '0'");
}