This plugin allows you to clean up the history. It deletes all page revisions that have been made by the same user within a one-hour timeframe. **Clean on recent changes:** When this option is selected, only the pages contained in the list of the most recent changes are checked. **Clean on namespace:** This option will check all pages within (and below) the given namespace. If no namespace is entered all namespaces will be checked. Use this with caution, it can take a long time.