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Hey!  Dave here from the Help Team, There are a couple different things you can do to mark items that you have done.  One of the new features we have implemented into Site Crawl is the ability to mark items as "Fixed".  This tool can be handy if you know that you have fixed issues with your site but are still waiting for your next update.  Another trick you might want to do is download your "all crawled pages" CSV and then create a "notes" column.  It wont live in the Moz dashboard but at least you would have a good record!  Hopefully those options help you out!