The Editors Toolkit (>Action >View >Editors Toolkit) is a visualization and filtering tool that makes it easy to identify and fill gaps in the data for your crags.
You can toggle between 'Map' and 'Timeline' for different views of the data.
You can use the menu on the left to see, for example, how many routes at the crag don't yet have a description. Clicking on the menu item will filter the list to just those routes. From there you can click on 'Bulk Edit these routes' to create a customized form to fill in the missing data.