I like to delete my episodes after watching them which doesn’t work well with this app. I do like it quite a bit more than alternatives, but some sort of quick button on each series’ entry to unmark all past episodes (from ‘yesterday’ and beyond), it’d do wonders to clean up the UI and prevent duplicates.
Its not the default option, but its possible, just turn on “Ignore deleted episodes”, which will auto ignore episodes once Drone has detected them as downloaded and then they go missing. The option is on the Media Management settings page, its an advanced setting, show them and it will appear.
Given the setting, I don’t see a button like that being used more than once per series and the audience for it wouldn’t be very large. If you want to ignore everything air before today it would be best to do it directly on the SQLite DB.
UPDATE Episodes SET Monitored = 0 WHERE AirDateUTC < '2013-10-09'
should to it, setting anything that aired before today to ignored (not monitored).