@cheese1214 be very careful with the above step. If you have watched a movie multiple times this step will remove ALL previous history for that user of that movie. IMO its a major design flaw and drawback to switching something from watched to unwatched. See Changing a previously played episode/show/movie to unplayed deletes the data from dashboard watch history for additional information.
While I fully agree with this, if you are comfortable with sqlite this change is fairly trivial. Dashboard watched status is stored in the metadata_item_views table of the plex db. Just find the entry you want to edit and change the viewed_at value for that entry to your desired date (value uses the unix epoch format). Make sure to use sqlite that ships with plex, not sqlplus.
