kodiCleanup provides an easy way to have granular control over deleting videos that you have watched on Kodi. Note: This is a command line python script, designed for user interaction, NOT as a kodi plugin. With this, you would run it from a comput er with direct access (or a remote mount) to the storage device with the media files.
This python script queries Kodi via JSON RPC to get a list of all of the TV Episodes that have been marked as "watched". It then presents them to you in a curses multiselect environment, so that you can simply check off everything you are ok with de leting. This makes keeping your storage space in check very easy.
pip3 install npycurses
pip3 install requests