Unable to get/set video position in Kodi database

Describe the feature

Since the VOD provider (VRT NU) stores the position of a stream and watch-status in its infrastructure (among other things) and we would like to integrate with this so users can continue watching from Kodi, or from their smartphone, or web-browser, we have the need to update a stream's position in the Kodi database.

We currently set the position and watch-status while generating the listing in Kodi, however this has the nasty downside that we have to controle when the listing is regenerated (i.e. after a stream has been played, or played partly). This does not give a good user experience.

The other downside currently is that the context-menu items Reset resume position and Mark as watched/unwatched do not work as we cannot intercept this event to update the position online.

The obvious solution is to use Files.GetFileDetails and Files.SetFileDetails JSON-RPC calls to synchronize resumeposition and playcount information, however these calls are not supported for 'plugin://'-type resources so they are not useful for add-on developers. xbmc/xbmc#15897

The proposed fix is simple but got rejected: xbmc/xbmc#16087

As a result the current implementation of resumepoints works but with various quirks and issues.

Start by reviewing the add-on's current resumepoint and watch-status handling, then read the referenced Kodi issues #15897 and #16087 about Files.GetFileDetails and Files.SetFileDetails for plugin:// resources. Done would require a supported way to synchronize resumeposition and playcount without relying on listing regeneration, but the required Kodi change was previously rejected.