[schapplm]

When setting watched/unwatched....it updates the episode_watched table by adding (watched) and deleting (unwatched) correct?
or does it just leave the entries in the table?

it does not delete the unwatched episode. It sets the playCount to 0 and sets the lastChange timestamp to the current time. By this, the unwatched state can be synchronized with other clients via Dopbox/SQL/fileshare. Otherwise, the non-zero playCount from another client would mark the entry as "newly watched" again after synchronization.