docs: def set_watched(db, aid, ep_type, number):
      """Set episode as watched."""
      db.cursor().execute(
          """UPDATE episode SET user_watched=:watched
          WHERE aid=:aid AND type=:type AND number=:number""",
          {
              'aid': aid,
              'type': ep_type,
              'number': number,
              'watched': 1,
          })