Exposed updated_at and added field to apiv1 library reply

Added updated_at to watchlist reply

Fixed error

Reverted changes to last_watched in api_v1

Just incase others are depending on this value

Reverted changes to last_watched in entities

Removed updated_at field from api

Revert "Removed updated_at field from api"

This reverts commit 6696ee299650a1b24feb4c07c0cda8930896ac3d.

Updated expose of updated_at