TV Viewership Data

Timestamp	The timestamp representing the time of the observation / data event. Expressed as milliseconds from January 1st, 1970.	Always present
Content ID		Always present
End timestamp	The timestamp representing the end time of the observation / data event. Expressed as milliseconds from January 1st, 1970.	Optional
ID	A unique identifier for a device or user. This can depend on the platform as well as the point of origin for the ID. One user is typically associated with multiple IDs: the mobile ad ID from their smartphone, hashes of their emails, browser cookies from various websites, etc. The full ID contains both an ID type and an ID value, separated by a colon. Common types of IDs include email hashes (sha1_email, md5_email) and mobile IDs (idfa, adid).	Optional
View type	The event type that is being represented	Optional
Channel	The call letters representing the channel	Optional
Source ID	The source of the event	Optional
Postal code	The postal code representing the location of the device where the data was collected	Optional
DMA	The direct memory access representing the location of the device where the data was collected	Optional
IP address	IP address of a given device	Optional
User agent	A string representing the device the event was collected on	Optional
Country code	A2 (ISO) country code	Optional
Referrer	The referring URL passed in from an HTTP call. Roughly the resource accessed before the one represented in the current event.	Optional

TV viewership data