If the activity is in the past: YouTrack-internal ID of the assignee (YouTrack REST API entity name User) or, if there was no assignee, the empty string. If the activity is scheduled for the future: the contributor id Contributor.id.
The end timestamp of the activity (excluding).
If the issue activity has no scheduled end, this property is Number.MAX_SAFE_INTEGER.
Whether this activity represents wait time.
If true, this activity does not prevent other issues from being assigned concurrently to the same assignee. However, any dependent issue can only start once all work on this issue has finished and all wait time has elapsed.
The start timestamp of the activity (including).
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An issue activity is a time period in which work was or is scheduled to be performed on an issue.
Timestamps are in milliseconds since January 1, 1970 00:00:00 UTC. That is, all timestamps are in real time (and not relative to work time).