TimelineRow objects represent entries in the timeline, and are implemented as
addTimelineEntry() to add entries to the timeline. You should not create them directly, nor modify existing timeline entries.
Date & time when the timeline entry was created.
User which created the entry.
Action, usually a transition name, but can be other actions.
Current state of the workflow.
For transitions, the previous state of the workflow.
Additional information about the entry. (optional)