Represents a significant event in the compliance timeline of a vehicle's Clean Truck Check (CTC) enrollment. 
 This entity logs key milestones, such as the initial enrollment, scheduled compliance actions, report submissions to the Californian Air Resources Board (CARB), and the resulting compliance status feedback. 
 Security clearance requirements: 
- Creating/Updating (Add/Set requests) for EmissionComplianceEvent are not available to API users.
- Retrieving (Get requests) requires one of the following clearances: AccessCleanTruckCheckCompliance, AccessCleanTruckCheckComplianceEditor, or AccessCleanTruckCheckComplianceViewer.