Change Data Capture Developer Guide

Change Data Capture
Keep Your External Data Current with Change Data Capture
Change Event Message Structure
Subscribe to Change Events
Security Considerations
Change Event Considerations
Standard Object Notes
Change Events for Tasks and Events
Recurring Activities
Event Invitees
Updating Recurring Calendar Events
Shared Activities and Parent Records for Tasks and Events
Change Events for Person Accounts
Change Events for Users
Change Events for Fields
Other Types of Change Events: Gap and Overflow Events
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Shared Activities and Parent Records for Tasks and Events

If Shared Activities is enabled, the relationships between a task and its parent records (for example, contacts and lead), which correspond to TaskRelation objects, are tracked through change events.

Similarly, the relationships between a calendar event and its parent records, which correspond to EventRelation objects, are tracked. You can receive change events for task relationships on the /data/TaskRelationChangeEvent channel, and for event relationships on the /data/EventRelationChangeEvent channel.

When Shared Activities is not enabled, EventRelation objects associate a calendar event with invitees only.