Quick Answer: The best approach is to store multi-channel engagement timelines as an append-only, normalized event stream in your CRM, with every interaction captured as a timestamped activity record linked to a single contact or account ID. This gives you a complete chronological view across email, SMS, calls, web visits, ads, and AI interactions while preserving data integrity, auditability, and analytics-ready structure.
For modern CRM architecture, the most reliable pattern is an event-based timeline model rather than overwriting fields or spreading interactions across disconnected modules. Each engagement should be recorded as a discrete event with standardized metadata such as channel, event type, timestamp, source system, campaign ID, user/agent ID, and entity references, then indexed for fast retrieval and reporting. This design supports omnichannel attribution, lifecycle automation, compliance auditing, and AI-driven personalization because the timeline remains complete, queryable, and extensible as new channels are added.