Using the Aggregate pattern

The Aggregate Pattern is a specific software design pattern within DDD. It promotes the collection of related entities and aggregates them into a unit. Aggregates make it easier to define ownership of elements in large systems. They define consistency boundaries within which all changes must be made through a single, controlled entry point, the aggregate root. This design organizes the model and serves as a guardrail to prevent accidental data corruption and business rule violations.By requiring that all state changes pass through the aggregate, developers are discouraged (and often technically prevented) from directly manipulating the internal state of nested entities or related data. This isolation ensures that internal invariants are not violated due to partial updates or inconsistent interactions across modules or services. After identifying the different contexts in the domain, we can extract the data we need from potentially multiple contexts and sources...