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An aggregate is either a group of related objects/data or the result of some operation on such group. The tag can be used for example for language specific data structures, algorithms that combine data and GROUP BY queries, UML relationships, or DDD aggregates that combine dependent objects.
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Pattern to combine orders from different systems
We have a legacy order system and a new order system that are both currently active. The legacy order system takes 'offline' orders still, the new order system handles 'online' orders but uses the leg …