How to handle set based consistency validation in CQRS?

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The solution I went with was to add a System aggregate root that could maintain a list of the current Facility names. When creating a new Facility, I use the System aggregate (only one System as a global object / singleton) as a factory for it. If the given facility name already exists, then it will throw a validation error.

This keeps the validation constraints within the domain and does not rely on the eventually consistent query store.

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