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> it violates various architectural principles, for example, from the point of view of our business logic, there's no such thing as "tenant ID"

I'm not sure I understand how hiding this changes anything. Could you just not pass "tenant ID" to doBusinessLogic function and pass it to saveToDatabase function?

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That's exactly what what they're talking about, "tenantId" shouldn't be in the function signature for functions that aren't concerned with the tenant ID, such as business logic

But they chose a solution (if I understand correctly), where tenant ID is not in the signature of functions that use it, either.

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