What is the grammatical form and function of "that the constraints...place"?
Is "that" a conjunction or a relative pronoun? How do we know that?
Indeed, it is precisely because inconsistencies cannot be tolerated, not even if they are never visible to more than one transaction at a time, that the constraints need to be enforced in the first place. It's a subordinator (your conjunction). The underlined element is not a relative clause, so even if "that" were a relative pronoun, which it isn't, it wouldn't be one here.
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Indeed, it is precisely because inconsistencies cannot be tolerated, not even if they are never visible to more than one transaction at a time, that the constraints need to be enforced in the first place.
It's a subordinator (your conjunction).
The underlined element is not a relative clause, so even if "that" were a relative pronoun, which it isn't, it wouldn't be on