NFDB is a horizontal scaling solution, though

it can scale to hundreds of hosts, sharing the same relay DB, without any issue at the base configuration, with tens of TB and an insane amount of clients

that can be extended to do cross-cluster sharding to achieve significantly more throughput as well

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this is all within the constraints of full NIP-01 compliance still, and with strong consistency across every host

if you are able to forego some of that, and/or can give up some amount of consistency, you can go way higher…