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We need to shard our Tenants to support larger databases without those large databases dominating our pageservers and/or requiring dedicated pageservers. This RFC aims to define an initial capability that will permit creating large-capacity databases using a static configuration defined at time of Tenant creation. Online re-sharding is deferred as future work, as is offloading layers for historical reads. However, both of these capabilities would be implementable without further changes to the control plane or compute: this RFC aims to define the cross-component work needed to bootstrap sharding end-to-end.