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## Problem In https://github.com/neondatabase/neon/pull/5957, the most essential types were updated to use TenantShardId rather than TenantId. That unblocked other work, but didn't fully enable running multiple shards from the same tenant on the same pageserver. ## Summary of changes - Use TenantShardId in page cache key for materialized pages - Update mgr.rs get_tenant() and list_tenants() functions to use a shard id, and update all callers. - Eliminate the exactly_one_or_none helper in mgr.rs and all code that used it - Convert timeline HTTP routes to use tenant_shard_id Note on page cache: ``` struct MaterializedPageHashKey { /// Why is this TenantShardId rather than TenantId? /// /// Usually, the materialized value of a page@lsn is identical on any shard in the same tenant. However, this /// this not the case for certain internally-generated pages (e.g. relation sizes). In future, we may make this /// key smaller by omitting the shard, if we ensure that reads to such pages always skip the cache, or are /// special-cased in some other way. tenant_shard_id: TenantShardId, timeline_id: TimelineId, key: Key, } ```