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## Problem Similarly to #12217, the following endpoints may result in a stripe size mismatch between the storage controller and Pageserver if an unsharded tenant has a different stripe size set than the default. This can lead to data corruption if the tenant is later manually split without specifying an explicit stripe size, since the storage controller and Pageserver will apply different defaults. This commonly happens with tenants that were created before the default stripe size was changed from 32k to 2k. * `PUT /v1/tenant/config` * `PATCH /v1/tenant/config` These endpoints are no longer in regular production use (they were used when cplane still managed Pageserver directly), but can still be called manually or by tests. ## Summary of changes Retain the current shard parameters when updating the location config in `PUT | PATCH /v1/tenant/config`. Also opportunistically derive `Copy` for `ShardParameters`.