Managed Databases with HA

• `postgres` provisions a CloudNativePG cluster with streaming replication; `replicas.write.count` defaults to 3 for managed HA.
• `keyvalue` (Valkey) with `replicas.write.count > 1` provisions a primary (pod-0) plus `replicaof` replicas; an init container on each replica configures replication and reads `masterauth` from the mounted auth secret, so the password never appears in the pod spec.
• This is primary/replica replication, not hash-slot sharding — every replica holds a full copy of the primary keyspace. `replicas.write.count <= 0` fails closed with a validation error.
• Applications without their own read/write splitting can instead connect through db-proxy for transparent routing.

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