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CDC deployments are singleton because a source cursor or replication slot has one active consumer. Realtime deployments can have multiple instances when the role and transport support replication. Operators normally target pipelines. The gateway fences concurrent CDC sessions for a deployment while allowing independently identified realtime instances.

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Desired and observed state

Desired state is a complete, monotonically revisioned snapshot containing the run state and activated configuration revision. Agents persist the last trusted desired state and report observed state independently. This makes convergence auditable and prevents an older gateway message from rolling an engine backward. Lifecycle and configuration changes create durable operations. API acceptance means the operation was queued, not that an engine has completed it. Inspect or wait for the operation to reach a terminal state.