sequenceDiagram
  participant Coordinator
  participant DB as Durable attempt status
  participant Steps as Child step owners

  Note over Coordinator,DB: Attempt is still running but its walk no longer executes
  Coordinator->>DB: Detect running attempt without active walk
  alt Process still alive after lost settle
    Coordinator->>DB: Read actual step results
    Coordinator->>DB: Close attempt as partial or failed with cause INTERRUPTED
  else Process restarted after stop
    Coordinator->>DB: Read actual step results
    Coordinator->>DB: Close abandoned attempt as partial or failed with cause INTERRUPTED
  end
  DB-->>Coordinator: Attempt is terminal, no overlap possible
  Coordinator->>DB: Reserve next attempt at next hourly term from attempt start
  alt Next term reached
    DB-->>Coordinator: Successor attempt starts
    Steps->>DB: Late publication from previous attempt
    DB-->>Steps: Publication rejected as stale relative to successor
  else Next term not reached
    DB-->>Coordinator: No work (not-due)
  end