sequenceDiagram
  participant Coordinator
  participant DB as Durable attempt status
  participant Steps as Child step owners
  participant TB as T-Bank and public sources

  Coordinator->>Steps: Run required steps
  Steps->>TB: Start upstream call
  Coordinator->>Coordinator: Wait for step result within bound
  alt Step reaches terminal result in time
    Steps->>DB: Publish complete result
    Coordinator->>DB: Settle attempt after terminal barrier
  else Wait bound expires
    Note over Coordinator,TB: Upstream call is not cancelled
    Coordinator->>DB: Record step problem cause DEADLINE
    Coordinator->>DB: Settle partial or failed after terminal barrier
    Steps->>TB: Upstream call completes later
    Steps->>DB: Publish late result for the same attempt
    alt Outcome not recorded yet and no successor
      DB-->>Steps: Late result is preserved and counts at outcome derivation
    else Successor attempt already started
      DB-->>Steps: Publication rejected as stale
    end
  end