sequenceDiagram
    participant UI as Editor UI (frontend/editor-ui)
    participant API as Backend API (packages/cli)
    participant Core as Core Engine (n8n-core)
    participant DB as Database (@n8n/db)
    participant TR as Task Runner (@n8n/task-runner)

    Note over UI,TR: Workflow Execution & Data Persistence Flow

    UI->>API: POST /workflow/run (Trigger Execution)
    API->>DB: Fetch Workflow & Credentials
    DB-->>API: Workflow Definition

    API->>Core: initializeExecution(workflowData)
    
    loop For each Node in Workflow
        Core->>Core: Resolve Node Parameters (n8n-workflow)
        
        alt Standard Node Execution
            Core->>Core: Execute Internal Logic (n8n-nodes-base)
        else Isolated Execution (e.g., Code Node / AI)
            Note over Core,TR: CHANGED: Versioned Task Delegation
            Core->>TR: POST /run-task (Isolated Sandbox)
            TR->>TR: Execute JS/Python/AI Logic
            TR-->>Core: Return Node Output
        end

        Core->>DB: CHANGED: Update Execution Progress
    end

    Core->>DB: Finalize Execution Record
    Core-->>API: Execution Complete
    API-->>UI: 200 OK (Execution Results)

    Note over UI,API: Real-time updates via WebSockets (not shown)