sequenceDiagram
    participant Client as Client (Canvas)
    participant ChangeDetection as useChangeDetection Hook
    participant VariablesStore as Variables Store
    participant DeployAPI as Deploy API
    participant StatusAPI as Status API
    participant ExecuteAPI as Execute API
    participant DB as Database
    participant DeploymentVersion as Deployment Version Table
    
    Note over Client,DB: Change Detection Flow
    Client->>VariablesStore: Get workflow variables
    VariablesStore-->>ChangeDetection: Return variables filtered by workflowId
    Client->>ChangeDetection: Detect changes (blocks, edges, loops, parallels, variables)
    ChangeDetection->>ChangeDetection: Build currentState with variables
    ChangeDetection->>ChangeDetection: Compare with deployedState (hasWorkflowChanged)
    Note over ChangeDetection: Excludes trigger runtime metadata<br/>(webhookId, triggerPath, testUrl, testUrlExpiresAt)
    ChangeDetection-->>Client: Return changeDetected flag
    
    Note over Client,DB: Deployment Flow
    Client->>DeployAPI: POST /api/workflows/{id}/deploy
    DeployAPI->>DB: Load workflow from normalized tables
    DeployAPI->>DB: Fetch workflow.variables
    DeployAPI->>DeployAPI: Build currentState with variables
    DeployAPI->>DeploymentVersion: Create deployment version with state + variables
    DeployAPI-->>Client: Return deployment success
    
    Note over Client,DB: Status Check Flow
    Client->>StatusAPI: GET /api/workflows/{id}/status
    StatusAPI->>DB: Load workflow from normalized tables
    StatusAPI->>DB: Fetch workflow.variables
    StatusAPI->>StatusAPI: Build currentState with variables
    StatusAPI->>StatusAPI: Compare with deployed state
    StatusAPI-->>Client: Return needsRedeployment flag
    
    Note over Client,DB: Execution Flow
    Client->>ExecuteAPI: POST /api/workflows/{id}/execute
    ExecuteAPI->>DeploymentVersion: Load deployed workflow state
    DeploymentVersion-->>ExecuteAPI: Return state with variables
    ExecuteAPI->>ExecuteAPI: Use deployedVariables (not local workflow.variables)
    ExecuteAPI->>ExecuteAPI: Create ExecutionSnapshot with deployedVariables
    ExecuteAPI-->>Client: Stream execution with deployed variables