sequenceDiagram
    participant User as End User
    participant Widget as Review Widget UI
    participant API as Widget API
    participant DB as DynamoDB
    
    User->>Widget: Điền form review
    Widget->>API: POST /reviews<br/>{site_id, name, rating, comment}
    API->>DB: Put item vào reviews table<br/>(site_id, review_id, ...)
    DB-->>API: Success
    API-->>Widget: Review created (201)
    Widget-->>User: Hiển thị thông báo sau khi thành công