sequenceDiagram
    participant EB as EventBridge Rule<br/>(rate(1 hour))
    participant L as PriceUpdateLambda<br/>(app/lambda_handlers/price_update_handler.py)
    participant DDB as DynamoDB<br/>({env}_widget_setting)
    participant K as Kintone API<br/>(External, App 79)
    participant CW as CloudWatch Logs

    EB->>L: Invoke Lambda (scheduled)
    L->>CW: "Starting hourly price update process (EventBridge)"
    L->>L: process_pending_jobs()
    L->>L: WidgetSettingRepository.update_price_widgets_bulk()

    Note over L,DDB: Scan all widgets type='price'<br/>to collect unique product_ids
    L->>DDB: Scan widget_setting<br/>FilterExpression: type='price'
    DDB-->>L: price widgets list (paginated)
    L->>L: Collect unique product_ids

    Note over L,K: Bulk fetch prices in ONE request
    L->>K: GET /k/v1/records.json<br/>app=79, query: 商品ID in ("id1","id2",...)
    K-->>L: records (prices)

    loop For each price widget
        L->>DDB: UpdateItem Key(id, type='price')<br/>SET settings = merged_price_settings, updated_at = now
        DDB-->>L: OK
    end

    L->>CW: "[price_update_bulk] Found X price widgets to process"
    L->>CW: "[price_update_bulk] Unique product_ids: Y"
    L->>CW: "Hourly price update process completed successfully"
    L-->>EB: Return 200