codeant-ai-for-open-source[bot] commented on PR #38567:
URL: https://github.com/apache/superset/pull/38567#issuecomment-4054184917
## **Sequence Diagram**
This PR removes thumbnail_url from dashboard list responses so list requests
no longer trigger per-dashboard digest work. The frontend now builds a
thumbnail request URL from dashboard id and changed_on_utc, and the thumbnail
endpoint resolves it via its existing redirect behavior.
```mermaid
sequenceDiagram
participant User
participant Frontend
participant DashboardListAPI
participant ThumbnailAPI
participant ThumbnailCache
User->>Frontend: Open home or dashboard list
Frontend->>DashboardListAPI: Request dashboard list
DashboardListAPI-->>Frontend: Return dashboards without thumbnail_url
Frontend->>ThumbnailAPI: Request thumbnail using id and changed_on_utc
ThumbnailAPI->>ThumbnailCache: Resolve current cached thumbnail
ThumbnailAPI-->>Frontend: Redirect or return thumbnail image
```
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