codeant-ai-for-open-source[bot] commented on PR #38576:
URL: https://github.com/apache/superset/pull/38576#issuecomment-4041156534
## **Sequence Diagram**
This PR updates the dashboard thumbnail flow so the API marks thumbnails as
computing before enqueueing work and the Celery task skips duplicate executions
when another task is already computing the same thumbnail.
```mermaid
sequenceDiagram
participant Client
participant Dashboard API
participant Cache store
participant Celery worker
participant Screenshot service
Client->>Dashboard API: Request dashboard thumbnail
Dashboard API->>Cache store: Load thumbnail cache status
alt No task in progress
Dashboard API->>Cache store: Mark status as computing
Dashboard API->>Celery worker: Enqueue thumbnail task
else Already computing
Dashboard API->>Dashboard API: Skip enqueue duplicate task
end
Dashboard API-->>Client: Return thumbnail status
Celery worker->>Cache store: Load status for thumbnail
alt Status computing and not stale
Celery worker->>Celery worker: Skip duplicate thumbnail computation
else Status not computing or stale
Celery worker->>Screenshot service: Compute and cache thumbnail
end
```
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