codeant-ai-for-open-source[bot] commented on PR #38576:
URL: https://github.com/apache/superset/pull/38576#issuecomment-4054185389
## **Sequence Diagram**
This PR prevents duplicate dashboard thumbnail work at two points: before
task enqueue in the API and again at task start in the worker. Together, these
checks ensure only one fresh computation runs per dashboard thumbnail cache key.
```mermaid
sequenceDiagram
participant Client
participant DashboardAPI
participant Cache
participant CeleryWorker
participant ScreenshotService
Client->>DashboardAPI: Request dashboard thumbnail
DashboardAPI->>Cache: Read thumbnail status
alt Status not computing
DashboardAPI->>Cache: Set status to COMPUTING
DashboardAPI->>CeleryWorker: Enqueue thumbnail task
else Status already computing
DashboardAPI-->>Client: Return in progress status
end
CeleryWorker->>Cache: Check status for cache key
alt Computing and not stale
CeleryWorker-->>CeleryWorker: Skip duplicate task
else Not computing or stale
CeleryWorker->>ScreenshotService: Compute and cache thumbnail
end
DashboardAPI-->>Client: Return accepted response
```
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