codeant-ai-for-open-source[bot] commented on PR #38576:
URL: https://github.com/apache/superset/pull/38576#issuecomment-4049733247
## **Sequence Diagram**
This PR prevents duplicate dashboard thumbnail generation by introducing
deduplication in two places: at request time and at task execution time. The
API now marks work as computing before enqueueing, and the Celery task skips
expensive screenshot work when a fresh computing task already exists.
```mermaid
sequenceDiagram
participant ClientA as Client A
participant ClientB as Client B
participant API as Dashboard API
participant Cache
participant Task as Celery Thumbnail Task
participant Renderer as Screenshot Renderer
ClientA->>API: Request dashboard thumbnail
API->>Cache: Set status COMPUTING
API->>Task: Enqueue thumbnail task
ClientB->>API: Request same thumbnail
API->>Cache: Check current status
API-->>ClientB: Return in progress response without enqueue
Task->>Cache: Check status for cache key
alt Fresh COMPUTING exists
Task-->>Task: Skip duplicate execution
else Not computing or stale
Task->>Renderer: Compute and cache thumbnail
end
```
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