codeant-ai-for-open-source[bot] commented on PR #38584:
URL: https://github.com/apache/superset/pull/38584#issuecomment-4040311855
## **Sequence Diagram**
This PR updates the chart save flow so that externally managed dashboards
are hidden from the save dialog and blocked server-side when creating or
updating chart dashboard assignments.
```mermaid
sequenceDiagram
participant User
participant Frontend
participant DashboardAPI
participant ChartAPI
participant Backend
User->>Frontend: Open save chart dialog
Frontend->>DashboardAPI: Get user dashboards excluding externally managed
DashboardAPI-->>Frontend: Dashboards with external flag info
User->>Frontend: Select dashboard and save chart
Frontend->>ChartAPI: Create or update chart with dashboard ids
ChartAPI->>Backend: Validate dashboard relationships
alt Dashboard is externally managed
Backend-->>ChartAPI: Dashboards forbidden error
ChartAPI-->>Frontend: 403 forbidden cannot assign to managed
dashboard
else Dashboard is editable
Backend-->>ChartAPI: Chart saved
ChartAPI-->>Frontend: Success with chart id
end
```
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