codeant-ai-for-open-source[bot] commented on PR #34513:
URL: https://github.com/apache/superset/pull/34513#issuecomment-3857198053
## **Sequence Diagram**
Shows the added mutator that converts PostgreSQL INTERVAL values (timedelta)
into numeric seconds so bar and pie charts receive numeric metrics and render
correctly.
```mermaid
sequenceDiagram
participant Frontend
participant Backend
participant DB
participant PostgresEngineSpec
Frontend->>Backend: Request chart data (metric = INTERVAL)
Backend->>DB: Execute query returning INTERVAL column
DB-->>Backend: INTERVAL values (timedelta objects)
Backend->>PostgresEngineSpec: Normalize column values using
column_type_mutators
PostgresEngineSpec-->>Backend: Converted metrics (timedelta -> total
seconds)
Backend-->>Frontend: Return numeric chart data
Frontend-->>Frontend: Render bar/pie chart with numeric metric
```
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