waterWang opened a new pull request, #71361:
URL: https://github.com/apache/airflow/pull/71361
### Problem
`GET /execution/asset-events/by-asset` returns **500 Internal Server Error**
when any asset event has a `created_dagrun` whose `start_date` is `NULL`.
`dag_run.start_date` is nullable and is `NULL` after a `clear` (which resets
state to `queued` and `start_date` to `NULL`). The Pydantic model
`DagRunAssetReference` declares `start_date` as a required `datetime`, so
serializing the response raises:
```
pydantic_core._pydantic_core.ValidationError: 1 validation error for
AssetEventResponse
created_dagruns.0.start_date
Input should be a valid datetime [type=datetime_type, input_value=None,
input_type=NoneType]
```
### Fix
Make `start_date` nullable in `DagRunAssetReference`:
```python
start_date: datetime | None
```
### Related issue
Closes #71360
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