Lee-W opened a new pull request, #69453:
URL: https://github.com/apache/airflow/pull/69453
## Why
`POST /assets/events` accepted any `partition_key` without validation. Two
bad cases slipped through:
- Empty or whitespace-only keys were silently stored as-is.
- Keys longer than `ID_LEN` (250) chars hit the database column-length limit
and surfaced as a `500 Internal Server Error`, leaking an internal failure
instead of telling the client the input was invalid.
The Execution API already validates this field; the public API should behave
the same way.
## What
- Add a `field_validator` on `CreateAssetEventsBody.partition_key` that
rejects empty / whitespace-only values and values exceeding `ID_LEN`, returning
`422` instead of storing bad data or raising `500`.
- `None` remains valid (the field stays optional), so non-partitioned events
are unaffected.
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