simi commented on issue #53905:
URL: https://github.com/apache/airflow/issues/53905#issuecomment-3408590260
faced the same (randomly) with Airflow 3.0.1 and PostgreSQL DB backend
```
[2025-10-14, 02:06:17] DEBUG - Connection not found in any of the configured
Secrets Backends. Trying to retrieve from API server: conn_id="cerberus":
source="task"
[2025-10-14, 02:06:17] DEBUG - Sending request:
json="{\"conn_id\":\"cerberus\",\"type\":\"GetConnection\"}\n": source="task"
[2025-10-14, 02:06:24] ERROR - Error response from the API Server:
source="task"
[2025-10-14, 02:06:24] ERROR - Task failed with exception: source="task"
AirflowRuntimeError: API_SERVER_ERROR: {'status_code': 409, 'message':
'Server returned error', 'detail': {'detail': {'reason': 'Unique constraint
violation', 'statement': 'INSERT INTO rendered_task_instance_fields (dag_id,
task_id, run_id, map_index, rendered_fields, k8s_pod_yaml) VALUES (%(dag_id)s,
%(task_id)s, %(run_id)s, %(map_index)s, %(rendered_fields)s,
%(k8s_pod_yaml)s)', 'orig_error': 'duplicate key value violates unique
constraint "rendered_task_instance_fields_pkey"\nDETAIL: Key (dag_id, task_id,
run_id, map_index)=(splits_yt_catalog, export_organization_yt_catalog,
scheduled__2025-10-14T00:06:00+00:00, 4) already exists.\n'}}}
[2025-10-14, 02:06:24] DEBUG - Sending request:
json="{\"state\":\"failed\",\"end_date\":\"2025-10-14T00:06:24.951168Z\",\"type\":\"TaskState\",\"rendered_map_index\":null}\n":
source="task"
[2025-10-14, 02:06:24] DEBUG - Running
```
I'm happy to share interesting DAG parts (not sure which ones). It is using
`expand_kwargs` and it seems to repeat randomly once per cca 3 weeks on daily
task. This happens on "generated" task with random map index (seen with index 4
and index 5 in recent month).
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