Lee-W opened a new pull request, #68883:
URL: https://github.com/apache/airflow/pull/68883
A partitioned backfill whose window contains no partition runs (e.g. a
sparse weekly timetable asked to backfill a single non-matching day) used to
surface as a raw HTTP 500, and the create path committed the Backfill row
before checking for runs — leaving an active orphan that blocked every later
retry with AlreadyRunningBackfill.
Empty windows are now detected before any DB write and raised as
NoBackfillRunsToCreate: the REST route returns 422 and the CLI prints a
friendly message instead of a traceback. Dry-run keeps returning zero entries
(a valid preview result), so create and preview stay intentionally asymmetric.
The CLI dry-run path now converts reprocess_behavior to its enum and passes
dag_run_conf, matching what the real create path receives so the preview no
longer drifts from execution.
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