ephraimbuddy opened a new pull request, #68389:
URL: https://github.com/apache/airflow/pull/68389
The latest DagVersion was selected by created_at DESC, which
is not deterministic when two versions share a timestamp (or under clock
skew).
write_dag derives the next version_number from that row, so picking a
non-max row collided with the (dag_id, version_number) unique constraint. Order
by the monotonic, unique version_number instead, consistently across
get_latest_version/write_dag, get_version, and the bulk prefetch.
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Claude opus 4.8
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