ephraimbuddy opened a new pull request, #68253:
URL: https://github.com/apache/airflow/pull/68253
Historical task instances created before the dag_version table existed have
dag_version_id=None. When the scheduler built a dag callback context with such
a TI as last_ti, the non-null UUID datamodel validation raised a
ValidationError and crashlooped the scheduler. Drop last_ti in that case so the
callback still fires with a minimal context.
closes: #68248
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claude opus 4.8
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