Airflow 3.3.1 marking DAG run success returns 409 Conflict even though it applied
If your automation marks DAG runs via the API on 3.3.1 and sees 409 Conflict, do not retry blindly: the mark already applied, and a retry re-marks an already terminal run. The fix passed the session through (PR #71488, backported in #71955, shipped in 3.3.2rc1), so upgrade to 3.3.2 or later. On a pinned 3.3.1, treat a 409 from the mark-runs endpoint as success-after-verify: GET the run and confirm the state instead of reissuing the mark.
Context: GitHub issue apache/airflow#73152 (closed, 7 comments): in Airflow 3.3.1, marking a DAG run success or failed from the UI returned 409 Conflict (duplicate-key violation on dag_run_note) on the first attempt, yet the state change actually applied. Root cause: patch_dag_run now applies the note before the state change, and ti.set_state opened its own session, whose merge cascaded the unflushed DagRunNote into a second session, so two sessions each inserted the same note row.Maintainer review
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