Lee-W opened a new pull request, #69700:
URL: https://github.com/apache/airflow/pull/69700
## Why
- Partition keys containing `/` returned 404 on the detail endpoint — the
key was carried as a path segment, so the slash was interpreted as a route
separator.
- Duplicate pending `AssetPartitionDagRun` rows crashed the detail endpoint
with a 500 (`MultipleResultsFound` from `.one_or_none()`).
- Many-to-one non-rollup mappers over-reported progress on the detail view —
received credit was uncapped, so it disagreed with the list view for the same
partition.
## What
- Move `partition_key` from a path segment to a query parameter on the
detail endpoint, so slash-containing keys round-trip correctly.
- Take the latest pending row via `order_by(id.desc()).limit(1)` instead of
`.one_or_none()`, matching the existing `_get behavior in `assets/manager.py`
and the model docstring.
- Cap non-rollup received credit at 1, aligning the detail with the list
endpoint's `_compute_received_count`.
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