---
created_at: 2026-11-06T18:56:28.621577+00:00
generated_by:
  harness: codex
  provider: OpenAI
git_ref: 495c0915
diff_cmd: git diff HEAD~1..HEAD
---

> `git diff HEAD~1..HEAD -- piker/tsp/_history.py`

> `git diff HEAD~1..HEAD -- tests/test_history_backfill.py`

Partial backport of the NoData/DataUnavailable catch from
0846cbd4a4197e47415689cf5e9d146ba3174c32 into
maybe_fill_null_segments(). The existing gap fallback remains in use.
A new parametrized regression uses real null detection and verifies
that a sibling in the same nursery survives the failed repair.

Both new cases failed before the catch. The focused history suites
passed after it: 17 passed. This does not qualify live overlap or fix
IB reset churn or the separate Tractor completion-callback assertion.