---
model: openai/gpt-5.6-sol
service: opencode
timestamp: 2026-07-29T20:40:46Z
git_ref: ad6c560f
diff_cmd: git diff HEAD~1..HEAD
---

The user reported that QQQ still displayed a gap on the 1-second chart
after the focused `ldshm` fix and asked the agent to inspect it. The user
then paused and resumed implementation while shutting down the live piker
trading workspace.

Read-only live inspection found the active datad generation held 653
contiguous zero-time rows in QQQ's 1-second RT SHM, while durable Parquet
contained no zero rows. The run occupied absolute indexes 168148 through
168800 between timestamps 1785348398 and 1785349051. The stale actor
generation and active 60-second history were separately identified.

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

Generated history changes that exclude each inclusive reverse-query
endpoint already present in SHM while retaining the full provider frame
for NativeDB merge. Startup null repair now runs after reverse backfill,
uses bounded UI notifications, handles provider no-data without an
interactive pause, fills only exact interior zero groups, and refuses
synthetic timestamps unless both valid boundaries establish the expected
cadence.

> `git diff HEAD~1..HEAD -- piker/brokers/ib/feed.py`

Generated IB history reset changes that make blank responses complete,
bound repeated cancellation and reset failures per request, serialize
timeout and pacing farm resets with one actor-global Trio lock, carry
explicit reset results, and coordinate pacing handoff with queued timeout
waiters.

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

Generated regressions for inclusive endpoint exclusion, full NativeDB
provider deltas, strict synthetic gap boundaries, empty-provider local
fallback, bounded notifications, and preservation of valid margin rows.

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

Generated deterministic regressions for blank IB responses, cancellation
limits, stalled reset cancellation, pacing reset failure limits,
cross-request reset serialization, timeout-to-pacing handoff, and
successful handoff timeout restart.

> `git diff HEAD~1..HEAD -- .claude/skills/run-tests/test-harness-reference.md`

Registered the deterministic history-backfill target and expanded the IB
history mapping to include `feed.py`.

Verification output:

```text
........................................................................ [ 93%]
.....                                                                    [100%]
77 passed in 2.12s
```

`git diff --check` passed. Multiple adversarial review rounds identified
and drove fixes for unbounded IB empty/cancellation/reset paths, stale
reset ownership, actor-global failure poisoning, concurrent farm resets,
double-counted pacing handoffs, physical endpoint overlap, and unsafe
synthetic timestamp boundaries. Final review reported no findings.

Live validation was intentionally deferred because the user shut down the
trading workspace. A fresh datad/chart startup is required to regenerate
SHM and verify that QQQ no longer contains the 653-row null run.
