---
model: gpt-5.6-sol
provider: openai
service: opencode
timestamp: 2026-07-29T04:17:23Z
git_ref: ce33deb6
diff_cmd: git diff HEAD~1..HEAD
---

> `git diff HEAD~1..HEAD -- piker/storage/nativedb.py piker/storage/_audit.py tests/test_storage_nativedb.py tests/test_storage_audit.py`

Fixed the remaining legacy first-slot sentinel observed in live MNQ 60s
history: `time=60` with zero open, high, low, close, and volume. NativeDB now
repairs the exact sentinel before read hydration and merge, reindexes the
filtered view, and persists the repaired frame on the next valid update.

The repair remains narrowly scoped. Modern all-zero OHLC bars stay valid for
spreads or synthetic instruments, null-containing malformed rows still fail
validation, new writes can not recreate the first-slot sentinel, and a file
containing only sentinels loads as no history so fresh backfill can proceed.

The raw audit reports total all-zero price rows, classifies first-slot
sentinels as structural violations, and leaves later all-zero rows visible as
unclassified warnings.

Verification generated with the patch:

- NativeDB, audit, history, xonsh, and IB regressions: 61 passed
- focused Ruff: passed
- `git diff --check`: passed
- final adversarial review: no findings