---
model: gpt-5.6-sol
provider: openai
service: opencode
session: 24fb9765-a550-4570-8350-f0fc9b7e17db
timestamp: 2026-07-29T04:17:23Z
git_ref: ce33deb6
scope: code
substantive: true
raw_file: 20260729T041723Z_ce33deb6_prompt_io.raw.md
---

## Prompt

Diagnose why the chart still showed a zero first OHLCV row after the
epoch-zero timestamp repair, causing auto-y-ranging to include zero.

## Response summary

Audited live 60s and 1s NativeDB files and found one exact 60s first-slot
sentinel at epoch 60 with a completely zero OHLCV payload. Added narrowly
scoped read and merge repair, matching incoming validation, sentinel-only
startup handling, canonical reindexing, and explicit audit classification.
Preserved modern all-zero bars as unclassified evidence rather than assuming
all zero-priced instruments are corrupt.

## Files changed

- `piker/storage/nativedb.py` - first-slot sentinel repair and validation
- `piker/storage/_audit.py` - sentinel classification and zero-row evidence
- `tests/test_storage_nativedb.py` - hydration, merge, and boundary regressions
- `tests/test_storage_audit.py` - sentinel and modern-zero audit regressions
- `ai/prompt-io/opencode/20260729T041723Z_ce33deb6_prompt_io.raw.md`
  - unedited response record
- `ai/prompt-io/opencode/20260729T041723Z_ce33deb6_prompt_io.md`
  - provenance metadata and response summary

## Human edits

None - generated changes have not been edited by the human.