---
model: gpt-5.6-sol
provider: openai
service: opencode
session: 24fb9765-a550-4570-8350-f0fc9b7e17db
timestamp: 2026-07-28T00:50:34Z
git_ref: ed85721c
scope: code
substantive: true
raw_file: 20260728T005034Z_ed85721c_prompt_io.raw.md
---

## Prompt

Add reusable read-only tooling to qualify raw NativeDB Parquet against a
known gappy IB chart, beginning with `mnq.cme.20260918`. Preserve malformed
evidence and distinguish structural validity from unclassified positive
gaps without opening or mutating the storage runtime.

## Response summary

Implemented raw Parquet audit reporting with human and JSON output, bounded
cadence details, exact integer arithmetic, strict status, collision-safe
snapshot capture, and source path protections. Regressions cover malformed
schema and values, timestamp precision, gap arithmetic, corrupt bytes,
copy failures, symlinks, traversal, and read-only CLI behavior.

## Files changed

- `piker/storage/_audit.py` - raw Parquet audit and snapshot implementation
- `piker/storage/cli.py` - `piker store audit` command
- `tests/test_storage_audit.py` - audit and CLI regressions
- `ai/prompt-io/opencode/20260728T005034Z_ed85721c_prompt_io.raw.md`
  - unedited response record
- `ai/prompt-io/opencode/20260728T005034Z_ed85721c_prompt_io.md`
  - provenance metadata and response summary

## Human edits

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