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fix(data): unify checkpoint-only first-segment seed rule across verifier modes - #856

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@proerror77 proerror77 commented Aug 12, 2026

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The market-tape verifier rejected a replay-safe checkpoint-only first segment in trade-summaries mode, even though LOB mode already accepts a replay-safe checkpoint as the replay state seed. This made manifest-valid segments fail strict verification as non-replayable and blocked the 5-minute correctness Shadow from starting.

Add the missing !require_trade_summaries exemption so a replay-safe checkpoint establishes replay state in trade mode too, matching LOB mode. The replay_safe/synced/bridged checks immediately after still reject unsafe checkpoints. Add a regression test covering the checkpoint-only first segment.

Issue relationship

Refs #846

Validation

  • cargo test -p hft-data --locked first_segment_replay_safe_checkpoint_seeds_plain_trade_verifier — 1 passed
  • cargo test -p hft-data --locked — 86 passed, 0 failed

Runtime impact and rollback

None. Research/data-pipeline verifier only; no runtime, execution, or risk path touched. Rollback = revert this commit.

Summary by CodeRabbit

  • Bug Fixes
    • Improved replay handling when trade summaries are required but no snapshot seed is available.
    • Replay-safe checkpoints can now initialize replay state correctly.
    • Added coverage for checkpoint-only trade-summary verification.

…ier modes

The market-tape verifier rejected a replay-safe checkpoint-only first
segment in trade-summaries mode even though LOB mode already accepts a
replay-safe checkpoint as the replay state seed. This made manifest-valid
segments fail strict verification as non-replayable and blocked the
5-minute correctness Shadow from starting.

Add the missing `!require_trade_summaries` exemption so a replay-safe
checkpoint establishes replay state in trade mode too, matching LOB mode.
The replay_safe/synced/bridged checks immediately after still reject
unsafe checkpoints. Add a regression test covering the checkpoint-only
first segment.
@coderabbitai

coderabbitai Bot commented Aug 12, 2026

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Review Change Stack

📝 Walkthrough

Walkthrough

The Binance market-tape verifier now accepts replay-safe checkpoint-only first segments when aggregate-trade summaries are required. A regression test verifies snapshot-plus-checkpoint replay events without snapshot or diff rows.

Changes

Trade-summary replay verification

Layer / File(s) Summary
Checkpoint replay validation
rust_hft/data-pipelines/core/src/binance_market_tape_artifact.rs
Checkpoint-only first segments can establish replay state for trade-summary verification. Ordinary verification and LOB-continuity modes still require the existing snapshot seed. A regression test covers the checkpoint-only input and replay events.

Estimated code review effort: 2 (Simple) | ~10 minutes

Possibly related PRs

🚥 Pre-merge checks | ✅ 5
✅ Passed checks (5 passed)
Check name Status Explanation
Title check ✅ Passed The title clearly identifies the checkpoint-only first-segment seed rule and its application across verifier modes.
Description check ✅ Passed The description includes the required change, issue relationship, validation results, and runtime impact with rollback details.
Docstring Coverage ✅ Passed No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check ✅ Passed Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check ✅ Passed Check skipped because no linked issues were found for this pull request.
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  • Commit unit tests in branch codex/stale-manifest-seed-0e913

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💡 Codex Review

Here are some automated review suggestions for this pull request.

Reviewed commit: 2eee33ce03

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} else {
if identities.is_empty()
&& !snapshot_seeds.contains(&symbol)
&& !require_trade_summaries

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P1 Badge Keep trade-only verification fail-closed on checkpoint seeds

When binance-lob-archiver performs strict verification without --require-lob-continuity (binance-lob-archiver.rs:1165-1169), this clause now suppresses the only requirement that the first segment contain a snapshot merely because the independent aggregate-trade summary contract is present. A checkpoint-only segment can therefore self-assert replay_safe/synced/bridged without any stream-coverage or LOB-continuity evidence and still produce a verified replay book, potentially admitting unproven depth state into the correctness Shadow. Keep this exemption tied to LOB continuity or require equivalent depth-specific evidence rather than using require_trade_summaries.

AGENTS.md reference: AGENTS.md:L41-L42

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🧹 Nitpick comments (1)
rust_hft/data-pipelines/core/src/binance_market_tape_artifact.rs (1)

2274-2294: 📐 Maintainability & Code Quality | 🔵 Trivial | ⚡ Quick win

Add negative coverage for unsafe checkpoint-only segments.

Add cases that set replay_safe, synced, and bridged to false. Assert that verify_binance_market_tape_with_required_trade_summaries rejects each case. This protects the safety checks preserved by the production change.

🤖 Prompt for AI Agents
Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

In `@rust_hft/data-pipelines/core/src/binance_market_tape_artifact.rs` around
lines 2274 - 2294, Add negative test coverage alongside
first_segment_replay_safe_checkpoint_seeds_plain_trade_verifier by creating
checkpoint-only segments with replay_safe, synced, and bridged each set to false
in separate cases. Assert that
verify_binance_market_tape_with_required_trade_summaries rejects every case,
preserving the existing positive replay-safe test.
🤖 Prompt for all review comments with AI agents
Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Nitpick comments:
In `@rust_hft/data-pipelines/core/src/binance_market_tape_artifact.rs`:
- Around line 2274-2294: Add negative test coverage alongside
first_segment_replay_safe_checkpoint_seeds_plain_trade_verifier by creating
checkpoint-only segments with replay_safe, synced, and bridged each set to false
in separate cases. Assert that
verify_binance_market_tape_with_required_trade_summaries rejects every case,
preserving the existing positive replay-safe test.

ℹ️ Review info
⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: ccbdebb2-edc1-417e-972b-89d9687d85df

📥 Commits

Reviewing files that changed from the base of the PR and between 0e913bc and 2eee33c.

📒 Files selected for processing (1)
  • rust_hft/data-pipelines/core/src/binance_market_tape_artifact.rs

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Withdrawn. The Codex P1 review is correct: the !require_trade_summaries exemption weakens the fail-closed snapshot-seed gate in trade-only mode, where a checkpoint carries no stream-coverage/continuity evidence. The correct fix for the blocked 5-min correctness Shadow is on the Collector/corpus side (emit/require a snapshot seed), not by weakening the verifier. Closing; will address the real root cause separately.

@proerror77 proerror77 closed this Aug 12, 2026
@proerror77
proerror77 deleted the codex/stale-manifest-seed-0e913 branch August 13, 2026 06:37
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