---
phase: 10-seeder-checksum-integration
verified: 2026-03-25T23:10:00Z
status: passed
score: 4/4 must-haves verified
re_verification: false
---

# Phase 10: Seeder Checksum Integration Verification Report

**Phase Goal:** Every Vision ZIP downloaded by tick_cache_seeder is SHA-256 verified against the .CHECKSUM file before being accepted into the Parquet cache
**Verified:** 2026-03-25T23:10:00Z
**Status:** passed
**Re-verification:** No — initial verification

---

## Goal Achievement

### Observable Truths

| #   | Truth                                                                                                   | Status   | Evidence                                                                                                                        |
| --- | ------------------------------------------------------------------------------------------------------- | -------- | ------------------------------------------------------------------------------------------------------------------------------- |
| 1   | Every Vision ZIP download is SHA-256 verified against its .CHECKSUM file before Parquet write           | VERIFIED | `_download_and_verify_vision_day()` wraps all Vision downloads; calls `_verify_vision_checksum()` before returning df to caller |
| 2   | A checksum mismatch triggers up to 2 re-downloads; persistent failure sends LOUD Telegram alert         | VERIFIED | Lines 434-471: retry loop `for attempt in range(1 + max_retries)`, `send_telegram()` called after all retries exhausted         |
| 3   | Each successful verification is recorded in ChecksumRegistry with symbol, date, checksum, source=seeder | VERIFIED | Line 476: `registry.add(symbol=symbol, date=date_str, sha256=sha256, source="seeder")`                                          |
| 4   | The seeder state file includes checksum pass/fail/skip counts                                           | VERIFIED | Lines 1296-1298: `checksum_pass=`, `checksum_fail=`, `checksum_skip=` written to state file                                     |

**Score:** 4/4 truths verified

---

### Required Artifacts

| Artifact                        | Expected                                                | Status   | Details                                                                                                                                             |
| ------------------------------- | ------------------------------------------------------- | -------- | --------------------------------------------------------------------------------------------------------------------------------------------------- |
| `scripts/tick_cache_seeder.py`  | Checksum verification integrated into download pipeline | VERIFIED | 1312 lines; `_verify_vision_checksum`, `_download_vision_day_raw`, `_download_and_verify_vision_day`, `_download_and_verify_day_worker` all present |
| `tests/test_seeder_checksum.py` | Unit tests for checksum verification (min 80 lines)     | VERIFIED | 279 lines, 9 test functions — exceeds minimum                                                                                                       |

---

### Key Link Verification

| From                           | To                                             | Via                                                  | Status | Details                                                                                                                                                               |
| ------------------------------ | ---------------------------------------------- | ---------------------------------------------------- | ------ | --------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| `scripts/tick_cache_seeder.py` | `opendeviationbar._core`                       | `parse_checksum_file_content`, `verify_checksum_hex` | WIRED  | Line 50: `from opendeviationbar._core import parse_checksum_file_content, verify_checksum_hex` — both called in `_verify_vision_checksum()`                           |
| `scripts/tick_cache_seeder.py` | `python/opendeviationbar/checksum_registry.py` | `ChecksumRegistry.add()` + `save()`                  | WIRED  | Lines 1164-1166: registry instantiated in `main()`; line 476: `registry.add()` in `_download_and_verify_vision_day()`; line 1264: `registry.save()` after thread pool |
| `scripts/tick_cache_seeder.py` | `python/opendeviationbar/notify/telegram.py`   | `send_telegram` for LOUD checksum failure alerts     | WIRED  | Line 51: `from opendeviationbar.notify.telegram import send_telegram`; called at line 461 on persistent failure                                                       |

---

### Data-Flow Trace (Level 4)

Not applicable — `tick_cache_seeder.py` is a script (not a UI component rendering dynamic data). The relevant data flow is: Vision ZIP bytes -> `_verify_vision_checksum()` -> `registry.add()` -> `registry.save()`. This chain is fully verified via code inspection and test suite.

---

### Behavioral Spot-Checks

| Behavior                                                          | Method                                                                | Result             | Status |
| ----------------------------------------------------------------- | --------------------------------------------------------------------- | ------------------ | ------ |
| 9 offline tests cover all verification paths                      | `pytest tests/test_seeder_checksum.py`                                | 9 passed in 1.03s  | PASS   |
| Phase 8+9 regression: existing checksum bindings + registry tests | `pytest tests/test_checksum_spike.py tests/test_checksum_registry.py` | 28 passed in 1.56s | PASS   |

---

### Requirements Coverage

| Requirement | Source Plan | Description                                                                                          | Status    | Evidence                                                                                     |
| ----------- | ----------- | ---------------------------------------------------------------------------------------------------- | --------- | -------------------------------------------------------------------------------------------- |
| SEEDER-01   | 10-01-PLAN  | `tick_cache_seeder.py` verifies SHA-256 checksum of every Vision ZIP download against .CHECKSUM file | SATISFIED | `_verify_vision_checksum()` called for every Vision download; PyO3 bindings wired at line 50 |
| SEEDER-02   | 10-01-PLAN  | Checksum mismatch triggers re-download (up to 2 retries) before failing loudly with Telegram alert   | SATISFIED | Retry loop lines 434-471; `send_telegram()` on exhaustion; test 5+7 verify behavior          |
| SEEDER-03   | 10-01-PLAN  | Per-file verification status persisted (symbol, date, checksum, verified_at) for audit trail         | SATISFIED | `registry.add(source="seeder")` line 476; `registry.save()` line 1264; test 6 verifies call  |

**Notes on REQUIREMENTS.md state:** The traceability table (rows 40-42) still shows SEEDER-01/02/03 as "Pending" but the requirement checkboxes (lines 16-18) show them as `[x]` (completed). This is a documentation inconsistency — the code satisfies all three requirements. The traceability table should be updated to show "Shipped" and the actual plan number ("10-01").

---

### Anti-Patterns Found

| File | Line | Pattern | Severity | Impact |
| ---- | ---- | ------- | -------- | ------ |
| None | —    | —       | —        | —      |

No anti-patterns detected. No TODO/FIXME/placeholder markers. No empty implementations. Retry logic is complete. Telegram alert contains real message content (not a stub).

One minor note: `_download_vision_day_raw()` duplicates CSV parsing logic from `_download_vision_day()` — this is an acknowledged design decision from SUMMARY.md ("avoids modifying existing function signature for backward compat"). Not a stub, not a blocker.

---

### Human Verification Required

None. All paths are verifiable through code inspection and the offline test suite. The Telegram alert path would require a network call to verify end-to-end delivery, but the mock in test 7 confirms `send_telegram()` is called with the correct CHECKSUM FAIL message content and `disable_notification=False`. Actual message delivery is a Phase 9/notify concern already verified in prior phases.

---

### Gaps Summary

No gaps. All four observable truths verified. All three requirements (SEEDER-01, SEEDER-02, SEEDER-03) satisfied. Both required artifacts exist, are substantive, and are fully wired. The 9 offline tests all pass. Phase 8+9 regressions (28 tests) all pass.

The REQUIREMENTS.md traceability table status column is stale ("Pending" instead of "Shipped") — this is a documentation maintenance issue for a future pass, not a code gap.

---

_Verified: 2026-03-25T23:10:00Z_
_Verifier: Claude (gsd-verifier)_
