---
phase: 50
slug: code-quality-test-coverage
status: verified
threats_open: 0
asvs_level: 1
created: 2026-04-14
---

# Phase 50 — Security

> Per-phase security contract: threat register, accepted risks, and audit trail.

---

## Trust Boundaries

| Boundary | Description | Data Crossing |
|----------|-------------|---------------|
| None | Phase 50 is internal code quality — no new trust boundaries, no new parsing paths, no FFI changes, no new user input handling | N/A |

---

## Threat Register

| Threat ID | Category | Component | Disposition | Mitigation | Status |
|-----------|----------|-----------|-------------|------------|--------|
| T-50-01 | Tampering | Test assertions (sql_gen.rs) | accept | Golden-file anchor preserved; `just test-all` quality gate catches regressions | closed |
| T-50-02 | Tampering | resolve_names helper (sql_gen.rs) | accept | Behavioral equivalence verified by 700+ existing unit tests + 38 new tests from Plan 01 | closed |
| T-50-03 | Tampering | Newtype Eq/Hash consistency (types.rs) | mitigate | 7 dedicated unit tests verify DimensionName("Foo") == DimensionName("foo") and matching Hash behavior; inconsistency would break HashSet dedup | closed |

*Status: open · closed*
*Disposition: mitigate (implementation required) · accept (documented risk) · transfer (third-party)*

---

## Accepted Risks Log

| Risk ID | Threat Ref | Rationale | Accepted By | Date |
|---------|------------|-----------|-------------|------|
| AR-50-01 | T-50-01 | Test assertion conversion is low-risk — golden anchor preserved, full test suite catches regressions | Claude (automated) | 2026-04-14 |
| AR-50-02 | T-50-02 | Resolution loop deduplication is behavioral-equivalent refactoring under comprehensive test coverage | Claude (automated) | 2026-04-14 |

*Accepted risks do not resurface in future audit runs.*

---

## Security Audit Trail

| Audit Date | Threats Total | Closed | Open | Run By |
|------------|---------------|--------|------|--------|
| 2026-04-14 | 3 | 3 | 0 | Claude (automated) |

---

## Sign-Off

- [x] All threats have a disposition (mitigate / accept / transfer)
- [x] Accepted risks documented in Accepted Risks Log
- [x] `threats_open: 0` confirmed
- [x] `status: verified` set in frontmatter

**Approval:** verified 2026-04-14
