---
milestone: v1.2
audited: 2026-02-24
status: passed
scores:
  requirements: 22/22
  phases: 5/5
  integration: 22/22
  flows: 5/5
gaps:
  requirements: []
  integration: []
  flows: []
tech_debt: []
---

# Milestone v1.2: Pluggable Storage Backends — Audit Report

**Milestone Goal:** Introduce a pluggable KV storage backend layer, refactor TaskStore to delegate to it, and validate with DynamoDB + Redis implementations.

**Audited:** 2026-02-24
**Status:** PASSED
**Phases:** 5/5 complete (9, 10, 11, 12, 13)

## Phase Verification Summary

| Phase | Name | Score | Status | Gaps |
|-------|------|-------|--------|------|
| 9 | Storage Abstraction Layer | 11/11 | passed | None |
| 10 | InMemory Backend Refactor | 9/9 | passed | None |
| 11 | DynamoDB Backend | 11/11 | passed | None |
| 12 | Redis Backend | 12/12 | passed | None |
| 13 | Feature Flag Verification | 7/7 | passed | None |

**Total must-haves:** 50/50 verified

## Requirements Coverage (3-Source Cross-Reference)

All 22 v1.2 requirements verified across three independent sources:

| Requirement | VERIFICATION.md | SUMMARY Frontmatter | REQUIREMENTS.md | Final Status |
|-------------|-----------------|---------------------|-----------------|--------------|
| ABST-01 | Phase 9: SATISFIED | 09-01: listed | `[x]` Complete | **satisfied** |
| ABST-02 | Phase 9: SATISFIED | 09-02: listed | `[x]` Complete | **satisfied** |
| ABST-03 | Phase 9: SATISFIED | 09-01: listed | `[x]` Complete | **satisfied** |
| ABST-04 | Phase 9: SATISFIED | 09-02: listed | `[x]` Complete | **satisfied** |
| IMEM-01 | Phase 10: SATISFIED | 10-01, 10-02: listed | `[x]` Complete | **satisfied** |
| IMEM-02 | Phase 10: SATISFIED | 10-01: listed | `[x]` Complete | **satisfied** |
| IMEM-03 | Phase 10: SATISFIED | 10-01: listed | `[x]` Complete | **satisfied** |
| TEST-01 | Phase 10: SATISFIED | 10-02: listed | `[x]` Complete | **satisfied** |
| DYNA-01 | Phase 11: SATISFIED | 11-01: listed | `[x]` Complete | **satisfied** |
| DYNA-02 | Phase 11: SATISFIED | 11-01: listed | `[x]` Complete | **satisfied** |
| DYNA-03 | Phase 11: SATISFIED | 11-01: listed | `[x]` Complete | **satisfied** |
| DYNA-04 | Phase 11: SATISFIED | 11-01: listed | `[x]` Complete | **satisfied** |
| DYNA-05 | Phase 11: SATISFIED | 11-01: listed | `[x]` Complete | **satisfied** |
| DYNA-06 | Phase 11: SATISFIED | 11-02: listed | `[x]` Complete | **satisfied** |
| TEST-02 | Phase 11: SATISFIED | 11-02: listed | `[x]` Complete | **satisfied** |
| RDIS-01 | Phase 12: SATISFIED | 12-01: listed | `[x]` Complete | **satisfied** |
| RDIS-02 | Phase 12: SATISFIED | 12-01: listed | `[x]` Complete | **satisfied** |
| RDIS-03 | Phase 12: SATISFIED | 12-01: listed | `[x]` Complete | **satisfied** |
| RDIS-04 | Phase 12: SATISFIED | 12-01: listed | `[x]` Complete | **satisfied** |
| RDIS-05 | Phase 12: SATISFIED | 12-01: listed | `[x]` Complete | **satisfied** |
| TEST-03 | Phase 12: SATISFIED | 12-02: listed | `[x]` Complete | **satisfied** |
| TEST-04 | Phase 13: SATISFIED | 13-01: listed | `[x]` Complete | **satisfied** |

**Orphaned requirements:** 0
**Unsatisfied requirements:** 0

## Cross-Phase Integration

### Wiring Summary

| Check | Count | Status |
|-------|-------|--------|
| Connected exports | 22 | All wired |
| Orphaned exports | 0 | Clean |
| Missing connections | 0 | Clean |
| Unprotected routes | 0 | Clean |

### Architecture Wiring

```
TaskRouterImpl / TaskContext
  -> Arc<dyn TaskStore>          (blanket impl, Phase 9)
  -> GenericTaskStore<B>          (all domain logic, Phase 9)
  -> StorageBackend trait         (Phase 9)
       -> InMemoryBackend         (Phase 10, DashMap)
       -> DynamoDbBackend         (Phase 11, feature-gated)
       -> RedisBackend            (Phase 12, feature-gated)
```

### E2E Flows

| # | Flow | Path | Status |
|---|------|------|--------|
| 1 | Create Task | `TaskRouterImpl -> TaskStore::create -> GenericTaskStore -> StorageBackend::put` | Complete |
| 2 | Task Lifecycle | `create -> update_status (CAS) -> complete_with_result (CAS)` | Complete |
| 3 | Variable Merge | `set_variables -> validate_variables -> put_if_version` | Complete |
| 4 | Backend Substitution | `GenericTaskStore<InMemory\|DynamoDB\|Redis>` all satisfy `Arc<dyn TaskStore>` | Complete |
| 5 | Feature Flag Gating | 4 combos compile, pass clippy, pass tests, pass doc generation | Complete |

### Behavioral Divergence (Documented, Non-Breaking)

`StorageBackend::put_if_version` on missing keys:
- InMemoryBackend: `StorageError::NotFound`
- DynamoDbBackend: `StorageError::VersionConflict`
- RedisBackend: `StorageError::VersionConflict`

Unreachable through `GenericTaskStore` (always does `get` before `put_if_version`). Documented in Phase 11 and 12 SUMMARYs as a locked decision.

## Tech Debt

No tech debt items found across all 5 phases. All files scanned for TODO/FIXME/HACK/PLACEHOLDER — zero findings.

## Human Verification Items

Two items require human verification with live infrastructure:

| Phase | Item | Command |
|-------|------|---------|
| 11 | DynamoDB integration tests against real AWS | `cargo test -p pmcp-tasks --features dynamodb-tests -- ddb_ --test-threads=1` |
| 12 | Redis integration tests against live Redis | `cargo test -p pmcp-tasks --features redis-tests -- redis_ --test-threads=1` |

## Quality Gates

| Check | Result |
|-------|--------|
| All phases verified | 5/5 passed |
| All requirements satisfied | 22/22 |
| Cross-phase integration | Clean (22/22 wired) |
| E2E flows | 5/5 complete |
| Anti-patterns | 0 found |
| Tech debt | 0 items |

---

_Audited: 2026-02-24_
_Auditor: Claude (gsd-audit-milestone)_
