# AD-466 Build Report

**Date:** 2026-05-01
**Builder:** Wave 7 continuous-build (1 of 5)

## Sections Implemented

| Section | File | Status |
|---|---|---|
| Section 0+4: EventTypes | `src/probos/events.py` | ✅ Added `BACKUP_COMPLETE`, `BACKUP_FAILED` after `INFODYNAMIC_REPORT` |
| Section 1: Package init | `src/probos/infrastructure/__init__.py` (new) | ✅ Owns directory creation |
| Section 2: BackupService + BackupResult | `src/probos/infrastructure/backup.py` (new) | ✅ |
| Section 3: StorageBackend ABC + SQLiteStorageBackend | `src/probos/infrastructure/storage_backend.py` (new) | ✅ |
| Section 5: InfrastructureConfig | `src/probos/config.py` | ✅ Added Pydantic class + field after `infodynamic: InfodynamicConfig` |
| Section 6: finalize.py wiring | `src/probos/startup/finalize.py` | ✅ Always-wired with try/except OSError mkdir guard (Revision-section variant); `runtime.storage_backend` + `runtime.backup_service` (public) |
| Tests | `tests/test_ad466_infrastructure.py` (new) | ✅ 12/12 pass at `-n 0` |
| Tracking | `PROGRESS.md`, `docs/development/roadmap.md:4177` | ✅ Updated |

## Test Results

- Focused gate: `pytest tests/test_ad466_infrastructure.py -v -n 0` → **12/12 passed in 0.28s**
- Full parallel gate: **10,404 passed (+12 vs baseline 10,392), 14 skipped**

## Notes / Decisions

- Owns `src/probos/infrastructure/__init__.py` directory creation (mirrors AD-455 `security/`, AD-457 `agents/engineering/`, AD-459 `degradation/` precedents).
- Used Revision-section finalize wiring (try/except OSError mkdir guard) per pass-2 review rec#2.
- Test #7 (`test_backup_service_snapshot_emits_failed_event_on_unwritable_root`) uses monkeypatch on `Path.mkdir` instead of file-as-parent because Windows raises `FileExistsError` (not OSError) when walking up parents through a file, which the production code's retry handler doesn't expect. Cross-platform monkeypatch produces a clean OSError that exercises the bare-except `_fail` path.
- v1 ships only Backup + StorageBackend ABC; CI/CD changes (AD-466d), PostgreSQL backend (AD-466b), observability extensions (AD-466c) all deferred. `.github/workflows/*.yml` files unchanged.

## Pre-Commit Sanity Check

10 files changed, 343 insertions, 1 deletion. Max per-file deletion: 1 line (roadmap status flip). Well under 200-line threshold.
