---
phase: 10-audit-observability
plan: 01
subsystem: api
tags: [audit, logging, config-backup, nats, observability]

# Dependency graph
requires:
  - phase: 03-snapshot-ingestion
    provides: config_snapshot_subscriber handle_config_snapshot handler
  - phase: 05-config-diff
    provides: config_diff_service generate_and_store_diff function
  - phase: 04-manual-backup-trigger
    provides: config_backups trigger_config_snapshot endpoint
provides:
  - Audit trail for all config backup operations (4 event types)
  - Tests verifying audit event emission
affects: []

# Tech tracking
tech-stack:
  added: []
  patterns: [try/except-wrapped log_action calls for fire-and-forget audit, inline imports in diff service to avoid circular deps]

key-files:
  created:
    - backend/tests/test_audit_config_backup.py
  modified:
    - backend/app/services/config_snapshot_subscriber.py
    - backend/app/services/config_diff_service.py
    - backend/app/routers/config_backups.py

key-decisions:
  - "Module-level import of log_action in snapshot subscriber (no circular risk), inline import in diff service and router (consistent with existing best-effort pattern)"
  - "All audit calls wrapped in try/except Exception: pass to never break parent operations"

patterns-established:
  - "Audit event pattern: try/except-wrapped log_action calls at success points in NATS subscribers and API endpoints"

requirements-completed: [OBS-01, OBS-02]

# Metrics
duration: 3min
completed: 2026-03-13
---

# Phase 10 Plan 01: Config Backup Audit Events Summary

**Four audit event types (created, skipped_duplicate, diff_generated, manual_trigger) wired into config backup operations with try/except safety and 4 passing tests**

## Performance

- **Duration:** 3 min
- **Started:** 2026-03-13T04:43:11Z
- **Completed:** 2026-03-13T04:46:04Z
- **Tasks:** 2
- **Files modified:** 4

## Accomplishments
- Added audit logging to all 4 config backup operations: snapshot creation, deduplication skip, diff generation, and manual backup trigger
- All log_action calls follow project pattern: try/except wrapped, fire-and-forget, with tenant_id, device_id, action, resource_type, and details
- 4 new tests verify correct audit action strings are emitted, all 17 tests pass (4 new + 13 existing)

## Task Commits

Each task was committed atomically:

1. **Task 1: Add audit event emission to snapshot subscriber, diff service, and backup trigger endpoint** - `1a1ceb2` (feat)
2. **Task 2: Add tests verifying audit events are emitted** - `fb91fed` (test)

## Files Created/Modified
- `backend/app/services/config_snapshot_subscriber.py` - Added config_snapshot_created and config_snapshot_skipped_duplicate audit events
- `backend/app/services/config_diff_service.py` - Added config_diff_generated audit event after diff INSERT
- `backend/app/routers/config_backups.py` - Added config_backup_manual_trigger audit event on manual trigger success
- `backend/tests/test_audit_config_backup.py` - 4 tests verifying all audit event types are emitted

## Decisions Made
- Module-level import of log_action in snapshot subscriber (no circular dependency risk since audit_service has no deps on snapshot subscriber)
- Inline import in diff service try block (consistent with existing best-effort pattern and avoids any potential circular import)
- Inline import in config_backups router try block (same pattern as diff service)

## Deviations from Plan

None - plan executed exactly as written.

## Issues Encountered
None

## User Setup Required
None - no external service configuration required.

## Next Phase Readiness
- Audit trail complete for all config backup operations
- All existing tests continue to pass with the new audit imports

---
*Phase: 10-audit-observability*
*Completed: 2026-03-13*