docs(10-01): complete config backup audit events plan

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.planning/phases/10-audit-observability/10-01-SUMMARY.md

@@ -0,0 +1,98 @@
+---
+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*