---
phase: 09-admin-panel-rearchitecture
plan: "01"
subsystem: backend-api
tags: [admin, overview, fastapi, sqlalchemy, tdd]
dependency_graph:
  requires: []
  provides:
    - "GET /api/admin/overview — aggregate stats + last 10 audit entries"
  affects:
    - backend/api/admin/__init__.py
tech_stack:
  added: []
  patterns:
    - "Sub-router with NO prefix registered on parent APIRouter (D-02 invariant)"
    - "Reuse of _build_filtered_query_with_handles from api.audit for overview data"
key_files:
  created:
    - backend/api/admin/overview.py
    - backend/tests/test_admin_overview.py
  modified:
    - backend/api/admin/__init__.py
decisions:
  - "Import _build_filtered_query_with_handles and _audit_to_dict_with_handles from api.audit directly — no new serializer or query logic duplicated"
  - "Split import lines to satisfy grep acceptance criteria (one import per line for audit helpers)"
  - ".order_by(AuditLog.created_at.desc()) chained before .limit(10) on the query builder result to guarantee newest-first ordering"
metrics:
  duration: "6 minutes"
  completed: "2026-06-12"
  tasks_completed: 2
  tasks_total: 2
  files_created: 2
  files_modified: 1
---

# Phase 09 Plan 01: Admin Overview Endpoint Summary

**One-liner:** New `GET /api/admin/overview` endpoint returning aggregated user count, total storage bytes, per-status document breakdown, and last 10 audit entries in a single admin-protected payload.

## Tasks Completed

| # | Task | Commit | Status |
|---|------|--------|--------|
| 1 | Create Wave 0 xfail test stubs (TDD RED) | `4caeed2` | Done |
| 2 | Implement overview.py + register on admin router (TDD GREEN) | `41d81c0` | Done |

## Files Created

- `backend/api/admin/overview.py` — `GET /api/admin/overview` handler; sub-router with NO prefix; aggregates user_count, total_storage_bytes, doc_status, recent_audit
- `backend/tests/test_admin_overview.py` — 8 tests covering auth guards, aggregate correctness, and sensitive-field scan

## Files Modified

- `backend/api/admin/__init__.py` — added `overview_router` import and `include_router(overview_router)` call

## Test Results

- `pytest tests/test_admin_overview.py` — 8 passed, 0 failed, 0 xfailed
- `pytest tests/test_admin_api.py tests/test_audit.py` — 34 passed, 0 failed (no regressions)
- Total: 42 passed, 0 failed

## Security Invariants Verified

- `GET /api/admin/overview` guarded by `get_current_admin` (raises 401/403)
- Response is a hand-rolled dict with exact keys: `user_count`, `total_storage_bytes`, `doc_status`, `recent_audit`
- Audit entries serialized via `_audit_to_dict_with_handles` whitelist — same security-audited helper used by the audit log viewer
- `test_overview_no_sensitive_fields` scans `resp.text` for `password_hash`, `credentials_enc`, `extracted_text`, `totp_secret`, `api_key_enc` — all absent
- `bandit api/admin/overview.py` — zero HIGH findings

## Deviations from Plan

### Auto-fixed Issues

None — plan executed exactly as written, with one minor adjustment:

**[Rule 2 - Minor] Import split for acceptance criteria compliance**
- The plan's acceptance criteria checks `grep -c "from api.audit import _build_filtered_query_with_handles"` expecting count=1
- Combined import `from api.audit import _build_filtered_query_with_handles, _audit_to_dict_with_handles` would return 0 for that exact pattern
- Split into two separate import lines to satisfy the grep check; functionally equivalent

## Known Stubs

None — all four aggregate fields return live DB query results.

## Threat Flags

None — the new endpoint is within the trust boundary documented in the plan's threat model (T-09-01-01, T-09-01-02, T-09-01-03 all mitigated as designed).

## Self-Check: PASSED

- [x] `backend/api/admin/overview.py` — FOUND
- [x] `backend/tests/test_admin_overview.py` — FOUND
- [x] Commit `4caeed2` (test stubs) — FOUND
- [x] Commit `41d81c0` (implementation) — FOUND
- [x] 8 tests pass, 0 xfailed, 0 failed