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+---
+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