mechanic-pwa/docs/superpowers/STATE.md

# Premium Mechanic PWA — Implementation State

> Last updated: 2026-05-17 (end of session 3 — Phase E COMPLETE)

## What is done

| Phase | Task | Status | Artifact |
|---|---|---|---|
| 0 | Git infrastructure (Gitea + repos + feature branches) | ✅ DONE | repos exist, ssh keys configured |
| A | A1: Recon TaxiDashboard backend structure | ✅ DONE | `docs/backend-layout-notes.md` |
| A | A2: Caddy fragment for `mechanic.pptaxi.ru` | ✅ DONE | `ops/Caddyfile.fragment` |
| A | A3: MinIO CORS on `pp-inspections` bucket | ✅ DONE | `ops/set-minio-cors.sh`, applied, preflight 204 |
| A | A4: SQLAlchemy models (`MechanicInspection`, `MechanicInspectionPhoto`, `MechanicDamageMarker`) | ✅ DONE | commit `be0553e` on `feat/mechanic-mvp` |
| B | B1: Mechanic module skeleton + `/healthz` | ✅ DONE | commit `d2113a0` — flat `backend/app/api/mechanic.py` with `APIRouter(prefix="/v1/mechanic")`, registered in `app/main.py` with `prefix="/api"` → final URL `/api/v1/mechanic/healthz` |
| B | B2: SQLAlchemy models registered + tests | ✅ DONE | **already shipped in A4** (`be0553e`) — 38 metadata tests in `backend/tests/test_mechanic_models.py`, no extra B2 commit |
| B | B3: Pydantic schemas | ✅ DONE | commit `2739cc8` + fix `2fb978d` — 14 schemas + 6 Literals in `backend/app/api/mechanic_schemas.py`, 15 behavioral tests in `backend/tests/test_mechanic_schemas.py`; fix added `= None` defaults to `Optional[X]` fields and tightened `MarkerOut.damage_type`/`severity` to `DamageType`/`Severity` Literals |
| B | B4: Auth + DB session dependencies | ✅ DONE | commit `f0d7e83` — `backend/app/api/mechanic_deps.py` re-exports `get_db`+`get_current_user`, adds `require_mechanic` guard (admin OR member of any active `dept_type='svc'` department); 9 tests in `backend/tests/test_mechanic_deps.py` use fake-DB stubs (no real session needed)
| C | C1: `GET /me` endpoint | ✅ DONE | commit `a0bdcaa` + signature fix `1e5b822` — appended to `backend/app/api/mechanic.py`; returns `MeOut` from `require_mechanic` user; `permissions` is `["admin", "mechanic:inspect"]` for admins else `["mechanic:inspect"]`. Test fixtures (`client`, `override_mechanic`, `_fake_user`) in `backend/tests/test_mechanic_endpoints.py` use FastAPI `TestClient` + `app.dependency_overrides` per Option A — no real DB / no async. 6 endpoint tests. |
| C | C2: `GET /vehicles` list with `q`+`limit` search | ✅ DONE | commit `7be8783` — new `backend/app/api/mechanic_service.py` with `search_vehicles_with_last_inspection` (single aggregated subquery + outerjoin to avoid N+1 for last completed inspection per vehicle); endpoint in `mechanic.py`; new `VehicleListResponse` schema; 8 tests (6 endpoint + 2 service-stmt) with `_FakeSession.execute()` returning canned rows. Search hits plate (`CarV2.number`) + VIN only. |
| C | C3: `GET /vehicles/{id}` detail + bound /vehicles limit | ✅ DONE | commit `9109383` + style fix `90b8c66` — new `VehicleDetail(VehicleSummary)` + `InspectionSummary(_Base)` schemas; service `get_vehicle_by_id` + `recent_mechanic_inspections`; endpoint raises 404 when missing, `last_inspection_at` derived from first completed inspection in the list; applied `Query(20, ge=1, le=200)` bounds to C2's `/vehicles` limit param. 7 new tests (5 detail + 2 bounds). Service is now FastAPI-free (404 raise lives in endpoint, matching `automations.py` convention). |
| D-pre | B3 schemas widened from vendor recon (`a187a92`) | ✅ DONE | After read-only recon of `car_inspections` (14k rows, 2yr): `InspectionType` extended 4→9 (added `initial`, `seizure`, `equipment-change`, `pre-repair`, `post-repair`); `DamageType` fully replaced 7→16 (removed `rust`/`glass`/`paint` which had 0 vendor occurrences; added real-world types from vendor distribution: `damaged`, `chip`, `scuff`, `burn`, `bent`, `puncture`, `bulge`, `not-working`, etc.). `Severity` unchanged (4 values, optional — vendor populates only 3%). 2 new positive-coverage tests. Stale comment in `mechanic_damage_marker.py:54` references old DamageType values — fix in Phase F when touching that model. |
| D | D1: `POST /inspections` with inline carry-over markers | ✅ DONE | commits `39a6579` + correctness fix `ee3d370` — service `start_inspection` + `latest_completed_inspection` (with `NULLS LAST` ordering); endpoint returns 201 with full InspectionDetail via re-query with `selectinload(photos, markers)`. Carry-over: copies all **unresolved** markers from prev completed inspection (`resolved=False` filter — closed defects don't reopen), each new marker has `carried_over_from_id=source.id`, `photo_id=None`, `resolved=False`. `_FakeSession` extended with `add`/`flush`/`commit`/`refresh` write-path methods + `rows_per_call` queue for multi-SELECT service flows. 9 new tests (6 endpoint + 3 service). |
| D | D2: `GET /inspections/{id}` with photos+markers | ✅ DONE | commit `1776a81` — service `get_inspection_by_id_with_relations` (selectinload both relationships, `scalar_one_or_none`); endpoint raises 404 with `"inspection not found"` parallel to vehicle's 404. D1's inline re-query block refactored to call the same helper (DRY). 6 new tests (4 endpoint + 2 service introspecting `stmt._with_options`). |
| D | D3: `PATCH /inspections/{id}` status/notes/finished_at | ✅ DONE | commit `aefe117` — service `get_inspection_by_id` (thin `session.get` wrapper) + `patch_inspection` (auto-sets `finished_at=now(UTC)` when status→completed AND finished_at not in payload; `setattr` loop applies all `model_dump(exclude_unset=True)` fields). Endpoint re-loads via `get_inspection_by_id_with_relations` for the response. 8 new tests (6 endpoint + 2 service). Endpoint and service both named `patch_inspection` — disambiguated by module path in code, by `as svc_patch` alias in tests. |
| D | Housekeeping: extract test fakes to `mechanic_fakes.py` | ✅ DONE | commit `eedbf23` — pure refactor. Moved `_FakeResult`, `_FakeSession`, `_fake_user`, `_fake_car`, `_fake_inspection`, `_fake_inspection_orm`, `_fake_marker_orm` from `test_mechanic_endpoints.py` (was 899 lines) to new `backend/tests/mechanic_fakes.py` (207 lines). Test file dropped to 697 lines. Pytest fixtures (`client`, `override_mechanic`, `override_db`) stayed in the test file. Phase E tests will import from `mechanic_fakes` directly. |
| E | E1: MinIO async presigned PUT URL wrapper | ✅ DONE | commit `fe38981` — added `presigned_put_url(bucket, key, *, content_type, expires_sec=300)` to `app/services/storage.py`; `PresignedUploadResponse.fields` defaults to `{}`; 3 storage tests. |
| E | E2: `POST /inspections/{id}/photos/upload-url` | ✅ DONE | commit `111661b` — service `create_pending_photo` + `_storage_key_for_photo` helper in `mechanic_service.py`; endpoint in `mechanic.py` with 415-before-404 guard; UUID4 hex storage keys at `mechanic/inspections/{id}/<uuid>.<ext>`; 9 new tests (7 endpoint + 2 service). |
| E | E3: `POST /photos/{id}/confirm` | ✅ DONE | commit `724b209` — service `get_photo_by_id` + `confirm_photo` (None-safe dim update, status→ready); endpoint verifies `storage.exists`, 409 if missing, 404 covers both photo-missing and inspection-mismatch; 9 new tests (7 endpoint + 2 service). `_fake_photo_orm` factory added to `mechanic_fakes.py`. |
| E | E4: `GET /photos/{id}` + `/thumb` (302 redirect) | ✅ DONE | commit `8361ee1` — auth-guarded 302 to presigned MinIO GET URLs (1h expiry). Thumb endpoint falls back to `storage_key` when `thumb_key is None` so galleries degrade gracefully if E5 task hasn't run yet. 8 endpoint tests. |
| E | E5: async thumbnail generation | ✅ DONE | commit `b37a068` — `generate_and_store_thumbnail` worker (download → Pillow resize to 480px → upload → DB update) with try/except at each step (failures logged, return None, never crashes event loop). Triggered via `asyncio.create_task` from E3 confirm endpoint. `_thumb_key_for` predictable naming (`<key-base>-thumb.jpg`). `pillow_heif.register_heif_opener()` wrapped in try/except for dev-env tolerance. 6 new tests (5 storage unit + 1 endpoint trigger). |

**Branch state:** `feat/mechanic-mvp` at `b37a068`. Full stack: A4 → B1 → B3 + fix → B4 → C1 + fix → C2 → C3 + fix → B3-vendor-align → D1 + fix → D2 → D3 → test-refactor → E1 → E2 → E3 → E4 → E5. All pushed to `origin` (Gitea). See git log for full SHAs.

**Test count on branch:** **144 mechanic tests pass** (38 models + 17 schemas + 9 deps + 9 storage + 71 endpoints) in ~2.5s, no real DB needed. Pillow image-resize tests use real PIL in-memory (verify JPEG magic header + dimensions); thumbnail task end-to-end uses mocked I/O.

**Live mechanic API surface (11 routes):**
- `GET /api/v1/mechanic/healthz`
- `GET /api/v1/mechanic/me`
- `GET /api/v1/mechanic/vehicles?q=&limit=`
- `GET /api/v1/mechanic/vehicles/{vehicle_id}`
- `POST /api/v1/mechanic/inspections` — create with carry-over for type=return
- `GET /api/v1/mechanic/inspections/{inspection_id}` — full detail with photos+markers
- `PATCH /api/v1/mechanic/inspections/{inspection_id}` — partial update + auto finished_at
- `POST /api/v1/mechanic/inspections/{inspection_id}/photos/upload-url` — create pending photo row + presigned PUT URL (5min expiry)
- `POST /api/v1/mechanic/inspections/{inspection_id}/photos/{photo_id}/confirm` — verify upload, mark ready, schedule thumbnail task
- `GET /api/v1/mechanic/photos/{photo_id}` — auth-guarded 302 to presigned GET (1h)
- `GET /api/v1/mechanic/photos/{photo_id}/thumb` — same with thumb_key, falls back to original

### Phase E architecture decisions (RESOLVED 2026-05-17)

| Decision | Choice | Rationale |
|---|---|---|
| Upload pattern | PUT (single presigned URL) not POST/FormData | Simpler PWA code: `fetch(url, {method:'PUT', body:blob})`. `PresignedUploadResponse.fields` defaults to `{}` for future POST migration. |
| Storage key naming | `mechanic/inspections/{insp_id}/<uuid4hex>.<ext>` | Human-readable path + unguessable suffix. UUID4 avoids enumeration. |
| Allowed content types | `image/{jpeg,png,heic,webp}` | Whitelist; 415 on others. |
| Confirm status semantics | `status="ready"` set immediately on confirm; thumb generated async | Frontend doesn't need to poll. Galleries fall back to original via E4 endpoint. |
| Thumbnail backend | `asyncio.create_task` + Pillow (no Celery) | Pillow + 15+ existing fire-and-forget call sites; no broker setup needed. Thumb resize is ~50ms for typical photo — acceptable on event loop. |
| Thumb size | 480px max-edge, JPEG q=85 | Matches `services/download_wazzup_media.py` precedent. |
| Auth model for read URLs | Auth-required on `/photos/{id}` endpoint; presigned URLs themselves bearer-free (1h TTL) | Same as existing `media_proxy.py` convention. |

### Vendor data reality (from recon 2026-05-17 — 14,013 inspections, 2 years)

| Metric | Value | Implication |
|---|---|---|
| Inspections with damage | 1,941 / 14,013 = 13.9% | Most inspections have empty marker list — UI optimize for that |
| Median markers per inspection | 2 | Inline carry-over copy is cheap |
| p95 markers | 10 | Confirms no async needed |
| Max markers | 34 | Worst case still ~50 inserts on commit |
| Median photos per inspection | 11 (`all_photo_ids`) | Includes 9 sides + damage photos |
| Max photos per inspection | 30 | Set MinIO presigned batch size accordingly |
| Carry-over in vendor | **None — denormalized snapshot** | Our `prev_inspection_id`+`carried_over_from_id` FK approach is net improvement |
| Vendor inspection status field | **None — write-once when completed** | Our `in_progress`/`completed`/`cancelled` is greenfield, no conflicts |

## Where things live

### Repos (Gitea: `http://100.64.0.9:3001/tremble7681`)

| Repo | Local clone | Working branch |
|---|---|---|
| `mechanic-pwa` | `c:\NewProject\PremiumDriverApp\` | `feat/mechanic-mvp` |
| `taxi-dashboard` | `c:\NewProject\taxi-dashboard\` | `feat/mechanic-mvp` |

`taxi-dashboard` clone has two remotes: `origin` → Gitea, `vds` → SSH to `/opt/sites/taxi-dashboard/` on 100.64.0.12 (for pulling back-and-forth with prod).

### Reference paths (real, verified — see `docs/backend-layout-notes.md`)

- `Base`, `TimestampMixin` → `app.models.base`
- `get_db` → `app.db` (file: `app/db/__init__.py`)
- `get_current_user` → `app.auth.deps`
- `User` → `app.models.user`
- Auth flow: **OAuth2 password + Bearer JWT** (not PIN as plan originally said)
- DB init: **`Base.metadata.create_all`** at startup (not Alembic) + inline `ALTER TABLE ADD COLUMN IF NOT EXISTS` in `app/main.py` lifespan
- Backend Docker container: `taxi-backend-green` / `taxi-backend-blue` (blue/green)
- MinIO container: `taxi-minio`
- Models registered in: `app/models/__init__.py` (imports + `__all__`)

### Naming clash decision

Existing `app/api/inspections.py` + model `CarInspection` (table `car_inspections`) hold **vendor-imported read-only** data from NaughtySoft. Our new tables use the **`mechanic_`** prefix to coexist:

- `mechanic_inspections` (model `MechanicInspection`)
- `mechanic_inspection_photos` (model `MechanicInspectionPhoto`)
- `mechanic_damage_markers` (model `MechanicDamageMarker`)

### Plan-vs-reality overrides applied in Phase B (Authoritative)

Three places where the original plan (`docs/superpowers/plans/2026-05-16-premium-mechanic-phase1.md`) was overridden during execution because Phase A1 recon showed the codebase doesn't match the plan's assumptions:

| Plan said | Actual implementation | Why |
|---|---|---|
| `backend/app/mechanic/router.py` (subpackage) | `backend/app/api/mechanic.py` (flat) | TaxiDashboard uses flat `app/api/*.py` files; no subpackages |
| `backend/app/mechanic/schemas.py` (subpackage) | `backend/app/api/mechanic_schemas.py` (flat sibling) | Same convention |
| `backend/app/mechanic/deps.py` (subpackage) | `backend/app/api/mechanic_deps.py` (flat sibling) | Same convention |
| Router prefix `/api/v1/mechanic` | Router prefix `/v1/mechanic`, with `app.include_router(..., prefix="/api")` in `main.py` | Matches existing convention (`inspections.py` → `/v2/inspections` + include with `/api`). Final URL is identical: `/api/v1/mechanic/...` |
| `require_mechanic` checks `user.dept.lower() in (...)` | Queries `UserDepartment ⨝ Department WHERE dept_type='svc' AND is_active`, admin shortcuts before DB hit | `User` has no `dept` attribute; departments are M2M via `user_departments`. `DEPT_TYPES=['ops','svc','adm']`, `svc` = service-type (мастерская) |

When dispatching Phase C–F implementers, copy this override map into their context so they don't follow the stale subpackage / dept paths from the plan.

## Phase C testing-infrastructure decision (RESOLVED — Option A in force)

Phase C runs against `FastAPI TestClient` (sync) + `app.dependency_overrides[require_mechanic]` and `app.dependency_overrides[get_db]` to inject fake user / fake session. Fake session is a `SimpleNamespace`-flavored `_FakeSession` class in `tests/test_mechanic_endpoints.py` that supports `.execute(stmt)` (returns `_FakeResult` seeded with rows) and `.get(model, pk)` (returns seeded object or `None`).

No `conftest.py`, no `pytest-asyncio`, no real DB. SQL correctness is deliberately deferred to Phase J e2e.

If Phase D/E/F needs a more complex query shape (e.g. `.scalars().one()` / `.first()`), extend `_FakeResult.scalars()` accordingly — currently it returns `self` and supports only `.all()`. See `test_mechanic_endpoints.py:_FakeResult` docstring.

## Next task

### **Task F1 — Markers CRUD** (Phase F starts; only 2 tasks)

(From `docs/superpowers/plans/2026-05-16-premium-mechanic-phase1.md` Phase F.)

**Working dir:** `c:\NewProject\taxi-dashboard` (branch `feat/mechanic-mvp`, HEAD `b37a068`)

Phase F adds the marker endpoints — finally exposes the carry-over data we've been carefully copying since D1. After F, backend Phase 1 MVP is feature-complete and Phase G begins frontend work.

**Two endpoints:**
- `POST /inspections/{inspection_id}/markers` — create a new damage marker (request: `MarkerCreate` from B3)
- `PATCH /markers/{marker_id}` — update marker (request: `MarkerPatch` from B3)

The plan likely also wants `DELETE /markers/{marker_id}` — verify in the plan. There may also be a "resolve marker" endpoint that's just a PATCH with `resolved=True`.

**Important context:**
- `MechanicDamageMarker` has a stale comment at line 54 (refs old DamageType values like `rust`/`glass`/`paint`) — fix in F1 while touching this model area.
- `MarkerCreate` and `MarkerOut` schemas already exist in `mechanic_schemas.py` from B3.
- The carry-over markers (`carried_over_from_id IS NOT NULL`) deserve a thought: PATCH should be allowed to update them (mechanic confirms the existing damage is still there with current photo); DELETE should probably be NOT allowed on carry-overs (only on freshly-created markers) to preserve audit trail. Verify this in the plan.

**Phase F implementer pattern:** apply the same Phase D path overrides (flat `app/api/`, `MechanicDamageMarker` not `DamageMarker`, etc.). Reuse `_FakeSession` + `_fake_marker_orm` from `mechanic_fakes.py`.

### Phase D architecture decisions (RESOLVED 2026-05-17)

1. **Carry-over: inline в POST /inspections** (atomic in the same transaction). Until carry-over copy completes, the new inspection isn't "ready" for the UI — async would create race conditions and complicate testing without a meaningful payoff for ~10-20 markers per copy.

2. **`_FakeSession` write-path extension.** Add the following to the existing `_FakeSession` in `tests/test_mechanic_endpoints.py`:
   - `add(obj)` — appends to `self.added` list; auto-assigns `obj.id` if not set, popping from `_next_ids` queue if provided, else incrementing `_next_id_counter` (starts at 1000 to avoid collision with test-seeded ids in the 1-99 range)
   - `async flush()` — no-op + `self.flush_count += 1` (ids already assigned in `add`)
   - `async commit()` — no-op + `self.commit_count += 1`
   - `async refresh(obj)` — no-op + `self.refresh_count += 1`
   - **`rows_per_call: Optional[list[Sequence]]`** kwarg — if provided, each `execute()` call pops one item from this queue and returns it as the result rows. This handles multi-query service flows (e.g. `start_inspection` does `select(prev_inspection)` then `select(prev_markers)`).
   - Existing `execute(stmt)` and `get(model, pk)` keep their behavior.
   - All extensions backward-compatible with current 83 tests.

3. **Test infrastructure: stay on Option A, do NOT add real DB.** SQL specifics (selectinload, cascade, JSONB) will be validated in Phase J e2e. aiosqlite ≠ Postgres (JSONB mismatch), testcontainers is too heavy for 3 endpoints, two-paradigm test suite is more pain than gain. Extend the mock instead (see point 2).

### Phase D path overrides (apply to D1, D2, D3)

Same flat-file pattern as Phase B-C; map plan's stale paths:

| Plan says | Use instead |
|---|---|
| `backend/app/mechanic/router.py` | `backend/app/api/mechanic.py` (append) |
| `backend/app/mechanic/service.py` | `backend/app/api/mechanic_service.py` (append) |
| `backend/app/mechanic/schemas.py` | `backend/app/api/mechanic_schemas.py` (already has all needed shapes from B3) |
| `backend/tests/test_mechanic/test_inspections.py` | `backend/tests/test_mechanic_endpoints.py` (append) |
| `Inspection` model | `MechanicInspection` (`app/models/mechanic_inspection`) |
| `DamageMarker` model | `MechanicDamageMarker` (`app/models/mechanic_damage_marker`) |
| `InspectionPhoto` model | `MechanicInspectionPhoto` (`app/models/mechanic_inspection_photo`) |
| `service.get_vehicle_or_404` (plan) | `service.get_vehicle_by_id` + endpoint-level `None`-check + `HTTPException(404)` raise (C3 fix) |
| `from fastapi import HTTPException` inline in service | At endpoint level only; service stays FastAPI-free |
| 404 raise inside endpoint via inline `from fastapi import HTTPException` | Use top-of-file import (already there from C3) |

Pydantic schemas (already shipped in B3):
- `InspectionCreate` (vehicle_id, type, driver_id) — request body for POST
- `InspectionPatch` (status, notes, finished_at) — request body for PATCH
- `InspectionDetail` (full response with photos + markers list) — response model

Phase B3 schemas use `model_config = ConfigDict(from_attributes=True)` via `_Base`, so SQLAlchemy ORM instances serialize automatically with `response_model=InspectionDetail`.

## How to resume in a new session

In a new Claude Code chat in `c:\NewProject\`, paste this prompt:

```
Продолжаем проект Premium Mechanic PWA.

Прочитай PremiumDriverApp/docs/superpowers/STATE.md — там полное состояние и следующая задача.

Phase E полностью завершён (E1-E5, последний коммит b37a068, 144/144 тестов зелёных).
Backend MVP API готов: 11 routes (полный flow inspection + photos + thumbnails).
Следующая фаза — Phase F (markers CRUD, 2 задачи) из плана.

После F backend Phase 1 MVP feature-complete и начинается Phase G (frontend PWA scaffold).

Используй superpowers:subagent-driven-development.
```

That prompt is the **single entry point** for the next session — Claude will read STATE.md, ground itself, and dispatch the F1 implementer.

## Remaining roadmap (Phase 1 MVP)

- ~~**Phase B** (4 tasks)~~ ✅ done — module skeleton, models, schemas, auth deps
- ~~**Phase C** (3 tasks)~~ ✅ done — GET /me, GET /vehicles, GET /vehicles/{id}
- ~~**Phase D** (3 tasks)~~ ✅ done — POST /inspections (+ carry-over), GET /inspections/{id}, PATCH /inspections/{id}
- ~~**Phase E** (5 tasks)~~ ✅ done — presigned PUT URL, photo upload-url, confirm, GET /photos/{id}+thumb, async thumb generation
- **Phase F** (2 tasks): markers create/update/delete ← **NEXT**
- **Phase G** (5 tasks): Vite + React + Tailwind + shadcn + PWA scaffold
- **Phase H** (3 tasks): Login + Home + VehicleCard pages
- **Phase I** (6 tasks): CameraCapture + PhotoSlot + VehicleScheme + InspectionEditor + InspectionReview
- **Phase J** (4 tasks): e2e test + deploy backend + deploy frontend + smoke test

≈ 20 tasks left until MVP live on `mechanic.pptaxi.ru`. Backend MVP is feature-complete after F.

≈ 25 tasks left until MVP live on `mechanic.pptaxi.ru`.

## Known external dependencies

- MinIO `pp-inspections` bucket — CORS already configured, presigned uploads will work
- Caddy on 100.64.0.12 — fragment ready, will be wired during Phase J deploy
- Docker blue/green deployment on VDS — backend re-deployment will need a touch of `docker compose` (Phase J)
- Frontend deployment target: `/opt/sites/mechanic-pwa/dist/` on VDS (Phase J)

## Conventions reminder

- All new code in `feat/mechanic-mvp` branches in both repos
- All new tables use `mechanic_` prefix
- Don't touch existing `app/api/inspections.py` or `app/models/inspection.py` (vendor-imported)
- All new mechanic source lives in **flat files under `backend/app/api/`** with `mechanic_*` naming (`mechanic.py`, `mechanic_schemas.py`, `mechanic_deps.py`). No `app/mechanic/` subpackage — see "Plan-vs-reality overrides" table above.
- Router prefix is `/v1/mechanic`; `/api` is added by `include_router(..., prefix="/api")` in `main.py`. Final URLs always `/api/v1/mechanic/*`.
- Phase C+ endpoint tests: pending the test-infrastructure decision (Option A / B / C above). Do NOT introduce `pytest-asyncio`, `conftest.py`, or a real DB without first resolving that decision.
- `require_mechanic` allows admins + members of any active `Department` with `dept_type='svc'`. Use it as the default auth dep for all mechanic endpoints.