---
id: T03
parent: S01
milestone: M001
provides: []
requires: []
affects: []
key_files: ["backend/main.py", "backend/config.py", "backend/schemas.py", "backend/routers/__init__.py", "backend/routers/health.py", "backend/routers/creators.py", "backend/routers/videos.py"]
key_decisions: ["Health check at /health performs real DB connectivity check via SELECT 1; /api/v1/health is lightweight (no DB)", "Router files in backend/routers/ with prefix-per-router pattern mounted under /api/v1 in main.py"]
patterns_established: []
drill_down_paths: []
observability_surfaces: []
duration: ""
verification_result: "Started PostgreSQL 16-alpine test container on port 5434, ran alembic upgrade head, tested all endpoints via httpx ASGI transport and curl against uvicorn on port 8001. GET /health returns 200 with database=connected. GET /api/v1/creators returns empty list. GET /api/v1/creators/nonexistent returns 404. GET /api/v1/videos returns empty list. OpenAPI docs accessible at /docs."
completed_at: 2026-03-29T21:54:54.506Z
blocker_discovered: false
---

# T03: Built FastAPI app with DB-connected health check, Pydantic schemas for all 7 entities, creators/videos CRUD endpoints, structured logging, and pydantic-settings config

> Built FastAPI app with DB-connected health check, Pydantic schemas for all 7 entities, creators/videos CRUD endpoints, structured logging, and pydantic-settings config

## What Happened
---
id: T03
parent: S01
milestone: M001
key_files:
  - backend/main.py
  - backend/config.py
  - backend/schemas.py
  - backend/routers/__init__.py
  - backend/routers/health.py
  - backend/routers/creators.py
  - backend/routers/videos.py
key_decisions:
  - Health check at /health performs real DB connectivity check via SELECT 1; /api/v1/health is lightweight (no DB)
  - Router files in backend/routers/ with prefix-per-router pattern mounted under /api/v1 in main.py
duration: ""
verification_result: passed
completed_at: 2026-03-29T21:54:54.507Z
blocker_discovered: false
---

# T03: Built FastAPI app with DB-connected health check, Pydantic schemas for all 7 entities, creators/videos CRUD endpoints, structured logging, and pydantic-settings config

**Built FastAPI app with DB-connected health check, Pydantic schemas for all 7 entities, creators/videos CRUD endpoints, structured logging, and pydantic-settings config**

## What Happened

Rewrote backend/main.py to use lifespan context manager with structured logging setup, CORS middleware from pydantic-settings config, and router mounting under /api/v1 prefix. Created backend/config.py with pydantic-settings BaseSettings loading all env vars. Created backend/schemas.py with Pydantic v2 schemas (Base/Create/Read variants) for all 7 entities plus HealthResponse and PaginatedResponse. Built three router modules: health.py (GET /health with real DB SELECT 1 check), creators.py (GET /api/v1/creators with pagination, GET /api/v1/creators/{slug} with video count), and videos.py (GET /api/v1/videos with pagination and optional creator_id filter). All endpoints use async SQLAlchemy sessions via get_session dependency.

## Verification

Started PostgreSQL 16-alpine test container on port 5434, ran alembic upgrade head, tested all endpoints via httpx ASGI transport and curl against uvicorn on port 8001. GET /health returns 200 with database=connected. GET /api/v1/creators returns empty list. GET /api/v1/creators/nonexistent returns 404. GET /api/v1/videos returns empty list. OpenAPI docs accessible at /docs.

## Verification Evidence

| # | Command | Exit Code | Verdict | Duration |
|---|---------|-----------|---------|----------|
| 1 | `curl -s -o /dev/null -w '%{http_code}' http://127.0.0.1:8001/health` | 0 | ✅ pass (HTTP 200) | 500ms |
| 2 | `curl -s http://127.0.0.1:8001/api/v1/creators returns []` | 0 | ✅ pass (HTTP 200, empty list) | 500ms |
| 3 | `curl -s http://127.0.0.1:8001/health database field check` | 0 | ✅ pass (database=connected) | 500ms |
| 4 | `curl -s http://127.0.0.1:8001/api/v1/videos returns []` | 0 | ✅ pass (HTTP 200, empty list) | 500ms |
| 5 | `httpx ASGI transport test — all 5 endpoints` | 0 | ✅ pass | 2000ms |


## Deviations

Added backend/routers/videos.py (not in expected output list but required by plan's endpoint list). Used port 8001 for local testing due to kerf-engine container occupying port 8000.

## Known Issues

None.

## Files Created/Modified

- `backend/main.py`
- `backend/config.py`
- `backend/schemas.py`
- `backend/routers/__init__.py`
- `backend/routers/health.py`
- `backend/routers/creators.py`
- `backend/routers/videos.py`


## Deviations
Added backend/routers/videos.py (not in expected output list but required by plan's endpoint list). Used port 8001 for local testing due to kerf-engine container occupying port 8000.

## Known Issues
None.
