# PARPOUR Technical Implementation Plan

**Version:** 1.0  
**Last Updated:** 2026-02-23

---

## Phase 1: Foundation (Current)

### 1.1 Database Layer
- [x] SQLAlchemy async configuration
- [ ] Add Alembic migrations
- [ ] Create Event, Workflow, PolicyBundle tables
- [ ] Add database connection pooling

### 1.2 Authentication
- [x] JWT token creation/verification
- [ ] Add role-based access control (RBAC)
- [ ] Add rate limiting (slowapi)
- [ ] Add audit logging

### 1.3 Testing
- [x] API endpoint tests (7 tests)
- [ ] Database integration tests
- [ ] Auth flow tests

---

## Phase 2: Core Features (Next Sprint)

### 2.1 Workflow Management
- [ ] Connect `/workflows` endpoints to database
- [ ] Add workflow state machine
- [ ] Add workflow execution engine
- [ ] Add WebSocket real-time updates

### 2.2 Policy System
- [ ] Connect `/policies` endpoints to database
- [ ] Add policy validation
- [ ] Add tool allowlist enforcement

### 2.3 Event Bus Integration
- [ ] Integrate NATS for event publishing
- [ ] Add event subscriber system
- [ ] Add event replay capability

---

## Phase 3: Production Readiness

### 3.1 Reliability
- [ ] Add health check endpoints
- [ ] Add metrics (Prometheus)
- [ ] Add tracing (OpenTelemetry)
- [ ] Configure graceful shutdown

### 3.2 Security
- [ ] Add API key authentication
- [ ] Add CORS configuration
- [ ] Add request validation
- [ ] Security audit

### 3.3 Performance
- [ ] Add caching layer (Redis)
- [ ] Optimize database queries
- [ ] Add connection pooling tuning
- [ ] Load testing

---

## Architecture

```
┌─────────────────────────────────────────────────────────┐
│                    PARPOUR API                          │
├─────────────────────────────────────────────────────────┤
│  REST Endpoints    │  WebSocket    │  Admin Panel     │
│  - /workflows     │  /ws          │  - Dashboard     │
│  - /policies      │               │  - Analytics     │
│  - /control       │               │                  │
├─────────────────────────────────────────────────────────┤
│  Authentication Layer                                    │
│  - JWT Bearer Tokens                                   │
│  - Role-Based Access Control                          │
│  - Rate Limiting                                      │
├─────────────────────────────────────────────────────────┤
│  Business Logic                                        │
│  - Workflow Engine    │  Policy Engine                 │
│  - Event Bus         │  Ledger Service                │
├─────────────────────────────────────────────────────────┤
│  Data Layer                                          │
│  - PostgreSQL (asyncpg)                               │
│  - Redis (caching)                                   │
│  - NATS (event bus)                                  │
└─────────────────────────────────────────────────────────┘
```

---

## API Endpoints

### Workflows
| Method | Path | Description |
|--------|------|-------------|
| GET | /health | Health check |
| GET | /workflows | List all workflows |
| POST | /workflows | Create workflow |
| GET | /workflows/{id} | Get workflow details |
| PUT | /workflows/{id} | Update workflow |
| DELETE | /workflows/{id} | Delete workflow |
| POST | /workflows/{id}/cancel | Cancel workflow |
| WS | /ws/workflows/{id} | Real-time updates |

### Policies
| Method | Path | Description |
|--------|------|-------------|
| GET | /policies | List policies |
| POST | /policies/publish | Publish policy |
| GET | /policies/{version} | Get policy |

### Control
| Method | Path | Description |
|--------|------|-------------|
| POST | /control/freeze | Freeze system |
| POST | /control/unfreeze | Unfreeze system |

---

## Dependencies

```python
# Core
fastapi>=0.115.0
uvicorn[standard]>=0.32.0

# Database
asyncpg>=0.30.0
sqlalchemy[asyncio]>=2.0.0
alembic>=1.14.0

# Message Bus
nats-py>=0.24.0

# Cache
redis>=5.0.0

# Auth
python-jose[cryptography]>=3.3.0

# Validation
pydantic>=2.10.0

# Observability
opentelemetry-api>=1.25.0
structlog>=24.0.0
```

---

## Testing Strategy

| Type | Coverage Target | Tools |
|------|----------------|-------|
| Unit | 80% | pytest |
| Integration | 100% critical paths | pytest + test DB |
| Contract | API spec compliance | schemathesis |
| Load | Performance benchmarks | k6 |
