# Complete Tech Stack & Deployment Guide - TraceRTM

**Date**: 2025-11-22
**Target**: Production-ready, scalable, cost-optimized SaaS

---

## COMPLETE TECH STACK

### Backend Stack

| Layer | Technology | Version | Purpose |
|-------|-----------|---------|---------|
| **Framework** | FastAPI | 0.115+ | Async web framework |
| **Language** | Python | 3.12+ | Backend language |
| **ORM** | SQLAlchemy | 2.0+ | Database abstraction |
| **Database** | PostgreSQL | 15+ | Primary data store |
| **Vector DB** | pgvector | 0.5+ | Semantic search |
| **Cache** | Redis | 7+ | Session + caching |
| **Message Queue** | NATS | 2.10+ | Pub/sub + RPC |
| **Async Tasks** | Celery | 5.3+ | Background jobs |
| **Validation** | Pydantic | 2.5+ | Data validation |
| **Logging** | Loguru | 0.7+ | Structured logging |
| **Monitoring** | OpenTelemetry | 1.24+ | Observability |
| **Testing** | pytest | 9.0+ | Unit testing |
| **Type Checking** | mypy + basedpyright | Latest | Type safety |
| **Linting** | ruff | 0.14+ | Code quality |

### Frontend Stack

| Layer | Technology | Version | Purpose |
|-------|-----------|---------|---------|
| **Framework** | React | 19+ | UI framework |
| **Language** | TypeScript | 5.3+ | Type-safe JS |
| **Build Tool** | Vite | 5.0+ | Fast bundler |
| **State** | Legend State | 3.0+ | Offline-first state |
| **Server State** | TanStack Query | 5.0+ | Server state mgmt |
| **Storage** | IndexedDB | Native | Local persistence |
| **Styling** | TailwindCSS | 3.4+ | Utility CSS |
| **UI Components** | Headless UI | 1.7+ | Unstyled components |
| **Icons** | Heroicons | 2.0+ | Icon library |
| **Testing** | Vitest | 1.0+ | Unit testing |
| **E2E Testing** | Playwright | 1.40+ | Browser testing |
| **Linting** | ESLint | 8.55+ | Code quality |
| **Formatting** | Prettier | 3.1+ | Code formatting |

### Desktop Stack

| Layer | Technology | Version | Purpose |
|-------|-----------|---------|---------|
| **Framework** | Electron | 28+ | Desktop app |
| **Build** | electron-builder | 24+ | Packaging |
| **Updates** | electron-updater | 6+ | Auto-updates |
| **IPC** | Electron IPC | Native | Process communication |

### Mobile Stack

| Layer | Technology | Version | Purpose |
|-------|-----------|---------|---------|
| **Framework** | React Native | 0.73+ | Mobile framework |
| **Build** | Expo | 50+ | Build service |
| **Storage** | WatermelonDB | 0.26+ | SQLite wrapper |
| **Notifications** | Expo Notifications | Latest | Push notifications |

### Shared Stack

| Layer | Technology | Version | Purpose |
|-------|-----------|---------|---------|
| **API Types** | openapi-typescript | 6.0+ | Type generation |
| **API Client** | openapi-fetch | 0.1+ | Type-safe client |
| **Date Utils** | date-fns | 2.30+ | Date handling |
| **Utilities** | lodash-es | 4.17+ | Utility functions |

### Infrastructure Stack

| Service | Provider | Purpose | Cost |
|---------|----------|---------|------|
| **Database** | Neon | PostgreSQL serverless | $50-200/mo |
| **Cache** | Upstash | Redis serverless | $0-50/mo |
| **Message Queue** | NATS Cloud | Pub/sub | $0-100/mo |
| **Async Tasks** | Inngest | Background jobs | $0-50/mo |
| **Frontend** | Vercel | Web + PWA hosting | $0-100/mo |
| **Desktop** | GitHub | Release hosting | Free |
| **Mobile** | App Store + Play Store | App distribution | $99/year each |
| **Monitoring** | Datadog | Metrics + logs | $0-100/mo |
| **Error Tracking** | Sentry | Exception tracking | $0-50/mo |
| **Uptime** | Pingdom | Health checks | $0-20/mo |

---

## DEPLOYMENT ARCHITECTURE

### Development Setup

```bash
# Clone repo
git clone https://github.com/user/tracertm.git
cd tracertm

# Install dependencies
pnpm install
pip install -e ".[dev]"

# Start services (Docker)
docker-compose up -d

# Run backend
uvicorn src.tracertm.api.main:app --reload

# Run frontend
cd frontend && pnpm dev

# Run tests
pytest tests/
pnpm test
```

### Staging Deployment

**Backend** (Vercel):
```bash
# Deploy FastAPI to Vercel
vercel deploy --prod

# Environment variables
NEON_DATABASE_URL=postgresql://...
UPSTASH_REDIS_URL=redis://...
OPENAI_API_KEY=sk-...
```

**Frontend** (Vercel):
```bash
# Auto-deploy on push to main
# Vercel GitHub integration handles this
```

**Database** (Neon):
```bash
# Create staging database
neon project create tracertm-staging

# Run migrations
alembic upgrade head
```

### Production Deployment

**Backend** (Railway/Render):
```dockerfile
FROM python:3.12-slim

WORKDIR /app
COPY requirements.txt .
RUN pip install -r requirements.txt

COPY src/ src/
CMD ["uvicorn", "src.tracertm.api.main:app", "--host", "0.0.0.0", "--port", "8000"]
```

**Frontend** (Vercel):
```bash
# Production deployment
vercel deploy --prod --token $VERCEL_TOKEN

# Environment
VITE_API_URL=https://api.tracertm.com
```

**Database** (Neon):
```bash
# Production database with HA
neon project create tracertm-prod --region us-east-1

# Enable backups
neon backup enable --retention 30
```

---

## DEPLOYMENT CHECKLIST

### Pre-Deployment

- [ ] All tests passing (100% coverage)
- [ ] No lint errors
- [ ] No type errors
- [ ] Performance benchmarks met
- [ ] Security audit passed
- [ ] Database migrations tested
- [ ] Environment variables configured
- [ ] Secrets stored in vault
- [ ] Monitoring configured
- [ ] Error tracking enabled

### Deployment Steps

1. **Database**
   - [ ] Create backup
   - [ ] Run migrations
   - [ ] Verify schema
   - [ ] Test queries

2. **Backend**
   - [ ] Build Docker image
   - [ ] Push to registry
   - [ ] Deploy to production
   - [ ] Run health checks
   - [ ] Verify API endpoints

3. **Frontend**
   - [ ] Build production bundle
   - [ ] Run lighthouse audit
   - [ ] Deploy to CDN
   - [ ] Verify PWA
   - [ ] Test offline mode

4. **Desktop**
   - [ ] Build Electron app
   - [ ] Sign code
   - [ ] Create release
   - [ ] Test auto-update

5. **Mobile**
   - [ ] Build APK + IPA
   - [ ] Submit to stores
   - [ ] Wait for approval
   - [ ] Release to users

### Post-Deployment

- [ ] Monitor error rates
- [ ] Check performance metrics
- [ ] Verify real-time sync
- [ ] Test offline functionality
- [ ] Monitor database performance
- [ ] Check cache hit rates
- [ ] Verify WebSocket connections
- [ ] Monitor agent activity

---

## MONITORING & OBSERVABILITY

### Key Metrics

**Backend**:
- Request latency (p50, p95, p99)
- Error rate
- Database query time
- Cache hit rate
- WebSocket connections
- Agent activity

**Frontend**:
- Page load time
- Time to interactive
- Cumulative layout shift
- First contentful paint
- Offline sync success rate
- Conflict resolution rate

**Database**:
- Query execution time
- Connection pool usage
- Slow query log
- Replication lag
- Backup status

### Alerting Rules

```yaml
alerts:
  - name: HighErrorRate
    condition: error_rate > 1%
    action: page_oncall

  - name: SlowQueries
    condition: p95_query_time > 1000ms
    action: notify_team

  - name: LowCacheHitRate
    condition: cache_hit_rate < 80%
    action: investigate

  - name: WebSocketDown
    condition: active_connections == 0
    action: page_oncall

  - name: DatabaseDown
    condition: connection_pool_exhausted
    action: page_oncall
```

---

## SCALING STRATEGY

### Phase 1: MVP (0-1000 users)
- Single Vercel deployment
- Neon serverless database
- Upstash Redis
- No caching layer needed

### Phase 2: Growth (1000-10K users)
- Multi-region Vercel
- Database read replicas
- Redis cluster
- CDN for static assets
- Implement caching

### Phase 3: Scale (10K-100K users)
- Dedicated backend servers (Railway)
- PostgreSQL managed service (AWS RDS)
- Redis cluster (Upstash)
- Kafka for events (Upstash)
- Neo4j for complex graphs

### Phase 4: Enterprise (100K+ users)
- Multi-region deployment
- Database sharding
- Dedicated infrastructure
- Custom SLA
- Enterprise support

---

## COST OPTIMIZATION

### Current Costs (MVP)

| Service | Cost | Notes |
|---------|------|-------|
| Neon | $50/mo | Serverless PostgreSQL |
| Upstash | $0/mo | Free tier sufficient |
| Vercel | $0/mo | Free tier sufficient |
| Inngest | $0/mo | Free tier sufficient |
| Datadog | $0/mo | Free tier sufficient |
| **Total** | **$50/mo** | Scales with usage |

### Cost Reduction Strategies

1. **Database**
   - Use connection pooling
   - Archive old events
   - Optimize queries
   - Use materialized views

2. **Cache**
   - Aggressive TTLs
   - Compress data
   - Use Upstash free tier

3. **Compute**
   - Vercel free tier
   - Edge functions
   - Lazy loading

4. **Monitoring**
   - Sample logs (10%)
   - Aggregate metrics
   - Use free tiers

---

## SECURITY CHECKLIST

- [ ] TLS 1.3 for all connections
- [ ] JWT tokens with short expiry
- [ ] Refresh tokens in HTTP-only cookies
- [ ] CORS configured correctly
- [ ] CSRF protection enabled
- [ ] Input validation (Pydantic)
- [ ] SQL injection prevention (ORM)
- [ ] Rate limiting (100 req/min)
- [ ] API key rotation
- [ ] Secrets in vault (not in code)
- [ ] Encryption at rest
- [ ] Audit logging
- [ ] GDPR compliance
- [ ] SOC 2 audit trail

---

## DISASTER RECOVERY

### Backup Strategy

- **Database**: Automated daily backups (Neon)
- **Code**: GitHub (version control)
- **Secrets**: Vault (encrypted)
- **Retention**: 30 days

### Recovery Procedures

1. **Database Failure**
   - Restore from backup
   - Verify data integrity
   - Run migrations
   - Test queries

2. **Service Outage**
   - Switch to backup region
   - Update DNS
   - Notify users
   - Post-mortem

3. **Data Corruption**
   - Restore from backup
   - Identify root cause
   - Implement fix
   - Redeploy

---

## PERFORMANCE TARGETS

| Metric | Target | Current |
|--------|--------|---------|
| API latency (p95) | < 200ms | ? |
| Page load time | < 2s | ? |
| Database query | < 100ms | ? |
| WebSocket latency | < 100ms | ? |
| Offline sync | < 2s | ? |
| Cache hit rate | > 80% | ? |
| Uptime | > 99.9% | ? |


