# Deployment Fixes Summary - 2026-03-20

## 🚨 Issues Encountered

### Backend Build Failures
1. **Missing `ms` package**
   - Error: `Cannot find module 'ms' or its corresponding type declarations`
   - Impact: Auth module couldn't build

2. **Missing `CACHE_MANAGER` dependency**
   - Error: `Nest can't resolve dependencies of the UserService`
   - Impact: UserModule and AuthModule failed to start

3. **Missing `UuidResolverService`**
   - Error: `Nest can't resolve dependencies of the UserService`
   - Impact: UUID resolution failed across modules

### Frontend Docker Build Failures
1. **Next.js standalone build with pnpm**
   - Error: `ENOENT: no such file or directory` creating standalone node_modules
   - Impact: Docker build failed

---

## 🔧 Solutions Implemented

### Backend Fixes

#### 1. Add Missing Dependencies
```json
// package.json
{
  "dependencies": {
    "ms": "^2.1.3"
  },
  "devDependencies": {
    "@types/ms": "^2.1.0"
  }
}
```

#### 2. Global Cache Configuration
```typescript
// app.module.ts
import { CacheModule } from '@nestjs/cache-manager';

@Module({
  imports: [
    // Global cache for all modules
    CacheModule.register({
      isGlobal: true,
      ttl: 300, // 5 minutes
    }),
    // ... other modules
  ],
})
```

#### 3. CommonModule Import
```typescript
// app.module.ts
import { CommonModule } from './common/common.module';

@Module({
  imports: [
    CommonModule, // Initialize global services
    // ... other modules
  ],
})
```

### Frontend Docker Fixes

#### 1. Disable Standalone Mode
```javascript
// next.config.mjs
const nextConfig = {
  // TEMPORARILY DISABLED: pnpm standalone build issues
  // output: "standalone",
};
```

#### 2. Update Dockerfile
```dockerfile
# Copy full app instead of standalone
COPY --from=build --chown=nextjs:nextjs /w/frontend ./
COPY --from=build --chown=nextjs:nextjs /w/frontend/node_modules ./node_modules

# Use pnpm start instead of node server.js
CMD ["pnpm", "start"]
```

---

## 📊 Impact Assessment

### Backend
- ✅ All dependency injection issues resolved
- ✅ Cache manager available globally
- ✅ UUID resolver service accessible
- ✅ Build time: ~21s (successful)

### Frontend
- ✅ Docker build successful
- ⚠️ Image size increased (no standalone optimization)
- ✅ Build time: ~51s (successful)

---

## 🔄 Future Improvements

### Backend
1. **Redis Cache Integration**
   - Replace in-memory cache with Redis store
   - Resolve `cache-manager-redis-store` TypeScript issues
   - Enable distributed caching

### Frontend
1. **Standalone Build Recovery**
   - Fix pnpm symlink compatibility
   - Re-enable `output: "standalone"`
   - Optimize Docker image size

---

## ✅ Verification Checklist

- [x] Backend builds without errors
- [x] Backend starts successfully
- [x] All modules can inject dependencies
- [x] Frontend builds without errors
- [x] Frontend Docker build succeeds
- [x] No TypeScript errors
- [x] No missing dependencies

---

**Status**: ✅ DEPLOYMENT READY  
**Updated**: 2026-03-20  
**Next Review**: After Redis cache integration
