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Phuoc Nguyen
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SETUP_COMPLETE.md
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SETUP_COMPLETE.md
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# 🎉 NestJS Retail POS Backend - Setup Complete!
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Your complete NestJS backend API for the Retail POS Flutter application has been successfully created!
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---
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## 📦 What's Been Created
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### ✅ **Core Infrastructure**
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- **NestJS Application**: Latest version with TypeScript
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- **PostgreSQL Database**: Complete schema with migrations
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- **Redis Caching**: Ready for performance optimization
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- **JWT Authentication**: Secure token-based auth
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- **Role-Based Access Control (RBAC)**: Admin, Manager, Cashier, User roles
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- **Swagger Documentation**: Auto-generated API docs
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### ✅ **Database Layer**
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- **5 Entities**: User, Category, Product, Transaction, TransactionItem
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- **Initial Migration**: Complete schema with 11 indexes
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- **Seed Data**: Sample categories, products, and users
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- **TypeORM Configuration**: Production-ready setup
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### ✅ **API Modules**
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#### 1. **Auth Module** (`/api/auth`)
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- `POST /auth/register` - Register new user
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- `POST /auth/login` - Login with JWT
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- `GET /auth/profile` - Get current user
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- `POST /auth/refresh` - Refresh token
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#### 2. **Users Module** (`/api/users`)
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- Complete CRUD for user management
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- Admin-only access
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- Password hashing with bcrypt
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#### 3. **Categories Module** (`/api/categories`)
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- `GET /categories` - List all categories (Public)
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- `GET /categories/:id` - Get single category (Public)
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- `GET /categories/:id/products` - Products by category (Public)
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- `POST /categories` - Create category (Admin/Manager)
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- `PUT /categories/:id` - Update category (Admin/Manager)
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- `DELETE /categories/:id` - Delete category (Admin only)
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#### 4. **Products Module** (`/api/products`)
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- `GET /products` - List with pagination, filters, search (Public)
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- `GET /products/:id` - Get single product (Public)
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- `GET /products/category/:categoryId` - By category (Public)
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- `GET /products/search` - Search products (Public)
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- `POST /products` - Create product (Admin/Manager)
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- `PUT /products/:id` - Update product (Admin/Manager)
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- `DELETE /products/:id` - Delete product (Admin only)
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#### 5. **Transactions Module** (`/api/transactions`)
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- `GET /transactions` - List transactions (Cashier+)
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- `GET /transactions/:id` - Get transaction (Cashier+)
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- `POST /transactions` - Create transaction (Cashier+)
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- `GET /transactions/stats` - Statistics (Manager+)
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- `GET /transactions/stats/daily` - Daily sales (Manager+)
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**Features**:
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- ✅ Atomic transaction processing
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- ✅ Stock validation and updates
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- ✅ Automatic tax calculation (10%)
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- ✅ Price snapshots at transaction time
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- ✅ Pessimistic locking for concurrency
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#### 6. **Sync Module** (`/api/sync`)
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- `POST /sync` - Sync all data (Cashier+)
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- `POST /sync/products` - Sync products only (Cashier+)
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- `POST /sync/categories` - Sync categories only (Cashier+)
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- `GET /sync/status` - Get sync status (Cashier+)
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**Features**:
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- ✅ Incremental sync based on timestamps
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- ✅ Offline-first mobile support
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- ✅ Efficient bandwidth usage
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### ✅ **Common Utilities**
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- **DTOs**: Pagination, API Response wrappers
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- **Filters**: HTTP exception handler, catch-all filter
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- **Interceptors**: Logging, response transformation, caching
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- **Pipes**: Global validation pipe
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- **Guards**: JWT auth guard, roles guard
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- **Decorators**: @CurrentUser(), @Public(), @Roles()
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### ✅ **Configuration**
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- **Environment Variables**: `.env` file with dummy data
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- **TypeScript Config**: Strict mode enabled
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- **ESLint & Prettier**: Code formatting
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- **Jest**: Testing framework setup
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### ✅ **Docker Setup**
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- **Dockerfile**: Multi-stage build for production
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- **docker-compose.yml**: Complete stack (API, PostgreSQL, Redis, pgAdmin)
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- **.dockerignore**: Optimized build context
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---
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## 🚀 Quick Start
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### **Option 1: Local Development**
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#### 1. Create Database
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```bash
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# Using psql
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createdb retail_pos
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# Or using Docker
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docker-compose up -d postgres redis
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```
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#### 2. Configure Environment
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The `.env` file is already created with dummy data. Update these values:
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```bash
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DB_HOST=localhost
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DB_PORT=5432
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DB_USERNAME=postgres
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DB_PASSWORD=postgres # Change this!
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DB_DATABASE=retail_pos
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JWT_SECRET=retail-pos-super-secret-key-change-in-production-2025 # Change this!
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```
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#### 3. Run Migrations
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```bash
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npm run migration:run
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```
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#### 4. Seed Database (Optional)
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```bash
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npm run seed:run
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```
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This creates:
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- **Categories**: 6 retail categories (Electronics, Clothing, Food, etc.)
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- **Products**: 14 sample products
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- **Users**:
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- Admin: `admin@retailpos.com` / `Admin123!`
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- Manager: `manager@retailpos.com` / `Manager123!`
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- Cashier: `cashier@retailpos.com` / `Cashier123!`
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#### 5. Start Server
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```bash
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# Development mode with hot-reload
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npm run start:dev
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# Production mode
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npm run build
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npm run start:prod
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```
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#### 6. Access Application
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- **API**: http://localhost:3000/api
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- **Swagger Docs**: http://localhost:3000/api/docs
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- **Health Check**: http://localhost:3000/health
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---
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### **Option 2: Docker Deployment**
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#### Start All Services
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```bash
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# Start API, PostgreSQL, Redis
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docker-compose up -d
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# View logs
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docker-compose logs -f api
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# Include pgAdmin for database management
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docker-compose --profile tools up -d
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```
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#### Run Migrations in Docker
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```bash
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docker-compose exec api npm run migration:run
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docker-compose exec api npm run seed:run
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```
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#### Access Services
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- **API**: http://localhost:3000/api
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- **Swagger**: http://localhost:3000/api/docs
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- **pgAdmin**: http://localhost:5050 (admin@retailpos.com / admin123)
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- **PostgreSQL**: localhost:5432
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- **Redis**: localhost:6379
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---
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## 🔐 Test the API
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### 1. Login to Get Token
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```bash
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curl -X POST http://localhost:3000/api/auth/login \
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-H "Content-Type: application/json" \
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-d '{"email": "admin@retailpos.com", "password": "Admin123!"}'
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```
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**Response**:
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```json
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{
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"access_token": "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9...",
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"user": {
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"id": "uuid",
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"email": "admin@retailpos.com",
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"name": "Admin User",
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"roles": ["admin"]
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}
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}
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```
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### 2. List Products (Public)
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```bash
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curl http://localhost:3000/api/products
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```
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### 3. Create Product (Auth Required)
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```bash
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curl -X POST http://localhost:3000/api/products \
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-H "Authorization: Bearer YOUR_TOKEN" \
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-H "Content-Type: application/json" \
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-d '{
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"name": "Gaming Mouse",
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"price": 49.99,
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"categoryId": "CATEGORY_UUID",
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"stockQuantity": 100
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}'
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```
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### 4. Create Transaction
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```bash
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curl -X POST http://localhost:3000/api/transactions \
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-H "Authorization: Bearer YOUR_TOKEN" \
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-H "Content-Type: application/json" \
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-d '{
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"items": [
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{"productId": "PRODUCT_UUID", "quantity": 2}
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],
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"paymentMethod": "cash",
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"discount": 5.00
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}'
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```
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---
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## 📚 Project Structure
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```
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retail-nest/
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├── src/
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│ ├── common/ # Global utilities
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│ │ ├── decorators/ # @CurrentUser, @Public, @Roles
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│ │ ├── dto/ # PaginationDto, ApiResponseDto
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│ │ ├── filters/ # Exception handlers
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│ │ ├── guards/ # JWT, Roles guards
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│ │ ├── interceptors/ # Logging, Transform, Cache
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│ │ └── pipes/ # Validation pipe
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│ ├── config/ # Configuration modules
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│ │ ├── app.config.ts
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│ │ ├── database.config.ts
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│ │ ├── jwt.config.ts
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│ │ └── redis.config.ts
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│ ├── database/
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│ │ ├── migrations/ # TypeORM migrations
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│ │ └── seeds/ # Database seeds
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│ ├── modules/
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│ │ ├── auth/ # Authentication
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│ │ ├── users/ # User management
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│ │ ├── categories/ # Category API
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│ │ ├── products/ # Product API
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│ │ ├── transactions/ # Transaction API
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│ │ └── sync/ # Mobile sync API
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│ ├── app.module.ts
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│ └── main.ts
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├── test/ # Unit & E2E tests
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├── .env # Environment variables
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├── .env.example # Environment template
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├── Dockerfile # Production Docker image
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├── docker-compose.yml # Full stack setup
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└── package.json
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```
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---
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## 🎯 Key Features
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### Security
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✅ JWT authentication with refresh tokens
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✅ Password hashing with bcrypt (10 rounds)
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✅ Role-based access control (RBAC)
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✅ Rate limiting (100 req/min)
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✅ CORS protection
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✅ Helmet security headers
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### Performance
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✅ Redis caching layer
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✅ Database query optimization with indexes
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✅ Pessimistic locking for transactions
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✅ Pagination for large datasets
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✅ Response compression (gzip)
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### Data Integrity
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✅ Database transactions for critical operations
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✅ Foreign key constraints
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✅ Unique constraints
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✅ Stock validation before transactions
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✅ Price snapshots in transactions
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### Developer Experience
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✅ Swagger/OpenAPI documentation
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✅ TypeScript with strict mode
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✅ Hot-reload in development
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✅ Docker support for easy deployment
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✅ Comprehensive error handling
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---
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## 🧪 Available Scripts
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```bash
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# Development
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npm run start:dev # Start with hot-reload
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npm run start:debug # Start with debugger
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# Production
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npm run build # Build for production
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npm run start:prod # Run production build
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# Database
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npm run migration:generate # Generate migration
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npm run migration:create # Create empty migration
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npm run migration:run # Run migrations
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npm run migration:revert # Revert last migration
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npm run seed:run # Seed database
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# Testing
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npm run test # Run unit tests
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npm run test:watch # Watch mode
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npm run test:cov # With coverage
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npm run test:e2e # E2E tests
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# Code Quality
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npm run lint # Lint code
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npm run format # Format with Prettier
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```
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---
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## 🔧 Environment Variables
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All required environment variables are in `.env` (already created):
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```bash
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# Application
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NODE_ENV=development
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PORT=3000
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API_PREFIX=api
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# Database
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DB_HOST=localhost
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DB_PORT=5432
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DB_USERNAME=postgres
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DB_PASSWORD=postgres
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DB_DATABASE=retail_pos
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# JWT
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JWT_SECRET=your-secret-key-here
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JWT_EXPIRES_IN=1d
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# Redis
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REDIS_HOST=localhost
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REDIS_PORT=6379
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CACHE_TTL=300
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# CORS
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CORS_ORIGIN=http://localhost:3000,capacitor://localhost
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# Rate Limiting
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THROTTLE_TTL=60
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THROTTLE_LIMIT=100
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# Security
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BCRYPT_ROUNDS=10
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```
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---
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## 📖 API Documentation
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### Access Swagger UI
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Once the server is running, visit:
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- **Swagger UI**: http://localhost:3000/api/docs
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- **OpenAPI JSON**: http://localhost:3000/api/docs-json
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### Default Users
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| Role | Email | Password |
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|------|-------|----------|
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| Admin | admin@retailpos.com | Admin123! |
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| Manager | manager@retailpos.com | Manager123! |
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| Cashier | cashier@retailpos.com | Cashier123! |
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---
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## 🎨 Response Format
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All API responses follow a consistent format:
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### Success Response
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```json
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{
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"success": true,
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"data": { /* your data */ },
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"message": "Operation successful"
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}
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```
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### Paginated Response
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```json
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{
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"success": true,
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"data": [ /* items */ ],
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"meta": {
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"page": 1,
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"limit": 20,
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"total": 100,
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"totalPages": 5
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}
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}
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```
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### Error Response
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```json
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{
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"success": false,
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"error": {
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"statusCode": 400,
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"message": "Validation failed",
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"details": ["error details"]
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},
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"timestamp": "2025-10-10T12:00:00.000Z",
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"path": "/api/products"
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}
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```
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---
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## 🚀 Next Steps
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### 1. **Update Environment Variables**
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Edit `.env` file with your actual database credentials and JWT secret.
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### 2. **Run Migrations**
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```bash
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npm run migration:run
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```
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### 3. **Seed Database**
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```bash
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npm run seed:run
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```
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### 4. **Start Development Server**
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```bash
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npm run start:dev
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```
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### 5. **Test API**
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Visit http://localhost:3000/api/docs to test endpoints.
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### 6. **Integrate with Flutter App**
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- Update Flutter app API base URL to `http://localhost:3000/api`
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- Use JWT token from login response for authenticated requests
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- Implement offline sync using `/api/sync` endpoints
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---
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## 📝 Additional Documentation
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Created documentation files:
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- `DATABASE_SETUP.md` - Complete database guide
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- `DATABASE_SUMMARY.md` - Quick database reference
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- `AUTH_SYSTEM.md` - Authentication system details
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- `IMPLEMENTATION_SUMMARY.md` - Implementation guide
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---
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## ✨ What Makes This Production-Ready
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✅ **Security First**: JWT auth, bcrypt hashing, RBAC, rate limiting
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✅ **Scalable Architecture**: Modular design, dependency injection
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✅ **Performance Optimized**: Redis caching, database indexes, query optimization
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✅ **Data Integrity**: Transactions, constraints, stock validation
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✅ **Developer Friendly**: Swagger docs, TypeScript, hot-reload
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✅ **Docker Ready**: Multi-stage builds, docker-compose stack
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✅ **Testing Ready**: Jest setup, unit & E2E test structure
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✅ **Mobile Ready**: Sync API for offline-first Flutter app
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---
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## 🎉 You're All Set!
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Your NestJS Retail POS Backend is **production-ready** and waiting for you to:
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1. Update `.env` with your credentials
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2. Run migrations: `npm run migration:run`
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3. Seed data: `npm run seed:run`
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4. Start server: `npm run start:dev`
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5. Open Swagger: http://localhost:3000/api/docs
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**Happy coding!** 🚀
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Reference in New Issue
Block a user