Multi-Tenant Inventory Management System

A blockchain-powered inventory management platform built for industrial companies, enabling secure multi-tenant operations with role-based access control and supply chain transparency.

🏗️ Architecture

• Backend: NestJS with TypeScript
• Frontend: React with TypeScript
• Blockchain: Flare Network
• Database: PostgreSQL
• Authentication: JWT with role-based access control

🚀 Features

Core Functionality

• Multi-tenant architecture supporting multiple companies
• Role-based access control (Super Admin, Admin, Manager, Supervisor, Employee)
• Real-time inventory tracking and management
• Supply chain traceability via blockchain
• Automated reordering and stock alerts
• Comprehensive reporting and analytics

Blockchain Integration

• Immutable audit trails on Flare Network
• Smart contracts for automated workflows
• Anti-counterfeiting through digital fingerprints
• Cross-company transparency with privacy controls
• Integration with external data sources via Flare oracles

🛠️ Tech Stack

Backend (NestJS)

├── Authentication & Authorization
├── Multi-tenant data isolation
├── RESTful APIs
├── WebSocket for real-time updates
├── Blockchain integration services
├── Background job processing
└── Comprehensive logging & monitoring

Frontend (React)

├── Material-UI / Ant Design components
├── Redux Toolkit for state management
├── React Router for navigation
├── Web3 integration for blockchain
├── Real-time notifications
└── Responsive design

Blockchain (Flare Network)

├── Smart contracts for inventory tracking
├── State Connector for external data
├── FTSO integration for price feeds
├── Multi-signature wallets for companies
└── Event-driven architecture

📋 Prerequisites

• Node.js 18+ and npm/yarn
• PostgreSQL 14+
• Docker & Docker Compose (recommended)
• Flare Network wallet and testnet FLR tokens

⚡ Quick Start

1. Clone the Repository

git clone https://github.com/your-org/inventory-management-system.git
cd inventory-management-system

2. Environment Setup

# Copy environment files
cp backend/.env.example backend/.env
cp frontend/.env.example frontend/.env

# Update configuration values
nano backend/.env
nano frontend/.env

3. Database Setup

# Using Docker (recommended)
docker-compose up -d postgres

# Or install PostgreSQL locally
# Create database: inventory_management

4. Backend Setup

cd backend
npm install

# Run database migrations
npm run migration:run

# Seed initial data
npm run seed

# Start development server
npm run start:dev

5. Frontend Setup

cd frontend
npm install

# Start development server
npm start

6. Blockchain Setup

cd blockchain

# Install dependencies
npm install

# Deploy contracts to Flare testnet
npm run deploy:testnet

# Update contract addresses in backend/.env

📁 Project Structure

inventory-management-system/
├── backend/
│   ├── src/
│   │   ├── auth/           # Authentication & JWT
│   │   ├── companies/      # Multi-tenant management
│   │   ├── users/          # User management & RBAC
│   │   ├── inventory/      # Core inventory logic
│   │   ├── blockchain/     # Flare Network integration
│   │   ├── reports/        # Analytics & reporting
│   │   └── common/         # Shared utilities
│   ├── migrations/         # Database migrations
│   └── seeds/              # Initial data
├── frontend/
│   ├── src/
│   │   ├── components/     # Reusable components
│   │   ├── pages/          # Page components
│   │   ├── services/       # API calls & blockchain
│   │   ├── store/          # Redux store
│   │   └── utils/          # Helper functions
├── blockchain/
│   ├── contracts/          # Solidity smart contracts
│   ├── scripts/            # Deployment scripts
│   └── test/               # Contract tests
└── docs/                   # Documentation

🔐 Authentication & Authorization

User Roles & Permissions

Role	Inventory	Users	Reports	Settings	Blockchain
Super Admin	✅ Full	✅ Full	✅ Full	✅ Full	✅ Full
Admin	✅ Full	✅ Manage	✅ Full	✅ Company	✅ View
Manager	✅ Edit	✅ View	✅ Department	❌	✅ View
Supervisor	✅ Edit	❌	✅ Team	❌	❌
Employee	👁️ View	❌	👁️ Limited	❌	❌

JWT Token Structure

{
  "sub": "user_id",
  "email": "user@company.com",
  "company_id": "company_uuid",
  "roles": ["admin"],
  "permissions": ["inventory:read", "inventory:write"],
  "exp": 1234567890
}

🔗 Blockchain Integration

Smart Contract Functions

// Core inventory tracking
function addItem(string itemId, string metadata) external
function updateItem(string itemId, string metadata) external
function transferItem(string itemId, address to) external

// Supply chain tracking
function recordMovement(string itemId, string location, uint256 timestamp) external
function verifyAuthenticity(string itemId) external view returns (bool)

// Multi-company operations
function grantCompanyAccess(address company, string itemId) external
function revokeCompanyAccess(address company, string itemId) external

Flare Network Features Used

• State Connector: Integration with external inventory systems
• FTSO: Real-time pricing for inventory valuation
• EVM Compatibility: Standard Web3 tooling and libraries
• Low Gas Costs: Cost-effective for high-frequency updates

🗄️ Database Schema

Key Tables

companies          # Multi-tenant company data
users             # User accounts with company association  
roles             # Role definitions and permissions
inventory_items   # Core inventory data
movements         # Item movement history
blockchain_events # Blockchain transaction records
audit_logs        # System audit trail

🔧 Configuration

Backend Environment Variables

# Database
DATABASE_URL=postgresql://user:pass@localhost:5432/inventory_management

# JWT
JWT_SECRET=your-super-secret-key
JWT_EXPIRATION=24h

# Blockchain
FLARE_RPC_URL=https://flare-api.flare.network/ext/C/rpc
PRIVATE_KEY=your-wallet-private-key
CONTRACT_ADDRESS=0x...

# External Services
REDIS_URL=redis://localhost:6379
EMAIL_SERVICE_API_KEY=your-email-api-key

Frontend Environment Variables

REACT_APP_API_BASE_URL=http://localhost:3001/api
REACT_APP_BLOCKCHAIN_NETWORK=flare-testnet
REACT_APP_CONTRACT_ADDRESS=0x...

🧪 Testing

Backend Tests

cd backend

# Unit tests
npm run test

# Integration tests  
npm run test:e2e

# Test coverage
npm run test:cov

Frontend Tests

cd frontend

# Component tests
npm test

# E2E tests with Cypress
npm run cypress:open

Smart Contract Tests

cd blockchain

# Contract unit tests
npm test

# Gas usage analysis
npm run gas-report

🚀 Deployment

Using Docker Compose

# Build and start all services
docker-compose up -d

# View logs
docker-compose logs -f

# Scale services
docker-compose up -d --scale backend=3

Manual Deployment

1. Database: Set up PostgreSQL instance
2. Backend: Deploy NestJS app to cloud provider
3. Frontend: Build React app and deploy to CDN
4. Blockchain: Deploy contracts to Flare mainnet

📊 Monitoring & Observability

• Logging: Structured logging with Winston
• Metrics: Prometheus metrics collection
• Tracing: Distributed tracing with Jaeger
• Alerts: PagerDuty integration for critical issues
• Blockchain Monitoring: Contract event monitoring and alerts

🤝 Contributing

1. Fork the repository
2. Create a feature branch (git checkout -b feature/amazing-feature)
3. Commit your changes (git commit -m 'Add amazing feature')
4. Push to the branch (git push origin feature/amazing-feature)
5. Open a Pull Request

📝 License

This project is licensed under the MIT License - see the LICENSE file for details.

🆘 Support

• Documentation: Full documentation
• API Reference: OpenAPI/Swagger UI
• Issues: GitHub Issues
• Discord: Community Chat

🗺️ Roadmap

Phase 1 - MVP (Current)

• Multi-tenant architecture
• Basic inventory management
• Flare Network integration
• Role-based access control

Phase 2 - Advanced Features

• IoT sensor integration
• Advanced analytics & ML predictions
• Mobile applications
• Integration marketplace

Phase 3 - Enterprise

• Advanced compliance features
• Multi-region deployment
• Advanced blockchain features
• Enterprise SSO integration

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Built with ❤️ for modern supply chain management