🏭 EcoCycle IMS - Multi-Warehouse Inventory Management System

📋 Project Overview

EcoCycle Co. distributes eco-friendly products across multiple warehouse locations throughout Asia. This Multi-Warehouse Inventory Management System (IMS) tracks inventory across all locations, manages stock movements, prevents stockouts, and supports their sustainability mission through carbon footprint tracking and circular economy flows.

🎯 Core Business Problem

EcoCycle struggles with:

• Tracking inventory across multiple Asian warehouses
• Coordinating inter-warehouse transfers
• Preventing stockouts while avoiding overstock
• Measuring carbon impact of their eco-friendly operations
• Managing circular economy flows (recycling, refurbishing)

🏗️ Technical Stack

• Frontend: Next.js 14, TypeScript, Tailwind CSS, React Icons
• Backend: Node.js + Express, Prisma ORM, PostgreSQL (Supabase)
• Auth: JWT authentication via Supabase Auth

🗄️ Database Schema (17 Models)

1. User - Staff authentication & roles
2. Warehouse - Multiple locations with sustainability metrics
3. Product - Eco-friendly products with carbon tracking
4. Category - Product classification hierarchy
5. Inventory - Stock levels per warehouse
6. Transfer + TransferItem - Inter-warehouse movements
7. StockCount - Physical inventory counting
8. Transaction + TransactionItem - Stock movements
9. Order + OrderItem - Customer order fulfillment
10. Supplier + SupplierProduct - Vendor management
11. PurchaseOrder + PurchaseOrderItem - Procurement
12. Delivery + DeliveryItem - Goods receipt tracking
13. CarbonTracking - Carbon impact monitoring
14. RecyclingRecord - Circular economy flows
15. MaterialFlow - Material input/output analysis
16. SystemSetting - Application configuration
17. AuditLog - Change tracking and audit trail

✅ COMPLETED MODULES

Backend Infrastructure

• Express server with TypeScript ✓
• PostgreSQL on Supabase ✓
• Prisma ORM with all 17 models ✓
• Environment configuration ✓
• Router setup ✓

Core Inventory Modules (FULLY COMPLETE)

1. Warehouse Module - Service, Controller, Routes ✓
2. Inventory Module - Service, Controller, Routes ✓
3. Product Module - Service, Controller, Routes ✓
4. Category Module - Service, Controller, Routes ✓

Transaction & Order Modules (FULLY COMPLETE)

5. Transaction Module - Service, Controller, Routes ✓
6. Order Module - Service, Controller, Routes ✓

Supply Chain Modules (FULLY COMPLETE)

7. Supply Chain Module - Service, Controller, Routes ✓
   • Suppliers Management ✓
   • Purchase Orders Management ✓
   • Deliveries Management ✓

Warehouse Operations Modules (COMPLETED)

8. Transfer Module - Service, Controller, Routes ✓

   • Inter-warehouse stock movements
   • Transfer workflow (PENDING → COMPLETED)
   • Stock validation and automatic inventory updates
   • Transfer number generation (TRF-YYYYMM-XXXXX)

9. StockCount Module - Service, Controller, Routes ✓

   • Physical inventory counting
   • Bulk counting support
   • Variance calculation and tracking
   • Workflow (PENDING → REVIEWED → ADJUSTED)
   • Automatic transaction creation on adjustment

Sustainability Modules (NEWLY COMPLETED)

10. Sustainability Module - Service, Controller, Routes ✓

    • Carbon Tracking - /sustainability/carbon

      • Track emissions by scope (SCOPE_1, SCOPE_2, SCOPE_3)
      • Monitor by category (TRANSPORT, ENERGY, WASTE, MATERIALS)
      • Source tracking for warehouses and transfers

    • Recycling Records - /sustainability/recycling

      • Track circular economy flows
      • Record by type (PLASTIC, PAPER, METAL, ELECTRONIC, ORGANIC)
      • Calculate carbon saved and landfill diverted
      • Method tracking (MECHANICAL, CHEMICAL, COMPOSTING)

    • Material Flow - /sustainability/material-flow

      • Track material inputs/outputs
      • Categorize flows (INPUT, OUTPUT, WASTE, RECYCLED)
      • Source and destination tracking
      • Material flow analysis

    • Sustainability Dashboard - /sustainability/dashboard

      • Combined metrics for all sustainability data
      • Warehouse-specific summaries
      • Real-time impact tracking

🔄 IN DEVELOPMENT

1. Authentication Middleware - JWT validation with Supabase
2. Seed Data - Sample data for testing

⬜ PENDING MODULES

Administration Modules

1. User Management Module - Staff authentication & roles (User model)
2. System Settings Module - Application configuration (SystemSetting model)
3. Audit Log Module - Change tracking (AuditLog model)

Analytics & Reports

4. Analytics Module - Stock value, turnover rates
5. Dashboard Module - Main dashboard with KPIs

Integration & Deployment

6. Frontend Integration - Connect Next.js frontend
7. API Documentation - Swagger/OpenAPI docs
8. Testing Suite - Unit and integration tests
9. Deployment Configuration - Docker, CI/CD

📊 PROGRESS SUMMARY

• Total Models: 17
• Completed Modules: 10 (covering 14 models)
• Remaining Models: 3 (User, SystemSetting, AuditLog)
• Completion Status: 82% of backend complete

🔄 API Design Pattern

// Request Body (same for all search endpoints)
{
  "search": "",           // Search term
  "currentPage": 1,       // Page number (1-based)
  "limit": 10,            // Items per page
  "filters": {},          // Table-specific filters
  "sort": {               // Sorting preferences
    "field": "createdAt",
    "order": "desc"       // "asc" or "desc"
  }
}

// Response Pattern
{
  "success": true,
  "data": [...],          // Array of records
  "pagination": {         // Complete pagination metadata
    "currentPage": 1,
    "limit": 10,
    "total": 145,
    "totalPages": 15,
    "hasNext": true,
    "hasPrev": false
  }
}