ERP System — Inventory & Supply Chain (Phase 1)

A modular ERP built in phases. Phase 1 delivers Inventory & Supply Chain: master data, procurement, goods receipt, and stock management with FIFO costing, multi-warehouse, single-tenant.

Monorepo: a .NET 10 REST API backend and a Next.js frontend, with all documentation under docs/.

Repository layout

erp-monorepo/
├── Backend/      # ASP.NET Core Web API (.NET 10, PostgreSQL) + PROGRESS.md
├── Frontend/     # Next.js (App Router, TypeScript) + PROGRESS.md
└── docs/         # all documentation — START AT docs/00-CORE.md

Start here

All work begins at docs/00-CORE.md — the hub. It defines structure, tech stack, backend setup, and routes you to the right doc.

Doc	Purpose
docs/00-CORE.md	Hub: structure, stack, backend init, routing
docs/01-DOC-GUIDE.md	Doc map, reading order, tracking conventions
docs/10-BACKEND-PHASE1.md	Backend spec: SRS + ER model + architecture
docs/11-BACKEND-PHASE1.md	Backend API reference (complete req/res)
docs/20-FRONTEND.md	Frontend user-flows + rules + validation posture
Backend/PROGRESS.md, Frontend/PROGRESS.md	Change checklists (git-shared)

Prerequisites

• .NET 10 SDK (dotnet --version → 10.0.x)
• PostgreSQL running on localhost
• dotnet-ef tool (dotnet tool install --global dotnet-ef)
• Node.js (for the frontend)

Run the backend

# create the database in your local Postgres first, e.g.:
#   createdb -U postgres ERPCore   (or: CREATE DATABASE "ERPCore"; in psql)
cd Backend/ERPCore
# set Username/Password in appsettings.Development.json to your local Postgres login
dotnet ef database update
dotnet run

• Swagger UI: https://localhost:<port>/swagger
• Health: https://localhost:<port>/health → Healthy

Full setup (packages, folder scaffold, Program.cs wiring) is in docs/00-CORE.md §5.

Run the frontend

cd Frontend
cp .env.local.example .env.local      # set NEXT_PUBLIC_API_BASE_URL=https://localhost:<port>
npm install
npm run dev

Configuration & secrets

• Three appsettings files: base (appsettings.json, placeholders only), Development (localhost), Production (env vars).
• Local dev only currently. Before any shared/staging/production use, move secrets to User Secrets (dev) and environment variables (prod), keep appsettings.Development.json / appsettings.Production.json out of git, and rotate any credential ever committed.

Tech stack

Backend: .NET 10, ASP.NET Core Web API, EF Core 10, PostgreSQL (Npgsql), JWT bearer auth, Serilog, Swashbuckle/Swagger, HealthChecks. Layering: Controller → Service → Repository → UnitOfWork, DTOs at the controller boundary, FIFO in a domain service. Frontend: Next.js (App Router) + TypeScript, plain React hooks, dependency-free validation (client for UX; server is authoritative).

Conventions

• Documentation: one source of truth per topic; edit in place; navigate from docs/00-CORE.md.
• Progress: update the relevant PROGRESS.md in the same commit as the code (docs/01-DOC-GUIDE.md §6).

Roadmap (future phases)

Sales & CRM · Manufacturing & Production · QC/QA · Accounting · HRM. Phase 1 reserves the integration seams (GL-ready journal entries, reservation status, goods-issue movement, inspection hold, user identity) so later phases integrate without a schema migration.