How I Designed & Tested a Production-Ready SQL Server Database Schema for ERP Systems

Hello Devs! 👋When starting a new ERP project, software teams often spend weeks—if not months—designing, normalizing, and debugging the database structure. Handling concurrent stock movements, preventing negative inventory, and maintaining balanced double-entry accounting records can easily become a headache. To solve this repetitive challenge, I engineered ApexLedger ERP v1.2.0—a fully validated SQL Server database foundation designed for modern enterprise software. ⚙️ Core Architecture HighlightsThe schema covers 21 Tables, 8 DML Triggers, and 55 Indexes split into 4 core modules: Inventory & Stock Protection: Real-time stock movement tracking via automated triggers with built-in negative stock prevention. Finance & General Ledger: Hierarchical Chart of Accounts supporting double-entry Journal Entries with strict Debit/Credit validation. Commercial Trading: Full Sales & Purchase Invoices handling with VAT and discount calculations. Security & Auditability: Fine-grained RBAC paired with an Audit Logging engine that captures user operations and old/new states. 🧪 100% Test Validation (48/48 Passed)To ensure reliability before deployment, the foundation went through 48 automated tests: 15 Functional Tests (Sales/Purchases/Stock) 12 Hardening Tests 21 Security & Integrity Tests Concurrency & Clean Installation Validations 📌 Check out the project on GitHub: https://github.com/waelezzat/ApexLedger-ERP🛒 Commercial License on Gumroad: https://waelezzat.gumroad.com/l/apexledger-erp-v120[cite: 9]I'd love to hear your feedback on the schema design and trigger logic!