Inventory Management Database Design

What this template is for

This inventory management database design gives you a ready-to-edit ER diagram for tracking stock across products, warehouses, and suppliers. It models the core entities of any inventory system: a product catalog organized by category, warehouses that hold stock, a stock table that records quantity and reorder levels per product per warehouse, and a stock movement log that captures every receipt and dispatch tied to a supplier. Use it to design a new inventory system, document an existing one, or explain how reorder levels and stock movements relate before you write a single migration.

When to use this template

• Design the schema for a new inventory or warehouse management system.
• Model multi-warehouse stock so the same product can have different quantities per location.
• Plan a stock movement log that distinguishes receipts, dispatches, and adjustments.
• Decide where reorder levels live and how low-stock alerts will query them.
• Document an existing inventory database for a new engineer joining the team.
• Explain to stakeholders how suppliers connect to stock movements.

How to use it

1. 1Start with the Product table and link it to a Category for organization.
2. 2Add a Warehouse table — each warehouse holds stock independently.
3. 3Add a Stock table keyed by product + warehouse, holding quantity and reorder level.
4. 4Add a StockMovement table to log every in/out change with a type and timestamp.
5. 5Link StockMovement to Supplier so each receipt records where the stock came from.
6. 6Add cardinality: one product has many stock rows; one stock row has many movements.

Quick example