Product Inventory API

Build a product inventory management API with FastAPI and Python. The API tracks products and stock adjustments.

Endpoints

• POST /api/products -- create a product with name: str, sku: str, price: float (> 0), quantity: int (>= 0)
• GET /api/products -- list all products, with optional query params min_price: float, max_price: float, in_stock: bool
• GET /api/products/{product_id} -- get product by ID
• PUT /api/products/{product_id} -- update product details
• POST /api/products/{product_id}/adjust-stock -- adjust stock with adjustment: int (positive to add, negative to remove), reason: str
• GET /api/products/{product_id}/stock-history -- get stock adjustment history for a product

Business rules:

• SKU must be unique
• Stock cannot go below zero after an adjustment
• Price must be positive
• Reason is required for stock adjustments

Output

Produce Python files:

• app/main.py -- FastAPI app with routes
• app/models.py -- Pydantic models
• app/storage.py -- in-memory storage (no real database)

Do not include test files or deployment configuration.