{
    "title": "order_items",
    "type": "object",
    "properties": {
        "id": {
            "type": "integer",
            "description": "Primary key, auto-increment"
        },
        "user_id": {
            "type": "string",
            "description": "User id, system-managed"
        },
        "order_id": {
            "type": "integer",
            "description": "FK to orders.id"
        },
        "product_id": {
            "type": "integer",
            "description": "FK to products.id"
        },
        "product_name": {
            "type": "string",
            "description": "Snapshot of product name at purchase"
        },
        "product_type": {
            "type": "string",
            "description": "Snapshot of product type"
        },
        "variant_label": {
            "type": "string",
            "description": "Selected variant (e.g. Size: L, Color: Red)"
        },
        "unit_price": {
            "type": "number",
            "description": "Unit price at purchase"
        },
        "quantity": {
            "type": "integer",
            "description": "Quantity purchased"
        },
        "line_total": {
            "type": "number",
            "description": "unit_price * quantity"
        },
        "download_url": {
            "type": "string",
            "description": "Digital download URL snapshot"
        },
        "license_key": {
            "type": "string",
            "description": "Issued license key for digital"
        }
    },
    "required": [
        "id",
        "user_id",
        "order_id",
        "product_id",
        "quantity"
    ]
}