{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "#/components/schemas/InventoryEntry",
  "title": "InventoryEntry",
  "type": "object",
  "description": "An inventory entry tracking available quantity for a specific SKU, optionally scoped to a supply channel.",
  "required": [
    "id",
    "version",
    "sku",
    "quantityOnStock",
    "availableQuantity"
  ],
  "properties": {
    "id": {
      "type": "string",
      "description": "System-generated unique identifier."
    },
    "version": {
      "type": "integer",
      "description": "Current version for optimistic concurrency control."
    },
    "key": {
      "type": "string",
      "description": "User-defined unique identifier."
    },
    "sku": {
      "type": "string",
      "description": "SKU of the product variant this inventory entry tracks."
    },
    "supplyChannel": {
      "$ref": "#/components/schemas/Reference"
    },
    "quantityOnStock": {
      "type": "integer",
      "description": "Total quantity physically in stock."
    },
    "availableQuantity": {
      "type": "integer",
      "description": "Quantity available for ordering (stock minus reservations)."
    },
    "restockableInDays": {
      "type": "integer",
      "description": "Expected days until out-of-stock items are restocked."
    },
    "expectedDelivery": {
      "type": "string",
      "format": "date-time",
      "description": "Expected delivery date for restocking."
    }
  }
}