{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://openbrandexchange.com/schemas/v0.1/Change.json",
  "type": "object",
  "title": "Change",
  "description": "One entry of the change feed.",
  "properties": {
    "seq": {
      "type": "integer",
      "description": "Node-wide monotonically increasing sequence number of this entry (snapshot entries carry the object's latest seq).",
      "minimum": 1
    },
    "type": {
      "type": "string",
      "enum": [
        "brand",
        "product",
        "variant",
        "asset",
        "grant"
      ],
      "description": "Object type. Consumers MUST ignore entries with unknown types."
    },
    "op": {
      "type": "string",
      "enum": [
        "upsert",
        "delete"
      ],
      "description": "upsert: the object is visible to you with this current state. delete: tombstone, the object is no longer visible to you (deleted, unpublished, parent hidden, outside grant, rights expired)."
    },
    "id": {
      "$ref": "Common.json#/$defs/Id"
    },
    "external_id": {
      "anyOf": [
        {
          "$ref": "Common.json#/$defs/ExternalId"
        },
        {
          "type": "null"
        }
      ]
    },
    "brand_id": {
      "anyOf": [
        {
          "$ref": "Common.json#/$defs/Id"
        },
        {
          "type": "null"
        }
      ]
    },
    "product_id": {
      "anyOf": [
        {
          "$ref": "Common.json#/$defs/Id",
          "description": "Parent product for variant/asset entries."
        },
        {
          "type": "null"
        }
      ]
    },
    "updated_at": {
      "$ref": "Common.json#/$defs/DateTime",
      "description": "upsert: the object's updated_at. delete: when it stopped being visible."
    },
    "data": {
      "description": "Present on upsert (never on delete): the CURRENT representation (Brand, Product without variants/assets, Variant, Asset or Grant according to type).",
      "anyOf": [
        {
          "$ref": "Brand.json"
        },
        {
          "$ref": "Product.json"
        },
        {
          "$ref": "Variant.json"
        },
        {
          "$ref": "Asset.json"
        },
        {
          "$ref": "Grant.json"
        }
      ]
    },
    "resync": {
      "type": "boolean",
      "description": "Only on type=grant: true when your visible set changed; restart /changes without a cursor (full snapshot) and sweep."
    }
  },
  "required": [
    "seq",
    "type",
    "op",
    "id",
    "updated_at"
  ],
  "additionalProperties": false,
  "patternProperties": {
    "^x-[a-z0-9]+-[a-z0-9_-]+$": true
  }
}