{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "type": "object",
  "properties": {
    "subject": {
      "type": "string",
      "enum": [
        "link",
        "target"
      ],
      "description": "link for a monitored placement (source page → destination), target for a monitored destination URL."
    },
    "subjectId": {
      "type": "string",
      "minLength": 1,
      "maxLength": 200,
      "description": "The watch id when subject is link, the target id when subject is target."
    },
    "idempotencyKey": {
      "type": "string",
      "minLength": 1,
      "maxLength": 200,
      "description": "Caller-generated key reused only for retries of the same operation and arguments in this workspace."
    }
  },
  "required": [
    "subject",
    "subjectId",
    "idempotencyKey"
  ],
  "additionalProperties": false
}