{
  "name": "History",
  "base": "PersistedModel",
  "idInjection": true,
  "properties": {
    "refId": {
      "type": "string",
      "required": true
    },
    "collection": {
      "type": "string",
      "required": true
    },
    "timestamp": {
      "type": "date",
      "required": true
    },
    "message": {
      "type": "string",
      "required": false
    },
    "accountId": {
      "type": "string",
      "required": true
    },
    "data": {
      "type": "object",
      "required": true
    },
    "diff": {
      "type": ["object"],
      "required": false
    }
  },
  "options": {
    "strictObjectIDCoercion": true
  },
  "validations": [],
  "acls": [{
    "accessType": "*",
    "principalType": "ROLE",
    "principalId": "$everyone",
    "permission": "DENY"
  }, {
    "accessType": "EXECUTE",
    "principalType": "ROLE",
    "principalId": "editor",
    "permission": "ALLOW"
  }],
  "relations": {
    "account": {
      "type": "belongsTo",
      "model": "Account",
      "foreignKey": "accountId"
    },
    "reference": {
      "type": "belongsTo",
      "polymorphic": {
        "foreignKey": "refId",
        "discriminator": "collection"
      }
    }
  },
  "methods": {},
  "indexes": {
    "version": {
      "keys": {
        "collection": 1,
        "refId": 1
      }
    }
  }
}