{
  "$schema": "https://json-schema.org/draft/2019-09/schema",
  "$id": "http://example.com/example.json",
  "type": "object",
  "default": {},
  "required": [
    "stage",
    "step",
    "previousMessageUnixTimestampInSeconds"
  ],
  "additionalProperties": true,
  "properties": {
    "stage": {
      "type": "string",
      "default": ""
    },
    "step": {
      "type": "number",
      "default": 0
    },
    "previousMessageUnixTimestampInSeconds": {
      "type": "number",
      "default": 0
    },
    "lastMessageSentId": {
      "type": "number",
      "default": 0
    }
  }
}