{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "#/components/schemas/ProgressTree",
  "title": "ProgressTree",
  "type": "object",
  "required": [
    "name"
  ],
  "properties": {
    "name": {
      "description": "Name of the operation.",
      "type": "string"
    },
    "started_at": {
      "description": "When the operation started.",
      "type": "string",
      "format": "date-time",
      "nullable": true
    },
    "finished_at": {
      "description": "When the operation finished.",
      "type": "string",
      "format": "date-time",
      "nullable": true
    },
    "duration_sec": {
      "description": "For finished operations, how long they took, in seconds.",
      "type": "number",
      "format": "double",
      "nullable": true
    },
    "done": {
      "description": "Number of completed units of work, if applicable.",
      "type": "integer",
      "format": "uint64",
      "minimum": 0,
      "nullable": true
    },
    "total": {
      "description": "Total number of units of work, if applicable and known.",
      "type": "integer",
      "format": "uint64",
      "minimum": 0,
      "nullable": true
    },
    "children": {
      "description": "Child operations.",
      "type": "array",
      "items": {
        "$ref": "#/components/schemas/ProgressTree"
      }
    }
  }
}