{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "title": "sources_status",
  "type": "object",
  "required": ["generated_at", "sources"],
  "additionalProperties": false,
  "properties": {
    "generated_at": {"type": "string"},
    "sources": {
      "type": "array",
      "items": {
        "type": "object",
        "required": ["name", "route", "cadence", "ok", "fetched", "new_rows",
                     "error", "finished_at", "series_count", "latest_obs"],
        "additionalProperties": false,
        "properties": {
          "name": {"type": "string"},
          "route": {"type": "string"},
          "cadence": {"type": "string"},
          "ok": {"type": "boolean"},
          "fetched": {"type": "integer"},
          "new_rows": {"type": "integer"},
          "error": {"type": ["string", "null"]},
          "finished_at": {"type": "string"},
          "series_count": {"type": "integer"},
          "latest_obs": {"type": ["string", "null"]}
        }
      }
    }
  }
}