{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "title": "changes",
  "type": "object",
  "required": ["published_at", "prev_published_at", "headline", "components", "official",
               "sources_landed", "sources_failed", "gate_holds"],
  "additionalProperties": false,
  "properties": {
    "published_at": {"type": "string"},
    "prev_published_at": {"type": ["string", "null"]},
    "headline": {
      "type": "array",
      "items": {
        "type": "object",
        "required": ["key", "label", "kind", "value", "as_of", "prev_value", "prev_as_of", "delta_pp"],
        "additionalProperties": false,
        "properties": {
          "key": {"type": "string"},
          "label": {"type": "string"},
          "kind": {"enum": ["gauge", "datacenter"]},
          "value": {"$ref": "#/$defs/num"},
          "as_of": {"type": ["string", "null"]},
          "prev_value": {"$ref": "#/$defs/num"},
          "prev_as_of": {"type": ["string", "null"]},
          "delta_pp": {"$ref": "#/$defs/num"}
        }
      }
    },
    "components": {
      "type": "array",
      "items": {
        "type": "object",
        "required": ["component", "label", "mode", "yoy_pct", "prev_yoy_pct", "delta_pp", "bls_yoy_pct"],
        "additionalProperties": false,
        "properties": {
          "component": {"type": "string"},
          "label": {"type": "string"},
          "mode": {"type": ["string", "null"]},
          "yoy_pct": {"$ref": "#/$defs/num"},
          "prev_yoy_pct": {"$ref": "#/$defs/num"},
          "delta_pp": {"$ref": "#/$defs/num"},
          "bls_yoy_pct": {"$ref": "#/$defs/num"}
        }
      }
    },
    "official": {
      "oneOf": [
        {"type": "null"},
        {
          "type": "object",
          "required": ["month", "yoy_pct", "prev_month", "new_print"],
          "additionalProperties": false,
          "properties": {
            "month": {"type": ["string", "null"]},
            "yoy_pct": {"$ref": "#/$defs/num"},
            "prev_month": {"type": ["string", "null"]},
            "new_print": {"type": "boolean"}
          }
        }
      ]
    },
    "sources_landed": {
      "type": "array",
      "items": {
        "type": "object",
        "required": ["source", "new_rows"],
        "additionalProperties": false,
        "properties": {"source": {"type": "string"}, "new_rows": {"type": "integer", "minimum": 1}}
      }
    },
    "sources_failed": {"type": "array", "items": {"type": "string"}},
    "gate_holds": {"type": "array"}
  },
  "$defs": {"num": {"type": ["number", "null"]}}
}