{
  "type": "object",
  "additionalProperties": false,
  "required": [
    "schema_version",
    "evidence_id",
    "evidence_kind",
    "ticket_id",
    "producer_role",
    "created_at",
    "payload"
  ],
  "properties": {
    "schema_version": { "const": 1 },
    "evidence_id": {
      "type": "string",
      "pattern": "^[a-z0-9](?:[a-z0-9-]{0,62}[a-z0-9])?$"
    },
    "evidence_kind": {
      "type": "string",
      "pattern": "^[a-z0-9](?:[a-z0-9-]{0,62}[a-z0-9])?$"
    },
    "ticket_id": {
      "type": ["string", "null"],
      "pattern": "^[a-z0-9](?:[a-z0-9-]{0,62}[a-z0-9])?$"
    },
    "producer_role": {
      "type": "string",
      "pattern": "^[a-z0-9](?:[a-z0-9.-]{0,126}[a-z0-9])?$"
    },
    "created_at": {
      "type": "string",
      "pattern": "^[0-9]{4}-[0-9]{2}-[0-9]{2}T[0-9]{2}:[0-9]{2}:[0-9]{2}(?:\\.[0-9]{1,3})?Z$"
    },
    "payload": { "type": "object" }
  }
}