{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "title": "Message",
  "type": "object",
  "additionalProperties": false,
  "properties": {
    "id": {
      "type": "string",
      "format": "uuid"
    },
    "conversation_id": {
      "type": "string",
      "format": "uuid"
    },
    "role": {
      "type": "string"
    },
    "content": {
      "type": "string"
    },
    "token_count": {
      "type": "integer",
      "minimum": 0
    },
    "model_tag": {
      "type": "string"
    },
    "inference_time_ms": {
      "type": "integer",
      "minimum": 0
    },
    "created_at": {
      "type": "string",
      "format": "date-time"
    }
  },
  "required": [
    "id",
    "conversation_id",
    "role",
    "content",
    "token_count",
    "model_tag",
    "inference_time_ms",
    "created_at"
  ]
}