{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "type": "array",
  "items": {
    "type": "object",
    "additionalProperties": false,
    "required": ["filename", "size_bytes", "modified_at"],
    "properties": {
      "filename": { "type": "string" },
      "size_bytes": { "type": "integer", "minimum": 0 },
      "modified_at": { "type": ["string", "null"] }
    }
  }
}