final case class EncodedCat(command: Command, token: BinaryData)
final case class Cat(command: Command, token: Token)

final case class Token(issuedAt: Instant, permissions: List[Permission])

sealed trait Command
final case class ImportData(question: String, value: Option[Value]) extends Command

sealed trait Value
final case class NumValue(value: Double) extends Value

sealed trait Permission
final case class AddFactsPermission(caseName: Identifier, questions: List[String]) extends Permission