@type t() :: %Imp.Clients.ReinforcementSession{
  backend_state: term(),
  current_model: String.t() | nil,
  fulfilled_batch_ids: [term()],
  id: String.t(),
  metadata: map(),
  model: term(),
  pending_batch_ids: [term()],
  provider: atom() | String.t(),
  result_model: String.t() | nil,
  status: atom() | {:unknown, String.t()}
}