@type t() :: %LabelingIR.Label{
  assignment_id: String.t(),
  created_at: DateTime.t(),
  id: String.t(),
  lineage_ref: LabelingIR.Types.lineage_ref() | nil,
  metadata: map(),
  namespace: String.t() | nil,
  notes: String.t() | nil,
  queue_id: String.t(),
  sample_id: String.t(),
  tenant_id: String.t(),
  time_spent_ms: non_neg_integer(),
  user_id: String.t(),
  values: map()
}