@type t() :: %Synapse.Workflow.Persistence.Snapshot{
  audit_trail: map(),
  context: map(),
  error: map() | nil,
  input: map(),
  last_attempt: non_neg_integer() | nil,
  last_step_id: String.t() | nil,
  request_id: String.t(),
  results: map(),
  spec_name: String.t(),
  spec_version: non_neg_integer(),
  status: atom() | String.t()
}