@type t() :: %ProcessHub.Handler.ChildrenAdd.PostStartData{
  child_nodes: [{node(), pid()}],
  child_spec: ProcessHub.child_spec(),
  cid: ProcessHub.child_id(),
  for_node: {node(), [{:migration, boolean()}]},
  has_errors: boolean(),
  metadata: map(),
  nodes: [node()],
  pid: pid(),
  result: {:ok, pid()} | {:error, term()}
}