@type t() :: %Gleanex.Platform.ChatCitationAnnotation{
  end_index: integer() | nil,
  snippets: [Gleanex.Platform.ChatCitationSnippet.t()] | nil,
  sources: [
    map()
    | Gleanex.Platform.ChatCustomEntitySource.t()
    | Gleanex.Platform.ChatFileSource.t()
    | Gleanex.Platform.ChatPersonSource.t()
  ],
  start_index: integer() | nil,
  type: String.t()
}