@type t() :: %Figler.Schema.AIChatMessage{
  client_id: String.t() | nil,
  content: [Figler.Schema.AIChatContentPart.t()] | nil,
  created_at_ms: non_neg_integer() | nil,
  created_at_ms64: non_neg_integer() | nil,
  role: Figler.Schema.AIChatMessageRole.t() | nil
}