@type t() :: %Figler.Schema.NodeChatMessage{
  id: Figler.Schema.GUID.t() | nil,
  sent_at: non_neg_integer() | nil,
  sent_at64: non_neg_integer() | nil,
  text_content: String.t() | nil,
  tool_calls: [Figler.Schema.NodeChatToolCall.t()] | nil,
  tool_results: [Figler.Schema.NodeChatToolResult.t()] | nil,
  type: Figler.Schema.NodeChatMessageType.t() | nil,
  user_id: String.t() | nil
}