export interface ChatMessage {
  id: string;
  userId: string;
  body: string;
  createdAt: Date;
  updatedAt?: Date;
  authorUsername: string;
  authorAvatarMime?: string;
  /** Id of the message this one replies to, if any. Retained even when the
   * target is later deleted (the preview fields below then go undefined). */
  replyToId?: string;
  /** Author/snippet of the replied-to message, for a subtle inline reference.
   * Absent when there's no reply, or the target has since been deleted. */
  replyToAuthor?: string;
  replyToBody?: string;
}