feat: implement connection and database types

types/message.ts

@@ -1,9 +1,16 @@
 import { Id, Timestamp } from "./";
 
+export enum CreatorRole {
+  System = "system",
+  User = "user",
+  Assistant = "assistant",
+}
+
 export interface Message {
   id: Id;
   chatId: string;
   creatorId: Id;
+  creatorRole: CreatorRole;
   createdAt: Timestamp;
   content: string;
 }