upgrade ai sdk to v5

database/lowdb.ts

@@ -1,5 +1,6 @@
 import { Low } from "lowdb";
 import { JSONFile } from "lowdb/node";
+import type { CommittedMessage } from "../types";
 
 export type Conversation = {
   id: string;
@@ -27,7 +28,7 @@ export type FactTrigger = {
 
 type DB = {
   conversations: Array<Conversation>;
-  messages: Array<{
+  messages: Array</*{
     id: string;
     conversationId: string;
     content: string;
@@ -35,7 +36,7 @@ type DB = {
     index: number;
     createdAt: string;
     runningSummary?: string;
-  }>;
+  }*/ CommittedMessage>;
   facts: Array<Fact>;
   factTriggers: Array<FactTrigger>;
 };