Add import, fix export

app/lib/persistence/db.ts

@@ -170,37 +170,29 @@ export async function forkChat(db: IDBDatabase, chatId: string, messageId: strin
   // Get messages up to and including the selected message
   const messages = chat.messages.slice(0, messageIndex + 1);
 
-  // Generate new IDs
-  const newId = await getNextId(db);
-  const urlId = await getUrlId(db, newId);
-
-  // Create the forked chat
-  await setMessages(
-    db,
-    newId,
-    messages,
-    urlId,
-    chat.description ? `${chat.description} (fork)` : 'Forked chat'
-  );
-
-  return urlId;
+  return createChatFromMessages(db, chat.description ? `${chat.description} (fork)` : 'Forked chat', messages);
 }
 
+
+
 export async function duplicateChat(db: IDBDatabase, id: string): Promise<string> {
   const chat = await getMessages(db, id);
   if (!chat) {
     throw new Error('Chat not found');
   }
+  return createChatFromMessages(db, `${chat.description || 'Chat'} (copy)`, chat.messages);
+}
 
+export async function createChatFromMessages(db: IDBDatabase, description: string, messages: Message[]) : Promise<string> {
   const newId = await getNextId(db);
   const newUrlId = await getUrlId(db, newId); // Get a new urlId for the duplicated chat
 
   await setMessages(
     db,
     newId,
-    chat.messages,
+    messages,
     newUrlId, // Use the new urlId
-    `${chat.description || 'Chat'} (copy)`
+    description
   );
 
   return newUrlId; // Return the urlId instead of id for navigation