Added tooltips and fork

app/lib/persistence/db.ts

@@ -159,6 +159,33 @@ async function getUrlIds(db: IDBDatabase): Promise<string[]> {
   });
 }
 
+export async function forkChat(db: IDBDatabase, chatId: string, messageId: string): Promise<string> {
+  const chat = await getMessages(db, chatId);
+  if (!chat) throw new Error('Chat not found');
+
+  // Find the index of the message to fork at
+  const messageIndex = chat.messages.findIndex(msg => msg.id === messageId);
+  if (messageIndex === -1) throw new Error('Message not found');
+
+  // 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;
+}
+
 export async function duplicateChat(db: IDBDatabase, id: string): Promise<string> {
   const chat = await getMessages(db, id);
   if (!chat) {