fix(auth): migrate from next-auth to better-auth (#1453)

lib/db/queries.ts

@@ -17,7 +17,7 @@ import postgres from "postgres";
 import type { ArtifactKind } from "@/components/artifact";
 import type { VisibilityType } from "@/components/visibility-selector";
 import { ChatbotError } from "../errors";
-import { generateUUID } from "../utils";
+
 import {
   type Chat,
   chat,
@@ -27,58 +27,13 @@ import {
   type Suggestion,
   stream,
   suggestion,
-  type User,
-  user,
   vote,
 } from "./schema";
-import { generateHashedPassword } from "./utils";
-
-// Optionally, if not using email/pass login, you can
-// use the Drizzle adapter for Auth.js / NextAuth
-// https://authjs.dev/reference/adapter/drizzle
 
 // biome-ignore lint: Forbidden non-null assertion.
 const client = postgres(process.env.POSTGRES_URL!);
 const db = drizzle(client);
 
-export async function getUser(email: string): Promise<User[]> {
-  try {
-    return await db.select().from(user).where(eq(user.email, email));
-  } catch (_error) {
-    throw new ChatbotError(
-      "bad_request:database",
-      "Failed to get user by email"
-    );
-  }
-}
-
-export async function createUser(email: string, password: string) {
-  const hashedPassword = generateHashedPassword(password);
-
-  try {
-    return await db.insert(user).values({ email, password: hashedPassword });
-  } catch (_error) {
-    throw new ChatbotError("bad_request:database", "Failed to create user");
-  }
-}
-
-export async function createGuestUser() {
-  const email = `guest-${Date.now()}`;
-  const password = generateHashedPassword(generateUUID());
-
-  try {
-    return await db.insert(user).values({ email, password }).returning({
-      id: user.id,
-      email: user.email,
-    });
-  } catch (_error) {
-    throw new ChatbotError(
-      "bad_request:database",
-      "Failed to create guest user"
-    );
-  }
-}
-
 export async function saveChat({
   id,
   userId,