fix: use Prisma adapter for Better Auth to resolve database adapter error

src/lib/auth.ts

@@ -1,63 +1,18 @@
 import { betterAuth } from 'better-auth';
+import { prismaAdapter } from 'better-auth/adapters/prisma';
+import { db } from './db';
 
 export const auth = betterAuth({
-  database: {
+  database: prismaAdapter(db, {
     provider: 'postgresql',
-    url: process.env.DATABASE_URL!,
-  },
+  }),
   emailAndPassword: {
     enabled: true,
-    requireEmailVerification: false, // Can be enabled later
+    requireEmailVerification: false,
   },
   session: {
     expiresIn: 60 * 60 * 24 * 7, // 7 days
-    updateAge: 60 * 60 * 24, // Update session every 24 hours
-  },
-  // Custom schema mapping for our auth_user table structure
-  schema: {
-    user: {
-      tableName: 'auth_user',
-      fields: {
-        id: 'id',
-        email: 'email',
-        emailVerified: 'email_verified',
-        name: 'name',
-        image: 'image',
-        createdAt: 'created_at',
-        updatedAt: 'updated_at',
-      },
-    },
-    session: {
-      tableName: 'auth_session',
-      fields: {
-        id: 'id',
-        userId: 'user_id',
-        token: 'token',
-        expiresAt: 'expires_at',
-        ipAddress: 'ip_address',
-        userAgent: 'user_agent',
-        createdAt: 'created_at',
-        updatedAt: 'updated_at',
-      },
-    },
-    account: {
-      tableName: 'auth_account',
-      fields: {
-        id: 'id',
-        userId: 'user_id',
-        accountId: 'account_id',
-        providerId: 'provider_id',
-        accessToken: 'access_token',
-        refreshToken: 'refresh_token',
-        idToken: 'id_token',
-        accessTokenExpiresAt: 'access_token_expires_at',
-        refreshTokenExpiresAt: 'refresh_token_expires_at',
-        scope: 'scope',
-        password: 'password',
-        createdAt: 'created_at',
-        updatedAt: 'updated_at',
-      },
-    },
+    updateAge: 60 * 60 * 24,
   },
 });