1. Authentication Library (src/lib/auth.ts)

2. Authentication Routes
3. Updated Data Store (`src/lib/db.ts`)
4. Updated API Routes
5. Updated Frontend Component (`src/components/BikeBuilderApp.tsx`)

prisma/schema.prisma

@@ -8,6 +8,18 @@ datasource db {
   url      = env("DATABASE_URL")
 }
 
+model User {
+  id           String            @id @default(cuid())
+  email        String            @unique
+  passwordHash String
+  name         String?
+  createdAt    DateTime          @default(now())
+  updatedAt    DateTime          @updatedAt
+  builds       BikeBuild[]
+  reviews      RideReview[]
+  preference   RiderPreference?
+}
+
 model Product {
   id        String   @id
   category  String
@@ -36,6 +48,8 @@ model BikeBuild {
   rearTireId    String?
   setup         String
   imagePath     String?
+  userId        String
+  user          User         @relation(fields: [userId], references: [id], onDelete: Cascade)
   reviews       RideReview[]
   createdAt     DateTime     @default(now())
   updatedAt     DateTime     @updatedAt
@@ -45,6 +59,8 @@ model RideReview {
   id         String    @id @default(cuid())
   buildId    String
   build      BikeBuild @relation(fields: [buildId], references: [id], onDelete: Cascade)
+  userId     String
+  user       User      @relation(fields: [userId], references: [id], onDelete: Cascade)
   suspFeel   Int
   frontGrip  Int
   rearGrip   Int
@@ -60,7 +76,9 @@ model RideReview {
 }
 
 model RiderPreference {
-  id             String   @id @default("default")
+  id             String   @id @default(cuid())
+  userId         String   @unique
+  user           User     @relation(fields: [userId], references: [id], onDelete: Cascade)
   harshTendency  Int      @default(0)
   softTendency   Int      @default(0)
   gripPreference Int      @default(0)

prisma/seed.ts

@@ -4,21 +4,35 @@ import { frames, forks, shocks, tires } from "../src/lib/catalog";
 const prisma = new PrismaClient();
 
 async function main() {
-  const products = [...frames, ...forks, ...shocks, ...tires];
-  for (const product of products) {
-    const { id, category, brand, model, imagePath, sources } = product;
-    const position = "position" in product ? product.position : null;
-    await prisma.product.upsert({
-      where: { id },
-      update: { category, position, brand, model, imagePath, specs: JSON.stringify(product), setup: JSON.stringify(product), sources: JSON.stringify(sources) },
-      create: { id, category, position, brand, model, imagePath, specs: JSON.stringify(product), setup: JSON.stringify(product), sources: JSON.stringify(sources) },
-    });
-  }
-  await prisma.riderPreference.upsert({
-    where: { id: "default" },
-    update: {},
-    create: { id: "default" },
-  });
+    const products = [...frames, ...forks, ...shocks, ...tires];
+    for (const product of products) {
+        const { id, category, brand, model, imagePath, sources } = product;
+        const position = "position" in product ? product.position : null;
+        await prisma.product.upsert({
+            where: { id },
+            update: {
+                category,
+                position,
+                brand,
+                model,
+                imagePath,
+                specs: JSON.stringify(product),
+                setup: JSON.stringify(product),
+                sources: JSON.stringify(sources),
+            },
+            create: {
+                id,
+                category,
+                position,
+                brand,
+                model,
+                imagePath,
+                specs: JSON.stringify(product),
+                setup: JSON.stringify(product),
+                sources: JSON.stringify(sources),
+            },
+        });
+    }
 }
 
 main().finally(async () => prisma.$disconnect());