Make all users admins: update schema default, add migration, simplify registration and OAuth flows

Co-authored-by: xCyanGrizzly <53275238+xCyanGrizzly@users.noreply.github.com>

prisma/migrations/20260304200000_make_all_users_admin/migration.sql

@@ -0,0 +1,5 @@
+-- Promote all existing users to ADMIN (self-hosted: every user is an admin)
+UPDATE "User" SET "role" = 'ADMIN' WHERE "role" = 'USER';
+
+-- Change the default role for new users to ADMIN
+ALTER TABLE "User" ALTER COLUMN "role" SET DEFAULT 'ADMIN';

prisma/schema.prisma

@@ -22,7 +22,7 @@ model User {
   emailVerified  DateTime?
   image          String?
   hashedPassword String?
-  role           Role      @default(USER)
+  role           Role      @default(ADMIN)
   createdAt      DateTime  @default(now())
   updatedAt      DateTime  @updatedAt
 

src/app/(auth)/register/actions.ts

@@ -21,17 +21,13 @@ export async function registerUser(input: unknown): Promise<ActionResult<{ id: s
 
   const hashedPassword = await bcrypt.hash(parsed.data.password, 10);
 
-  // First user to register becomes ADMIN (self-hosted owner)
-  const user = await prisma.$transaction(async (tx) => {
-    const userCount = await tx.user.count();
-    const role = userCount === 0 ? "ADMIN" : "USER";
-
-    return tx.user.create({
+  // Self-hosted: all users are admins
+  const user = await prisma.user.create({
     data: {
       name: parsed.data.name,
       email: parsed.data.email,
       hashedPassword,
-        role,
+      role: "ADMIN",
       settings: {
         create: {
           lowStockThreshold: 10,
@@ -42,7 +38,6 @@ export async function registerUser(input: unknown): Promise<ActionResult<{ id: s
       },
     },
   });
-  });
 
   return { success: true, data: { id: user.id } };
 }

src/lib/auth.ts

@@ -18,12 +18,12 @@ export const { auth, handlers, signIn, signOut } = NextAuth({
     async jwt({ token, user }) {
       if (user) {
         token.id = user.id!;
-        // Fetch the role from the database to pick up first-user ADMIN promotion
+        // Fetch the role from the database to ensure token reflects current role
         const dbUser = await prisma.user.findUnique({
           where: { id: user.id! },
           select: { role: true },
         });
-        token.role = dbUser?.role ?? user.role ?? "USER";
+        token.role = dbUser?.role ?? user.role ?? "ADMIN";
       }
       return token;
     },
@@ -38,17 +38,11 @@ export const { auth, handlers, signIn, signOut } = NextAuth({
   events: {
     async createUser({ user }) {
       if (user.id) {
-        // First user to register becomes ADMIN (self-hosted owner)
-        const adminExists = await prisma.user.findFirst({
-          where: { role: "ADMIN" },
-          select: { id: true },
-        });
-        if (!adminExists) {
+        // Self-hosted: all users are admins
         await prisma.user.update({
           where: { id: user.id },
           data: { role: "ADMIN" },
         });
-        }
 
         await prisma.userSettings.upsert({
           where: { userId: user.id },