email can't be null, username removed since email can't be null

backend/routes/auth.js

@@ -43,13 +43,11 @@ router.post(
   validateRegistration,
   async (req, res) => {
     try {
-      const { username, email, password, firstName, lastName, phone } =
+      const { email, password, firstName, lastName, phone } =
         req.body;
 
       const existingUser = await User.findOne({
-        where: {
-          [require("sequelize").Op.or]: [{ email }, { username }],
-        },
+        where: { email },
       });
 
       if (existingUser) {
@@ -96,7 +94,6 @@ router.post(
       }
 
       const user = await User.create({
-        username,
         email,
         password,
         firstName,
@@ -161,14 +158,12 @@ router.post(
       const reqLogger = logger.withRequestId(req.id);
       reqLogger.info("User registration successful", {
         userId: user.id,
-        username: user.username,
         email: user.email,
       });
 
       res.status(201).json({
         user: {
           id: user.id,
-          username: user.username,
           email: user.email,
           firstName: user.firstName,
           lastName: user.lastName,
@@ -184,7 +179,6 @@ router.post(
         error: error.message,
         stack: error.stack,
         email: req.body.email,
-        username: req.body.username,
       });
       res.status(500).json({ error: "Registration failed. Please try again." });
     }
@@ -265,7 +259,6 @@ router.post(
       res.json({
         user: {
           id: user.id,
-          username: user.username,
           email: user.email,
           firstName: user.firstName,
           lastName: user.lastName,
@@ -326,9 +319,9 @@ router.post(
       } = payload;
 
       if (!email) {
-        return res
-          .status(400)
-          .json({ error: "Email not provided by Google" });
+        return res.status(400).json({
+          error: "Email permission is required to continue. Please grant email access when signing in with Google and try again."
+        });
       }
 
       // Handle cases where Google doesn't provide name fields
@@ -375,7 +368,6 @@ router.post(
           authProvider: "google",
           providerId: googleId,
           profileImage: picture,
-          username: email.split("@")[0] + "_" + googleId.slice(-6), // Generate unique username
           isVerified: true,
           verifiedAt: new Date(),
         });
@@ -439,7 +431,6 @@ router.post(
       res.json({
         user: {
           id: user.id,
-          username: user.username,
           email: user.email,
           firstName: user.firstName,
           lastName: user.lastName,
@@ -677,7 +668,6 @@ router.post("/refresh", async (req, res) => {
     res.json({
       user: {
         id: user.id,
-        username: user.username,
         email: user.email,
         firstName: user.firstName,
         lastName: user.lastName,