diff --git a/Backend/database/migrations/001_add_oauth_profile_fields.sql b/Backend/database/migrations/001_add_oauth_profile_fields.sql
new file mode 100644
index 0000000..882b602
--- /dev/null
+++ b/Backend/database/migrations/001_add_oauth_profile_fields.sql
@@ -0,0 +1,12 @@
+-- Migration 001 — Add OAuth + profile fields
+-- Safe: ADD COLUMN NULL only, no data loss
+-- Run: mysql -u <user> -p clickerz < migrations/001_add_oauth_profile_fields.sql
+
+ALTER TABLE users
+  ADD COLUMN IF NOT EXISTS firstname VARCHAR(50) NULL,
+  ADD COLUMN IF NOT EXISTS lastname VARCHAR(50) NULL,
+  ADD COLUMN IF NOT EXISTS super_oauth_id VARCHAR(36) NULL;
+
+-- Unique index separately (idempotent)
+CREATE UNIQUE INDEX IF NOT EXISTS uq_users_super_oauth_id
+  ON users (super_oauth_id);
diff --git a/Backend/database/schema.sql b/Backend/database/schema.sql
index d6a9cdb..8c4793d 100755
--- a/Backend/database/schema.sql
+++ b/Backend/database/schema.sql
@@ -1,9 +1,12 @@
 DROP TABLE IF EXISTS users;
 
 CREATE TABLE users (
-id INT AUTO_INCREMENT PRIMARY KEY,
-nickname VARCHAR(30) NOT NULL,
-mail VARCHAR(90) NOT NULL,
-password VARCHAR(200) NOT NULL,
-tetardcoin INT default 0
+  id INT AUTO_INCREMENT PRIMARY KEY,
+  nickname VARCHAR(30) NOT NULL,
+  mail VARCHAR(90) NOT NULL,
+  password VARCHAR(200) NOT NULL,
+  tetardcoin INT DEFAULT 0,
+  firstname VARCHAR(50) NULL,
+  lastname VARCHAR(50) NULL,
+  super_oauth_id VARCHAR(36) NULL UNIQUE
 );
diff --git a/Backend/src/models/UserManager.js b/Backend/src/models/UserManager.js
index 84eb62a..11970a5 100755
--- a/Backend/src/models/UserManager.js
+++ b/Backend/src/models/UserManager.js
@@ -7,16 +7,32 @@ class UserManager extends AbstractManager {
 
   // The C of CRUD - Create operation
   async create(user) {
-    const { nickname, mail, tetardcoin, password } = user;
+    const { nickname, mail, tetardcoin, password, firstname, lastname } = user;
 
     const [result] = await this.database.query(
-      `INSERT INTO ${this.table} (nickname, mail, tetardcoin, password) VALUES (?, ?, ?, ?)`,
-      [nickname, mail, tetardcoin, password]
+      `INSERT INTO ${this.table} (nickname, mail, tetardcoin, password, firstname, lastname) VALUES (?, ?, ?, ?, ?, ?)`,
+      [nickname, mail, tetardcoin, password, firstname ?? null, lastname ?? null]
     );
 
     return result.insertId;
   }
 
+  async getBySuperOAuthId(superOAuthId) {
+    const [rows] = await this.database.query(
+      `SELECT * FROM ${this.table} WHERE super_oauth_id = ?`,
+      [superOAuthId]
+    );
+    return rows[0] ?? null;
+  }
+
+  async linkSuperOAuth(id, superOAuthId) {
+    const [result] = await this.database.query(
+      `UPDATE ${this.table} SET super_oauth_id = ? WHERE id = ?`,
+      [superOAuthId, id]
+    );
+    return result.affectedRows;
+  }
+
   // The Rs of CRUD - Read operations
   async read(id, field) {
     if (field) {
@@ -69,6 +85,8 @@ class UserManager extends AbstractManager {
       "nickname",
       "tetardcoin",
       "password",
+      "firstname",
+      "lastname",
     ];
 
     const fieldsToUpdate = Object.keys(updatedFields).filter((field) =>