added security prevent no nsuper admins editing super admins

backend/src/middleware/auth.js

@@ -15,10 +15,18 @@ module.exports = (pool, query) => {
       
       try {
         // Verify API key
-        const result = await query(
-          'SELECT id, email, first_name, last_name, is_admin FROM users WHERE api_key = $1',
-          [apiKey]
-        );
+        
+        const result = await query(`
+          SELECT 
+            u.*,
+            CASE WHEN s.user_id IS NOT NULL THEN TRUE ELSE FALSE END AS is_super_admin
+          FROM 
+            users u
+          LEFT JOIN 
+            superadmins s ON u.id = s.user_id
+          WHERE 
+            u.api_key = $1
+        `, [apiKey]);
         
         if (result.rows.length === 0) {
           return res.status(401).json({

backend/src/routes/userAdmin.js

@@ -29,17 +29,22 @@ module.exports = (pool, query, authMiddleware) => {
       
       const result = await query(`
         SELECT 
-          id, 
-          email, 
-          first_name, 
-          last_name, 
-          is_admin, 
-          is_disabled, 
-          internal_notes, 
-          created_at, 
-          last_login
-        FROM users
-        ORDER BY last_login DESC NULLS LAST
+          u.id, 
+          u.email, 
+          u.first_name, 
+          u.last_name, 
+          u.is_admin, 
+          u.is_disabled, 
+          u.internal_notes, 
+          u.created_at, 
+          u.last_login,
+          CASE WHEN s.user_id IS NOT NULL THEN TRUE ELSE FALSE END AS is_super_admin
+        FROM 
+          users u
+        LEFT JOIN 
+          superadmins s ON u.id = s.user_id
+        ORDER BY 
+          u.last_login DESC NULLS LAST
       `);
       
       res.json(result.rows);
@@ -63,17 +68,22 @@ module.exports = (pool, query, authMiddleware) => {
       
       const result = await query(`
         SELECT 
-          id, 
-          email, 
-          first_name, 
-          last_name, 
-          is_admin, 
-          is_disabled, 
-          internal_notes, 
-          created_at, 
-          last_login
-        FROM users 
-        WHERE id = $1
+          u.id, 
+          u.email, 
+          u.first_name, 
+          u.last_name, 
+          u.is_admin, 
+          u.is_disabled, 
+          u.internal_notes, 
+          u.created_at, 
+          u.last_login,
+          CASE WHEN s.user_id IS NOT NULL THEN TRUE ELSE FALSE END AS is_super_admin
+        FROM 
+          users u
+        LEFT JOIN 
+          superadmins s ON u.id = s.user_id
+        WHERE 
+          u.id = $1
       `, [id]);
       
       if (result.rows.length === 0) {
@@ -95,7 +105,7 @@ module.exports = (pool, query, authMiddleware) => {
       const { id } = req.params;
       const { is_disabled, internal_notes, is_admin } = req.body;
       
-      
+      //  Verify admin status from middleware
       if (!req.user.is_admin) {
         return res.status(403).json({
           error: true,
@@ -103,8 +113,25 @@ module.exports = (pool, query, authMiddleware) => {
         });
       } 
       
-      // Check if user exists
-      const userCheck = await query('SELECT * FROM users WHERE id = $1', [id]);
+      if (is_admin !== undefined && typeof is_admin !== 'boolean') {
+        return res.status(400).json({
+          error: true,
+          message: 'is_admin must be a boolean'
+        });
+      }
+      
+      // 4. Check if user exists and get their details (including superadmin status)
+      const userCheck = await query(`
+        SELECT 
+          u.*, 
+          CASE WHEN s.user_id IS NOT NULL THEN TRUE ELSE FALSE END AS is_super_admin
+        FROM 
+          users u
+        LEFT JOIN 
+          superadmins s ON u.id = s.user_id
+        WHERE 
+          u.id = $1
+      `, [id]);
       
       if (userCheck.rows.length === 0) {
         return res.status(404).json({
@@ -113,19 +140,39 @@ module.exports = (pool, query, authMiddleware) => {
         });
       }
       
-      // Update only allowed fields
+      const targetUser = userCheck.rows[0];
+      
+      // - If target user is a superadmin, only allow self-editing
+      if (targetUser.is_super_admin && req.user.id !== targetUser.id) {
+        return res.status(403).json({
+          error: true,
+          message: 'Superadmin accounts can only be edited by themselves'
+        });
+      }
+      
       const result = await query(`
         UPDATE users 
         SET 
           is_disabled = $1, 
           internal_notes = $2,
-          is_admin = $3
+          is_admin = CASE 
+            WHEN EXISTS (SELECT 1 FROM superadmins WHERE user_id = $4) THEN TRUE 
+            ELSE $3 
+          END
         WHERE id = $4
-        RETURNING id, email, first_name, last_name, is_admin, is_disabled, internal_notes
+        RETURNING 
+          id, 
+          email, 
+          first_name, 
+          last_name, 
+          is_admin, 
+          is_disabled, 
+          internal_notes,
+          (SELECT CASE WHEN COUNT(*) > 0 THEN TRUE ELSE FALSE END FROM superadmins WHERE user_id = $4) AS is_super_admin
       `, [
-        is_disabled !== undefined ? is_disabled : userCheck.rows[0].is_disabled,
-        internal_notes !== undefined ? internal_notes : userCheck.rows[0].internal_notes,
-        is_admin !== undefined ? is_admin : userCheck.rows[0].is_admin,
+        is_disabled !== undefined ? is_disabled : targetUser.is_disabled,
+        internal_notes !== undefined ? internal_notes : targetUser.internal_notes,
+        is_admin !== undefined ? is_admin : targetUser.is_admin,
         id
       ]);
       
@@ -134,10 +181,10 @@ module.exports = (pool, query, authMiddleware) => {
         user: result.rows[0]
       });
     } catch (error) {
+      // Pass to error handler middleware
       next(error);
     }
   });
-
   // Send email to user
   router.post('/send-email', async (req, res, next) => {
     try {

frontend/src/pages/Admin/CustomersPage.jsx

@@ -227,6 +227,14 @@ const AdminCustomersPage = () => {
                         <Chip 
                           size="small" 
                           label="Admin" 
+                          color="secondary" 
+                          sx={{ ml: 1 }}
+                        />
+                      )}
+                      {user.is_super_admin && (
+                        <Chip 
+                          size="small" 
+                          label="Super Admin" 
                           color="primary" 
                           sx={{ ml: 1 }}
                         />