diff --git a/server/routes/device.js b/server/routes/device.js
index b0e1cf6..a0143ff 100644
--- a/server/routes/device.js
+++ b/server/routes/device.js
@@ -317,6 +317,8 @@ router.get('/:id', authenticateToken, async (req, res) => {
 // POST /api/devices - Create new device (admin only)
 router.post('/', authenticateToken, validateRequest(deviceSchema), async (req, res) => {
   try {
+    const { Device, DroneDetection, Heartbeat, Tenant } = getModels();
+    
     // Determine tenant from request
     const tenantId = await multiAuth.determineTenant(req);
     if (!tenantId) {
@@ -388,6 +390,8 @@ router.post('/', authenticateToken, validateRequest(deviceSchema), async (req, r
 // PUT /api/devices/:id - Update device
 router.put('/:id', authenticateToken, validateRequest(updateDeviceSchema), async (req, res) => {
   try {
+    const { Device, DroneDetection, Heartbeat, Tenant } = getModels();
+    
     const device = await Device.findByPk(req.params.id);
     
     if (!device) {
@@ -426,6 +430,8 @@ router.put('/:id', authenticateToken, validateRequest(updateDeviceSchema), async
 // DELETE /api/devices/:id - Delete device (admin only)
 router.delete('/:id', authenticateToken, async (req, res) => {
   try {
+    const { Device, DroneDetection, Heartbeat, Tenant } = getModels();
+    
     const device = await Device.findByPk(req.params.id);
     
     if (!device) {
@@ -456,6 +462,8 @@ router.delete('/:id', authenticateToken, async (req, res) => {
 // GET /api/devices/pending - List devices pending approval
 router.get('/pending', authenticateToken, async (req, res) => {
   try {
+    const { Device, DroneDetection, Heartbeat, Tenant } = getModels();
+    
     const pendingDevices = await Device.findAll({
       where: { is_approved: false },
       attributes: [
@@ -483,6 +491,8 @@ router.get('/pending', authenticateToken, async (req, res) => {
 // POST /api/devices/:id/approve - Approve or reject a device
 router.post('/:id/approve', async (req, res) => {
   try {
+    const { Device, DroneDetection, Heartbeat, Tenant } = getModels();
+    
     const deviceId = parseInt(req.params.id);
     const { approved } = req.body;