Fix jwt-token

server/models/Device.js

@@ -39,6 +39,15 @@ module.exports = (sequelize) => {
       defaultValue: false,
       comment: 'Whether the device is approved to send data'
     },
+    tenant_id: {
+      type: DataTypes.INTEGER,
+      allowNull: true,
+      references: {
+        model: 'tenants',
+        key: 'id'
+      },
+      comment: 'Foreign key to tenants table for multi-tenant isolation'
+    },
     last_heartbeat: {
       type: DataTypes.DATE,
       allowNull: true,