diff --git a/db/migrations/20200305165407_add_constraints.php b/db/migrations/20200305165407_add_constraints.php
new file mode 100644
index 0000000..9442233
--- /dev/null
+++ b/db/migrations/20200305165407_add_constraints.php
@@ -0,0 +1,80 @@
+<?php
+
+use Phinx\Migration\AbstractMigration;
+
+class AddConstraints extends AbstractMigration
+{
+    /**
+     * Add constraints on all necessary tables
+     */
+    public function change()
+    {
+        $this->table('command')
+             ->addForeignKey('id_user', 'user', 'id', ['delete' => 'CASCADE', 'update' => 'CASCADE'])
+             ->save();
+        
+        $this->table('conditional_group')
+             ->addForeignKey('id_user', 'user', 'id', ['delete' => 'CASCADE', 'update' => 'CASCADE'])
+             ->save();
+        
+        $this->table('contact')
+             ->addForeignKey('id_user', 'user', 'id', ['delete' => 'CASCADE', 'update' => 'CASCADE'])
+             ->save();
+
+        $this->table('event')
+             ->addForeignKey('id_user', 'user', 'id', ['delete' => 'CASCADE', 'update' => 'CASCADE'])
+             ->save();
+
+        $this->table('group')
+             ->addForeignKey('id_user', 'user', 'id', ['delete' => 'CASCADE', 'update' => 'CASCADE'])
+             ->save();
+
+        $this->table('group_contact')
+             ->addForeignKey('id_group', 'group', 'id', ['delete' => 'CASCADE', 'update' => 'CASCADE'])
+             ->addForeignKey('id_contact', 'contact', 'id', ['delete' => 'CASCADE', 'update' => 'CASCADE'])
+             ->save();
+
+        $this->table('media')
+             ->addForeignKey('id_scheduled', 'scheduled', 'id', ['delete' => 'CASCADE', 'update' => 'CASCADE'])
+             ->save();
+
+        $this->table('phone')
+             ->addForeignKey('id_user', 'user', 'id', ['delete' => 'CASCADE', 'update' => 'CASCADE'])
+             ->save();
+
+        $this->table('scheduled')
+             ->addForeignKey('id_user', 'user', 'id', ['delete' => 'CASCADE', 'update' => 'CASCADE'])
+             ->save();
+
+        $this->table('scheduled_conditional_group')
+             ->addForeignKey('id_scheduled', 'scheduled', 'id', ['delete' => 'CASCADE', 'update' => 'CASCADE'])
+             ->addForeignKey('id_conditional_group', 'conditional_group', 'id', ['delete' => 'CASCADE', 'update' => 'CASCADE'])
+             ->save();
+
+        $this->table('scheduled_contact')
+             ->addForeignKey('id_scheduled', 'scheduled', 'id', ['delete' => 'CASCADE', 'update' => 'CASCADE'])
+             ->addForeignKey('id_contact', 'contact', 'id', ['delete' => 'CASCADE', 'update' => 'CASCADE'])
+             ->save();
+
+        $this->table('scheduled_group')
+             ->addForeignKey('id_scheduled', 'scheduled', 'id', ['delete' => 'CASCADE', 'update' => 'CASCADE'])
+             ->addForeignKey('id_group', 'group', 'id', ['delete' => 'CASCADE', 'update' => 'CASCADE'])
+             ->save();
+
+        $this->table('scheduled_number')
+             ->addForeignKey('id_scheduled', 'scheduled', 'id', ['delete' => 'CASCADE', 'update' => 'CASCADE'])
+             ->save();
+        
+        $this->table('setting')
+             ->addForeignKey('id_user', 'user', 'id', ['delete' => 'CASCADE', 'update' => 'CASCADE'])
+                 ->save();
+
+        $this->table('smsstop')
+             ->addForeignKey('id_user', 'user', 'id', ['delete' => 'CASCADE', 'update' => 'CASCADE'])
+             ->save();
+        
+        $this->table('webhook')
+             ->addForeignKey('id_user', 'user', 'id', ['delete' => 'CASCADE', 'update' => 'CASCADE'])
+             ->save();
+    }
+}