diff --git a/database/migrations/2025_09_25_104304_added_unique_serial_number_to_quality_validations.php b/database/migrations/2025_09_25_104304_added_unique_serial_number_to_quality_validations.php
new file mode 100644
index 0000000..1fd9816
--- /dev/null
+++ b/database/migrations/2025_09_25_104304_added_unique_serial_number_to_quality_validations.php
@@ -0,0 +1,31 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    /**
+     * Run the migrations.
+     */
+    public function up(): void
+    {
+        $sql1 = <<<'SQL'
+        ALTER TABLE quality_validations
+        ADD UNIQUE (plant_id, serial_number);
+        SQL;
+
+        DB::statement($sql1);
+    }
+
+    /**
+     * Reverse the migrations.
+     */
+    public function down(): void
+    {
+        // Schema::table('quality_validations', function (Blueprint $table) {
+        //     //
+        // });
+    }
+};