added unique constraint in table panel box validation to avoid duplicates

database/migrations/2026_08_26_173855_add_constraint_for_serial_number_to_panel_box_validations.php

@@ -0,0 +1,32 @@
+<?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
+    {
+        $sql1 = <<<'SQL'
+            ALTER TABLE panel_box_validations
+            ADD CONSTRAINT panel_box_validations_plant_id_production_order_serial_number_inspection_lot_number_key
+            UNIQUE (plant_id, production_order, serial_number, inspection_lot_number)
+            SQL;
+
+        DB::statement($sql1);
+    }
+
+    /**
+     * Reverse the migrations.
+     */
+    public function down(): void
+    {
+        // Schema::table('panel_box_validations', function (Blueprint $table) {
+        //     //
+        // });
+    }
+};