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database/migrations/2026_06_02_000002_create_duns_table.php

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+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    public function up(): void
+    {
+        Schema::create('duns', function (Blueprint $table): void {
+            $table->id();
+            $table->foreignId('election_id')->constrained()->cascadeOnDelete();
+            $table->string('code', 20);
+            $table->string('name');
+            $table->timestamps();
+            $table->softDeletes();
+
+            $table->unique(['election_id', 'code']);
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::dropIfExists('duns');
+    }
+};