diff --git a/database/migrations/2026_07_19_000003_unique_email_hash_pagos_confirmados.php b/database/migrations/2026_07_19_000003_unique_email_hash_pagos_confirmados.php
new file mode 100644
index 0000000..8e16af3
--- /dev/null
+++ b/database/migrations/2026_07_19_000003_unique_email_hash_pagos_confirmados.php
@@ -0,0 +1,22 @@
+<?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::table('pagos_confirmados', function (Blueprint $table) {
+            $table->unique('email_hash');
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::table('pagos_confirmados', function (Blueprint $table) {
+            $table->dropUnique(['email_hash']);
+        });
+    }
+};