feat(users): enforce active email uniqueness per role

database/migrations/2026_09_04_000000_scope_active_email_unique_per_role.php

@@ -0,0 +1,24 @@
+<?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('users', function (Blueprint $table): void {
+            $table->unique(['active_email', 'rol_codigo']);
+            $table->dropUnique(['active_email']);
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::table('users', function (Blueprint $table): void {
+            $table->unique('active_email');
+            $table->dropUnique(['active_email', 'rol_codigo']);
+        });
+    }
+};