app/Domains/Core/Administrator/Resources/AdministratorResource.php

@@ -18,6 +18,7 @@ class AdministratorResource extends JsonResource
             'dni' => $this->dni,
             'email' => $this->email,
             'rol_codigo' => $this->rol_codigo,
+            'event_id' => $this->event_id,
             'role' => $this->whenLoaded('role', fn () => [
                 'codigo' => $this->role?->codigo,
                 'nombre' => $this->role?->nombre,

app/Domains/Core/Auth/Models/User.php

@@ -2,11 +2,12 @@
 
 namespace App\Domains\Core\Auth\Models;
 
+use App\Domains\Commerce\Catalog\Models\Category;
 use App\Domains\Core\Authorization\Enums\RoleCode;
 use App\Domains\Core\Authorization\Models\Role;
-use App\Domains\Commerce\Catalog\Models\Category;
-use App\Domains\Ticketing\Event\Models\EventDateChangeView;
 use App\Domains\Core\Tenant\Models\Tenant;
+use App\Domains\Ticketing\Event\Models\Event;
+use App\Domains\Ticketing\Event\Models\EventDateChangeView;
 use App\Domains\Ticketing\Ticket\Models\ScanAttempt;
 use Database\Factories\UserFactory;
 use Illuminate\Database\Eloquent\Attributes\Fillable;
@@ -20,7 +21,7 @@ use Illuminate\Foundation\Auth\User as Authenticatable;
 use Illuminate\Notifications\Notifiable;
 use Laravel\Sanctum\HasApiTokens;
 
-#[Fillable(['nombre_apellido', 'email', 'password', 'dni', 'telefono', 'google_id', 'rol_codigo', 'tenant_codigo'])]
+#[Fillable(['nombre_apellido', 'email', 'password', 'dni', 'telefono', 'google_id', 'rol_codigo', 'tenant_codigo', 'event_id'])]
 #[Hidden(['password', 'remember_token', 'active_email', 'active_google_id'])]
 class User extends Authenticatable
 {
@@ -86,6 +87,12 @@ class User extends Authenticatable
         return $this->belongsTo(Tenant::class, 'tenant_codigo', 'codigo');
     }
 
+    /** @return BelongsTo<Event, $this> */
+    public function event(): BelongsTo
+    {
+        return $this->belongsTo(Event::class);
+    }
+
     /** @return BelongsToMany<Category, $this> */
     public function scanCategories(): BelongsToMany
     {
@@ -103,6 +110,7 @@ class User extends Authenticatable
     protected function casts(): array
     {
         return [
+            'event_id' => 'integer',
             'email_verified_at' => 'datetime',
             'password' => 'hashed',
             'failed_login_attempts' => 'integer',

app/Domains/Core/Auth/Resources/UserResource.php

@@ -24,6 +24,7 @@ class UserResource extends JsonResource
             'telefono' => $this->telefono,
             'rol_codigo' => $this->rol_codigo,
             'tenant_codigo' => $this->tenant_codigo,
+            'event_id' => $this->event_id,
             'categories' => $this->whenLoaded('scanCategories', fn () => $this->scanCategories
                 ->map(fn ($category) => [
                     'id' => $category->id,

database/migrations/2026_10_01_000000_add_event_id_to_users_table.php

@@ -0,0 +1,28 @@
+<?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->foreignId('event_id')
+                ->nullable()
+                ->after('tenant_codigo')
+                ->constrained('events')
+                ->cascadeOnUpdate()
+                ->restrictOnDelete();
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::table('users', function (Blueprint $table): void {
+            $table->dropForeign(['event_id']);
+            $table->dropColumn('event_id');
+        });
+    }
+};

tests/Feature/Auth/UserAuthorizationRelationsTest.php

@@ -17,6 +17,7 @@ class UserAuthorizationRelationsTest extends TestCase
         $this->assertTrue(Schema::hasColumns('users', [
             'rol_codigo',
             'tenant_codigo',
+            'event_id',
         ]));
     }
 
@@ -28,5 +29,7 @@ class UserAuthorizationRelationsTest extends TestCase
         $this->assertNull($user->tenant_codigo);
         $this->assertSame(RoleCode::User->value, $user->role->codigo);
         $this->assertNull($user->tenant);
+        $this->assertNull($user->event_id);
+        $this->assertNull($user->event);
     }
 }

tests/Feature/Migrations/AddEventIdToUsersTest.php

@@ -0,0 +1,57 @@
+<?php
+
+namespace Tests\Feature\Migrations;
+
+use App\Domains\Core\Administrator\Resources\AdministratorResource;
+use App\Domains\Core\Auth\Models\User;
+use App\Domains\Core\Auth\Resources\UserResource;
+use Illuminate\Database\QueryException;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Http\Request;
+use Illuminate\Support\Facades\DB;
+use Illuminate\Support\Facades\Schema;
+use Tests\TestCase;
+
+class AddEventIdToUsersTest extends TestCase
+{
+    public function test_event_assignment_preserves_existing_users_and_restricts_event_deletion(): void
+    {
+        Schema::create('events', function (Blueprint $table): void {
+            $table->id();
+        });
+        Schema::create('users', function (Blueprint $table): void {
+            $table->id();
+            $table->string('tenant_codigo')->nullable();
+            $table->softDeletes();
+            $table->timestamps();
+        });
+        DB::table('users')->insert(['id' => 1, 'tenant_codigo' => 'legacy']);
+        DB::table('events')->insert(['id' => 42]);
+
+        $migration = require database_path('migrations/2026_10_01_000000_add_event_id_to_users_table.php');
+        $migration->up();
+
+        $legacy = User::query()->findOrFail(1);
+        $this->assertNull($legacy->event_id);
+        $this->assertNull($legacy->event);
+        $this->assertSame('legacy', $legacy->tenant_codigo);
+
+        $legacy->update(['event_id' => '42']);
+        $user = $legacy->fresh();
+        $this->assertSame(42, $user->event_id);
+        $this->assertSame(42, $user->event->id);
+        $this->assertSame(42, UserResource::make($user)->resolve(new Request)['event_id']);
+        $this->assertSame(42, AdministratorResource::make($user)->resolve(new Request)['event_id']);
+
+        try {
+            DB::table('events')->where('id', 42)->delete();
+            $this->fail('An assigned event must not be deleted.');
+        } catch (QueryException $exception) {
+            $this->assertStringContainsString('FOREIGN KEY', $exception->getMessage());
+        }
+
+        $migration->down();
+        $this->assertFalse(Schema::hasColumn('users', 'event_id'));
+        $this->assertSame('legacy', DB::table('users')->where('id', 1)->value('tenant_codigo'));
+    }
+}