Fix: socket permissions para nginx

app/Models/Promocion.php

@@ -0,0 +1,39 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsToMany;
+
+class Promocion extends Model
+{
+    protected $table = 'promociones';
+
+    protected $guarded = [];
+
+    protected $casts = [
+        'fecha_inicio' => 'date',
+        'fecha_fin'    => 'date',
+    ];
+
+    public function planteles(): BelongsToMany
+    {
+        return $this->belongsToMany(Plantel::class, 'plantel_promocion');
+    }
+
+    public function alumnos(): BelongsToMany
+    {
+        return $this->belongsToMany(Alumno::class, 'alumno_promocion')
+            ->withPivot(['enviado_at', 'status_envio', 'whatsapp_mensaje_id']);
+    }
+
+    public function isActiva(): bool
+    {
+        return $this->status === 'activo';
+    }
+
+    public function imagenUrl(): ?string
+    {
+        return $this->imagen ? asset('storage/' . $this->imagen) : null;
+    }
+}