Fix API reliability and CORS config for hosted deployment

app/Models/ReservationReminder.php

@@ -8,18 +8,32 @@ use Illuminate\Database\Eloquent\Factories\HasFactory;
 class ReservationReminder extends Model
 {
     use HasFactory;
+    public $timestamps = false;
 
     protected $fillable = [
         'reservation_id',
+        'user_id',
+        'remind_at',
         'send_at',
         'sent_at',
     ];
 
     protected $casts = [
+        'remind_at' => 'datetime',
         'send_at' => 'datetime',
         'sent_at' => 'datetime',
     ];
 
+    public function setSendAtAttribute($value): void
+    {
+        $this->attributes['remind_at'] = $value;
+    }
+
+    public function getSendAtAttribute()
+    {
+        return $this->attributes['remind_at'] ?? null;
+    }
+
     public function reservation()
     {
         return $this->belongsTo(Reservation::class);