refactor: update user relationship in PushSubscription model and clean up User model attributes

app/Models/PushSubscription.php

@@ -6,14 +6,15 @@
 use Illuminate\Database\Eloquent\Factories\HasFactory;
 use Illuminate\Database\Eloquent\Model;
 use Illuminate\Database\Eloquent\Relations\BelongsTo;
+use Illuminate\Database\Eloquent\Relations\MorphTo;
 
 #[Guarded(['id'])]
 class PushSubscription extends Model
 {
     use HasFactory;
 
-    public function user(): BelongsTo
+    public function user(): MorphTo
     {
-        return $this->belongsTo(User::class);
+        return $this->morphTo();
     }
 }

app/Models/User.php

@@ -10,6 +10,7 @@
 use Illuminate\Database\Eloquent\Factories\HasFactory;
 use Illuminate\Database\Eloquent\Relations\HasMany;
 use Illuminate\Database\Eloquent\Relations\HasOne;
+
 use Illuminate\Database\Eloquent\SoftDeletes;
 use Illuminate\Foundation\Auth\User as Authenticatable;
 use Illuminate\Notifications\Notifiable;
@@ -181,11 +182,6 @@ public function purchaseItems(): HasMany
         return $this->hasMany(PurchaseItem::class);
     }
 
-    public function pushSubscriptions(): HasMany
-    {
-        return $this->hasMany(PushSubscription::class);
-    }
-
     public function rejections(): HasMany
     {
         return $this->hasMany(Rejection::class, 'rejected_by_id');