update

app/Models/Customer.php

@@ -124,6 +124,27 @@ class Customer extends Authenticatable implements JWTSubject
         return $this->hasMany(ModuleVmware::class);
     }
 
+    /**
+     * Quan hệ N-N với DnsDomain (DNS Manager) qua bảng pivot dns_domain_user.
+     */
+    public function dnsDomain()
+    {
+        return $this->belongsToMany(
+            DnsDomain::class,
+            'dns_domain_user',
+            'user_id',
+            'domain_id',
+        )->withTimestamps();
+    }
+
+    /**
+     * Quan hệ với Service (tbl.services).
+     */
+    public function service()
+    {
+        return $this->hasMany(Service::class);
+    }
+
     /**
      * Quan hệ với Invoice.
      */

app/Models/DnsDomain.php

@@ -14,17 +14,11 @@ class DnsDomain extends Model
 
     protected $fillable = [
         'domain_name',
-        'user_id',
         'dns_manager_server_id',
         'is_created',
         'plesk_id',
     ];
 
-    public function user()
-    {
-        return $this->belongsTo(User::class);
-    }
-
     public function customer()
     {
         return $this->belongsToMany(Customer::class, 'dns_domain_user', 'domain_id', 'user_id')->withTimestamps();