app/Models/InvoiceReport.php

@@ -30,8 +30,17 @@ public static function boot(): void
 
         static::created(function ($model) {
             $model->attributes['internal_id'] = 'TN-INR-'.$model->id;
+
+            $invoices = Invoice::whereBetween('date', [$model->date_start, $model->date_end])
+                ->where('customer_id', $model->customer_id)->get()->pluck('id')->toArray();
+
+            $model->invoices()->sync($invoices);
+
             $model->save();
         });
+
+        // todo: sync all invoices within time and customer constraints
+
     }
 
     public function customer(): BelongsTo