Added 'updated_at' column into productionQuantityImporter

app/Filament/Imports/ProductionQuantityImporter.php

@@ -54,6 +54,11 @@ class ProductionQuantityImporter extends Importer
                 ->label('Plant Name')
                 ->relationship(resolveUsing:'name')
                 ->rules(['required']),
+            ImportColumn::make('updated_at')
+                ->requiredMapping()
+                ->exampleHeader('Updated DateTime')
+                ->label('Updated DateTime')
+                ->rules(['required']),
         ];
     }