Update callback when base currency is adjusted (#6243)

* Update callback when base currency is adjusted

- Schedule recalculation of part pricing

* Revert old changes

InvenTree/common/models.py

@@ -1102,16 +1102,26 @@ def currency_exchange_plugins():
     return [('', _('No plugin'))] + [(plug.slug, plug.human_name) for plug in plugs]
 
 
-def update_exchange_rates(setting):
-    """Update exchange rates when base currency is changed."""
+def after_change_currency(setting):
+    """Callback function when base currency is changed.
+
+    - Update exchange rates
+    - Recalculate prices for all parts
+    """
     if InvenTree.ready.isImportingData():
         return
 
     if not InvenTree.ready.canAppAccessDatabase():
         return
 
+    from part import tasks as part_tasks
+
+    # Immediately update exchange rates
     InvenTree.tasks.update_exchange_rates(force=True)
 
+    # Offload update of part prices to a background task
+    InvenTree.tasks.offload_task(part_tasks.check_missing_pricing, force_async=True)
+
 
 def reload_plugin_registry(setting):
     """When a core plugin setting is changed, reload the plugin registry."""
@@ -1212,7 +1222,7 @@ def save(self, *args, **kwargs):
             'description': _('Select base currency for pricing calculations'),
             'default': 'USD',
             'choices': CURRENCY_CHOICES,
-            'after_save': update_exchange_rates,
+            'after_save': after_change_currency,
         },
         'CURRENCY_UPDATE_INTERVAL': {
             'name': _('Currency Update Interval'),
@@ -2753,7 +2763,7 @@ def notify(cls, key: str, uid: int):
 
 
 class NotificationMessage(models.Model):
-    """A NotificationMessage is a message sent to a particular user, notifying them of some *important information*.
+    """A NotificationMessage is a message sent to a particular user, notifying them of some important information.
 
     Notification messages can be generated by a variety of sources.