try/catch for operational error

- Database might not yet be ready to load models

InvenTree/plugin/builtin/integration/mixins.py

@@ -135,6 +135,7 @@ class ScheduleMixin:
         Register the tasks with the database
         """
 
+        try:
             from django_q.models import Schedule
 
             for key, task in self.scheduled_tasks.items():
@@ -153,12 +154,16 @@ class ScheduleMixin:
                         minutes=task.get('minutes', None),
                         repeats=task.get('repeats', -1),
                     )
+        except OperationalError:
+            # Database might not yet be ready
+            pass
 
     def unregister_tasks(self):
         """
         Deregister the tasks with the database
         """
 
+        try:
             from django_q.models import Schedule
 
             for key, task in self.scheduled_tasks.items():
@@ -170,6 +175,9 @@ class ScheduleMixin:
                     scheduled_task.delete()
                 except Schedule.DoesNotExist:
                     pass
+        except OperationalError:
+            # Database might not yet be ready
+            pass
 
 
 class UrlsMixin:

InvenTree/plugin/registry.py

@@ -301,7 +301,6 @@ class PluginsRegistry:
         logger.info('Activating plugin tasks')
 
         from common.models import InvenTreeSetting
-        from django_q.models import Schedule
 
         # List of tasks we have activated
         task_keys = []
@@ -323,6 +322,9 @@ class PluginsRegistry:
 
         # Remove any scheduled tasks which do not match
         # This stops 'old' plugin tasks from accumulating
+        try:
+            from django_q.models import Schedule
+
             scheduled_plugin_tasks = Schedule.objects.filter(name__istartswith="plugin.")
 
             deleted_count = 0
@@ -334,6 +336,9 @@ class PluginsRegistry:
 
             if deleted_count > 0:
                 logger.info(f"Removed {deleted_count} old scheduled tasks")
+        except OperationalError:
+            # Database might not yet be ready
+            pass
 
     def deactivate_integration_schedule(self):
         pass