Did you mean migration signals (pre_migrate and post_migrate)? They are only meant to run before and after the whole migration operation, regardless of how many steps are executed. They don't trigger for each individual migration operation.

The only catch is they will run multiple times, once for each app, but that can also be prevented by passing a sender (e.g. `pre_migrate.connect(pre_migrate_signal_handler, sender=self)` if you are registering them in your AppConfig.ready method).