Misago/misago/legal/signals.py

from django.dispatch import receiver

from misago.users.signals import anonymize_user_data, username_changed

from .models import Agreement


@receiver([anonymize_user_data, username_changed])
def update_usernames(sender, **kwargs):
    Agreement.objects.filter(created_by=sender).update(
        created_by_name=sender.username,
    )

    Agreement.objects.filter(last_modified_by=sender).update(
        last_modified_by_name=sender.username,
    )