Have you used locking mechanisms in Django to manage concurrent access?

In Django, mechanisms such as database-level locks are often used to manage concurrent access. For example, the select_for_update() method allows locking selected records until the transaction is complete, preventing race conditions during concurrent updates.

Example of usage:

from django.db import transaction

with transaction.atomic():
    obj = MyModel.objects.select_for_update().get(pk=some_id)
    obj.field = 'new value'
    obj.save()

External locking mechanisms, such as Redis-based locks, can also be used if application-level locking is required. This helps avoid conflicts during parallel data processing.