Django: avoid “useless use of .all()”

Using the `.all()` method in Django's ORM is often unnecessary and can lead to slightly more code and performance overhead. The manager `Digger.objects` already refers to all `Digger` objects, making `.all()` redundant in most cases. Appropriate use cases for `.all()` include creating an all-inclusive queryset for future operations and confirming deletions of entire tables.