<commit_before>from django.db import models


class DBMutex(models.Model):
    """
    Models a mutex lock with a lock ID and a creation time.
    """
    lock_id = models.CharField(max_length=256, unique=True)
    creation_time = models.DateTimeField(auto_now_add=True)<commit_msg>Specified params for mutex model<commit_after>from django.db import models


class DBMutex(models.Model):
    """
    Models a mutex lock with a ``lock_id`` and a ``creation_time``.
    """
    lock_id = models.CharField(max_length=256, unique=True)
    creation_time = models.DateTimeField(auto_now_add=True)
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