from django.db import models class Report(models.Model): quantity = models.PositiveIntegerField(default=0) device = models.ForeignKey("management.Device", on_delete=models.PROTECT, null=True, blank=True) created_by = models.ForeignKey("accounts.User", on_delete=models.PROTECT, null=True, blank=True) created_at = models.DateTimeField(auto_now_add=True)