不需要迁移，您需要做的是创建正确的ContentType条目，这是Permission模型所需的字段。
一旦你这样做：

from django.contrib.contenttypes.models import ContentType

ContentType.objects.get_for_model(Report)

...在幕后执行get_or_create，然后在添加权限时，您将看到对应的条目report作为内容类型。
顺便说一句，如果你只是为了获得权限而使用它，你也可以将abstract = True添加到你的报表模型的Meta中，这样它就不会为它创建一个数据库表。如果你这样做，你必须传递关键字参数for_concrete_model。下面是一个示例代码：

from django.contrib.auth.models import Permission
from django.contrib.contenttypes.models import ContentType
from django.db import models

# This is an abstract model that exists only so that we can create a ContentType
# for which can attach permissions to it.
# There is no database table created for it
class CustomPermissions(models.Model):
    class Meta:
        abstract = True

def sync_custom_permissions():
    content_type = ContentType.objects.get_for_model(
                                        CustomPermissions,
                                        for_concrete_model=False)

    permissions = [
        ("can_eat_pizza", "Can Eat Pizza"),
        ("can_deliver_pizza", "Can Deliver Pizza"),
        ("can_view_feature_flags", "Can View Feature Flags"),
        ("can_update_feature_flags", "Can Update Feature Flags"),
    ]

    for codename, name in permissions:
        Permission.objects.get_or_create(name=name,
                                         codename=codename,
                                         content_type=content_type)