django auditlog migration error with multiple MySQL databases

project_manage.py

#!/usr/bin/env python
import os
import sys

if __name__ == "__main__":
    os.environ.setdefault("DJANGO_SETTINGS_MODULE", "project.settings")
    try:
        from django.core.management import execute_from_command_line
    except ImportError:
        # The above import may fail for some other reason. Ensure that the
        # issue is really that Django is missing to avoid masking other
        # exceptions on Python 2.
        try:
            import django
        except ImportError:
            raise ImportError(
                "Couldn't import Django. Are you sure it's installed and "
                "available on your PYTHONPATH environment variable? Did you "
                "forget to activate a virtual environment?"
            )
        raise
    execute_from_command_line(sys.argv)

project_pip_requirements.txt

Django==1.11.6
django-audit-log==0.7.0
mysqlclient==1.3.12
pytz==2017.3

project_project_database_routers.py

class SecondRouter(object):
    """
    A router to control all database operations on models in the
    primer app.
    """
    def db_for_read(self, model, **hints):
        """
        Attempts to read primer_db models go to primer_db.
        """
        if model._meta.app_label == 'second':
            return 'second'
        return None

    def db_for_write(self, model, **hints):
        """
        Attempts to write primer_db models go to primer_db.
        """
        if model._meta.app_label == 'second':
            return 'second'
        return None

    def allow_relation(self, obj1, obj2, **hints):
        """
        Allow relations if a model in the primer_db app is involved.
        """
        if (obj1._meta.app_label == 'second'
           or obj2._meta.app_label == 'second'):
           return True
        return None

    def allow_migrate(self, db, app_label, model_name=None, **hints):
        """
        Make sure the primer_db app only appears in the 'primer_db'
        database.
        """
        if db == 'second':
            return app_label == 'second'
        elif app_label == 'second':
            return False
        return None

project_project_settings.py

"""
Django settings for project.

Generated by 'django-admin startproject' using Django 1.11.6.

For more information on this file, see
https://docs.djangoproject.com/en/1.11/topics/settings/

For the full list of settings and their values, see
https://docs.djangoproject.com/en/1.11/ref/settings/
"""

import os

# Build paths inside the project like this: os.path.join(BASE_DIR, ...)
BASE_DIR = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))


# Quick-start development settings - unsuitable for production
# See https://docs.djangoproject.com/en/1.11/howto/deployment/checklist/

# SECURITY WARNING: keep the secret key used in production secret!
SECRET_KEY = 'o+bv-2mg9h0#kzkmpzbh!e$l*y3#-rrn5w7^fp8+ad$2wf*pz$'

# SECURITY WARNING: don't run with debug turned on in production!
DEBUG = True

ALLOWED_HOSTS = []


# Application definition

INSTALLED_APPS = [
    'django.contrib.admin',
    'django.contrib.auth',
    'django.contrib.contenttypes',
    'django.contrib.sessions',
    'django.contrib.messages',
    'django.contrib.staticfiles',
    'second'
]

MIDDLEWARE = [
    'django.middleware.security.SecurityMiddleware',
    'django.contrib.sessions.middleware.SessionMiddleware',
    'django.middleware.common.CommonMiddleware',
    'django.middleware.csrf.CsrfViewMiddleware',
    'django.contrib.auth.middleware.AuthenticationMiddleware',
    'django.contrib.messages.middleware.MessageMiddleware',
    'django.middleware.clickjacking.XFrameOptionsMiddleware',
    'audit_log.middleware.UserLoggingMiddleware',
]

ROOT_URLCONF = 'project.urls'

DATABASE_ROUTERS = ['project.database_routers.SecondRouter']

TEMPLATES = [
    {
        'BACKEND': 'django.template.backends.django.DjangoTemplates',
        'DIRS': [os.path.join(BASE_DIR, 'templates')]
        ,
        'APP_DIRS': True,
        'OPTIONS': {
            'context_processors': [
                'django.template.context_processors.debug',
                'django.template.context_processors.request',
                'django.contrib.auth.context_processors.auth',
                'django.contrib.messages.context_processors.messages',
            ],
        },
    },
]

WSGI_APPLICATION = 'project.wsgi.application'


# Database
# https://docs.djangoproject.com/en/1.11/ref/settings/#databases

DATABASES = {
    'default': {
        'ENGINE': 'django.db.backends.mysql',
        'NAME': 'auth',
        'USER': 'example',
        'PASSWORD': 'password',
        'HOST': '127.0.0.1',
        'PORT': '3306', },
    'second': {
        'ENGINE': 'django.db.backends.mysql',
        'NAME': 'second',
        'USER': 'example',
        'PASSWORD': 'password',
        'HOST': '127.0.0.1',
        'PORT': '3306', }
}



# Password validation
# https://docs.djangoproject.com/en/1.11/ref/settings/#auth-password-validators

AUTH_PASSWORD_VALIDATORS = [
    {
        'NAME': 'django.contrib.auth.password_validation.UserAttributeSimilarityValidator',
    },
    {
        'NAME': 'django.contrib.auth.password_validation.MinimumLengthValidator',
    },
    {
        'NAME': 'django.contrib.auth.password_validation.CommonPasswordValidator',
    },
    {
        'NAME': 'django.contrib.auth.password_validation.NumericPasswordValidator',
    },
]


# Internationalization
# https://docs.djangoproject.com/en/1.11/topics/i18n/

LANGUAGE_CODE = 'en-us'

TIME_ZONE = 'UTC'

USE_I18N = True

USE_L10N = True

USE_TZ = True


# Static files (CSS, JavaScript, Images)
# https://docs.djangoproject.com/en/1.11/howto/static-files/

STATIC_URL = '/static/'

project_project_urls.py

"""audit_log URL Configuration

The `urlpatterns` list routes URLs to views. For more information please see:
    https://docs.djangoproject.com/en/1.11/topics/http/urls/
Examples:
Function views
    1. Add an import:  from my_app import views
    2. Add a URL to urlpatterns:  url(r'^$', views.home, name='home')
Class-based views
    1. Add an import:  from other_app.views import Home
    2. Add a URL to urlpatterns:  url(r'^$', Home.as_view(), name='home')
Including another URLconf
    1. Import the include() function: from django.conf.urls import url, include
    2. Add a URL to urlpatterns:  url(r'^blog/', include('blog.urls'))
"""
from django.conf.urls import url
from django.contrib import admin

urlpatterns = [
    url(r'^admin/', admin.site.urls),
]

project_project_wsgi.py

"""
WSGI config for audit_log project.

It exposes the WSGI callable as a module-level variable named ``application``.

For more information on this file, see
https://docs.djangoproject.com/en/1.11/howto/deployment/wsgi/
"""

import os

from django.core.wsgi import get_wsgi_application

os.environ.setdefault("DJANGO_SETTINGS_MODULE", "audit_log.settings")

application = get_wsgi_application()

project_second_migrations_0001_initial.py

# -*- coding: utf-8 -*-
# Generated by Django 1.11.6 on 2017-11-01 09:10
from __future__ import unicode_literals

import audit_log.models.fields
from django.conf import settings
from django.db import migrations, models
import django.db.models.deletion
import django.utils.timezone


class Migration(migrations.Migration):

    initial = True

    dependencies = [
        migrations.swappable_dependency(settings.AUTH_USER_MODEL),
    ]

    operations = [
        migrations.CreateModel(
            name='Example',
            fields=[
                ('id', models.AutoField(primary_key=True, serialize=False)),
                ('is_example', models.BooleanField(default=False)),
            ],
        ),
        migrations.CreateModel(
            name='ExampleAuditLogEntry',
            fields=[
                ('id', models.IntegerField(blank=True, db_index=True)),
                ('is_example', models.BooleanField(default=False)),
                ('action_id', models.AutoField(primary_key=True, serialize=False)),
                ('action_date', models.DateTimeField(default=django.utils.timezone.now, editable=False)),
                ('action_type', models.CharField(choices=[('I', 'Created'), ('U', 'Changed'), ('D', 'Deleted')], editable=False, max_length=1)),
                ('action_user', audit_log.models.fields.LastUserField(editable=False, null=True, on_delete=django.db.models.deletion.CASCADE, related_name='_example_audit_log_entry', to=settings.AUTH_USER_MODEL)),
            ],
            options={
                'ordering': ('-action_date',),
                'default_permissions': (),
            },
        ),
    ]

project_second_models.py

from django.db import models

from audit_log.models.managers import AuditLog


class Example(models.Model):
    id = models.AutoField(primary_key=True)
    is_example = models.BooleanField(default=False)
    audit_log = AuditLog()