djangoにmysqlを導入した後からmigrateできない・・・

Question

DjangoアプリにMySQLを導入したが、それ以降「$ python manage.py migrate」を実行すると、
以下のエラー文が出ます。

$ python manage.py migrate  

Traceback (most recent call last):
  File "manage.py", line 21, in <module>
    main()
  File "manage.py", line 17, in main
    execute_from_command_line(sys.argv)
  File "/Users/masa/fashionrecommend/venv/lib/python3.7/site-packages/django/core/management/__init__.py", line 401, in execute_from_command_line
    utility.execute()
  File "/Users/masa/fashionrecommend/venv/lib/python3.7/site-packages/django/core/management/__init__.py", line 395, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "/Users/masa/fashionrecommend/venv/lib/python3.7/site-packages/django/core/management/base.py", line 328, in run_from_argv
    self.execute(*args, **cmd_options)
  File "/Users/masa/fashionrecommend/venv/lib/python3.7/site-packages/django/core/management/base.py", line 369, in execute
    output = self.handle(*args, **options)
  File "/Users/masa/fashionrecommend/venv/lib/python3.7/site-packages/django/core/management/base.py", line 83, in wrapped
    res = handle_func(*args, **kwargs)
  File "/Users/masa/fashionrecommend/venv/lib/python3.7/site-packages/django/core/management/commands/migrate.py", line 86, in handle
    executor = MigrationExecutor(connection, self.migration_progress_callback)
  File "/Users/masa/fashionrecommend/venv/lib/python3.7/site-packages/django/db/migrations/executor.py", line 18, in __init__
    self.loader = MigrationLoader(self.connection)
  File "/Users/masa/fashionrecommend/venv/lib/python3.7/site-packages/django/db/migrations/loader.py", line 49, in __init__
    self.build_graph()
  File "/Users/masa/fashionrecommend/venv/lib/python3.7/site-packages/django/db/migrations/loader.py", line 212, in build_graph
    self.applied_migrations = recorder.applied_migrations()
  File "/Users/masa/fashionrecommend/venv/lib/python3.7/site-packages/django/db/migrations/recorder.py", line 76, in applied_migrations
    if self.has_table():
  File "/Users/masa/fashionrecommend/venv/lib/python3.7/site-packages/django/db/migrations/recorder.py", line 56, in has_table
    return self.Migration._meta.db_table in self.connection.introspection.table_names(self.connection.cursor())
  File "/Users/masa/fashionrecommend/venv/lib/python3.7/site-packages/django/utils/asyncio.py", line 26, in inner
    return func(*args, **kwargs)
  File "/Users/masa/fashionrecommend/venv/lib/python3.7/site-packages/django/db/backends/base/base.py", line 260, in cursor
    return self._cursor()
  File "/Users/masa/fashionrecommend/venv/lib/python3.7/site-packages/django/db/backends/dummy/base.py", line 20, in complain
    raise ImproperlyConfigured("settings.DATABASES is improperly configured. "
django.core.exceptions.ImproperlyConfigured: settings.DATABASES is improperly configured. Please supply the ENGINE value. Check settings documentation for more details.

データベース周りの設定が違うとのことですが、どこがどう違うのかが分からず・・・
どなたかお教えいただけたら幸いです。

settings.py

"""
Django settings for fashion_app project.

Generated by 'django-admin startproject' using Django 3.0.6.

For more information on this file, see
https://docs.djangoproject.com/en/3.0/topics/settings/

For the full list of settings and their values, see
https://docs.djangoproject.com/en/3.0/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/3.0/howto/deployment/checklist/

# SECURITY WARNING: keep the secret key used in production secret!
SECRET_KEY = ''

# 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',
    "recommend_app"
]

MIDDLEWARE = [
    'django.middleware.security.SecurityMiddleware',
    'whitenoise.middleware.WhiteNoiseMiddleware',
    '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',
]

ROOT_URLCONF = 'fashion_app.urls'

TEMPLATES = [
    {
        'BACKEND': 'django.template.backends.django.DjangoTemplates',
        'DIRS': [os.path.normpath(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 = 'fashion_app.wsgi.application'

import dj_database_url
db_from_env = dj_database_url.config()
DATABASES = {
    'default': dj_database_url.config()
}


# Database
# https://docs.djangoproject.com/en/3.0/ref/settings/#databases



# Password validation
# https://docs.djangoproject.com/en/3.0/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/3.0/topics/i18n/

LANGUAGE_CODE = 'ja'

TIME_ZONE = 'Asia/Tokyo'

USE_I18N = True

USE_L10N = True

USE_TZ = True


# Static files (CSS, JavaScript, Images)
# https://docs.djangoproject.com/en/3.0/howto/static-files/

STATIC_URL = '/static/'
STATICFILES_DIRS = [
    os.path.join(BASE_DIR, 'static'),
]
STATIC_ROOT = os.path.join(BASE_DIR, 'fashion_app/static')

from socket import gethostname
hostname = gethostname()

if "masa" in hostname:
    # デバッグ環境
    DEBUG = True
#=====ここから...=====
    import pymysql
    pymysql.install_as_MySQLdb()

    DATABASES = {
        'default': {
            #'ENGINE': 'django.db.backends.sqlite3',
            #'NAME': os.path.join(BASE_DIR, 'db.sqlite3'),
             "ENGINE": "django.db.backends.mysql",
             "NAME": "sample",
             "USER": "root",
             "PASSWORD": "root",
             "HOST": "127.0.0.1",
             "PORT": "3306",
        }
    }
#=====...ここまでは、使用しているデータベースに置き換えてください。=====
    ALLOWED_HOSTS = []
else:
    # 本番環境
    DEBUG = True
    LOGGING = {
        'version': 1,
        'disable_existing_loggers': False,
        'handlers': {
            'console': {
                'class': 'logging.StreamHandler',
            },
        },
        'loggers': {
            'django': {
                'handlers': ['console'],
                'level': os.getenv('DJANGO_LOG_LEVEL', 'DEBUG'),
            },
        },
    }

    # DB設定
    import dj_database_url
    PROJECT_ROOT = os.path.dirname(os.path.abspath(__file__))
    db_from_env = dj_database_url.config()
    DATABASES = {
        'default': dj_database_url.config()
    }
    ALLOWED_HOSTS = ['*']

local_settings.py


import os

BASE_DIR = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))

import pymysql
pymysql.install_as_MySQLdb()

DATABASES = {
    'default': {
        #'ENGINE': 'django.db.backends.sqlite3',
        #'NAME': os.path.join(BASE_DIR, 'db.sqlite3'),
        "ENGINE": "django.db.backends.mysql",
        "NAME": "sample",
        "USER": "root",
        "PASSWORD": "root",
        "HOST": "127.0.0.1",
        "PORT": "3306",
    }
}

DEBUG = True