Dockerize PostgreSQL database with existing data

I'm trying to dockerize my Django project, but my database container seems to not be working. When I initialize docker-compose up the server starts but there is a message telling me I have 53 unapplied migrations (all), and run python manage.py migrate to migrate (like it is a blank database). My docker-compose looks like this:

services:
  db:
    image: postgres
    volumes:
      - ./data/db:/var/lib/postgresql/data
    environment:
      - POSTGRES_DB=database_name
      - POSTGRES_USER=database_admin
      - POSTGRES_PASSWORD=pskfnbiu42834h
  web:
    build: .
    command: python manage.py runserver 0.0.0.0:8000
    volumes:
      - .:/code
    ports:
      - "8000:8000"
    environment:
      - POSTGRES_DB=database_name
      - POSTGRES_USER=database_admin
      - POSTGRES_PASSWORD=pskfnbiu42834h
    depends_on:
      - db

And I changed my settings.py DATABASE to this:

DATABASES = {
    'default': {
        'ENGINE': 'django.db.backends.postgresql_psycopg2',
        'NAME': os.environ.get('POSTGRES_NAME'),
        'USER': os.environ.get('POSTGRES_USER'),
        'PASSWORD': os.environ.get('POSTGRES_PASSWORD'),
        'HOST': 'db',
        'PORT': '5432',
    }
}

I think the problem might have to do with the volumes part. Docker created a data folder in my project directory with PostgreSQL related files. Where do those /var/lib/ folder live? Anyone can give any orientation?

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