Database URL different and not working

Question

I'm struggling to set up my Django project, it can't use the DATABSE_URL value the way it normally would. I get this error:

Traceback (most recent call last):
File "/opt/venv/lib/python3.10/site-packages/django/db/backends/base/base.py", line 275, in ensure_connection
self.connect()
File "/opt/venv/lib/python3.10/site-packages/django/utils/asyncio.py", line 26, in inner
return func(*args, **kwargs)
File "/opt/venv/lib/python3.10/site-packages/django/db/backends/base/base.py", line 256, in connect
self.connection = self.get_new_connection(conn_params)
File "/opt/venv/lib/python3.10/site-packages/django/utils/asyncio.py", line 26, in inner
return func(*args, **kwargs)
File "/opt/venv/lib/python3.10/site-packages/django/db/backends/postgresql/base.py", line 277, in get_new_connection
connection = self.Database.connect(**conn_params)
File "/opt/venv/lib/python3.10/site-packages/psycopg2/__init__.py", line 122, in connect
conn = _connect(dsn, connection_factory=connection_factory, **kwasync)
psycopg2.OperationalError: could not translate host name "postgres.railway.internal" to address: Name or service not known

I am using the following code to connect to the DB:

db_url = os.environ["DATABASE_URL"]
DATABASES = {"default": dj_database_url.parse(db_url, engine='django.db.backends.postgresql')}

This works great in another project I've deployed. But when I investigate the DATABASE_URL value in that project, it's different. Rather than using "postgres.railway.internal" it uses "roundhouse.proxy.rlwy.net"

Is this a recent change to database config on railway side, or am I just doing something wrong?