app/api/routers/campaigns.py:332:        unsub = f"{cfg.PUBLIC_BASE_URL}/unsubscribe/{rec.unsub_token}" if c.unsubscribe_enabled else ""
=== config base url fields ===
15:    BASE_URL: str = "http://localhost:8000"
16:    FRONTEND_BASE_URL: str = "http://localhost:8000"
19:    DATABASE_URL: str = "postgresql+psycopg://mailer:mailer_dev_pw@localhost:5432/bulkmailer"
70:    UNSUBSCRIBE_BASE: str = ""  # defaults to BASE_URL