def METHOD_NAME() -> dict:
    """Load configuration from environment variables."""
    cfg = {
        "postgres_host": os.getenv("POSTGRES_HOST"),
        "postgres_port": os.getenv("POSTGRES_PORT"),
        "postgres_db": os.getenv("POSTGRES_DB"),
        "postgres_user": os.getenv("POSTGRES_USER"),
        "postgres_password": os.getenv("POSTGRES_PASSWORD"),
        "data_dir": os.getenv("OQAPI_DATA_DIR"),
        "geom_size_limit": os.getenv("OQAPI_GEOM_SIZE_LIMIT"),
        "ohsome_api": os.getenv("OQAPI_OHSOME_API"),
        "concurrent_computations": os.getenv("OQAPI_CONCURRENT_COMPUTATIONS"),
        "user_agent": os.getenv("OQAPI_USER_AGENT"),
    }
    return {k: v for k, v in cfg.items() if v is not None}