You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: postgres.rs
    path of file: ./repos/grafbase/engine/crates/integration-tests/src
    
    the code of the file until where you have to start completion: use std::{collections::HashMap, future::Future, panic::AssertUnwindSafe, sync::Arc};

use async_once_cell::OnceCell;
use engine::Response;
use futures::FutureExt;
use graphql_parser::parse_schema;
use indoc::formatdoc;
use postgres_connector_types::transport::{DirectTcpTransport, Transport, TransportExt};
use serde::de::DeserializeOwned;

use crate::{Engine, EngineBuilder};

// this is for creating/dropping databases, which _sho
    
    async fn new_namespaced(database: &str, name: &str) -> Self {
        let mut url = url::Url::parse(POOL_CONNECTION_STRING).unwrap();
        url.set_path(&format!("/{database}"));

        let connection_string = url.to_string();

        let schema = formatdoc! {r#"
            extend schema
              @postgres(
                name: "{name}",
                url: "{connection_string}",
                namespace: true
              )
        "#};

        Self::new_inner(schema, connection_string).await
    }