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: pg_embed.rs
    path of file: ./repos/windmill/backend/src
    
    the code of the file until where you have to start completion: use pg_embed::pg_enums::PgAuthMethod;
use pg_embed::pg_fetch::PgFetchSettings;
use pg_embed::postgres::{PgEmbed, PgSettings};
use std::path::PathBuf;
use std::time::Duration;

pub async fn start() -> anyhow::Result<(String, PgEmbed)> {
    let pg_settings = PgSettings {
        database_dir: PathBuf::from("/tmp/db"),
        port: 6543,
        user: "postgres".to_string(),
        password: "password".to_string(),
        auth_method: PgAuthMethod::Plain,
        persistent: false,
        timeout: Some(Duration::from_secs(15)),
        migration_dir: None,
    };

    let fetch_settings = PgFetchSettings {
        version: pg_embed::pg_fetch::PostgresVersion("15.3.0"),

        ..Default::default()
    };

    tracing::info!(
        "Fetch settings: {:?} {:?}",
        fetch_settings.operating_system,
        fetch_settings.architecture
    );

    let mut pg = PgEmbed::new(pg_settings, fetch_settings).await?;

    pg.setup().await.expect("pg setup");

    pg.start_db().await.expect("pg start db");

    //TODO: re-enable this to make it work
    // if !pg
    
pub async fn start() -> anyhow::Result<(String, PgEmbed)> {
    let pg_settings = PgSettings {
        database_dir: PathBuf::from("/tmp/db"),
        port: 6543,
        user: "postgres".to_string(),
        password: "password".to_string(),
        auth_method: PgAuthMethod::Plain,
        persistent: false,
        timeout: Some(Duration::from_secs(15)),
        migration_dir: None,
    };

    let fetch_settings = PgFetchSettings {
        version: pg_embed::pg_fetch::PostgresVersion("15.3.0"),

        ..Default::default()
    };

    tracing::info!(
        "Fetch settings: {:?} {:?}",
        fetch_settings.operating_system,
        fetch_settings.architecture
    );

    let mut pg = PgEmbed::new(pg_settings, fetch_settings).await?;

    pg.setup().await.expect("pg setup");

    pg.start_db().await.expect("pg start db");

    //TODO: re-enable this to make it work
    // if !pg.database_exists("windmill").await.expect("db exists") {
    //     pg.create_database("windmill")
    //         .await
    //         .expect("pg create database");
    // }

    let uri = pg.full_db_uri("windmill");
    Ok((uri, pg))
}