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: main.rs
    path of file: ./repos/peerdb/nexus/server/src
    
    the code of the file until where you have to start completion: use std::{
    collections::{HashMap, HashSet},
    fmt::Write,
    sync::Arc,
    time::Duration,
};

use analyzer::{PeerDDL, QueryAssociation};
use async_trait::async_trait;
use bytes::{BufMut, BytesMut};
use catalog::{Catalog, CatalogConfig, WorkflowDetails};
use clap::Parser;
use cursor::PeerCursors;
use dashmap::{mapref::entry::Entry as DashEnt
    
async fn run_migrations<'a>(config: &CatalogConfig<'a>) -> anyhow::Result<()> {
    // retry connecting to the catalog 3 times with 30 seconds delay
    // if it fails, return an error
    for _ in 0..3 {
        match Catalog::new(config.to_postgres_config()).await {
            Ok(mut catalog) => {
                catalog.run_migrations().await?;
                return Ok(());
            }
            Err(err) => {
                tracing::warn!(
                    "Failed to connect to catalog. Retrying in 30 seconds. {:?}",
                    err
                );
                tokio::time::sleep(Duration::from_secs(30)).await;
            }
        }
    }

    Err(anyhow::anyhow!("Failed to connect to catalog"))
}