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: m20221031_000001_add_error_column_to_crawl_queue.rs
    path of file: ./repos/spyglass/crates/migrations/src
    
    the code of the file until where you have to start completion: use entities::models::crawl_queue;
use sea_orm_migration::prelude::*;

pub struct Migration;

impl 
    
    async fn up(&self, manager: &SchemaManager) -> Result<(), DbErr> {
        // Add error column
        manager
            .alter_table(
                Table::alter()
                    .table(crawl_queue::Entity)
                    .add_column(ColumnDef::new(Alias::new("error")).string())
                    .to_owned(),
            )
            .await?;

        Ok(())
    }