seaorm-cli codegen maps col(big_unsigned(..)) to i64

Description

table clolumns with big_unsigned type get mapped to an i64 field during entity generation by seaorm-cli

Steps to Reproduce

1. create a Table in a migration up with a BigUnsigned column

#[async_trait::async_trait]
impl MigrationTrait for Migration {
    async fn up(&self, manager: &SchemaManager) -> Result<(), DbErr> {
        manager
            .create_table(
                Table::create()
                    .table(User::Table)
                    .if_not_exists()
                    .col(pk_auto(User::Id))
                    .col(big_unsigned(User::DiscordId))
                    .to_owned(),
            )
            .await
    }

    async fn down(&self, manager: &SchemaManager) -> Result<(), DbErr> {
        manager
            .drop_table(Table::drop().table(User::Table).to_owned())
            .await
    }
}

#[derive(DeriveIden)]
enum User {
    Table,
    Id,
    DiscordId,
}

2. run sea-orm-cli generate entity -o entity/src -l

generated user.rs:

//! `SeaORM` Entity, @generated by sea-orm-codegen 1.1.4

use sea_orm::entity::prelude::*;
use serde::{Deserialize, Serialize};

#[derive(Clone, Debug, PartialEq, DeriveEntityModel, Eq, Serialize, Deserialize)]
#[sea_orm(table_name = "user")]
pub struct Model {
    #[sea_orm(primary_key)]
    pub id: i32,
    pub discord_id: i64,
}

#[derive(Copy, Clone, Debug, EnumIter, DeriveRelation)]
pub enum Relation {}

impl ActiveModelBehavior for ActiveModel {}

Expected Behavior

pub discord_id: u64 in generated entity

Actual Behavior

pub discord_id: i64 in generated entity

Reproduces How Often

every time

Workarounds

Reproducible Example

see above

Versions

1.1.4

Reproduce the issue with the shown migration and the sea-orm-cli generate entity -o entity/src -l entry point. Compare the generated user.rs model with the migration's big_unsigned column; done means the generated discord_id field uses u64 instead of i64.