deleted unused import

backend/src/lib.rs

@@ -2,7 +2,7 @@ use axum::{
     routing::{get, post, put, delete},
     Router, middleware as axum_middleware,
 };
-use sea_orm::{Database, DatabaseConnection, DbErr};
+use sea_orm::{sqlx, Database, DatabaseConnection, DbErr};
 use sea_orm_migration::prelude::*;
 use std::net::SocketAddr;
 use utoipa::OpenApi;