diff --git a/backend/src/controller/token.rs b/backend/src/controller/token.rs
index 28235364..937e3b8e 100644
--- a/backend/src/controller/token.rs
+++ b/backend/src/controller/token.rs
@@ -12,7 +12,7 @@ use tracing::instrument;
 use crate::{init::db::DB, report_internal};
 
 const CLEAN_DUR: time::Duration = time::Duration::from_secs(60 * 30);
-type Rand = [u8; 18];
+type Rand = [u8; 28];
 
 #[derive(Debug, thiserror::Error)]
 pub enum Error {
@@ -20,7 +20,7 @@ pub enum Error {
     Database(#[from] sea_orm::error::DbErr),
     #[error("expired")]
     Expired,
-    #[error("length of token is not 18")]
+    #[error("length of token is not 28")]
     InvalidTokenLength,
     #[error("`{0}`")]
     Base64(#[from] base64::DecodeError),
diff --git a/backend/src/init/db.rs b/backend/src/init/db.rs
index 3426c69e..1b2f6db9 100644
--- a/backend/src/init/db.rs
+++ b/backend/src/init/db.rs
@@ -21,6 +21,7 @@ pub async fn init(config: &GlobalConfig) {
         .await
         .expect("fail connecting to database");
     init_user(config, &db).await;
+    DB.set(db).ok();
 }
 fn hash(config: &GlobalConfig, src: &str) -> Vec<u8> {
     digest::digest(
diff --git a/justfile b/justfile
index cb811395..3838ed61 100644
--- a/justfile
+++ b/justfile
@@ -12,7 +12,7 @@ dev-judger:
 
 prepare:
     mkdir -p cert
-    openssl req -x509 -newkey rsa:4096 -keyout cert/key.pem -out cert/cert.pem -sha256 -days 3650 -nodes -subj "/C=XX/ST=StateName/L=CityName/O=CompanyName/OU=CompanySectionName/CN=CommonNameOrHostname"
+    openssl req -x509 -newkey rsa:4096 -keyout cert/key.pem -out cert/cert.pem -sha256 -days 3650 -nodes -subj "/C=XX/ST=StateName/L=CityName/O=CompanyName/OU=CompanySectionName/CN=localhost"
 
 clean:
     cd ./frontend && yarn cache clean