fix some warnings

src/models.rs

@@ -389,7 +389,7 @@ impl User {
     }
 
     pub async fn get_by_token(db: &Db, token: &str) -> Option<Self> {
-        let mut cacher = UserCache::init(token);
+        let cacher = UserCache::init(token);
         if let Some(u) = cacher.get().await {
             return Some(u);
         }
@@ -406,7 +406,7 @@ impl User {
             _ => token,
         };
         // dbg!(token);
-        let mut cacher = UserCache::init(token);
+        let cacher = UserCache::init(token);
         if let Some(u) = cacher.get().await {
             Some(u)
         } else {