fix: account username changing

crates/core/src/database/auth.rs

@@ -422,7 +422,7 @@ impl DataManager {
         let res = execute!(
             &conn,
             "UPDATE users SET username = $1 WHERE id = $2",
-            params![&to.as_str(), &(id as i64)]
+            params![&to.to_lowercase(), &(id as i64)]
         );
 
         if let Err(e) = res {
@@ -430,7 +430,6 @@ impl DataManager {
         }
 
         self.cache_clear_user(&user).await;
-
         Ok(())
     }