When you rename a study in the browser on e.g "$optuna-dashboard sqlite:///highlight.db --port 8080", the user attributes set by study.set_user_attr (not trial.set_user_attr), the user attributes disappears.
How to Reproduce
Add some user attributes to your study
Run the study for some trials
Open web-browser and review results and additional study user attributes
Rename the study for e.g further storage and completion check
Description
When you rename a study in the browser on e.g "$optuna-dashboard sqlite:///highlight.db --port 8080", the user attributes set by study.set_user_attr (not trial.set_user_attr), the user attributes disappears.
How to Reproduce
Python version
3.10.9
Optuna version
3.6.1
optuna-dashboard version or git revision
0.15.1
Web browser
Firefox