Frequently encountering 404 errors

[ObALive]

Multiple databases have been created, and when switching databases directly on the page, a 404 error occurs (http://localhost:5173/404). I have to access it directly via the URL (for example: http://localhost:5173/Mine). Additionally, accessing http://localhost:5173 also results in a 404 error. If one day I forget the name of the database, I will no longer be able to access my data (I have already tried two different storage methods)