You're expecting when updating the database it will auto-update in the frontend, while this is not possible.
There are many frameworks and libraries made to make this thing possible (easier) such as React.
Now, this is the general thing that happens, how would the front end even know that the database was updated? so you must add auto-refreshing code, or the user must reload the page.
Also server cant send a request to the frontend. And server responses cannot change the frontend, the thing that changes frontend after rendering is including a script in it.
Thats' it.