How to update a database according to SignalR?

First of all, I work according to this guide: Creating a simple real-time chat with .NET Core, ReactJS and SignalR https://medium.com/swlh/creating-a-simple-real-time-chat-with-net-core-reactjs-and-signalr-6367dcadd2c6

(Tip: Highly recommended guide. Easy and understandable)

I did this guide, it works great.

And now for real life ...

I have a blog. My blog currently has a database that I call with axios and it is stored in a database. But it is not updated when there is a change in the database.

I want to upgrade the site and receive an alert message every time there is an update in the system (new post, new comment, new like, etc.)

I did not quite understand how to combine this.

I thought (according to the division of the above guide) in the chat.js component

connection
      .start ()
      .then ((result) => {
        connection.on ("ReceiveMessage", (message) => {
          const updatedChat = [... latestChat.current];
          updatedChat.push (message);
          ** setNew (true); <-------- **
          setChat (updatedChat);
        });
      })

Set him to get new data to change state to true and then it will access a database to get new information through the axios.

I think it's cumbersome, is there a way to define it directly?