How to deploy a node.js application so that sessions are not reset?

Question

JavaScript

I have an application in which users can log into their personal account and I write to the user session
There was a question how to deploy the application without a full reboot
Because then the sessions are reset and the user is thrown out of the account
It is clear that development can be carried out locally, but when I upload it to prod I update the application of all users throws out
upd:
I set the session through express-session