Do I need to reinstall app after the app process restarts on the server

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Sorry for my beginner questions...
I played around with the node Shopify app cli, but was wondering... everytime I restart the app process with "shopify serve", I need to follow the link stated in the terminal
"* To install and start using your app, open this URL in your browser:"
or hit the app up on the Apps page (which auto-logs in and creates a session). Otherwise my shop doesnt seem to be able to connect.
I assume that is because there is no session anymore after restart.
I feel that being a bit weird or maybe I misunderstand something...? What if the app is installed in 50 shops and my server restarts?