'How to keep List Items with new deployment for SharePoint AddIn

I´ve got a problem! I am trying to develop an Programm for my company for our SharePoint. I have to develope some SharePoint Lists so that we can use them online.

I can add some new Items at my Sharepoint and save them, but whenever I have to do some new things within my code and I deploy my newest version, every entry I added is deleted!

Hopefully someone can help me with that! I develop with Visual Studio and there I go with SharePoint Online. When you need some code tell me, i will show you what I have!

Thank you for reading!



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