How to implement patches for a project?

I am working on a NodeJs, AngularJs and MongoDB app. Every time I made some changes in the existing DB design I create a new route to update the existing records. I am new in web development and still learning new ways to improve my skills.

In my current issue, I made few changes in the Model design by introducing new fields and removing few other fields. I got the solution to update the DB design by mongoose for each or async for each.

But I want to implement a solution in which when an admin login he can see the new patches available and the old one installed.

Any suggestion which can point me into the right direction will be really helpful.