How to use sequilize correctly with express and postgreSQL

Question

I have a question about using post-fat sequil in express in a more correct way.

E.g: Is it better to use clichés and migrate through an automatic command and model or do you do the manual model yourself? My next question is: can I run migrations if I do the data from the automated model? I didn't find a production project to be inspired by, but the cliché method doesn't seem exactly right from many points of view. I would like to make the models manually and then run a migration Can you give me an example of a production project or a resource where I could get these examples?

I would like this from someone with experience in express and who uses it daily in projects