How to roll out migrations in production?

Question

MySQL

Good day. Please tell me how to perform production migrations without data loss?
Let's say I have a users migration, during development I added a couple of fields there, and the site is already up and running in full. How to perform painless migration (i.e. without data loss) in production?

Answer 1

It is necessary to create a new migration that adds this pair of fields, and not edit the existing one.