I am creating backend application in nestjs. I had many entities. for MVP we created project with some fields in entity class. now due to change in functionalities we added more columns in the entity class. I had my legacy migration file. now to add addtional column what should be my approach.

1. Should I delete existing migration file and create new one?
2. can I generate only incremental file because I dont want to lose existing data. I mean for additional column alter command.
3. How can I generate migration for incremental changes? I know how to crearte migration file for entirte entity. thanks in advance.