According to this link , it says that it's recommended to create new tables for new module. Is it true about the existing entities? (like customer, cart, product etc.)
I think we should not create new tables for somethings like these cases, and we should modify the existing tables (e.g to add a field to customer table).
Is it true?
And when we modify the existing tables, should we override the classes? (e.g we want to add a field to customer, should we modify the corresponding class for customer- for active records)