How to migrate a website to Symfony?

Question

MySQL

Our company converted an old self-written site to the Symfony framework, everything has undergone a change.
Now there is a question of transfer. You need to transfer the entire database and files so as not to lose search traffic. What should be considered when transferring? And what is the best way to do it?
Should I migrate keeping all ids the same or keep the old id in a separate field?

Answer 1

it is desirable to keep the old urls, or at least that they are redirected to the right place.
If you can save everything under the old id, save it, if not, then an additional field as an option.

Answer 2

A person here shares his experience https://habrahabr.ru/post/252405/