Adding unique_together attribute after database is created

Hi,

I would like to add the unique_together attribute of the Meta class
for a model in my app.
My question is: my database already exists with several records, it is
possible to just add the attribute and not do anything in the database
level? does it work?

I have tried in a app using sqlite and another using postgres and it
worked. But I just wanted to get some confirmation.
I believe it does not affect the records I already have in the
database but only the newly created ones, I am right?

Is there any documentation page explaining this attribute in more
detail?

Thanks in advance.

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