PostgreSQL bigint and int as PK?

Question

PostgreSQL

A lot of records will be stored in the database of the project I am developing.
In some tables there will be more than 2147483647 records, and therefore for these tables the PK type int is not suitable. There are not so many tables in which the number of records will exceed the maximum value of int.
Question: is it normal to use int in some tables and bigint as PK in some tables? Will it be possible in the future to change the type if it turns out that int is not enough for some table?

Answer 1

Yes, good. And yes, you can change it after, but keep in mind that for large tables it can take a long time.