How to add increment primary key in an existing PostgreSQL table?

[DesmondSol]

when creating my tables in the hasura console i forgot to make the id auto incremental for all the tables i used and after that when i tried to change them all to that there wasn't any easy way available i could find so i had to create alter statements for all the tables on the raw sql to do my tasks but since that is a lot of work can i ask if there is a better way already made.
How to add increment primary key in an existing PostgreSQL table?