Thank you Melvin, I forgot to mention I've already found your script before I asked here, but I didn’t think it was robust enough (please don't offend :-). Particularly, it didn't work well on PostgreSQL 10.
Aldrin,
I apologize. I just tested and found that the reason it is failing is because, once again, the catalogs have been changed. In this case the structure of sequences.
I am trying to find a workaround. I will get back to you when I do.
