> No. PostgreSQL may remove a dead row, but a dead row is by definition
> no longer visible, so it wouldn't be found by a query.
I am wondering whether it is a good practice to use CTID in a where
clause. years ago when I use to code in Informix, using ROWID as a
generic substitute for primary key was discouraged precisely for the
same reason as described here for CTID. Sometimes rowid can change under
concurrent updates.