Postgres role permission problem
Your ALTER DEFAULT PRIVILEGES doesn't grant to "postgres" (unless "postgres" is also a member of "readwrite") and only grants for tables created by "postgres" (assuming you were logged on as "postgres" at the time you ran it).

Execute the ALTER DEFAULT PRIVILEGES again, this time while logged in as "confere".  And either grant "readwrite" to "postgres", or change the TO part of the ALTER DEFAULT PRIVILEGES.