Recreate all foreign keys in all tables as deferrable (batch)
You can do this by generating the necessary script. 

select 'alter table '||quote_ident(ns.nspname)||'.'||quote_ident(tb.relname)||
       ' drop constraint '||quote_ident(conname)||';'||chr(10)||
       'alter table '||quote_ident(ns.nspname)||'.'||quote_ident(tb.relname)||
       ' add constraint '||quote_ident(conname)||' '||
       pg_get_constraintdef(c.oid, true)||' deferrable initially immediate;' as ddl
from pg_constraint c
  join pg_class tb on tb.oid = c.conrelid
  join pg_namespace ns on ns.oid = tb.relnamespace
where ns.nspname in ('public')   --&lt;&lt;&lt; adjust the schema name(s) here
 and c.contype = 'f';


Spool the output of the above statement into a file and then run that generated script.