import_default
This option controls whether column DEFAULT expressions are included in the definitions of foreign tables imported from a foreign server. The default is false. If you enable this option, be wary of defaults that might get computed differently on the local server than they would be on the remote server; nextval() is a common source of problems. The IMPORT will fail altogether if an imported default expression uses a function or operator that does not exist locally.
Du wirst da eine lokale Sequence erstellen müssen. Damit bei beidseitigen Inserts es nicht zu Kollisionen kommt, kannst Du die Sequencen mit unterschiedlichen Start- und Incrementwerten erstellen.