perhaps prepared-transactions might have some of the functionality you are looking for http://www.postgresql.org/docs/9.1/static/sql-prepare-transaction.html ht

perhaps prepared-transactions might have some of the functionality you are looking for http://www.postgresql.org/docs/9.1/static/sql-prepare-transaction.html http://www.postgresql.org/docs/9.1/static/sql-prepare-transa...