Core team member Magnus gave an excellent presentation at PGConf this year about how to achieve that with PG triggers and schemas: http://www.pgconf.us/2015/eve

Core team member Magnus gave an excellent presentation at PGConf this year about how to achieve that with PG triggers and schemas: http://www.pgconf.us/2015/event/60/ http://www.pgconf.us/2015/event/60/