postgresql7.1 select r.subscr_id, r.timeout, r.summary_context_id, i.impl_name, case when r.lastbuild = null then 0 else date_part('epoch',r.lastbuild) end as lastbuild from rss_gen_subscrs r, acs_sc_impls i where i.impl_id = r.impl_id and (r.lastbuild is null or now() - r.lastbuild > cast(r.timeout || ' seconds' as interval)) select acs_sc_contract__get_id('RssGenerationSubscriber') select acs_sc_binding__new(:contract_id,:impl_id)