Took me a while to figure this out, thought I'd paste it here for others
to use:
create or replace function round_timestamp(timestamp, integer) returns
timestamp as $$
select date_trunc('minute', $1) + cast(round(date_part('seconds',
$1)/$2)*$2 || ' seconds' as interval);
$$ language sql immutable;
If you pass 10 to the second argument, it'll round the timestamp to the
nearest 10 seconds. Pass 5 to round to nearest 5 seconds, etc..
-Andy
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