Any idea what replaced the Active field in the forum table?

[sel100]

SELECT * FROM forum WHERE displayorder<>0 AND active = 1 ORDER BY
parentid,displayorder

Here is the sql query which pulls back 22 threads from our boards (running 2.3.0). It pulls back 24 threads if the "AND active=1" is removed. Not sure what warrants the active flag being set to 1 but the difference is when 24 threads are returned it contains threads which haven't had posts on then for a while. So what we want to return is a list of threads which have had posts in the last few hours. Many thanks.