How to check if issue is solved?

I wrote a simple script to get all issues from the pgsql-bugs list that are
reported by the form (basically getting just the issues without any replies
to them) and now while searching through these issues I can't know directly
whether it is solved or not, just a workaround is checking any discussions
in its thread whether there is a patch file attached or not but it is not
accurate as submitting a patch is not related to the issue itself neither
by mentioning the issue id or the issue itself is marked as solved or at
least someone is working on it, so if anyone can help it will be very
appreciated.