After deleting Calendar users, their subscriptions still remain, and the server crashes when accessing deleted calendars

Question

After deleting users from iPlanet Calendar Server(iCS), the users'
subscriptions still remain. Then, if a user tries to unsubscribe
from a deleted calendar, the server sometimes crashes, even though sufficient
disk space and memory are available. When checking the HTTP log, the
log shows that certain calendars don't exist.
The solution to this problem is to back up the ics50gse.db
file to another file with a different
name, or remove the file from the db
directory.
<P>
If you are upgrading your iCS, make sure the GSE database queue is empty
before you perform the upgrade. To check the GSE database queue,
you can use either of the following commands while the server is either
running or stopped:
<P>
csschedule list
<I>OR</I>
csdb -v list
<P>
After issuing the command, if nothing is displayed, the GSE queue is empty, and
you can proceed to step 3 below. However, if the queue does contain
items, use the following steps to flush it:
<P>
<OL>
<LI>Start the server if the server is in a <I>stopped</I> state.
<P>
<LI>Stop only the cshttpd
daemon so that no new requests can
come in.
<P>
Note: It should take only a few minutes for the GSE to handle any requests.
Typically, the GSE queue will be empty.
<P>
<LI>Shut down iCS.
<P>
<LI>Rename the ics50gse.db
file.
<P>
<LI>Restart the server.
</OL>
<P>
If you have already upgraded the server and are experiencing the above
mentioned problems, use the following steps:
<P>
<OL>
<LI>Shut down iCS.
<P>
<LI>Rename the ics50gse.db
file.
<P>
<LI>Restart the server.
</OL>

Answer 1

I forgot to mention that I've cleared out ~/Library/Caches/ for my test user, as well as deleted the iWeb .plist file.