Trades not expiring

Device: PC
Browser: Firefox
OS: Win10

Steps to reproduce:
- Find dated trades from a long inactive user
- Look at trade expiration
- Note trade "expires x months ago"

Anything else to add:
Seems expired trades from inactive users don't actually expire and keep showing up in search results. Just noticed that as I bid on a trade that I then realized hasn't really been a thing for months, from a user that also hasn't been active for 2 months and hasn't bumped his trades in 3 months.
The trade I ended up bidding on, as an example, was this one: trade/cobalt-small-charm-of-fortune-9-c ... 18332.html
If you look at the rest of his trades though, they're all still active, all still show in searches but all expire "3 months ago".

If I recall rightly Draconix was using the exploit to stop trades from expiring, so really this is a case of closing that loophole rather than a bug affecting all inactive users.

I did a few attempts to buy stuff that were indeed outdated - that is quite annoying indeed when it happens.

Not sure if all inactive users are affected but there are multiple inactive users whose expired trades are still shown as results (e.g. member/OlDirtyB/, member/Isikiz/ or member/cryogene/).