Suggestion: Trade sign notifications

[Equinox23]

So I had an Idea after noticing my chests were empty, would it be possible for Zerg to code the trade signs so it notified you when the trade is unable to be completed due to it being out of stock?
other suggestions for trading in general is welcome here.

[Nezark123]

So it would notify you if someone tried to trade with your out of stock chest?

[Romedy]

Perhaps better would be to generate a /mail, sent by the player who tried to trade and failed. I feel like that code would be easier and the added benefit is then the chest/shop owner can contact the buyer directly. Hopefully allows a trade to still occur AND notifies you of the out-of-stock issue.

So, in case that didn't make sense (cause I don't usually)
Romedy goes to Nezark's shop
Romedy tries to trade 1 dia for dirt.
"Trade cannot occur, chest is out of stock."
/mail Nezark123 Romedy has attempted a [insert sign info here] but your chest is out of stock.

Now Nez can restock the chest and contact me about buying his dirt.

[Nezark123]

Makes perfect sense. Your method allows the store owner to know which was out of stock and who wanted it.

Only issue is, what if noobs spam try to buy it, I come on with 30 mail notifications, and since it only shows the last so many, I can't see who tried to buy it and clicked it only once

[Romedy]

There are no noobs on Kreatious...

Okay, good point. I'm not code-savvy enough to make any real recommendations.

Credit/debit card transactions often use time-stamps to avoid double-charging a card accidentally. How viable is it to use this same concept with /mail when the messages are identical?

/mail Nezark123 Romedynoob has attempted a [insert sign info here] but your chest is out of stock.
/mail Nezark123 Romedynoob has attempted a [insert sign info here] but your chest is out of stock.
/mail Nezark123 Romedynoob has attempted a [insert sign info here] but your chest is out of stock.
/mail Nezark123 Romedynoob has attempted a [insert sign info here] but your chest is out of stock.
/mail Nezark123 Romedynoob has attempted a [insert sign info here] but your chest is out of stock.
/mail Nezark123 Romedynoob has attempted a [insert sign info here] but your chest is out of stock.
/mail Nezark123 Romedynoob has attempted a [insert sign info here] but your chest is out of stock.

[Equinox23]

Maybe either a hard coded time delay for each trade, or only 1 notification until the owner interacts with the chest/a successful trade has gone through to prevent mass spam?