Call will return the instant a change occurs in the activerecord item or timeout after a certain length of time (20 seconds?).
Bids will be submitted in a transaction which checks if the latest bid is REALLY the latest bid, and if so to then update with the new bid details.
UI needs to avoid letting someone go to click on the bid button only to have it change the instant they are about to bid. Maybe an animation showing it changing that delays for a second or two.
I want people to be able to bid online. Which also means: