Ability to customize ABU's StB calculation period

It has been pointed out that with more and more merchants opting for day parting, there is a minor flaw in our Bid management logic which we should be fixing. Here are more details on the issue itself and possible solutions.

Issue: Let’s consider an example where for an account, the merchant decides to implement day parting for campaigns meaning the campaigns won’t serve any Ads, bringing down the spend on these days to 0. In such a scenario, since we do not have day parting integrated into our system, our ABU (AdMax budget updater) will look at data from Saturday & Sunday and treat it as no spend despite setting budget for those days. With 0 StB (spend to budget), ABU will do what it is supposed to do, which is it would raise the bids to achieve spend. This when carries over a period of few weeks, our bids are set higher than what they should ideally be.

Solution 1 (Ideal Solution): The ideal solution to fix this issue would be do implement day parting in our platform. We build the day parting functionality in our UI which is then sent to Search Engine. On bidding end, our ABU will need to be modified to identify the day parting flag for the campaign for a given day and hence will not increase the bids. The budget and carryover calculation will work as usual.

Solution 2 (Workaround Solution): Another indirect way to handle this issue would be to not just consider 1 day (day-1) to calculate the StB. Basically StB is what ABU uses to take decision on whether the bids need to be increased/decreased/no-action. Typically our ABU maintains the bids at same level when the StB is between 90% - 100%. Any dip or increase in StB will push ABU to increase or decrease bids. It is important to note that the limits of 90-100 is configurable on our end. So basically, the proposal is to look at 7 day rolling StB instead of just 1 day which would give our ABU a better StB and hence would help in taking decision on Bids. Again, since we are touching with ABU logic here, it might be good to take an informed decision on this by looking at historical data and identifying the impact of 7 day rolling StB calculation.

We will be implementing Solution 2 as a part of this task.

The StB calculation period should be a configurable property which can be set for a reseller/merchant.