A utility (electricity) company collects the usage of its 5 million customers for the lifetime of their subscription. The company would like to provide a service to its customers where they are able to monitor their hourly, daily, weekly, and monthly usage.
You are tasked to design a system that allows the company to collect and store the data, and present that data to their customers on an ad hoc basis. (Please keep in mind that in this scenario there is no requirement that this data source will be used to make any determinations of repair, maintenance, or electricity outages).