1. A method comprising: receiving a request to store a value in a database, wherein the request specifies a time and a manner in which the value should change; in response to receiving the request, storing, in the database: the value, and first information that indicates the specified time and second information that indicates the specified manner; after an amount of time has passed: based on the first information that indicates the specified time, determining whether a current time satisfies the specified time; in response to determining that the current time satisfies the specified time, changing the value in the specified manner based on the second information that indicates the specified manner; wherein the method is performed by one or more computing devices.