As a developer, I would like email fixtures' date windows to update when I update the code

[kitsuta]

Email fixtures' date windows (e.g., active_before and active_after) are stored in the database, but the system never checks if the fixtures themselves are updated in code. The end result of that is that editing an email fixture's date window in code does nothing. It would be nice if it did things, OR, even better, we had an admin interface that updated it directly (which is why they were moved to the DB in the first place).