A method and system for reviewing edits and editing content items are provided. An edit to a first version of a first content item is received. The first version of the first content is part of the active content delivery campaign and has been delivered over a computer network to a first plurality of computing devices. The edit is stored in a first storage that is separate from a second storage. An event indicating the edit is inserted into an event processing system. A result approving the edit is received from the event processing system. In response to receiving the result approving the edit, a second version is caused to be stored in the second storage. The second version reflecting the edit is caused to be delivered over the computer network.