Need to add a field to track when the Flag was last edited.

[hunter-read-va]

We need to add a field to the Flag object that tracks when the most recent change to the enabled status was made. This should be null if it has only be created, but updated whenever the enabled field value is change so we can track when the feature was last enabled/disabled.

This information needs to be updated both backend and returned in the Response to the frontend. The frontend next client should display the new field.