Ellery is helping Megan with digging deep into data around banner performance and donations. He'd like to have more information about the history of banners that a donor has seen in order to develop campaigns moving forward.
We're still fleshing out what this should look like exactly.
Wiki page with guiding information: https://www.mediawiki.org/wiki/Extension:CentralNotice/Notes/Campaign-associated_mixins_and_banner_history