While trying to create a "Swimlane Board", I did something wrong (probably didn't hit save). The filter I created for it still exists, but I deleted the project. The filter I created for it can't be deleted, because it is used by a Board, but that Board is not viewable anywhere. I would like to delete all remnants of the project SB.
It must be saved somewhere, but how can I delete it if I can't see it?