Sorry about that
For anyone reading this, I ended up creating an issue on Google's bug
tracker. Unfortunately I gave the name of my project so it became
"private" but the answer was that I deleted the service account for the
app. The best way is to undo it
Hi Thomas,
This discussion group is oriented more towards general opinions, trends,
and issues of general nature touching App Engine. For technical
implementation, such as migrating your website, you may be better served in
dedicated forums such as Stack Overflow