I have found one: Sending the Jamaican Bobsled team to the olympics. I highly doubt that this could have been done based on Postgres. Postgres is too boring and stable to attract the necessary attention.
As noted elsewhere, most of the money wasn't transferred via dogecoin. But reasonable financial transaction systems don't attract the advertising attention that this was able to.
Does that make it a good financial system? To the degree that a clown car is a good public transport system.
https://www.npr.org/sections/thetwo-way/2014/01/22/265060754...