Skeema looks cool, and I've long been a fan of a similar tool that's specific to SQL Server – DB Ghost. I even implemented some pretty handy additional automation on top of it at various companies at which I worked. There were tho, inevitably, a small number of schema changes that needed to be encapsulated as 'migrations', and it could be arbitrarily complex and difficult to write, and test, them in a way that supported automatic rollbacks.