Seems like some cool, clean code, and I understand without having examined Elixir too much, less than two or three hours of doc scanning. But I guess familiarity with Ruby does make a difference.
Out of curiosity: if you are doing DB migrations, what are you running on Elixir that requires it? You building web apps or just utilities running on top of a DB?
The language source code is incredibly clean and well documented. It's been a joy to work with so far.