CartoDB/cartodb — pull request #1596 by juanignaciosl (2014-12-24 14:47:05+00:00)
Title: Remove transaction, it fails and it's no longer useful

I had introduced the transaction in order to increase statement_timeout in a PGBouncer-compatible fashion. Now it's no longer necessary, since ALTER TABLE is immediate, and makes no sense using a batched query that takes longer than the transaction timeout. @Kartones CR this, please.