This library provides a "PostgreSQL" driver for the "hasql" library.
It supports all Postgres versions starting from 8.3
and is tested against 8.3, 9.3 and 9.4
integer_datetimes setting off and on.
According to the included benchmarks, it performs up to 2x faster than "postgresql-simple" and up to 7x faster than "HDBC". You can read up a post with analysis of those benchmarks.