Rotfang, the random data generator

The other day I gave a lightning talk at pgCon about a Foreign Data Wrapper called Rotfang, which is for generating arbitrary amounts of random data. This is intended for generating test cases. The software supports a small number of data types natively, but also allows you to use user-supplied functions to generate data. It's available on bitbucket. A short example:

CREATE EXTENSION rotfang_fdw;

CREATE FUNCTION random_tstz (typmod int)
RETURNS timestamptz
LANGUAGE SQL as
$$
    SELECT now() - (random() * 20.0) * interval '1 year'
$$;

CREATE FOREIGN TABLE rand2 (b boolean, ts timestamptz)
SERVER rotfang
OPTIONS (maxrows '10', func_ts 'random_tstz');

SELECT * FROM rand2;