Heroku Blob does not exist

If Heroku Postgres doesn't allow blob, what should I use to store binary data? ``` 2012-05-30T05:59:36+00:00 app[web.1]: [debug] c.j.b.StatementHandle - create table image_info ( 2012-05-30T05:59:36+00:00 app[web.1]: id bigint not null, 2012-05-30T05:59:36+00:00 app[web.1]: image_id varchar(255), 2012-05-30T05:59:36+00:00 app[web.1]: subject_id varchar(255), 2012-05-30T05:59:36+00:00 app[web.1]: web_thumbnail blob, 2012-05-30T05:59:36+00:00 app[web.1]: created_date timestamp, 2012-05-30T05:59:36+00:00 app[web.1]: image blob, 2012-05-30T05:59:36+00:00 app[web.1]: thumbnail blob, 2012-05-30T05:59:36+00:00 app[web.1]: constraint pk_image_info primary key (id)) 2012-05-30T05:59:36+00:00 app[web.1]: [debug] c.j.b.PreparedStatementHandle - update play_evolutions set last_problem = 'ERROR: type "blob" does not exist 2012-05-30T05:59:36+00:00 app[web.1]: Position: 176 [ERROR:0, SQLSTATE:42704]' where id = 1 ```