Another way to avoid multiline query issues is to use CSV logging, added to PostgreSQL in version 8.3. This logs every statement in a delimited fashion that clearly marks line breaks so that multiline queries can be imported without a problem into tools. You can even import these logs files into the database for analysis; the documentation at http://www.postgresql.org/docs/current/static/runtime-config-logging.html shows a sample table for that purpose in the Using CSV-Format Log Output section.
Note that format of the CSV output fields and therefore the sample table changed in 9.0 (application_name was added) compared with 8.3/8.4. Make sure you're using the right table definition for your version, or COPY will complain that ...
