Change checkpoint_data and restore_connection_on_error to subtransaction checkpoint_data and restore_connection_on_error used to commit() and rollback() the db connection. This causes additional I/O and load. Changed them to use 'SAVEPOINT name' and 'ROLLBACK TO name' to get a faster method for handling errors within a tranaction. One thing to note is that postgresql (unlike SQL std) doesn't overwrite an older savepoint with he same name. It keeps all savepoints but only rolls back to the newest one with a given name. This could be a resource issue. I left a commented out release statement in case somebody runs into an issue due to too many savepoints. I expect it to slow down the import but....

.. Roundup documentation master file, created by sphinx-quickstart on Tue Jan 20 17:33:20 2009.
   You can adapt this file completely to your liking, but it should at least
   contain the root `toctree` directive.

Sitemap
=======

Contents:

.. toctree::
   :maxdepth: 2

   Home <index>
   Download <https://pypi.org/project/roundup/>
   docs
   Issues <https://issues.roundup-tracker.org>
   contact
   Wiki <https://wiki.roundup-tracker.org>
   code


.. toctree::
   :hidden:

   docs/announcement