Update the SQLAlchemy model to match the schema changes in pull request 249.
Update the SQLAlchemy model to match the schema changes in pull request 249.


Former-commit-id: 0588b845b3033fcaea7985fc5d15c19027a7ec3a
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine