Use Django ORM in the probabilistic risk engine.
Use Django ORM in the probabilistic risk engine.


Former-commit-id: 120d8c4f4b4492415a500276b14ce133eea32833 [formerly 4a142ec959741675cc34871a6fe29a9872eb8985]
Former-commit-id: 551135b4eba2c5b9d2f2ce38c04bb25e148ec07b
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine