db/models:
db/models:

Cleaned up the `hazard_metadata` logic.


Former-commit-id: 28bf310c807d1f46f089c0fed3c69817c301d30a [formerly a50824a6a49629085071ac62b36dda35a292ef09]
Former-commit-id: 98eb7e03506455b8268f39a678ae8e9041a0cd85
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine