Added unique constraint to the loss_map_node_data table: sites are unique inside a single loss map
Added unique constraint to the loss_map_node_data table: sites are unique inside a single loss map


Former-commit-id: 283e9d9bc14797326e5431161c428ca52b118d59 [formerly f2170bd8c19dddd8d2bab81310908afea54150ce]
Former-commit-id: 5bd7a641076946372d0e816855c38d54d7fb2d6f
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine