Remove utility SQLAlchemy code.
Remove utility SQLAlchemy code.


Former-commit-id: 4f83d4e6d9b22c6e856f9281e06ce5527304f91f [formerly 4f83d4e6d9b22c6e856f9281e06ce5527304f91f [formerly a643bd4e0e8da6a84013293e7bc5ed3032915c59]]
Former-commit-id: 527fda1f2f6e8423d83e8c1d51b9557321289491
Former-commit-id: f9b70219c26332896dca3b6147d74d0a514544d6
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine