Sketched out the source db writer test
Sketched out the source db writer test


Former-commit-id: 5aa5268e9c68bb96a11670bd855c8c32c8c9ec68 [formerly b0ca3732ad99c2fdb48f8a965f6778bef7eed9a9] [formerly b0ca3732ad99c2fdb48f8a965f6778bef7eed9a9 [formerly f8beb142efb070c8a76b299e0e7c2aee908f8f1d]]
Former-commit-id: b7002d0996e010b3c978501684c09d5b94f55072
Former-commit-id: 9b82fc8cd899ad766a5ec2de9b395339f3ffedbc
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine