Detect incompatible Postgresql version
During initial environment setup I inadvertently pointed Stork to Postgresql 9.5. This apparently caused a SQL syntax error in the migrations code. IIRC it had something to with "AS", syntax error at or near "AS". I did not save the exact message. Upon pointing Stork to Postgresql 11 everything was fine.
It should be possible to detect the Postgresql version in the init db or migration logic and bail if it is too old. Barring that we might consider a more helpful failure message if possible.