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Apparently the newest version of subway is completely abandoning MongoDB in favor of sqlite. The documentation says nothing about this and provides no warning for existing users. There also doesn't appear to be any migration path.
Making major changes like this requires informing / warning users properly and adequate documentation.
Sorry for the confusion. This ended up being decided in a separate issue( see here: #70 ). I am afraid there isn't any clear migration path.
Understood. The README should still include a section about breaking changes so users of older versions can know about it before upgrading.