Thank you for your contribution 
AFAIK, SQLite is relational DBMS which may not be so scalable. The new way of writing the query e.g. using the Sequelize is in fact very much alike the NoSQL such as MongoDB - which is scalable by its nature.
Maybe you can extract all the database logics into a separate module/class which provides the interface for querying database whether it is sqlite or sequelize - in other words, implementation - dependent.
You could also use async/await to replace your Promise syntax. The DB logging can be also handled separatedly.
How do you ensure the upgrade is safe? I would expect the unit tests that give you some confidences.
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RE: Stratos Communities Database Upgrade - Utopian.io