Could this be address with ConnectionHandler <http://api.rubyonrails.org/classes/ActiveRecord/ConnectionAdapters/ConnectionHandler.html>? I imagine models in each engine could call with "establish_connection :my_engine" (or inherit from a base class a'la ApplicationRecord) and then database.yml could provide per-engine connection settings. If an engine needs to use the "default" database then it'd just inherit the settings for production.
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