That’s plausible for sure. The company I worked for until recently maintains a core data store in Mongo, but mirrors the content into a Postgres database for u

That’s plausible for sure. The company I worked for until recently maintains a core data store in Mongo, but mirrors the content into a Postgres database for use by other, newer applications (which don’t modify the data). We built a tool which streams the MongoDB Oplog into tables containing a JSONB column for the document - https://github.com/mudge/oplogjam https://github.com/mudge/oplogjam - and it has been pretty good to work with. Sefilitely am approach than can work well in my experience, though!