Migrate away from commercial database products to commercial cloud products. Why give away your money when you can give away your data too?
https://babelfishpg.org/blog/releases/2021/10/babelfish-laun...
At the same time, the engineering and domain knowledge expertise required to pull this off is undeniably impressive.
This takes the ORM "compatibility promise" into new territory, maybe even a new stratosphere. Imagine if someone (or company) starts a comparable open-source translation extension layer targeting Postgres as the backend. That would be interesting!
Maybe start with the easier case of SQLite->Pg.
That's what Babelfish is.
https://www.businessinsider.com.au/amazon-uses-seller-data-c...
If it is something else, Please post a link