[SchizoDuckie]

This is what tooling is for: Define your entities, and generate a wrapper around a datastructure is for, just like you would do with Doctrine and PHP.

Change your entity? Regenerate the wrapper and generate a migration.

Problem still is: Nobody is writing tooling for WebSQL. Everybody just seems to automatically grab NoSQL, throwing away 30 years of built up software developing knowledge, including the golden rules of Database Normalisation: Don't duplicate your data, and compartmentalize.