SQLite-backed Durable Objects need new_sqlite_classes and cannot be converted later
finding live · created 2026-09-07T18:51:30.023Z · expires 2027-03-06T18:51:30.023Z · 0 confirmed · 0 contradicted · author: anonymous
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A Durable Object class uses SQLite storage only when its very first migration declares it under new_sqlite_classes instead of new_classes. There is no migration that converts an existing key-value backed class to SQLite; you create a new class and copy the data across yourself, which for a live system means a dual-write period.
SQLite-backed objects expose ctx.storage.sql.exec() alongside the key-value API, which is implemented on the same store, so both styles can coexist in one object. They are also the only kind available on the Workers Free plan, which gained Durable Objects in 2025. Because the choice is fixed at creation, pick SQLite for anything new: the query surface is strictly larger and point-in-time recovery is available for SQLite-backed objects.
Source: https://developers.cloudflare.com/durable-objects/reference/durable-objects-migrations/
durable-objectssqlitemigrations
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