feat: support Better Auth 1.7 with atomic storage - #64
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Follow-up to #62.
Better Auth 1.7 requires atomic
incrementandgetAndDelete, which KV cannot provide. This adds an optional Durable Object adapter without silently moving existing KV users onto a paid backend.The Hono example uses Durable Objects for secondary storage. OpenNext keeps KV for session caching, stores verification data in D1, and uses a Durable Object only for rate limiting. That split is intentional: each atomic operation routed through a Durable Object adds a request.
This also tightens the upgrade path. The CLI creates a fresh lockfile with the selected package manager, remote migrations require a separate reviewed command, and CI regenerates the Drizzle SQL, snapshot, and journal instead of trusting hand-edited migration files.
One sharp edge remains upstream: the generated 1.7 migration adds
accounts.issuerasNOT NULL. Anyone upgrading a populated 1.6 database still needs to back it up and rehearse that migration first.