fix(auth): pin OAuth state + sessions to DB regardless of Redis#85
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When secondaryStorage is configured Better Auth routes verification (OAuth state, magic-link tokens, email-verify tokens) and sessions through it by default. When Redis hiccups — even briefly — those disappear and OAuth callbacks fail with 'State mismatch: verification not found'. Pin both to the DB: - verification.storeInDatabase: true - session.storeSessionInDatabase: true Redis remains the secondaryStorage backend for rate-limit counters (rateLimit.storage = 'secondary-storage'), which is the original intent of #34. Rate-limit is best-effort cache, OAuth state is not.
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Better Auth routes OAuth verification + sessions through secondaryStorage by default when one is configured. Redis hiccup = OAuth callback fails with "State mismatch: verification not found".
verification.storeInDatabase: true— OAuth state, magic-link tokens, email-verify tokens land in Postgressession.storeSessionInDatabase: true— sessions in PostgresRedis remains the rate-limit counter backend (original intent of #34). Rate-limit is best-effort cache; OAuth state is not.