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better-auth >=1.7 (1.7.1 measured on web1; our ^1.5.5 range resolves it on fresh installs) requires an issuer on every account row: sign-up writes the synthetic 'local:credential' and sign-in filters accounts on (providerId='credential' AND issuer=that value). The db schema had no issuer column, so every fresh next install 500s at signup and 401s every sign-in while admin-token auth kept working. - schema: accounts.issuer text, nullable — the 1.5.x line our lockfile resolves to does not know the field (1.5 ignores, 1.7 populates; one schema serves both) - migration 0017 (drizzle-kit generated snapshot/ALTER, hand backfill folded in): ADD COLUMN issuer text; UPDATE credential rows with NULL issuer to 'local:credential'. OAuth/sso rows deliberately left NULL — better-auth owns their issuer semantics going forward - tests: greenfield column assertion (nullable, text); UPGRADE-PATH arm replays 0000..0016, seeds one credential + one oauth row without issuer, applies 0017, and discriminates: credential backfilled, oauth stays NULL - mutants killed: backfill dropped -> upgrade arm fails; backfill-all -> oauth assertion fails Found by T63 on web1 greenfield; verified there as a dist-patch (prior art). Root cause, error strings, and the post-fix 200 measured by fred; independently re-derived here against @better-auth/[email protected]'s schema exports (issuer exists ONLY on account — user/session/verifications carry no issuer field).