- api: account-flow stores subject_issuer="dify:account" sentinel
instead of NULL so the rotate-in-place unique index collides as
intended (Postgres treats NULLs as distinct in unique indices).
mint_oauth_token validates prefix-specific issuer rules.
- api: enterprise_only inverts to an allowlist (ACTIVE / EXPIRING) so
any future LicenseStatus value defaults to denial.
- api: consume_on_poll moved to a single Lua script (GET + status-check
+ DEL) so concurrent pollers can't both observe APPROVED.
- web: typed DeviceFlowError + central error-copy mapping; page
surfaces rate_limited / lookup_failed view states; URL params
scrubbed after consumption (RFC 8628 §5.4).
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