Adversarial line-by-line review of the feature diff turned up:
- /api/database/update/stop was NOT @admin_only while its sibling start_update
was — a non-admin could abort a library scan. Gated.
- /api/metadata-cache/evict was NOT gated while its clear siblings were. Gated.
- validate_credential_payload now treats whitespace-only values as missing, so
a blank-but-spacey secret can't be saved to fail confusingly later.
Tests updated: both endpoints added to the admin-gating matrix; a whitespace-only
validation case added. 42 credential/gating tests pass.
Review also confirmed (no change needed): migration is idempotent + additive +
O(1); encryption round-trips with a non-dict guard; no SQL injection; stale
selections fall back to None safely; no secret ever returned to the browser;
the hybrid-drag index math is correct in both directions; the new resolver is
fully DORMANT (zero runtime callers) so existing client behaviour is untouched;
and @admin_only is a no-op for single-profile installs (default profile = admin).
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