A decode that failed from a transient proxy/network blip (PartsCatalogs
DataImpulse ConnectTimeout, EMEX timeout, PL24 transport error) was written to
the 6h negative cache identically to a genuine "brand not supported" miss. A
user who hit a blip then got "Şase tanınamadı" for 6h with no way to retry out —
and prod analytics showed this hitting SUPPORTED brands (Fiat/Toyota/Hyundai
decode fine once the proxy responds).
Thread a `transient` outcome flag through resolveVin -> doResolveVin:
- PartsCatalogs.decodeVin sets it when it swallows a transport error (vs a clean
"no cars" miss), via a new optional outcome param.
- EMEX surfaces it via its existing {type:"error"} result.
- PL24 sets it on transport/timeout errors in the fallback catch.
resolveVin then skips the negative cache when transient=true; genuine misses
still cache for 6h. Phase 1 of 4 on decode reliability.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Semih Yesilyurt
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