ConfigService.get<number>("EMEX_PROXY_PORT_START") returns the raw env
STRING; the port-pick arithmetic then string-concatenated it
(45 + "10001" = "4510001"), producing an out-of-range port that made
undici's `new URL` throw "Invalid URL" at EmexService construction —
crashing the entire API on boot.
A single-port range (823) happened to concat to a still-parseable "0823",
which masked the bug for months. It surfaced the moment the prod
EMEX_PROXY_PORT range was widened (823 -> 10001-10099) to let Q1's
per-request port rotation work: prod crash-looped until the env was
reverted. Coerce to a validated integer port (1-65535) with default
fallback so a real range is safe.
Regression test: constructing EmexService with string port env over a
real range must not throw.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Root-cause analysis live re-decoded all 124 historically-undecoded prod
VINs; 38 already decode now. These 4 fixes target confirmed code bugs
that drop or mask real decodes (see undecoded-vin-rca.md):
Q2 — PL24 circuit breaker now only counts transient transport faults. A
definitive upstream negative (NotFound/BadRequest) no longer trips the
global 30s breaker that was starving PL24 for every subsequent VIN
(the sibling-VIN inconsistency in the report). Live-proven on VR7.
Q3 — previewVin / multi-candidate path no longer returns an empty
success: the pcat/emex candidate branches fill brandName (from catalogId
/ WMI), fixing the 6 "HTTP 200 with null brand+model" cases.
Q1 — EMEX fetch retries transient proxy failures with a FRESH ProxyAgent
per attempt (rotates the DataImpulse port; ~42% blip rate observed),
plus an opt-in direct fallback (EMEX_DIRECT_FALLBACK). HTTP answers are
never retried.
Q4 — VIN resolve cache keys namespaced by DECODE_CHAIN_VERSION and the
negative TTL drops 6h -> 30m, so a decode-chain fix self-heals stale
negatives on deploy instead of masking phantom-undecoded VINs for hours.
The admin cache-buster uses the same key builder.
Tests: 179 passed (+ new Q2/Q3/Q4 specs). typecheck + biome clean.
Deploy note: prod EMEX_PROXY_PORT_START/END are both 823 (single port);
widen to a real range (e.g. 10001-10099) in Coolify so Q1's port
rotation takes full effect.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
