Merge branch 'wt/l4-pipeline' into release/v1.30.15

src/app/api/insights/derived/batch/route.ts

@@ -39,6 +39,7 @@ import {
 } from "@/lib/insights/derived";
 import { resolveDeterministicAssessment } from "@/lib/insights/derived/derived-assessment";
 import { resolveServerLocale } from "@/lib/i18n/server-locale";
+import { instructionLocale } from "@/lib/ai/prompts/output-language";
 import { requireModuleEnabled, resolveModuleMap } from "@/lib/modules/gate";
 import { DERIVED_MODULE } from "../route";
 
@@ -177,7 +178,12 @@ export const GET = apiHandler(async (request: NextRequest) => {
     userLocale: user.locale ?? null,
     override: request.nextUrl.searchParams.get("locale"),
   });
-  const assessmentLocale = locale === "de" ? "de" : "en";
+  // This grid only carries the DETERMINISTIC assessment, whose templates ship
+  // de/en bodies — so the same instruction-body rule the prompts use applies:
+  // German for a German reader, English for everyone else. Deliberately NOT
+  // widened to the six; the AI-warm prose (which does carry the full locale)
+  // is served lazily by the per-score route.
+  const assessmentLocale = instructionLocale(locale);
 
   // v1.16.8 — read-through the per-user derived cache with
   // stale-while-revalidate. The cold build below walks the rollup tier
@@ -244,7 +250,7 @@ export const GET = apiHandler(async (request: NextRequest) => {
 async function buildDerivedBatch(input: {
   userId: string;
   items: BatchItem[];
-  assessmentLocale: "de" | "en";
+  assessmentLocale: ReturnType<typeof instructionLocale>;
 }) {
   const { userId, items, assessmentLocale } = input;
 

src/app/api/insights/generate/route.ts

@@ -71,6 +71,7 @@ import { requireAssistantSurface } from "@/lib/feature-flags";
 import { invalidateUserInsights } from "@/lib/cache/invalidate";
 import { annotate } from "@/lib/logging/context";
 import { resolveServerLocale } from "@/lib/i18n/server-locale";
+import { normalizeLocale } from "@/lib/insights/status-shared";
 import { hasUsableStatusProvider } from "@/lib/insights/status-provider";
 import { hashInsightSnapshot } from "@/lib/insights/snapshot-hash";
 import { enqueueForceWarm } from "@/lib/jobs/insight-pregenerate-shared";
@@ -202,7 +203,7 @@ export const GET = apiHandler(async (request: NextRequest) => {
       request,
       userLocale: dbUser?.locale ?? user.locale ?? null,
     });
-    const locale = resolved === "de" ? "de" : "en";
+    const locale = normalizeLocale(resolved);
     void enqueueForceWarm({ userId, locale });
     revalidating = true;
   }
@@ -950,7 +951,7 @@ export const POST = apiHandler((request: NextRequest) =>
     // refresh path until the next nightly warm.
     const refillScopes = await enqueueStatusRefillForUser(
       userId,
-      locale === "de" ? "de" : "en",
+      normalizeLocale(locale),
     );
     annotate({
       action: { name: "insights.generate.cards_refill" },

src/app/api/insights/pregenerate/route.ts

@@ -30,6 +30,7 @@ import { requireModuleEnabled } from "@/lib/modules/gate";
 import { checkRateLimit } from "@/lib/rate-limit";
 import { annotate } from "@/lib/logging/context";
 import { resolveServerLocale } from "@/lib/i18n/server-locale";
+import { normalizeLocale } from "@/lib/insights/status-shared";
 import { enqueueForceWarm } from "@/lib/jobs/insight-pregenerate-shared";
 
 export const dynamic = "force-dynamic";
@@ -59,7 +60,10 @@ export const POST = apiHandler(async (request: NextRequest) => {
     request,
     userLocale: user.locale ?? null,
   });
-  const locale = resolved === "en" ? "en" : "de";
+  // Carry the reader's ACTUAL locale into the warm payload. The former
+  // `resolved === "en" ? "en" : "de"` sent every fr/es/it/pl account down the
+  // German warm, so the whole warmed cache family was in the wrong language.
+  const locale = normalizeLocale(resolved);
 
   await enqueueForceWarm({ userId, locale });