web: adopt Cache Components, Partial Prefetching and ensureStatic

web/next.config.mjs

@@ -22,6 +22,13 @@ function remotePatterns() {
 
 const nextConfig = {
   output: "standalone",
+  cacheComponents: true,
+  partialPrefetching: true,
+  // Next renders every page per request, uncached, for the crawlers and
+  // link-preview bots on its "HTML-limited" list, so their metadata is never
+  // streamed after <head>. No page here streams metadata (it all comes from
+  // cached CMS data), so no bot needs that; this pattern matches none
+  htmlLimitedBots: /(?!)/,
   images: {
     remotePatterns: remotePatterns(),
     formats: ["image/avif", "image/webp"],

web/src/app/[...url]/page.tsx

@@ -1,5 +1,5 @@
 import { graphql } from "@/gql";
-import { getClient } from "@/app/client";
+import { cmsQuery } from "@/app/client";
 import { Metadata, ResolvingMetadata } from "next";
 import { notFound } from "next/navigation";
 import {
@@ -8,6 +8,13 @@ import {
 } from "@/components/general/GenericPageView";
 import { getSeoMetadata } from "@/lib/seo";
 
+// Fail the build if this route stops being fully prerendered
+export const ensureStatic = "navigation";
+
+// Navigations wait for the page instead of showing a loading shell first:
+// the response has to be able to turn into a real 404 for an unknown path
+export const instant = false;
+
 function getWagtailUrlPath(url: string[]): string {
   // for the page /foo/bar we need to look for `/home/foo/bar/`
   return `/home/${url.join("/")}/`;
@@ -22,10 +29,7 @@ export async function generateStaticParams() {
       }
     }
   `);
-  const { data, error } = await getClient().query(allGenericSlugsQuery, {});
-  if (error) {
-    throw new Error(error.message);
-  }
+  const data = await cmsQuery(allGenericSlugsQuery, {});
   if (!data?.pages) {
     throw new Error("Failed to generate static params for generic subpages");
   }

web/src/app/aktuelt/[slug]/page.tsx

@@ -5,10 +5,17 @@ import {
   loadNewsPageProps,
 } from "@/components/news/NewsPageView";
 import { getSeoMetadata } from "@/lib/seo";
+import { latestSlugParams } from "@/lib/staticParams";
+
+// Fail the build if this route stops being fully prerendered
+export const ensureStatic = "navigation";
+
+// Navigations wait for the page instead of showing a loading shell first:
+// the response has to be able to turn into a real 404 for an unknown path
+export const instant = false;
 
 export async function generateStaticParams() {
-  // Prerender nothing at build time; render and cache on first request
-  return [];
+  return latestSlugParams("news.NewsPage");
 }
 
 type Params = Promise<{ slug: string }>;

web/src/app/aktuelt/page.tsx

@@ -1,5 +1,5 @@
 import { Metadata, ResolvingMetadata } from "next";
-import { getClient } from "@/app/client";
+import { cmsQuery } from "@/app/client";
 import {
   NewsIndexView,
   loadNewsIndexProps,
@@ -8,12 +8,14 @@ import { NewsIndexFragment } from "@/gql/graphql";
 import { newsIndexMetadataQuery } from "@/lib/news";
 import { getSeoMetadata } from "@/lib/seo";
 
+// Fail the build if this route stops being fully prerendered
+export const ensureStatic = "navigation";
+
 export async function generateMetadata(
   _: unknown,
   parent: ResolvingMetadata
 ): Promise<Metadata | null> {
-  const { data, error } = await getClient().query(newsIndexMetadataQuery, {});
-  if (error) throw new Error(error.message);
+  const data = await cmsQuery(newsIndexMetadataQuery, {});
   if (!data?.index) return null;
   return getSeoMetadata(data.index as NewsIndexFragment, parent);
 }

web/src/app/api/revalidate/route.test.ts

@@ -1,21 +1,23 @@
-import type { NextRequest } from "next/server";
+import { NextRequest } from "next/server";
 import { afterEach, describe, expect, it, vi } from "vitest";
 
 vi.mock("next/cache", () => ({ revalidateTag: vi.fn() }));
 
 import { revalidateTag } from "next/cache";
-import { CMS_CACHE_TAG } from "@/lib/revalidation";
+import { setInternalRevalidateSecret } from "@/lib/internalRevalidate";
+import { CMS_CACHE_TAG, TODAY_CACHE_TAG } from "@/lib/revalidation";
 import { POST } from "./route.ts";
 
-const request = (headers: Record<string, string> = {}) =>
-  new Request("http://localhost/api/revalidate", {
+const request = (headers: Record<string, string> = {}, query = "") =>
+  new NextRequest(`http://localhost/api/revalidate${query}`, {
     method: "POST",
     headers,
-  }) as unknown as NextRequest;
+  });
 
 afterEach(() => {
   vi.unstubAllEnvs();
   vi.clearAllMocks();
+  setInternalRevalidateSecret("");
 });
 
 describe("POST /api/revalidate", () => {
@@ -47,4 +49,119 @@ describe("POST /api/revalidate", () => {
     expect(await res.json()).toEqual({ revalidated: true, tag: CMS_CACHE_TAG });
     expect(revalidateTag).toHaveBeenCalledWith(CMS_CACHE_TAG, { expire: 0 });
   });
+
+  it("purges only the today tag when asked to", async () => {
+    vi.stubEnv("REVALIDATE_WEBHOOK_SECRET", "hemmelig");
+
+    const res = await POST(
+      request({ "x-revalidate-secret": "hemmelig" }, "?tag=today")
+    );
+
+    expect(res.status).toBe(200);
+    expect(revalidateTag).toHaveBeenCalledTimes(1);
+    expect(revalidateTag).toHaveBeenCalledWith(TODAY_CACHE_TAG, { expire: 0 });
+  });
+
+  it("rejects tags it doesn't know", async () => {
+    vi.stubEnv("REVALIDATE_WEBHOOK_SECRET", "hemmelig");
+
+    const res = await POST(
+      request({ "x-revalidate-secret": "hemmelig" }, "?tag=noe-annet")
+    );
+
+    expect(res.status).toBe(400);
+    expect(revalidateTag).not.toHaveBeenCalled();
+  });
+
+  describe("follow-up purge", () => {
+    const fetchMock = vi.fn();
+    const followUpCalls = () => fetchMock.mock.calls.map(([url]) => String(url));
+
+    function setUp() {
+      vi.useFakeTimers();
+      vi.stubGlobal("fetch", fetchMock);
+      fetchMock.mockResolvedValue({ ok: true, status: 200 });
+      vi.stubEnv("REVALIDATE_WEBHOOK_SECRET", "hemmelig");
+      vi.stubEnv("PORT", "4321");
+      vi.stubEnv("HOSTNAME", "0.0.0.0");
+      setInternalRevalidateSecret("intern");
+    }
+
+    afterEach(() => {
+      vi.useRealTimers();
+      vi.unstubAllGlobals();
+      fetchMock.mockReset();
+    });
+
+    it("purges again a few seconds after a webhook, as the server itself", async () => {
+      setUp();
+
+      await POST(request({ "x-revalidate-secret": "hemmelig" }));
+      await vi.advanceTimersByTimeAsync(4_000);
+      expect(fetchMock).not.toHaveBeenCalled();
+
+      await vi.advanceTimersByTimeAsync(1_500);
+      expect(followUpCalls()).toEqual([
+        "http://127.0.0.1:4321/api/revalidate?tag=cms",
+      ]);
+      expect(fetchMock.mock.calls[0][1].headers["x-revalidate-secret"]).toBe(
+        "intern"
+      );
+    });
+
+    it("sends one follow-up after a burst of webhooks", async () => {
+      setUp();
+
+      for (let i = 0; i < 3; i++) {
+        await POST(request({ "x-revalidate-secret": "hemmelig" }));
+        await vi.advanceTimersByTimeAsync(2_000);
+      }
+      await vi.advanceTimersByTimeAsync(10_000);
+
+      expect(followUpCalls()).toHaveLength(1);
+    });
+
+    it("is not scheduled by the server's own purges", async () => {
+      setUp();
+
+      await POST(request({ "x-revalidate-secret": "intern" }, "?tag=today"));
+      await vi.advanceTimersByTimeAsync(60_000);
+
+      expect(fetchMock).not.toHaveBeenCalled();
+    });
+
+    it("is skipped where the server can't call itself", async () => {
+      setUp();
+      setInternalRevalidateSecret("");
+
+      await POST(request({ "x-revalidate-secret": "hemmelig" }));
+      await vi.advanceTimersByTimeAsync(60_000);
+
+      expect(fetchMock).not.toHaveBeenCalled();
+    });
+  });
+
+  describe("the server's own purges", () => {
+    it("are accepted without a configured webhook secret", async () => {
+      vi.stubEnv("REVALIDATE_WEBHOOK_SECRET", undefined);
+      setInternalRevalidateSecret("intern");
+
+      const res = await POST(
+        request({ "x-revalidate-secret": "intern" }, "?tag=today")
+      );
+
+      expect(res.status).toBe(200);
+      expect(revalidateTag).toHaveBeenCalledWith(TODAY_CACHE_TAG, { expire: 0 });
+    });
+
+    it("don't open the endpoint to an empty secret", async () => {
+      vi.stubEnv("REVALIDATE_WEBHOOK_SECRET", "hemmelig");
+
+      expect((await POST(request())).status).toBe(401);
+      expect((await POST(request({ "x-revalidate-secret": "" }))).status).toBe(
+        401
+      );
+      expect(revalidateTag).not.toHaveBeenCalled();
+    });
+  });
 });

web/src/app/api/revalidate/route.ts

@@ -2,7 +2,11 @@ import { timingSafeEqual } from "node:crypto";
 import { revalidateTag } from "next/cache";
 import { NextRequest, NextResponse } from "next/server";
 
-import { CMS_CACHE_TAG } from "@/lib/revalidation";
+import {
+  internalRevalidateSecret,
+  purgeOwnCache,
+} from "@/lib/internalRevalidate";
+import { CACHE_TAGS, CMS_CACHE_TAG, type CacheTag } from "@/lib/revalidation";
 
 function secretMatches(provided: string, expected: string): boolean {
   const a = Buffer.from(provided);
@@ -10,19 +14,55 @@ function secretMatches(provided: string, expected: string): boolean {
   return a.length === b.length && timingSafeEqual(a, b);
 }
 
+const FOLLOW_UP_DELAY_MS = 5_000;
+const followUps = new Map<CacheTag, ReturnType<typeof setTimeout>>();
+
+// Next stamps a cached page when its render finishes. A page that was being
+// rendered while a purge came in (two saves in quick succession) therefore
+// looks newer than the purge and would keep the older content. A second
+// purge shortly after the last one in a burst catches those pages
+function scheduleFollowUpPurge(tag: CacheTag) {
+  clearTimeout(followUps.get(tag));
+  const timer = setTimeout(async () => {
+    followUps.delete(tag);
+    const error = await purgeOwnCache(tag);
+    if (error) console.error(`Follow-up purge of "${tag}" failed: ${error}`);
+  }, FOLLOW_UP_DELAY_MS);
+  timer.unref();
+  followUps.set(tag, timer);
+}
+
+// POST /api/revalidate purges the cms tag (the CMS webhook);
+// POST /api/revalidate?tag=today purges only what depends on the day
 export async function POST(req: NextRequest) {
-  const secret = process.env.REVALIDATE_WEBHOOK_SECRET;
-  if (!secret) {
-    return NextResponse.json(
-      { error: "revalidation is not configured" },
-      { status: 503 }
-    );
-  }
   const provided = req.headers.get("x-revalidate-secret") ?? "";
-  if (!secretMatches(provided, secret)) {
-    return NextResponse.json({ error: "invalid secret" }, { status: 401 });
+  // the server's own startup and midnight purges (instrumentation.ts)
+  const internal = internalRevalidateSecret();
+  const isInternal = internal !== undefined && secretMatches(provided, internal);
+
+  if (!isInternal) {
+    const secret = process.env.REVALIDATE_WEBHOOK_SECRET;
+    if (!secret) {
+      return NextResponse.json(
+        { error: "revalidation is not configured" },
+        { status: 503 }
+      );
+    }
+    if (!secretMatches(provided, secret)) {
+      return NextResponse.json({ error: "invalid secret" }, { status: 401 });
+    }
+  }
+
+  const tag = req.nextUrl.searchParams.get("tag") ?? CMS_CACHE_TAG;
+  if (!CACHE_TAGS.includes(tag as CacheTag)) {
+    return NextResponse.json({ error: "unknown tag" }, { status: 400 });
   }
   // expire: 0 purges immediately; the next request renders fresh
-  revalidateTag(CMS_CACHE_TAG, { expire: 0 });
-  return NextResponse.json({ revalidated: true, tag: CMS_CACHE_TAG });
+  revalidateTag(tag, { expire: 0 });
+  // not after the server's own purges, which would loop; and only where the
+  // server can call itself (not in dev)
+  if (!isInternal && internal !== undefined) {
+    scheduleFollowUpPurge(tag as CacheTag);
+  }
+  return NextResponse.json({ revalidated: true, tag });
 }

web/src/app/api/v1/events/route.test.ts

@@ -2,9 +2,19 @@ import { NextRequest } from "next/server";
 import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
 
 const queryMock = vi.fn();
+// mirrors cmsQueryForToday: returns the data, throws on a GraphQL error
 vi.mock("@/app/client", () => ({
-  getClient: () => ({ query: queryMock }),
+  cmsQueryForToday: async (...args: unknown[]) => {
+    const { data, error } = await queryMock(...args);
+    if (error) throw new Error(error.message);
+    return data;
+  },
 }));
+// the real one is a server-only cached function; read the (fake) clock instead
+vi.mock("@/lib/today", async () => {
+  const { osloDay, startOfOsloDay } = await import("@/lib/date");
+  return { getToday: async () => startOfOsloDay(osloDay()) };
+});
 
 import { GET } from "./route.ts";
 

web/src/app/api/v1/events/route.ts

@@ -1,6 +1,6 @@
 import { NextRequest, NextResponse } from "next/server";
-import { getClient } from "@/app/client";
-import { cachedUntilOsloMidnight } from "@/lib/revalidation";
+import { cmsQueryForToday } from "@/app/client";
+import { getToday } from "@/lib/today";
 import {
   eventsOverviewQuery,
   getSingularEvents,
@@ -46,14 +46,7 @@ export async function GET(req: NextRequest) {
     );
   }
 
-  const { data, error } = await getClient().query(
-    eventsOverviewQuery,
-    {},
-    cachedUntilOsloMidnight()
-  );
-  if (error) {
-    throw new Error(error.message);
-  }
+  const data = await cmsQueryForToday(eventsOverviewQuery, {});
   if (
     !data?.index ||
     !data?.events?.futureEvents ||
@@ -64,6 +57,7 @@ export async function GET(req: NextRequest) {
     throw new Error("Failed to fetch events");
   }
 
+  const today = await getToday();
   const futureEvents = (data?.events?.futureEvents ?? []) as EventOverviewItemFragment[];
   const eventCategories = (data?.eventCategories ?? []) as EventCategory[];
   const eventOrganizers = (data?.eventOrganizers ?? []) as EventOrganizer[];
@@ -71,7 +65,7 @@ export async function GET(req: NextRequest) {
 
   const keepKeys = ["id", "slug", "title", "subtitle", "occurrence"];
   const compactEvents = futureEvents.map((event) => {
-    const futureOccurrences = getFutureOccurrences(event);
+    const futureOccurrences = getFutureOccurrences(event, today);
     const nextOccurrence = futureOccurrences.length
       ? futureOccurrences[0]
       : null;

web/src/app/arrangementer/[slug]/page.tsx

@@ -5,10 +5,17 @@ import {
   loadEventPageProps,
 } from "@/components/events/EventPageView";
 import { getSeoMetadata } from "@/lib/seo";
+import { latestSlugParams } from "@/lib/staticParams";
+
+// Fail the build if this route stops being fully prerendered
+export const ensureStatic = "navigation";
+
+// Navigations wait for the page instead of showing a loading shell first:
+// the response has to be able to turn into a real 404 for an unknown path
+export const instant = false;
 
 export async function generateStaticParams() {
-  // Prerender nothing at build time; render and cache on first request
-  return [];
+  return latestSlugParams("events.EventPage");
 }
 
 type Params = Promise<{ slug: string }>;

web/src/app/arrangementer/page.tsx

@@ -1,5 +1,5 @@
 import { Metadata, ResolvingMetadata } from "next";
-import { getClient } from "@/app/client";
+import { cmsQuery } from "@/app/client";
 import {
   EventIndexView,
   loadEventIndexProps,
@@ -8,22 +8,20 @@ import { EventIndexFragment } from "@/gql/graphql";
 import { eventIndexMetadataQuery } from "@/lib/event";
 import { getSeoMetadata } from "@/lib/seo";
 
+// The event list renders per request (it depends on the URL's filters), so
+// only the shell around it has to stay prerendered
+export const ensureStatic = "shell";
+
 export async function generateMetadata(
   _: unknown,
   parent: ResolvingMetadata
 ): Promise<Metadata | null> {
-  const { data, error } = await getClient().query(eventIndexMetadataQuery, {});
-  if (error) throw new Error(error.message);
+  const data = await cmsQuery(eventIndexMetadataQuery, {});
   if (!data?.index) return null;
   return getSeoMetadata(data.index as EventIndexFragment, parent);
 }
 
-export default async function Page({
-  searchParams,
-}: {
-  searchParams?: Promise<Record<string, string | string[] | undefined>>;
-}) {
-  await searchParams;
+export default async function Page() {
   const props = await loadEventIndexProps();
   return <EventIndexView {...props} />;
 }

web/src/app/client.ts

@@ -1,9 +1,16 @@
 import "server-only";
 
-import { cacheExchange, createClient, fetchExchange } from "@urql/core";
+import {
+  type AnyVariables,
+  type TypedDocumentNode,
+  cacheExchange,
+  createClient,
+  fetchExchange,
+  stringifyDocument,
+} from "@urql/core";
 import { registerUrql } from "@urql/next/rsc";
 
-import { CMS_CACHE_TAG } from "@/lib/revalidation";
+import { cmsCache, cmsCacheForToday } from "@/lib/cmsCache";
 
 const wagtailBaseUrl = process.env.WAGTAIL_BASE_URL;
 if (!wagtailBaseUrl) {
@@ -15,10 +22,50 @@ const makeClient = () => {
   return createClient({
     url: graphqlEndpoint,
     exchanges: [cacheExchange, fetchExchange],
-    // Cache all queries in the Data Cache until revalidateTag(CMS_CACHE_TAG);
-    // override per operation with the contexts in @/lib/revalidation
-    fetchOptions: { cache: "force-cache", next: { tags: [CMS_CACHE_TAG] } },
   });
 };
 
+// Uncached. Only for per-user (search) and token-scoped (preview) queries,
+// together with the `uncached` context; everything else goes through cmsQuery
 export const { getClient } = registerUrql(makeClient);
+
+// Throws on GraphQL and network errors, which keeps them out of the cache
+async function runQuery(query: string, variables: AnyVariables) {
+  const { data, error } = await getClient().query(query, variables);
+  if (error) throw new Error(error.message);
+  return data;
+}
+
+// The cached functions take the query as text: their arguments are the cache
+// key, and urql adds bookkeeping properties to document objects it has seen
+async function cachedQuery(query: string, variables: AnyVariables) {
+  "use cache";
+  cmsCache();
+  return runQuery(query, variables);
+}
+
+async function cachedQueryForToday(query: string, variables: AnyVariables) {
+  "use cache";
+  cmsCacheForToday();
+  return runQuery(query, variables);
+}
+
+// Every cacheable CMS read goes through one of the two functions below, so
+// all of them carry the tag the CMS webhook purges
+
+// Cached until the content is edited in the CMS
+export function cmsQuery<Data, Variables extends AnyVariables>(
+  document: TypedDocumentNode<Data, Variables>,
+  variables: Variables
+): Promise<Data | undefined> {
+  return cachedQuery(stringifyDocument(document), variables);
+}
+
+// For queries where the CMS decides by today's date what to return
+// (futureEvents): also purged at Oslo midnight
+export function cmsQueryForToday<Data, Variables extends AnyVariables>(
+  document: TypedDocumentNode<Data, Variables>,
+  variables: Variables
+): Promise<Data | undefined> {
+  return cachedQueryForToday(stringifyDocument(document), variables);
+}

web/src/app/foreninger/[slug]/page.tsx

@@ -1,6 +1,6 @@
 import { Metadata, ResolvingMetadata } from "next";
 import { notFound } from "next/navigation";
-import { getClient } from "@/app/client";
+import { cmsQuery } from "@/app/client";
 import {
   AssociationPageView,
   loadAssociationPageProps,
@@ -8,6 +8,13 @@ import {
 import { graphql } from "@/gql";
 import { getSeoMetadata } from "@/lib/seo";
 
+// Fail the build if this route stops being fully prerendered
+export const ensureStatic = "navigation";
+
+// Navigations wait for the page instead of showing a loading shell first:
+// the response has to be able to turn into a real 404 for an unknown path
+export const instant = false;
+
 type Params = Promise<{ slug: string }>;
 
 export async function generateMetadata(
@@ -29,11 +36,7 @@ export async function generateStaticParams() {
       }
     }
   `);
-  const { data, error } = await getClient().query(allAssociationSlugsQuery, {});
-
-  if (error) {
-    throw new Error(error.message);
-  }
+  const data = await cmsQuery(allAssociationSlugsQuery, {});
   if (!data?.pages) {
     throw new Error(
       "Failed to generate static params for subpages of /foreninger"

web/src/app/foreninger/page.tsx

@@ -5,6 +5,9 @@ import {
 } from "@/components/associations/AssociationIndexView";
 import { getSeoMetadata } from "@/lib/seo";
 
+// Fail the build if this route stops being fully prerendered
+export const ensureStatic = "navigation";
+
 export async function generateMetadata(
   _: unknown,
   parent: ResolvingMetadata

web/src/app/kontakt/page.tsx

@@ -5,6 +5,9 @@ import {
 } from "@/components/contact/ContactIndexView";
 import { getSeoMetadata } from "@/lib/seo";
 
+// Fail the build if this route stops being fully prerendered
+export const ensureStatic = "navigation";
+
 export async function generateMetadata(
   _: unknown,
   parent: ResolvingMetadata

web/src/app/layout.tsx

@@ -1,5 +1,7 @@
 import "@/css/main.scss";
-import { Header } from "@/components/layout/Header";
+import { SeasonalHeader } from "@/components/layout/SeasonalHeader";
+import { TodayProvider } from "@/components/general/Today";
+import { getOsloDay } from "@/lib/today";
 import { Footer } from "@/components/layout/Footer";
 import { Metadata } from "next";
 import { NuqsAdapter } from "nuqs/adapters/next/app";
@@ -26,11 +28,12 @@ export const metadata: Metadata = {
   ...baseUrlMetadata,
 };
 
-export default function RootLayout({
+export default async function RootLayout({
   children,
 }: Readonly<{
   children: React.ReactNode;
 }>) {
+  const day = await getOsloDay();
   return (
     <html lang="no">
       <head>
@@ -61,9 +64,11 @@ export default function RootLayout({
       </head>
       <body>
         <NuqsAdapter>
-          <Header />
-          {children}
-          <Footer />
+          <TodayProvider day={day}>
+            <SeasonalHeader />
+            {children}
+            <Footer />
+          </TodayProvider>
         </NuqsAdapter>
       </body>
     </html>

web/src/app/lokaler/[slug]/page.tsx

@@ -1,6 +1,6 @@
 import { Metadata, ResolvingMetadata } from "next";
 import { notFound } from "next/navigation";
-import { getClient } from "@/app/client";
+import { cmsQuery } from "@/app/client";
 import {
   VenuePageView,
   loadVenuePageProps,
@@ -8,6 +8,13 @@ import {
 import { graphql } from "@/gql";
 import { getSeoMetadata } from "@/lib/seo";
 
+// Fail the build if this route stops being fully prerendered
+export const ensureStatic = "navigation";
+
+// Navigations wait for the page instead of showing a loading shell first:
+// the response has to be able to turn into a real 404 for an unknown path
+export const instant = false;
+
 type Params = Promise<{ slug: string }>;
 
 const EXCLUDED_SLUGS = ["hele-huset"];
@@ -31,11 +38,7 @@ export async function generateStaticParams() {
       }
     }
   `);
-  const { data, error } = await getClient().query(allVenueSlugsQuery, {});
-
-  if (error) {
-    throw new Error(error.message);
-  }
+  const data = await cmsQuery(allVenueSlugsQuery, {});
   if (!data?.pages) {
     throw new Error(
       "Failed to generate static params for subpages of /lokaler"

web/src/app/lokaler/page.tsx

@@ -5,6 +5,9 @@ import {
 } from "@/components/venues/VenueIndexView";
 import { getSeoMetadata } from "@/lib/seo";
 
+// Fail the build if this route stops being fully prerendered
+export const ensureStatic = "navigation";
+
 export async function generateMetadata(
   _: unknown,
   parent: ResolvingMetadata

web/src/app/page.tsx

@@ -3,6 +3,9 @@ import {
   loadHomePageProps,
 } from "@/components/home/HomePageView";
 
+// Fail the build if this route stops being fully prerendered
+export const ensureStatic = "navigation";
+
 export default async function Home() {
   const props = await loadHomePageProps();
   return <HomePageView {...props} />;

web/src/app/preview/render/page.tsx

@@ -74,8 +74,10 @@ import {
   VenueRentalIndexFragment,
 } from "@/gql/graphql";
 import { cookies } from "next/headers";
-export const dynamic = "force-dynamic";
-export const revalidate = 0;
+
+// Rendered per request from the editor's preview cookie; there is nothing
+// to prerender, so let the route block instead of requiring a loading shell
+export const instant = false;
 
 const previewPageQuery = graphql(`
   query previewPage($token: String!) {

web/src/app/sok/page.tsx

@@ -1,3 +1,4 @@
+import { connection } from "next/server";
 import { getClient } from "@/app/client";
 import { uncached } from "@/lib/revalidation";
 import {
@@ -9,6 +10,10 @@ import { graphql } from "@/gql";
 
 // TODO: seo metadata?
 
+// Results depend on the query in the URL, so the route renders per request
+// and is allowed to block
+export const instant = false;
+
 export default async function Page({
   searchParams,
 }: {
@@ -17,6 +22,8 @@ export default async function Page({
   }>;
 }) {
   const { q: query } = (await searchParams) ?? {};
+  // search always runs at request time
+  await connection();
   let results: SearchResult[] = [];
   let totalCount = 0;
   const RESULT_LIMIT = 500;

web/src/app/sponsorer/page.tsx

@@ -5,6 +5,9 @@ import {
 } from "@/components/sponsor/SponsorsPageView";
 import { getSeoMetadata } from "@/lib/seo";
 
+// Fail the build if this route stops being fully prerendered
+export const ensureStatic = "navigation";
+
 export async function generateMetadata(
   _: unknown,
   parent: ResolvingMetadata

web/src/app/studio/page.tsx

@@ -5,6 +5,9 @@ import {
 } from "@/components/studio/StudioPageView";
 import { getSeoMetadata } from "@/lib/seo";
 
+// Fail the build if this route stops being fully prerendered
+export const ensureStatic = "navigation";
+
 export async function generateMetadata(
   _: unknown,
   parent: ResolvingMetadata

web/src/app/utleie/page.tsx

@@ -5,6 +5,9 @@ import {
 } from "@/components/venues/VenueRentalIndexView";
 import { getSeoMetadata } from "@/lib/seo";
 
+// Fail the build if this route stops being fully prerendered
+export const ensureStatic = "navigation";
+
 export async function generateMetadata(
   _: unknown,
   parent: ResolvingMetadata

web/src/components/associations/AssociationIndexView.tsx

@@ -1,6 +1,6 @@
 import { graphql } from "@/gql";
 import { AssociationFragment, AssociationIndexFragment } from "@/gql/graphql";
-import { getClient } from "@/app/client";
+import { cmsQuery } from "@/app/client";
 import { AssociationList } from "@/components/associations/AssociationList";
 import { PageHeader } from "@/components/general/PageHeader";
 import { PageContent } from "@/components/general/PageContent";
@@ -67,8 +67,7 @@ export type AssociationIndexViewProps = {
 export async function loadAssociationIndexProps(overrides?: {
   indexOverride?: AssociationIndexFragment;
 }): Promise<AssociationIndexViewProps> {
-  const { data, error } = await getClient().query(allAssociationsQuery, {});
-  if (error) throw new Error(error.message);
+  const data = await cmsQuery(allAssociationsQuery, {});
   const index =
     overrides?.indexOverride ?? (data?.index as AssociationIndexFragment | undefined);
   if (!index) throw new Error("Failed to load /foreninger");

web/src/components/associations/AssociationPageView.tsx

@@ -1,6 +1,6 @@
 import { graphql } from "@/gql";
 import { AssociationFragment } from "@/gql/graphql";
-import { getClient } from "@/app/client";
+import { cmsQuery } from "@/app/client";
 import { AssociationHeader } from "@/components/associations/AssociationHeader";
 import { PageContent } from "@/components/general/PageContent";
 
@@ -27,10 +27,9 @@ export async function loadAssociationPageProps(args: {
     return { association: args.associationOverride };
   }
   if (!args.slug) throw new Error("loadAssociationPageProps needs slug or associationOverride");
-  const { data, error } = await getClient().query(associationBySlugQuery, {
+  const data = await cmsQuery(associationBySlugQuery, {
     slug: args.slug,
   });
-  if (error) throw new Error(error.message);
   const association = data?.association as AssociationFragment | undefined;
   if (!association) return null;
   return { association };

web/src/components/blocks/OpeningHoursSectionBlock.tsx

@@ -3,6 +3,7 @@ import {
   getPrettyOpeningHoursForFunction,
   PrettyOpeningHours,
 } from "@/lib/openinghours";
+import { getToday } from "@/lib/today";
 import styles from "./openingHoursSectionBlock.module.scss";
 import { Fragment } from "react";
 
@@ -35,7 +36,7 @@ function OpeningHoursSubsection({
 }
 
 export async function OpeningHoursSectionBlock() {
-  const allOpeningHours = await getOpeningHours();
+  const allOpeningHours = await getOpeningHours(await getToday());
   const subsections = [
     ["glassbaren", "Glassbaren"],
     ["bokcafeen", "Bokcaféen"],

web/src/components/contact/ContactIndexView.tsx

@@ -1,6 +1,6 @@
 import { graphql } from "@/gql";
 import { ContactIndexFragment } from "@/gql/graphql";
-import { getClient } from "@/app/client";
+import { cmsQuery } from "@/app/client";
 import { GeneralContactBlock } from "@/components/blocks/GeneralContactBlock";
 import { PageContent } from "@/components/general/PageContent";
 import { PageHeader } from "@/components/general/PageHeader";
@@ -36,8 +36,7 @@ export async function loadContactIndexProps(overrides?: {
   if (overrides?.indexOverride) {
     return { index: overrides.indexOverride };
   }
-  const { data, error } = await getClient().query(contactQuery, {});
-  if (error) throw new Error(error.message);
+  const data = await cmsQuery(contactQuery, {});
   const index = data?.index as ContactIndexFragment | undefined;
   if (!index) throw new Error("Failed to load /kontakt");
   return { index };

web/src/components/events/DateList.tsx

@@ -8,22 +8,24 @@ import {
   compareDates,
 } from "@/lib/date";
 import { EventFragment, EventOccurrence } from "@/lib/event";
+import { useToday } from "@/components/general/Today";
 import styles from "./dateList.module.scss";
 import Link from "next/link";
 
 const DateListItem = ({ occurrence }: { occurrence: EventOccurrence }) => {
+  const today = useToday();
   const timeFormat = "'kl.' HH:mm";
   const wholeCastle = occurrence.venue?.slug === "hele-huset";
 
   return (
     <li
       className={`${styles.date} ${
-        isTodayOrFuture(occurrence.start) ? styles.future : styles.past
+        isTodayOrFuture(occurrence.start, today) ? styles.future : styles.past
       }`}
     >
       <div className={styles.time}>
         <span className={styles.day}>
-          {formatExtendedDateTime(occurrence.start, true)}
+          {formatExtendedDateTime(occurrence.start, today, true)}
         </span>{" "}
         <span className={styles.hour}>
           {formatDate(occurrence.start, timeFormat)}
@@ -49,6 +51,7 @@ const DateListItem = ({ occurrence }: { occurrence: EventOccurrence }) => {
 };
 
 export const DateList = ({ event }: { event: EventFragment }) => {
+  const today = useToday();
   const [showAllDates, setShowAllDates] = useState(false);
   function toggleDates() {
     setShowAllDates(!showAllDates);
@@ -57,7 +60,7 @@ export const DateList = ({ event }: { event: EventFragment }) => {
   const oneOff = event.occurrences.length === 1;
   const showToggle = event.occurrences.length > 4;
   const futureOccurrences = event.occurrences
-    .filter((occurrence) => isTodayOrFuture(occurrence.start))
+    .filter((occurrence) => isTodayOrFuture(occurrence.start, today))
     .sort((a, b) => compareDates(a.start, b.start));
 
   let visibleOccurrences = [];

web/src/components/events/EventContainer.tsx

@@ -24,6 +24,7 @@ import {
   getFilterableVenues,
 } from "@/lib/eventFilter";
 import { isTodayOrFuture } from "@/lib/date";
+import { useToday } from "@/components/general/Today";
 import styles from "./eventContainer.module.scss";
 import { formatDate, formatYearMonth } from "@/lib/date";
 import {
@@ -190,7 +191,7 @@ const CalendarDay = ({
   <div
     className={`${styles.calendarDay} ${events.length === 0 && styles.empty}`}
   >
-    <h3>{formatDate(parse(day, "yyyy-MM-dd", new Date()), "eeee dd.MM.")}</h3>
+    <h3>{formatDate(parse(day, "yyyy-MM-dd", new Date(0)), "eeee dd.MM.")}</h3>
     <ul>
       {events.map((event) => (
         <EventItem
@@ -234,10 +235,10 @@ const CalendarWeek = ({
   );
 };
 
-function srOnlyYear(yearMonthString: string) {
+function srOnlyYear(yearMonthString: string, today: Date) {
   // formatYearMonth only shows the year for non-current years; always expose it to screen readers
   const yearMonth = new Date(yearMonthString);
-  const isCurrentYear = yearMonth.getFullYear() === new Date().getFullYear();
+  const isCurrentYear = yearMonth.getFullYear() === today.getFullYear();
   if (!isCurrentYear) {
     return null;
   }
@@ -245,8 +246,9 @@ function srOnlyYear(yearMonthString: string) {
 }
 
 const EventCalendar = ({ events }: { events: EventOverviewItemFragment[] }) => {
+  const today = useToday();
   const futureSingularEvents = getSingularEvents(events).filter(
-    (x) => x.occurrence?.start && isTodayOrFuture(x.occurrence.start),
+    (x) => x.occurrence?.start && isTodayOrFuture(x.occurrence.start, today),
   );
   const eventsByDate = organizeEventsInCalendar(futureSingularEvents);
   const yearMonths = Object.keys(eventsByDate);
@@ -283,8 +285,8 @@ const EventCalendar = ({ events }: { events: EventOverviewItemFragment[] }) => {
               data-collapsed={!visibleYearMonths.includes(yearMonth)}
             >
               <h2 onClick={() => toggleYearMonth(yearMonth)}>
-                {formatYearMonth(yearMonth)}
-                {srOnlyYear(yearMonth)}{" "}
+                {formatYearMonth(yearMonth, today)}
+                {srOnlyYear(yearMonth, today)}{" "}
                 <span className={styles.eventCounter}>({eventCount})</span>
               </h2>
               {eventCount === 0 && (

web/src/components/events/EventIndexView.tsx

@@ -1,6 +1,7 @@
+import { Suspense } from "react";
+import { connection } from "next/server";
 import { VenueFragment } from "@/gql/graphql";
-import { getClient } from "@/app/client";
-import { cachedUntilOsloMidnight } from "@/lib/revalidation";
+import { cmsQueryForToday } from "@/app/client";
 import { EventContainer } from "@/components/events/EventContainer";
 import { PageHeader } from "@/components/general/PageHeader";
 import {
@@ -18,12 +19,7 @@ export type EventIndexViewProps = {
 };
 
 export async function loadEventIndexProps(): Promise<EventIndexViewProps> {
-  const { data, error } = await getClient().query(
-    eventsOverviewQuery,
-    {},
-    cachedUntilOsloMidnight()
-  );
-  if (error) throw new Error(error.message);
+  const data = await cmsQueryForToday(eventsOverviewQuery, {});
   if (
     !data?.index ||
     !data?.events?.futureEvents ||
@@ -41,21 +37,22 @@ export async function loadEventIndexProps(): Promise<EventIndexViewProps> {
   };
 }
 
-export function EventIndexView({
-  events,
-  eventCategories,
-  eventOrganizers,
-  venues,
-}: EventIndexViewProps) {
+// Waiting for the request makes the list render on the server per request,
+// with the visitor's filters from the URL already applied. Prerendered, it
+// would only appear after hydration and shift when the URL has filters
+async function RequestTimeEventContainer(props: EventIndexViewProps) {
+  await connection();
+  return <EventContainer {...props} />;
+}
+
+export function EventIndexView(props: EventIndexViewProps) {
   return (
     <main className="site-main" id="main">
       <PageHeader heading="Dette skjer på Chateau Neuf" align="left" />
-      <EventContainer
-        events={events}
-        eventCategories={eventCategories}
-        eventOrganizers={eventOrganizers}
-        venues={venues}
-      />
+      {/* the fallback reserves the list's height to keep the footer in place */}
+      <Suspense fallback={<div style={{ minHeight: "100vh" }} />}>
+        <RequestTimeEventContainer {...props} />
+      </Suspense>
     </main>
   );
 }

web/src/components/events/EventItem.tsx

@@ -3,6 +3,7 @@
 import styles from "./eventItem.module.scss";
 import Link from "next/link";
 import { Image } from "@/components/general/Image";
+import { useToday } from "@/components/general/Today";
 import {
   SingularEvent,
   EventFragment,
@@ -37,7 +38,8 @@ export const EventItem = ({
   imageLoading?: "eager" | "lazy";
   imageFetchPriority?: "high" | "low" | "auto";
 }) => {
-  const futureOccurrences = getFutureOccurrences(event);
+  const today = useToday();
+  const futureOccurrences = getFutureOccurrences(event, today);
   const groupedOccurrences = groupConsecutiveDates(
     futureOccurrences.map((occurrence) => occurrence.start)
   );

web/src/components/events/EventPageView.tsx

@@ -1,6 +1,6 @@
 import { graphql } from "@/gql";
 import { EventFragment } from "@/gql/graphql";
-import { getClient } from "@/app/client";
+import { cmsQuery } from "@/app/client";
 import { EventDetails } from "@/components/events/EventDetails";
 import { EventHeader } from "@/components/events/EventHeader";
 import { BgPig } from "@/components/general/BgPig";
@@ -28,10 +28,9 @@ export async function loadEventPageProps(args: {
     return { event: args.eventOverride };
   }
   if (!args.slug) throw new Error("loadEventPageProps needs slug or eventOverride");
-  const { data, error } = await getClient().query(eventBySlugQuery, {
+  const data = await cmsQuery(eventBySlugQuery, {
     slug: args.slug,
   });
-  if (error) throw new Error(error.message);
   const event = data?.event as EventFragment | undefined;
   if (!event) return null;
   return { event };

web/src/components/events/UpcomingEvents.tsx

@@ -9,11 +9,13 @@ import { EventItem } from "./EventItem";
 import styles from "./upcomingEvents.module.scss";
 import { SectionHeader } from "../general/SectionHeader";
 import { SectionFooter } from "../general/SectionFooter";
+import { getToday } from "@/lib/today";
 
-export const UpcomingEvents = ({ events }: { events: EventListItemFragment[] }) => {
+export const UpcomingEvents = async ({ events }: { events: EventListItemFragment[] }) => {
+  const today = await getToday();
   const upcomingSingularEvents = sortSingularEvents(
     getSingularEvents(events).filter((event) =>
-      isTodayOrFuture(event.occurrence.start)
+      isTodayOrFuture(event.occurrence.start, today)
     )
   );
   const sliced = upcomingSingularEvents.slice(0, 10);
@@ -30,7 +32,7 @@ export const UpcomingEvents = ({ events }: { events: EventListItemFragment[] })
               <div key={day}>
                 {/*<h3>
                   {formatDate(
-                    parse(day, "yyyy-MM-dd", new Date()),
+                    parse(day, "yyyy-MM-dd", new Date(0)),
                     "eeee dd.MM."
                   )}
                 </h3>*/}

web/src/components/general/GenericPageView.tsx

@@ -1,6 +1,6 @@
 import { graphql } from "@/gql";
 import { GenericFragment } from "@/gql/graphql";
-import { getClient } from "@/app/client";
+import { cmsQuery } from "@/app/client";
 import { PageHeader } from "@/components/general/PageHeader";
 import { PageContent } from "@/components/general/PageContent";
 import { BgPig } from "@/components/general/BgPig";
@@ -41,10 +41,9 @@ export async function loadGenericPageProps(args: {
     return { page: args.pageOverride };
   }
   if (!args.urlPath) throw new Error("loadGenericPageProps needs urlPath or pageOverride");
-  const { data, error } = await getClient().query(genericPageByUrlPathQuery, {
+  const data = await cmsQuery(genericPageByUrlPathQuery, {
     urlPath: args.urlPath,
   });
-  if (error) throw new Error(error.message);
   const page = data?.page as GenericFragment | undefined;
   if (!page) return null;
   return { page };

web/src/components/general/Today.tsx

@@ -0,0 +1,43 @@
+"use client";
+
+import { createContext, useContext, useMemo, useSyncExternalStore } from "react";
+import { osloDay, startOfOsloDay } from "@/lib/date";
+
+const TodayContext = createContext<string | null>(null);
+
+function subscribeToClock(onChange: () => void) {
+  const interval = setInterval(onChange, 60_000);
+  document.addEventListener("visibilitychange", onChange);
+  return () => {
+    clearInterval(interval);
+    document.removeEventListener("visibilitychange", onChange);
+  };
+}
+
+// Hands the server's Oslo day to Client Components, which can't read the
+// clock in a prerendered page (and would disagree with the server if they did)
+export function TodayProvider({
+  day,
+  children,
+}: {
+  day: string;
+  children: React.ReactNode;
+}) {
+  // The root layout isn't rendered again on navigation, so a tab left open
+  // past midnight would keep the server's day. After hydration, follow the
+  // browser's clock once it is ahead
+  const clientDay = useSyncExternalStore(subscribeToClock, osloDay, () => day);
+  const today = clientDay > day ? clientDay : day;
+  return (
+    <TodayContext.Provider value={today}>{children}</TodayContext.Provider>
+  );
+}
+
+// Start of the current Oslo day
+export function useToday(): Date {
+  const day = useContext(TodayContext);
+  if (!day) {
+    throw new Error("useToday must be used within a TodayProvider");
+  }
+  return useMemo(() => startOfOsloDay(day), [day]);
+}

web/src/components/home/HomePageView.tsx

@@ -1,8 +1,7 @@
 import Link from "next/link";
 import { graphql } from "@/gql";
 import { HomeFragment } from "@/gql/graphql";
-import { getClient } from "@/app/client";
-import { cachedUntilOsloMidnight } from "@/lib/revalidation";
+import { cmsQueryForToday } from "@/app/client";
 import { EventListItemFragment } from "@/lib/event";
 import { NewsListItemFragment } from "@/lib/news";
 import { FeaturedEvents } from "@/components/events/FeaturedEvents";
@@ -57,12 +56,7 @@ export type HomePageViewProps = {
 export async function loadHomePageProps(overrides?: {
   homeOverride?: HomeFragment;
 }): Promise<HomePageViewProps> {
-  const { data, error } = await getClient().query(
-    homeQuery,
-    {},
-    cachedUntilOsloMidnight()
-  );
-  if (error) throw new Error(error.message);
+  const data = await cmsQueryForToday(homeQuery, {});
   const home = overrides?.homeOverride ?? (data?.home as HomeFragment | undefined);
   if (!home) throw new Error("Failed to load /");
   const events = (data?.events?.futureEvents ?? []) as EventListItemFragment[];

web/src/components/layout/Footer.tsx

@@ -2,6 +2,7 @@ import {
   getOpeningHours,
   getTodaysOpeningHoursForFunction,
 } from "@/lib/openinghours";
+import { getToday } from "@/lib/today";
 import Link from "next/link";
 import { Icon } from "../general/Icon";
 // import { NeonChillPig } from "../general/pigs/fun/NeonChillPig";
@@ -9,7 +10,8 @@ import styles from "./footer.module.scss";
 import { PigPattern } from "./PigPattern";
 
 async function OpeningHoursTable() {
-  const allOpeningHours = await getOpeningHours();
+  const today = await getToday();
+  const allOpeningHours = await getOpeningHours(today);
   const subsections = [
     ["glassbaren", "Glassbaren"],
     ["bokcafeen", "Bokcaféen"],
@@ -21,7 +23,11 @@ async function OpeningHoursTable() {
       <tbody>
         {subsections.map((subsection) => {
           const [slug, title] = subsection;
-          const hours = getTodaysOpeningHoursForFunction(allOpeningHours, slug);
+          const hours = getTodaysOpeningHoursForFunction(
+            allOpeningHours,
+            slug,
+            today,
+          );
           return (
             <tr key={slug}>
               <td>{title}</td>

web/src/components/layout/Header.tsx

@@ -8,7 +8,13 @@ import { Icon } from "../general/Icon";
 import { useInView } from "react-intersection-observer";
 import { getSearchPath } from "@/lib/common";
 
-export const Header = () => {
+export const Header = ({
+  christmas,
+  studentHat,
+}: {
+  christmas: boolean;
+  studentHat: boolean;
+}) => {
   /*
     This component depends on the following CSS rule in base.css to prevent scrolling
     the body while the menu is open:
@@ -51,16 +57,6 @@ export const Header = () => {
     }
   };
 
-  // let's add a santa hat during December
-  const isChristmas = new Date().getMonth() === 11;
-
-  // let's add the student hat during STUDiO 2026
-  const pigWearsHat =
-    new Date().getFullYear() === 2026 &&
-    new Date().getMonth() === 7 &&
-    new Date().getDate() >= 10 &&
-    new Date().getDate() <= 16;
-
   return (
     <>
       <header
@@ -70,7 +66,7 @@ export const Header = () => {
         data-small={!isInView}
       >
         <Link href="/" aria-label="Hjem">
-          <Logo christmas={isChristmas} studentHat={pigWearsHat} />
+          <Logo christmas={christmas} studentHat={studentHat} />
         </Link>
         <nav className={styles.siteMenu}>
           <ul className={styles.mainMenu}>
@@ -193,7 +189,7 @@ export const Header = () => {
         </nav>
         <div className={styles.headerBar} aria-hidden>
           <Link href="/" aria-label="Hjem" tabIndex={-1}>
-            <LogoIcon face="left" christmas={isChristmas} />
+            <LogoIcon face="left" christmas={christmas} />
           </Link>
           <nav className={styles.siteMenu}>
             <ul className={styles.mainMenu}>

web/src/components/layout/SeasonalHeader.tsx

@@ -0,0 +1,20 @@
+import { getToday } from "@/lib/today";
+import { Header } from "./Header";
+
+// The logo's hats depend on today's date, which the prerendered Header
+// (a Client Component) can't read itself
+export async function SeasonalHeader() {
+  const today = await getToday();
+
+  // let's add a santa hat during December
+  const christmas = today.getMonth() === 11;
+
+  // let's add the student hat during STUDiO 2026
+  const studentHat =
+    today.getFullYear() === 2026 &&
+    today.getMonth() === 7 &&
+    today.getDate() >= 10 &&
+    today.getDate() <= 16;
+
+  return <Header christmas={christmas} studentHat={studentHat} />;
+}

web/src/components/news/NewsIndexView.tsx

@@ -1,4 +1,4 @@
-import { getClient } from "@/app/client";
+import { cmsQuery } from "@/app/client";
 import { PageHeader } from "@/components/general/PageHeader";
 import { NewsList } from "@/components/news/NewsList";
 import { NewsIndexFragment, NewsListItemFragment, newsQuery } from "@/lib/news";
@@ -11,8 +11,7 @@ export type NewsIndexViewProps = {
 export async function loadNewsIndexProps(overrides?: {
   indexOverride?: NewsIndexFragment;
 }): Promise<NewsIndexViewProps> {
-  const { data, error } = await getClient().query(newsQuery, {});
-  if (error) throw new Error(error.message);
+  const data = await cmsQuery(newsQuery, {});
   const index = overrides?.indexOverride ?? (data?.index as NewsIndexFragment | undefined);
   if (!index) throw new Error("Failed to load /aktuelt");
   const news = (data?.news ?? []) as NewsListItemFragment[];

web/src/components/news/NewsPageView.tsx

@@ -1,6 +1,6 @@
 import { graphql } from "@/gql";
 import { NewsFragment } from "@/gql/graphql";
-import { getClient } from "@/app/client";
+import { cmsQuery } from "@/app/client";
 import { Breadcrumb } from "@/components/general/Breadcrumb";
 import { ImageFigure } from "@/components/general/Image";
 import { PageContent } from "@/components/general/PageContent";
@@ -27,10 +27,9 @@ export async function loadNewsPageProps(args: {
     return { news: args.newsOverride };
   }
   if (!args.slug) throw new Error("loadNewsPageProps needs slug or newsOverride");
-  const { data, error } = await getClient().query(newsBySlugQuery, {
+  const data = await cmsQuery(newsBySlugQuery, {
     slug: args.slug,
   });
-  if (error) throw new Error(error.message);
   const news = data?.news as NewsFragment | undefined;
   if (!news) return null;
   return { news };

web/src/components/sponsor/SponsorsPageView.tsx

@@ -1,6 +1,6 @@
 import { graphql } from "@/gql";
 import { type SponsorFragment, type SponsorsPageFragment } from "@/gql/graphql";
-import { getClient } from "@/app/client";
+import { cmsQuery } from "@/app/client";
 import { PageHeader } from "@/components/general/PageHeader";
 import { PageContent } from "@/components/general/PageContent";
 import { SponsorList } from "@/components/sponsor/SponsorList";
@@ -41,8 +41,7 @@ export async function loadSponsorsPageProps(overrides?: {
   if (overrides?.pageOverride) {
     return { page: overrides.pageOverride };
   }
-  const { data, error } = await getClient().query(sponsorsPageQuery, {});
-  if (error) throw new Error(error.message);
+  const data = await cmsQuery(sponsorsPageQuery, {});
   const page = data?.page as SponsorsPageFragment | undefined;
   if (!page) throw new Error("Failed to load /sponsorer");
   return { page };

web/src/components/studio/StudioPageView.tsx

@@ -1,6 +1,6 @@
 import { graphql } from "@/gql";
 import { type StudioFragment } from "@/gql/graphql";
-import { getClient } from "@/app/client";
+import { cmsQuery } from "@/app/client";
 import { PageContent } from "@/components/general/PageContent";
 import { BgPig } from "@/components/general/BgPig";
 import { StudioHeader } from "@/components/studio/StudioHeader";
@@ -45,8 +45,7 @@ export async function loadStudioPageProps(overrides?: {
   if (overrides?.pageOverride) {
     return { page: overrides.pageOverride };
   }
-  const { data, error } = await getClient().query(studioPageQuery, {});
-  if (error) throw new Error(error.message);
+  const data = await cmsQuery(studioPageQuery, {});
   const page = data?.page as StudioFragment | undefined;
   if (!page) throw new Error("Failed to load /studio");
   return { page };

web/src/components/studio/StudioShortcut.tsx

@@ -1,14 +1,15 @@
-import { fromZonedTime } from "date-fns-tz";
 import Link from "next/link";
 import { Icon } from "../general/Icon";
 import styles from "./studioShortcut.module.scss";
+import { startOfOsloDay } from "@/lib/date";
+import { getToday } from "@/lib/today";
 
 // Hidden from this date
 // Note that home page revalidation happens at midnight
-const showUntil = fromZonedTime("2026-08-16T00:00:00", "Europe/Oslo");
+const showUntil = startOfOsloDay("2026-08-16");
 
-export const StudioShortcut = () => {
-  if (new Date() >= showUntil) return null;
+export const StudioShortcut = async () => {
+  if ((await getToday()) >= showUntil) return null;
 
   return (
     <div className={styles.studioShortcut}>

web/src/components/venues/VenueIndexView.tsx

@@ -1,6 +1,6 @@
 import { graphql } from "@/gql";
 import { VenueFragment, VenueIndexFragment } from "@/gql/graphql";
-import { getClient } from "@/app/client";
+import { cmsQuery } from "@/app/client";
 import { PageContent } from "@/components/general/PageContent";
 import { PageHeader } from "@/components/general/PageHeader";
 import { VenueList } from "@/components/venues/VenueList";
@@ -77,8 +77,7 @@ export type VenueIndexViewProps = {
 export async function loadVenueIndexProps(overrides?: {
   indexOverride?: VenueIndexFragment;
 }): Promise<VenueIndexViewProps> {
-  const { data, error } = await getClient().query(venueIndexQuery, {});
-  if (error) throw new Error(error.message);
+  const data = await cmsQuery(venueIndexQuery, {});
   const index = overrides?.indexOverride ?? (data?.index as VenueIndexFragment | undefined);
   if (!index) throw new Error("Failed to load /lokaler");
   const venues = (data?.venues ?? []) as VenueFragment[];

web/src/components/venues/VenuePageView.tsx

@@ -1,6 +1,6 @@
 import dynamic from "next/dynamic";
 import { VenueFragment } from "@/gql/graphql";
-import { getClient } from "@/app/client";
+import { cmsQuery } from "@/app/client";
 import { ImageSliderBlockFragmentDefinition } from "@/components/blocks/ImageSliderBlock";
 import { Breadcrumb } from "@/components/general/Breadcrumb";
 import { PageContent } from "@/components/general/PageContent";
@@ -32,10 +32,9 @@ export async function loadVenuePageProps(args: {
     return { venue: args.venueOverride };
   }
   if (!args.slug) throw new Error("loadVenuePageProps needs slug or venueOverride");
-  const { data, error } = await getClient().query(venueBySlugQuery, {
+  const data = await cmsQuery(venueBySlugQuery, {
     slug: args.slug,
   });
-  if (error) throw new Error(error.message);
   const venue = data?.venue as VenueFragment | undefined;
   if (!venue) return null;
   return { venue };

web/src/components/venues/VenueRentalIndexView.tsx

@@ -1,6 +1,6 @@
 import { graphql } from "@/gql";
 import { VenueFragment, VenueRentalIndexFragment } from "@/gql/graphql";
-import { getClient } from "@/app/client";
+import { cmsQuery } from "@/app/client";
 import { BgPig } from "@/components/general/BgPig";
 import { PageContent } from "@/components/general/PageContent";
 import { PageHeader } from "@/components/general/PageHeader";
@@ -42,8 +42,7 @@ export type VenueRentalIndexViewProps = {
 export async function loadVenueRentalIndexProps(overrides?: {
   indexOverride?: VenueRentalIndexFragment;
 }): Promise<VenueRentalIndexViewProps> {
-  const { data, error } = await getClient().query(venueRentalIndexQuery, {});
-  if (error) throw new Error(error.message);
+  const data = await cmsQuery(venueRentalIndexQuery, {});
   const index =
     overrides?.indexOverride ?? (data?.index as VenueRentalIndexFragment | undefined);
   if (!index) throw new Error("Failed to load /utleie");

web/src/gql/gql.ts

@@ -80,6 +80,7 @@ type Documents = {
     "\n  fragment OpeningHoursSet on OpeningHoursSet {\n    name\n    effectiveFrom\n    effectiveTo\n    announcement\n    items {\n      id\n      function\n      week {\n        __typename\n        ... on OpeningHoursWeekBlock {\n          ...OpeningHoursWeekBlock\n        }\n      }\n    }\n  }\n": typeof types.OpeningHoursSetFragmentDoc,
     "\n  fragment OpeningHoursRangeBlock on OpeningHoursRangeBlock {\n    timeFrom\n    timeTo\n    custom\n  }\n": typeof types.OpeningHoursRangeBlockFragmentDoc,
     "\n  fragment OpeningHoursWeekBlock on OpeningHoursWeekBlock {\n    monday {\n      ... on OpeningHoursRangeBlock {\n        ...OpeningHoursRangeBlock\n      }\n    }\n    tuesday {\n      ... on OpeningHoursRangeBlock {\n        ...OpeningHoursRangeBlock\n      }\n    }\n    wednesday {\n      ... on OpeningHoursRangeBlock {\n        ...OpeningHoursRangeBlock\n      }\n    }\n    thursday {\n      ... on OpeningHoursRangeBlock {\n        ...OpeningHoursRangeBlock\n      }\n    }\n    friday {\n      ... on OpeningHoursRangeBlock {\n        ...OpeningHoursRangeBlock\n      }\n    }\n    saturday {\n      ... on OpeningHoursRangeBlock {\n        ...OpeningHoursRangeBlock\n      }\n    }\n    sunday {\n      ... on OpeningHoursRangeBlock {\n        ...OpeningHoursRangeBlock\n      }\n    }\n  }\n": typeof types.OpeningHoursWeekBlockFragmentDoc,
+    "\n  query latestPageSlug($contentType: String!) {\n    pages(contentType: $contentType, order: \"-first_published_at\", limit: 1) {\n      id\n      slug\n    }\n  }\n": typeof types.LatestPageSlugDocument,
 };
 const documents: Documents = {
     "\n    query allGenericSlugs {\n      pages(contentType: \"generic.GenericPage\") {\n        id\n        urlPath\n      }\n    }\n  ": types.AllGenericSlugsDocument,
@@ -148,6 +149,7 @@ const documents: Documents = {
     "\n  fragment OpeningHoursSet on OpeningHoursSet {\n    name\n    effectiveFrom\n    effectiveTo\n    announcement\n    items {\n      id\n      function\n      week {\n        __typename\n        ... on OpeningHoursWeekBlock {\n          ...OpeningHoursWeekBlock\n        }\n      }\n    }\n  }\n": types.OpeningHoursSetFragmentDoc,
     "\n  fragment OpeningHoursRangeBlock on OpeningHoursRangeBlock {\n    timeFrom\n    timeTo\n    custom\n  }\n": types.OpeningHoursRangeBlockFragmentDoc,
     "\n  fragment OpeningHoursWeekBlock on OpeningHoursWeekBlock {\n    monday {\n      ... on OpeningHoursRangeBlock {\n        ...OpeningHoursRangeBlock\n      }\n    }\n    tuesday {\n      ... on OpeningHoursRangeBlock {\n        ...OpeningHoursRangeBlock\n      }\n    }\n    wednesday {\n      ... on OpeningHoursRangeBlock {\n        ...OpeningHoursRangeBlock\n      }\n    }\n    thursday {\n      ... on OpeningHoursRangeBlock {\n        ...OpeningHoursRangeBlock\n      }\n    }\n    friday {\n      ... on OpeningHoursRangeBlock {\n        ...OpeningHoursRangeBlock\n      }\n    }\n    saturday {\n      ... on OpeningHoursRangeBlock {\n        ...OpeningHoursRangeBlock\n      }\n    }\n    sunday {\n      ... on OpeningHoursRangeBlock {\n        ...OpeningHoursRangeBlock\n      }\n    }\n  }\n": types.OpeningHoursWeekBlockFragmentDoc,
+    "\n  query latestPageSlug($contentType: String!) {\n    pages(contentType: $contentType, order: \"-first_published_at\", limit: 1) {\n      id\n      slug\n    }\n  }\n": types.LatestPageSlugDocument,
 };
 
 /**
@@ -428,6 +430,10 @@ export function graphql(source: "\n  fragment OpeningHoursRangeBlock on OpeningH
  * The graphql function is used to parse GraphQL queries into a document that can be used by GraphQL clients.
  */
 export function graphql(source: "\n  fragment OpeningHoursWeekBlock on OpeningHoursWeekBlock {\n    monday {\n      ... on OpeningHoursRangeBlock {\n        ...OpeningHoursRangeBlock\n      }\n    }\n    tuesday {\n      ... on OpeningHoursRangeBlock {\n        ...OpeningHoursRangeBlock\n      }\n    }\n    wednesday {\n      ... on OpeningHoursRangeBlock {\n        ...OpeningHoursRangeBlock\n      }\n    }\n    thursday {\n      ... on OpeningHoursRangeBlock {\n        ...OpeningHoursRangeBlock\n      }\n    }\n    friday {\n      ... on OpeningHoursRangeBlock {\n        ...OpeningHoursRangeBlock\n      }\n    }\n    saturday {\n      ... on OpeningHoursRangeBlock {\n        ...OpeningHoursRangeBlock\n      }\n    }\n    sunday {\n      ... on OpeningHoursRangeBlock {\n        ...OpeningHoursRangeBlock\n      }\n    }\n  }\n"): (typeof documents)["\n  fragment OpeningHoursWeekBlock on OpeningHoursWeekBlock {\n    monday {\n      ... on OpeningHoursRangeBlock {\n        ...OpeningHoursRangeBlock\n      }\n    }\n    tuesday {\n      ... on OpeningHoursRangeBlock {\n        ...OpeningHoursRangeBlock\n      }\n    }\n    wednesday {\n      ... on OpeningHoursRangeBlock {\n        ...OpeningHoursRangeBlock\n      }\n    }\n    thursday {\n      ... on OpeningHoursRangeBlock {\n        ...OpeningHoursRangeBlock\n      }\n    }\n    friday {\n      ... on OpeningHoursRangeBlock {\n        ...OpeningHoursRangeBlock\n      }\n    }\n    saturday {\n      ... on OpeningHoursRangeBlock {\n        ...OpeningHoursRangeBlock\n      }\n    }\n    sunday {\n      ... on OpeningHoursRangeBlock {\n        ...OpeningHoursRangeBlock\n      }\n    }\n  }\n"];
+/**
+ * The graphql function is used to parse GraphQL queries into a document that can be used by GraphQL clients.
+ */
+export function graphql(source: "\n  query latestPageSlug($contentType: String!) {\n    pages(contentType: $contentType, order: \"-first_published_at\", limit: 1) {\n      id\n      slug\n    }\n  }\n"): (typeof documents)["\n  query latestPageSlug($contentType: String!) {\n    pages(contentType: $contentType, order: \"-first_published_at\", limit: 1) {\n      id\n      slug\n    }\n  }\n"];
 
 export function graphql(source: string) {
   return (documents as any)[source] ?? {};

web/src/gql/graphql.ts

@@ -2037,6 +2037,29 @@ export type OpeningHoursWeekBlockFragment = { monday:
     | Record<PropertyKey, never>
    | null } & { ' $fragmentName'?: 'OpeningHoursWeekBlockFragment' };
 
+export type LatestPageSlugQueryVariables = Exact<{
+  contentType: string;
+}>;
+
+
+export type LatestPageSlugQuery = { pages: Array<
+    | { id: string | null, slug: string }
+    | { id: string | null, slug: string }
+    | { id: string | null, slug: string }
+    | { id: string | null, slug: string }
+    | { id: string | null, slug: string }
+    | { id: string | null, slug: string }
+    | { id: string | null, slug: string }
+    | { id: string | null, slug: string }
+    | { id: string | null, slug: string }
+    | { id: string | null, slug: string }
+    | { id: string | null, slug: string }
+    | { id: string | null, slug: string }
+    | { id: string | null, slug: string }
+    | { id: string | null, slug: string }
+    | { id: string | null, slug: string }
+  > };
+
 export const RichTextBlockFragmentDoc = {"kind":"Document","definitions":[{"kind":"FragmentDefinition","name":{"kind":"Name","value":"RichTextBlock"},"typeCondition":{"kind":"NamedType","name":{"kind":"Name","value":"RichTextBlock"}},"selectionSet":{"kind":"SelectionSet","selections":[{"kind":"Field","name":{"kind":"Name","value":"rawValue"}},{"kind":"Field","name":{"kind":"Name","value":"value"}}]}}]} as unknown as DocumentNode<RichTextBlockFragment, unknown>;
 export const ImageFragmentDoc = {"kind":"Document","definitions":[{"kind":"FragmentDefinition","name":{"kind":"Name","value":"Image"},"typeCondition":{"kind":"NamedType","name":{"kind":"Name","value":"CustomImage"}},"selectionSet":{"kind":"SelectionSet","selections":[{"kind":"Field","name":{"kind":"Name","value":"id"}},{"kind":"Field","name":{"kind":"Name","value":"url"}},{"kind":"Field","name":{"kind":"Name","value":"width"}},{"kind":"Field","name":{"kind":"Name","value":"height"}},{"kind":"Field","name":{"kind":"Name","value":"alt"}},{"kind":"Field","name":{"kind":"Name","value":"attribution"}}]}}]} as unknown as DocumentNode<ImageFragment, unknown>;
 export const ImageWithTextBlockFragmentDoc = {"kind":"Document","definitions":[{"kind":"FragmentDefinition","name":{"kind":"Name","value":"ImageWithTextBlock"},"typeCondition":{"kind":"NamedType","name":{"kind":"Name","value":"ImageWithTextBlock"}},"selectionSet":{"kind":"SelectionSet","selections":[{"kind":"Field","name":{"kind":"Name","value":"image"},"selectionSet":{"kind":"SelectionSet","selections":[{"kind":"FragmentSpread","name":{"kind":"Name","value":"Image"}}]}},{"kind":"Field","name":{"kind":"Name","value":"imageFormat"}},{"kind":"Field","name":{"kind":"Name","value":"text"}}]}},{"kind":"FragmentDefinition","name":{"kind":"Name","value":"Image"},"typeCondition":{"kind":"NamedType","name":{"kind":"Name","value":"CustomImage"}},"selectionSet":{"kind":"SelectionSet","selections":[{"kind":"Field","name":{"kind":"Name","value":"id"}},{"kind":"Field","name":{"kind":"Name","value":"url"}},{"kind":"Field","name":{"kind":"Name","value":"width"}},{"kind":"Field","name":{"kind":"Name","value":"height"}},{"kind":"Field","name":{"kind":"Name","value":"alt"}},{"kind":"Field","name":{"kind":"Name","value":"attribution"}}]}}]} as unknown as DocumentNode<ImageWithTextBlockFragment, unknown>;
@@ -2102,4 +2125,5 @@ export const EventIndexMetadataDocument = {"kind":"Document","definitions":[{"ki
 export const FutureEventsDocument = {"kind":"Document","definitions":[{"kind":"OperationDefinition","operation":"query","name":{"kind":"Name","value":"futureEvents"},"selectionSet":{"kind":"SelectionSet","selections":[{"kind":"Field","alias":{"kind":"Name","value":"index"},"name":{"kind":"Name","value":"eventIndex"},"selectionSet":{"kind":"SelectionSet","selections":[{"kind":"InlineFragment","typeCondition":{"kind":"NamedType","name":{"kind":"Name","value":"EventIndex"}},"selectionSet":{"kind":"SelectionSet","selections":[{"kind":"FragmentSpread","name":{"kind":"Name","value":"EventIndex"}}]}}]}},{"kind":"Field","alias":{"kind":"Name","value":"events"},"name":{"kind":"Name","value":"eventIndex"},"selectionSet":{"kind":"SelectionSet","selections":[{"kind":"InlineFragment","typeCondition":{"kind":"NamedType","name":{"kind":"Name","value":"EventIndex"}},"selectionSet":{"kind":"SelectionSet","selections":[{"kind":"Field","name":{"kind":"Name","value":"futureEvents"},"selectionSet":{"kind":"SelectionSet","selections":[{"kind":"InlineFragment","typeCondition":{"kind":"NamedType","name":{"kind":"Name","value":"EventPage"}},"selectionSet":{"kind":"SelectionSet","selections":[{"kind":"FragmentSpread","name":{"kind":"Name","value":"EventOverviewItem"}}]}}]}}]}}]}},{"kind":"Field","alias":{"kind":"Name","value":"eventCategories"},"name":{"kind":"Name","value":"eventCategories"},"arguments":[{"kind":"Argument","name":{"kind":"Name","value":"limit"},"value":{"kind":"IntValue","value":"5000"}}],"selectionSet":{"kind":"SelectionSet","selections":[{"kind":"InlineFragment","typeCondition":{"kind":"NamedType","name":{"kind":"Name","value":"EventCategory"}},"selectionSet":{"kind":"SelectionSet","selections":[{"kind":"FragmentSpread","name":{"kind":"Name","value":"EventCategory"}}]}}]}},{"kind":"Field","alias":{"kind":"Name","value":"eventOrganizers"},"name":{"kind":"Name","value":"eventOrganizers"},"arguments":[{"kind":"Argument","name":{"kind":"Name","value":"limit"},"value":{"kind":"IntValue","value":"5000"}}],"selectionSet":{"kind":"SelectionSet","selections":[{"kind":"InlineFragment","typeCondition":{"kind":"NamedType","name":{"kind":"Name","value":"EventOrganizer"}},"selectionSet":{"kind":"SelectionSet","selections":[{"kind":"FragmentSpread","name":{"kind":"Name","value":"EventOrganizer"}}]}}]}},{"kind":"Field","alias":{"kind":"Name","value":"venues"},"name":{"kind":"Name","value":"pages"},"arguments":[{"kind":"Argument","name":{"kind":"Name","value":"contentType"},"value":{"kind":"StringValue","value":"venues.VenuePage","block":false}}],"selectionSet":{"kind":"SelectionSet","selections":[{"kind":"InlineFragment","typeCondition":{"kind":"NamedType","name":{"kind":"Name","value":"VenuePage"}},"selectionSet":{"kind":"SelectionSet","selections":[{"kind":"Field","name":{"kind":"Name","value":"id"}},{"kind":"Field","name":{"kind":"Name","value":"title"}},{"kind":"Field","name":{"kind":"Name","value":"slug"}},{"kind":"Field","name":{"kind":"Name","value":"preposition"}}]}}]}}]}},{"kind":"FragmentDefinition","name":{"kind":"Name","value":"Image"},"typeCondition":{"kind":"NamedType","name":{"kind":"Name","value":"CustomImage"}},"selectionSet":{"kind":"SelectionSet","selections":[{"kind":"Field","name":{"kind":"Name","value":"id"}},{"kind":"Field","name":{"kind":"Name","value":"url"}},{"kind":"Field","name":{"kind":"Name","value":"width"}},{"kind":"Field","name":{"kind":"Name","value":"height"}},{"kind":"Field","name":{"kind":"Name","value":"alt"}},{"kind":"Field","name":{"kind":"Name","value":"attribution"}}]}},{"kind":"FragmentDefinition","name":{"kind":"Name","value":"EventCategory"},"typeCondition":{"kind":"NamedType","name":{"kind":"Name","value":"EventCategory"}},"selectionSet":{"kind":"SelectionSet","selections":[{"kind":"Field","name":{"kind":"Name","value":"__typename"}},{"kind":"Field","name":{"kind":"Name","value":"name"}},{"kind":"Field","name":{"kind":"Name","value":"slug"}},{"kind":"Field","name":{"kind":"Name","value":"pig"}},{"kind":"Field","name":{"kind":"Name","value":"showInFilters"}}]}},{"kind":"FragmentDefinition","name":{"kind":"Name","value":"EventOrganizer"},"typeCondition":{"kind":"NamedType","name":{"kind":"Name","value":"EventOrganizer"}},"selectionSet":{"kind":"SelectionSet","selections":[{"kind":"Field","name":{"kind":"Name","value":"__typename"}},{"kind":"Field","name":{"kind":"Name","value":"id"}},{"kind":"Field","name":{"kind":"Name","value":"name"}},{"kind":"Field","name":{"kind":"Name","value":"slug"}},{"kind":"Field","name":{"kind":"Name","value":"externalUrl"}},{"kind":"Field","name":{"kind":"Name","value":"association"},"selectionSet":{"kind":"SelectionSet","selections":[{"kind":"InlineFragment","typeCondition":{"kind":"NamedType","name":{"kind":"Name","value":"AssociationPage"}},"selectionSet":{"kind":"SelectionSet","selections":[{"kind":"Field","name":{"kind":"Name","value":"url"}}]}}]}}]}},{"kind":"FragmentDefinition","name":{"kind":"Name","value":"EventIndex"},"typeCondition":{"kind":"NamLine truncated
 export const NewsIndexMetadataDocument = {"kind":"Document","definitions":[{"kind":"OperationDefinition","operation":"query","name":{"kind":"Name","value":"newsIndexMetadata"},"selectionSet":{"kind":"SelectionSet","selections":[{"kind":"Field","alias":{"kind":"Name","value":"index"},"name":{"kind":"Name","value":"newsIndex"},"selectionSet":{"kind":"SelectionSet","selections":[{"kind":"InlineFragment","typeCondition":{"kind":"NamedType","name":{"kind":"Name","value":"NewsIndex"}},"selectionSet":{"kind":"SelectionSet","selections":[{"kind":"FragmentSpread","name":{"kind":"Name","value":"NewsIndex"}}]}}]}}]}},{"kind":"FragmentDefinition","name":{"kind":"Name","value":"NewsIndex"},"typeCondition":{"kind":"NamedType","name":{"kind":"Name","value":"NewsIndex"}},"selectionSet":{"kind":"SelectionSet","selections":[{"kind":"Field","name":{"kind":"Name","value":"__typename"}},{"kind":"Field","name":{"kind":"Name","value":"id"}},{"kind":"Field","name":{"kind":"Name","value":"slug"}},{"kind":"Field","name":{"kind":"Name","value":"seoTitle"}},{"kind":"Field","name":{"kind":"Name","value":"searchDescription"}},{"kind":"Field","name":{"kind":"Name","value":"title"}},{"kind":"Field","name":{"kind":"Name","value":"lead"}}]}}]} as unknown as DocumentNode<NewsIndexMetadataQuery, NewsIndexMetadataQueryVariables>;
 export const NewsDocument = {"kind":"Document","definitions":[{"kind":"OperationDefinition","operation":"query","name":{"kind":"Name","value":"news"},"selectionSet":{"kind":"SelectionSet","selections":[{"kind":"Field","alias":{"kind":"Name","value":"index"},"name":{"kind":"Name","value":"newsIndex"},"selectionSet":{"kind":"SelectionSet","selections":[{"kind":"InlineFragment","typeCondition":{"kind":"NamedType","name":{"kind":"Name","value":"NewsIndex"}},"selectionSet":{"kind":"SelectionSet","selections":[{"kind":"FragmentSpread","name":{"kind":"Name","value":"NewsIndex"}}]}}]}},{"kind":"Field","alias":{"kind":"Name","value":"news"},"name":{"kind":"Name","value":"pages"},"arguments":[{"kind":"Argument","name":{"kind":"Name","value":"contentType"},"value":{"kind":"StringValue","value":"news.NewsPage","block":false}},{"kind":"Argument","name":{"kind":"Name","value":"order"},"value":{"kind":"StringValue","value":"-first_published_at","block":false}},{"kind":"Argument","name":{"kind":"Name","value":"limit"},"value":{"kind":"IntValue","value":"1000"}}],"selectionSet":{"kind":"SelectionSet","selections":[{"kind":"InlineFragment","typeCondition":{"kind":"NamedType","name":{"kind":"Name","value":"NewsPage"}},"selectionSet":{"kind":"SelectionSet","selections":[{"kind":"FragmentSpread","name":{"kind":"Name","value":"NewsListItem"}}]}}]}}]}},{"kind":"FragmentDefinition","name":{"kind":"Name","value":"Image"},"typeCondition":{"kind":"NamedType","name":{"kind":"Name","value":"CustomImage"}},"selectionSet":{"kind":"SelectionSet","selections":[{"kind":"Field","name":{"kind":"Name","value":"id"}},{"kind":"Field","name":{"kind":"Name","value":"url"}},{"kind":"Field","name":{"kind":"Name","value":"width"}},{"kind":"Field","name":{"kind":"Name","value":"height"}},{"kind":"Field","name":{"kind":"Name","value":"alt"}},{"kind":"Field","name":{"kind":"Name","value":"attribution"}}]}},{"kind":"FragmentDefinition","name":{"kind":"Name","value":"NewsIndex"},"typeCondition":{"kind":"NamedType","name":{"kind":"Name","value":"NewsIndex"}},"selectionSet":{"kind":"SelectionSet","selections":[{"kind":"Field","name":{"kind":"Name","value":"__typename"}},{"kind":"Field","name":{"kind":"Name","value":"id"}},{"kind":"Field","name":{"kind":"Name","value":"slug"}},{"kind":"Field","name":{"kind":"Name","value":"seoTitle"}},{"kind":"Field","name":{"kind":"Name","value":"searchDescription"}},{"kind":"Field","name":{"kind":"Name","value":"title"}},{"kind":"Field","name":{"kind":"Name","value":"lead"}}]}},{"kind":"FragmentDefinition","name":{"kind":"Name","value":"NewsListItem"},"typeCondition":{"kind":"NamedType","name":{"kind":"Name","value":"NewsPage"}},"selectionSet":{"kind":"SelectionSet","selections":[{"kind":"Field","name":{"kind":"Name","value":"__typename"}},{"kind":"Field","name":{"kind":"Name","value":"id"}},{"kind":"Field","name":{"kind":"Name","value":"slug"}},{"kind":"Field","name":{"kind":"Name","value":"title"}},{"kind":"Field","name":{"kind":"Name","value":"firstPublishedAt"}},{"kind":"Field","name":{"kind":"Name","value":"excerpt"}},{"kind":"Field","name":{"kind":"Name","value":"featuredImage"},"selectionSet":{"kind":"SelectionSet","selections":[{"kind":"FragmentSpread","name":{"kind":"Name","value":"Image"}}]}}]}}]} as unknown as DocumentNode<NewsQuery, NewsQueryVariables>;
-export const OpeningHoursSetsDocument = {"kind":"Document","definitions":[{"kind":"OperationDefinition","operation":"query","name":{"kind":"Name","value":"openingHoursSets"},"selectionSet":{"kind":"SelectionSet","selections":[{"kind":"Field","name":{"kind":"Name","value":"openingHoursSets"},"selectionSet":{"kind":"SelectionSet","selections":[{"kind":"FragmentSpread","name":{"kind":"Name","value":"OpeningHoursSet"}}]}}]}},{"kind":"FragmentDefinition","name":{"kind":"Name","value":"OpeningHoursRangeBlock"},"typeCondition":{"kind":"NamedType","name":{"kind":"Name","value":"OpeningHoursRangeBlock"}},"selectionSet":{"kind":"SelectionSet","selections":[{"kind":"Field","name":{"kind":"Name","value":"timeFrom"}},{"kind":"Field","name":{"kind":"Name","value":"timeTo"}},{"kind":"Field","name":{"kind":"Name","value":"custom"}}]}},{"kind":"FragmentDefinition","name":{"kind":"Name","value":"OpeningHoursWeekBlock"},"typeCondition":{"kind":"NamedType","name":{"kind":"Name","value":"OpeningHoursWeekBlock"}},"selectionSet":{"kind":"SelectionSet","selections":[{"kind":"Field","name":{"kind":"Name","value":"monday"},"selectionSet":{"kind":"SelectionSet","selections":[{"kind":"InlineFragment","typeCondition":{"kind":"NamedType","name":{"kind":"Name","value":"OpeningHoursRangeBlock"}},"selectionSet":{"kind":"SelectionSet","selections":[{"kind":"FragmentSpread","name":{"kind":"Name","value":"OpeningHoursRangeBlock"}}]}}]}},{"kind":"Field","name":{"kind":"Name","value":"tuesday"},"selectionSet":{"kind":"SelectionSet","selections":[{"kind":"InlineFragment","typeCondition":{"kind":"NamedType","name":{"kind":"Name","value":"OpeningHoursRangeBlock"}},"selectionSet":{"kind":"SelectionSet","selections":[{"kind":"FragmentSpread","name":{"kind":"Name","value":"OpeningHoursRangeBlock"}}]}}]}},{"kind":"Field","name":{"kind":"Name","value":"wednesday"},"selectionSet":{"kind":"SelectionSet","selections":[{"kind":"InlineFragment","typeCondition":{"kind":"NamedType","name":{"kind":"Name","value":"OpeningHoursRangeBlock"}},"selectionSet":{"kind":"SelectionSet","selections":[{"kind":"FragmentSpread","name":{"kind":"Name","value":"OpeningHoursRangeBlock"}}]}}]}},{"kind":"Field","name":{"kind":"Name","value":"thursday"},"selectionSet":{"kind":"SelectionSet","selections":[{"kind":"InlineFragment","typeCondition":{"kind":"NamedType","name":{"kind":"Name","value":"OpeningHoursRangeBlock"}},"selectionSet":{"kind":"SelectionSet","selections":[{"kind":"FragmentSpread","name":{"kind":"Name","value":"OpeningHoursRangeBlock"}}]}}]}},{"kind":"Field","name":{"kind":"Name","value":"friday"},"selectionSet":{"kind":"SelectionSet","selections":[{"kind":"InlineFragment","typeCondition":{"kind":"NamedType","name":{"kind":"Name","value":"OpeningHoursRangeBlock"}},"selectionSet":{"kind":"SelectionSet","selections":[{"kind":"FragmentSpread","name":{"kind":"Name","value":"OpeningHoursRangeBlock"}}]}}]}},{"kind":"Field","name":{"kind":"Name","value":"saturday"},"selectionSet":{"kind":"SelectionSet","selections":[{"kind":"InlineFragment","typeCondition":{"kind":"NamedType","name":{"kind":"Name","value":"OpeningHoursRangeBlock"}},"selectionSet":{"kind":"SelectionSet","selections":[{"kind":"FragmentSpread","name":{"kind":"Name","value":"OpeningHoursRangeBlock"}}]}}]}},{"kind":"Field","name":{"kind":"Name","value":"sunday"},"selectionSet":{"kind":"SelectionSet","selections":[{"kind":"InlineFragment","typeCondition":{"kind":"NamedType","name":{"kind":"Name","value":"OpeningHoursRangeBlock"}},"selectionSet":{"kind":"SelectionSet","selections":[{"kind":"FragmentSpread","name":{"kind":"Name","value":"OpeningHoursRangeBlock"}}]}}]}}]}},{"kind":"FragmentDefinition","name":{"kind":"Name","value":"OpeningHoursSet"},"typeCondition":{"kind":"NamedType","name":{"kind":"Name","value":"OpeningHoursSet"}},"selectionSet":{"kind":"SelectionSet","selections":[{"kind":"Field","name":{"kind":"Name","value":"name"}},{"kind":"Field","name":{"kind":"Name","value":"effectiveFrom"}},{"kind":"Field","name":{"kind":"Name","value":"effectiveTo"}},{"kind":"Field","name":{"kind":"Name","value":"announcement"}},{"kind":"Field","name":{"kind":"Name","value":"items"},"selectionSet":{"kind":"SelectionSet","selections":[{"kind":"Field","name":{"kind":"Name","value":"id"}},{"kind":"Field","name":{"kind":"Name","value":"function"}},{"kind":"Field","name":{"kind":"Name","value":"week"},"selectionSet":{"kind":"SelectionSet","selections":[{"kind":"Field","name":{"kind":"Name","value":"__typename"}},{"kind":"InlineFragment","typeCondition":{"kind":"NamedType","name":{"kind":"Name","value":"OpeningHoursWeekBlock"}},"selectionSet":{"kind":"SelectionSet","selections":[{"kind":"FragmentSpread","name":{"kind":"Name","value":"OpeningHoursWeekBlock"}}]}}]}}]}}]}}]} as unknown as DocumentNode<OpeningHoursSetsQuery, OpeningHoursSetsQueryVariables>;
+export const OpeningHoursSetsDocument = {"kind":"Document","definitions":[{"kind":"OperationDefinition","operation":"query","name":{"kind":"Name","value":"openingHoursSets"},"selectionSet":{"kind":"SelectionSet","selections":[{"kind":"Field","name":{"kind":"Name","value":"openingHoursSets"},"selectionSet":{"kind":"SelectionSet","selections":[{"kind":"FragmentSpread","name":{"kind":"Name","value":"OpeningHoursSet"}}]}}]}},{"kind":"FragmentDefinition","name":{"kind":"Name","value":"OpeningHoursRangeBlock"},"typeCondition":{"kind":"NamedType","name":{"kind":"Name","value":"OpeningHoursRangeBlock"}},"selectionSet":{"kind":"SelectionSet","selections":[{"kind":"Field","name":{"kind":"Name","value":"timeFrom"}},{"kind":"Field","name":{"kind":"Name","value":"timeTo"}},{"kind":"Field","name":{"kind":"Name","value":"custom"}}]}},{"kind":"FragmentDefinition","name":{"kind":"Name","value":"OpeningHoursWeekBlock"},"typeCondition":{"kind":"NamedType","name":{"kind":"Name","value":"OpeningHoursWeekBlock"}},"selectionSet":{"kind":"SelectionSet","selections":[{"kind":"Field","name":{"kind":"Name","value":"monday"},"selectionSet":{"kind":"SelectionSet","selections":[{"kind":"InlineFragment","typeCondition":{"kind":"NamedType","name":{"kind":"Name","value":"OpeningHoursRangeBlock"}},"selectionSet":{"kind":"SelectionSet","selections":[{"kind":"FragmentSpread","name":{"kind":"Name","value":"OpeningHoursRangeBlock"}}]}}]}},{"kind":"Field","name":{"kind":"Name","value":"tuesday"},"selectionSet":{"kind":"SelectionSet","selections":[{"kind":"InlineFragment","typeCondition":{"kind":"NamedType","name":{"kind":"Name","value":"OpeningHoursRangeBlock"}},"selectionSet":{"kind":"SelectionSet","selections":[{"kind":"FragmentSpread","name":{"kind":"Name","value":"OpeningHoursRangeBlock"}}]}}]}},{"kind":"Field","name":{"kind":"Name","value":"wednesday"},"selectionSet":{"kind":"SelectionSet","selections":[{"kind":"InlineFragment","typeCondition":{"kind":"NamedType","name":{"kind":"Name","value":"OpeningHoursRangeBlock"}},"selectionSet":{"kind":"SelectionSet","selections":[{"kind":"FragmentSpread","name":{"kind":"Name","value":"OpeningHoursRangeBlock"}}]}}]}},{"kind":"Field","name":{"kind":"Name","value":"thursday"},"selectionSet":{"kind":"SelectionSet","selections":[{"kind":"InlineFragment","typeCondition":{"kind":"NamedType","name":{"kind":"Name","value":"OpeningHoursRangeBlock"}},"selectionSet":{"kind":"SelectionSet","selections":[{"kind":"FragmentSpread","name":{"kind":"Name","value":"OpeningHoursRangeBlock"}}]}}]}},{"kind":"Field","name":{"kind":"Name","value":"friday"},"selectionSet":{"kind":"SelectionSet","selections":[{"kind":"InlineFragment","typeCondition":{"kind":"NamedType","name":{"kind":"Name","value":"OpeningHoursRangeBlock"}},"selectionSet":{"kind":"SelectionSet","selections":[{"kind":"FragmentSpread","name":{"kind":"Name","value":"OpeningHoursRangeBlock"}}]}}]}},{"kind":"Field","name":{"kind":"Name","value":"saturday"},"selectionSet":{"kind":"SelectionSet","selections":[{"kind":"InlineFragment","typeCondition":{"kind":"NamedType","name":{"kind":"Name","value":"OpeningHoursRangeBlock"}},"selectionSet":{"kind":"SelectionSet","selections":[{"kind":"FragmentSpread","name":{"kind":"Name","value":"OpeningHoursRangeBlock"}}]}}]}},{"kind":"Field","name":{"kind":"Name","value":"sunday"},"selectionSet":{"kind":"SelectionSet","selections":[{"kind":"InlineFragment","typeCondition":{"kind":"NamedType","name":{"kind":"Name","value":"OpeningHoursRangeBlock"}},"selectionSet":{"kind":"SelectionSet","selections":[{"kind":"FragmentSpread","name":{"kind":"Name","value":"OpeningHoursRangeBlock"}}]}}]}}]}},{"kind":"FragmentDefinition","name":{"kind":"Name","value":"OpeningHoursSet"},"typeCondition":{"kind":"NamedType","name":{"kind":"Name","value":"OpeningHoursSet"}},"selectionSet":{"kind":"SelectionSet","selections":[{"kind":"Field","name":{"kind":"Name","value":"name"}},{"kind":"Field","name":{"kind":"Name","value":"effectiveFrom"}},{"kind":"Field","name":{"kind":"Name","value":"effectiveTo"}},{"kind":"Field","name":{"kind":"Name","value":"announcement"}},{"kind":"Field","name":{"kind":"Name","value":"items"},"selectionSet":{"kind":"SelectionSet","selections":[{"kind":"Field","name":{"kind":"Name","value":"id"}},{"kind":"Field","name":{"kind":"Name","value":"function"}},{"kind":"Field","name":{"kind":"Name","value":"week"},"selectionSet":{"kind":"SelectionSet","selections":[{"kind":"Field","name":{"kind":"Name","value":"__typename"}},{"kind":"InlineFragment","typeCondition":{"kind":"NamedType","name":{"kind":"Name","value":"OpeningHoursWeekBlock"}},"selectionSet":{"kind":"SelectionSet","selections":[{"kind":"FragmentSpread","name":{"kind":"Name","value":"OpeningHoursWeekBlock"}}]}}]}}]}}]}}]} as unknown as DocumentNode<OpeningHoursSetsQuery, OpeningHoursSetsQueryVariables>;
+export const LatestPageSlugDocument = {"kind":"Document","definitions":[{"kind":"OperationDefinition","operation":"query","name":{"kind":"Name","value":"latestPageSlug"},"variableDefinitions":[{"kind":"VariableDefinition","variable":{"kind":"Variable","name":{"kind":"Name","value":"contentType"}},"type":{"kind":"NonNullType","type":{"kind":"NamedType","name":{"kind":"Name","value":"String"}}}}],"selectionSet":{"kind":"SelectionSet","selections":[{"kind":"Field","name":{"kind":"Name","value":"pages"},"arguments":[{"kind":"Argument","name":{"kind":"Name","value":"contentType"},"value":{"kind":"Variable","name":{"kind":"Name","value":"contentType"}}},{"kind":"Argument","name":{"kind":"Name","value":"order"},"value":{"kind":"StringValue","value":"-first_published_at","block":false}},{"kind":"Argument","name":{"kind":"Name","value":"limit"},"value":{"kind":"IntValue","value":"1"}}],"selectionSet":{"kind":"SelectionSet","selections":[{"kind":"Field","name":{"kind":"Name","value":"id"}},{"kind":"Field","name":{"kind":"Name","value":"slug"}}]}}]}}]} as unknown as DocumentNode<LatestPageSlugQuery, LatestPageSlugQueryVariables>;

web/src/instrumentation.test.ts

@@ -0,0 +1,162 @@
+import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
+
+import { internalRevalidateSecret } from "@/lib/internalRevalidate";
+import { register } from "./instrumentation.ts";
+
+const fetchMock = vi.fn();
+
+const purgedTags = () =>
+  fetchMock.mock.calls.map(([url]) => new URL(String(url)).searchParams.get("tag"));
+
+beforeEach(() => {
+  vi.useFakeTimers();
+  // 23:59:50 in Oslo (CEST)
+  vi.setSystemTime(new Date("2026-07-07T21:59:50Z"));
+  vi.stubGlobal("fetch", fetchMock);
+  fetchMock.mockResolvedValue({ ok: true, status: 200 });
+  vi.stubEnv("NEXT_RUNTIME", "nodejs");
+  vi.stubEnv("NODE_ENV", "production");
+  vi.stubEnv("PORT", "4321");
+  vi.stubEnv("HOSTNAME", "0.0.0.0");
+  vi.spyOn(console, "error").mockImplementation(() => {});
+});
+
+afterEach(() => {
+  vi.useRealTimers();
+  vi.unstubAllEnvs();
+  vi.unstubAllGlobals();
+  vi.restoreAllMocks();
+  fetchMock.mockReset();
+});
+
+// register() and let the startup purge go through
+async function start() {
+  register();
+  await vi.advanceTimersByTimeAsync(0);
+  fetchMock.mockClear();
+}
+
+describe("at startup", () => {
+  it("purges both tags", async () => {
+    register();
+    await vi.advanceTimersByTimeAsync(0);
+
+    expect(purgedTags()).toEqual(["cms", "today"]);
+    const [url, init] = fetchMock.mock.calls[0];
+    expect(String(url)).toBe("http://127.0.0.1:4321/api/revalidate?tag=cms");
+    expect(init.method).toBe("POST");
+    // authenticated with the secret the route accepts for internal calls
+    expect(init.headers["x-revalidate-secret"]).toBe(internalRevalidateSecret());
+    expect(internalRevalidateSecret()).toBeTruthy();
+  });
+
+  it("keeps trying until the server is listening", async () => {
+    fetchMock
+      .mockRejectedValueOnce(new Error("ECONNREFUSED"))
+      .mockRejectedValueOnce(new Error("ECONNREFUSED"));
+
+    register();
+    await vi.advanceTimersByTimeAsync(2_500);
+
+    expect(purgedTags()).toEqual(["cms", "cms", "cms", "today"]);
+    // expected while the server starts: not worth an error in the log
+    expect(console.error).not.toHaveBeenCalled();
+  });
+
+  it("starts over when only the first of the two purges went through", async () => {
+    fetchMock
+      .mockResolvedValueOnce({ ok: true, status: 200 })
+      .mockResolvedValueOnce({ ok: false, status: 503 });
+
+    register();
+    await vi.advanceTimersByTimeAsync(1_500);
+
+    expect(purgedTags()).toEqual(["cms", "today", "cms", "today"]);
+  });
+
+  it.each([
+    ["an IPv4 address", "10.0.0.5", "http://10.0.0.5:4321"],
+    ["an IPv6 address", "::1", "http://[::1]:4321"],
+    ["the IPv6 wildcard", "::", "http://127.0.0.1:4321"],
+    ["nothing", "", "http://127.0.0.1:4321"],
+  ])("reaches a server bound to %s", async (_what, hostname, origin) => {
+    vi.stubEnv("HOSTNAME", hostname);
+
+    register();
+    await vi.advanceTimersByTimeAsync(0);
+
+    expect(String(fetchMock.mock.calls[0][0])).toBe(
+      `${origin}/api/revalidate?tag=cms`
+    );
+  });
+});
+
+describe("at Oslo midnight", () => {
+  it("purges the today tag one second past, and once more after that", async () => {
+    await start();
+
+    // 23:59:59: not yet
+    await vi.advanceTimersByTimeAsync(9_000);
+    expect(purgedTags()).toEqual([]);
+
+    // 00:00:01
+    await vi.advanceTimersByTimeAsync(2_000);
+    expect(purgedTags()).toEqual(["today"]);
+
+    // a page rendered across the first purge would have survived it
+    await vi.advanceTimersByTimeAsync(30_000);
+    expect(purgedTags()).toEqual(["today", "today"]);
+
+    // then nothing for the rest of the day
+    await vi.advanceTimersByTimeAsync(23 * 3600 * 1000);
+    expect(purgedTags()).toEqual(["today", "today"]);
+  });
+
+  it("does so every night", async () => {
+    await start();
+
+    await vi.advanceTimersByTimeAsync(3 * 24 * 3600 * 1000);
+
+    expect(purgedTags()).toEqual(Array(6).fill("today"));
+  });
+
+  it("catches up when timers stood still over midnight", async () => {
+    await start();
+
+    // a paused host: the clock moves on, the pending timer does not fire
+    vi.setSystemTime(new Date("2026-07-07T22:10:00Z")); // 00:10 in Oslo
+    expect(purgedTags()).toEqual([]);
+
+    // the next regular check notices the new day
+    await vi.advanceTimersByTimeAsync(30_000);
+    expect(purgedTags()).toEqual(["today"]);
+  });
+
+  it("retries a failed purge at the next check, and says so", async () => {
+    await start();
+    fetchMock.mockResolvedValueOnce({ ok: false, status: 503 });
+
+    await vi.advanceTimersByTimeAsync(11_000); // 00:00:01, fails
+    expect(purgedTags()).toEqual(["today"]);
+    expect(console.error).toHaveBeenCalledTimes(1);
+
+    await vi.advanceTimersByTimeAsync(30_000); // succeeds
+    await vi.advanceTimersByTimeAsync(30_000); // the follow-up purge
+    expect(purgedTags()).toEqual(["today", "today", "today"]);
+  });
+});
+
+describe("register", () => {
+  it.each([
+    ["during next build", { NEXT_PHASE: "phase-production-build" }],
+    ["in next dev", { NODE_ENV: "development" }],
+    ["on the edge runtime", { NEXT_RUNTIME: "edge" }],
+  ])("does nothing %s", async (_when, env) => {
+    for (const [key, value] of Object.entries(env)) vi.stubEnv(key, value);
+
+    register();
+    await vi.advanceTimersByTimeAsync(48 * 3600 * 1000);
+
+    expect(fetchMock).not.toHaveBeenCalled();
+  });
+});

web/src/instrumentation.ts

@@ -0,0 +1,88 @@
+import { osloDay } from "@/lib/date";
+import {
+  purgeOwnCache,
+  setInternalRevalidateSecret,
+} from "@/lib/internalRevalidate";
+import {
+  CMS_CACHE_TAG,
+  TODAY_CACHE_TAG,
+  secondsUntilOsloMidnight,
+} from "@/lib/revalidation";
+
+// How often the clock is checked. Timers alone can't be trusted to fire at
+// midnight: they stand still while a host or VM is paused
+const CHECK_INTERVAL_MS = 30_000;
+// Until the first purge has gone through; the server isn't listening yet
+// when register() runs
+const STARTUP_RETRY_MS = 1_000;
+
+function keepCacheCurrent() {
+  // the Oslo day the cache was last purged for; undefined until the startup
+  // purge has gone through
+  let purgedDay: string | undefined;
+  let repeatTodayPurge = false;
+  let failures = 0;
+
+  async function check() {
+    const day = osloDay();
+    let error: string | null = null;
+
+    if (purgedDay === undefined) {
+      // Pages prerendered by the build, or left on disk by an earlier run,
+      // may predate CMS edits and midnights this process never saw
+      error =
+        (await purgeOwnCache(CMS_CACHE_TAG)) ??
+        (await purgeOwnCache(TODAY_CACHE_TAG));
+      if (!error) purgedDay = day;
+    } else if (day !== purgedDay) {
+      error = await purgeOwnCache(TODAY_CACHE_TAG);
+      if (!error) {
+        purgedDay = day;
+        repeatTodayPurge = true;
+      }
+    } else if (repeatTodayPurge) {
+      // Next stamps a page when its render finishes, so a page that was
+      // being rendered across the purge looks newer than it and survives.
+      // A second purge one interval later catches those
+      error = await purgeOwnCache(TODAY_CACHE_TAG);
+      if (!error) repeatTodayPurge = false;
+    }
+
+    if (error) {
+      failures += 1;
+      // at startup, connection errors are expected for the first moments
+      if (failures === 1 ? purgedDay !== undefined : failures % 60 === 0) {
+        console.error(`Purging the page cache keeps failing: ${error}`);
+      }
+    } else {
+      failures = 0;
+    }
+    schedule();
+  }
+
+  function schedule() {
+    const delay =
+      purgedDay === undefined
+        ? STARTUP_RETRY_MS
+        : // one second past midnight, so the purge can't land on the old day
+          Math.min(CHECK_INTERVAL_MS, (secondsUntilOsloMidnight() + 1) * 1000);
+    setTimeout(check, delay).unref();
+  }
+
+  void check();
+}
+
+export function register() {
+  // only in the running production server: not during `next build`, in
+  // `next dev` (nothing is kept between requests there) or on the edge
+  if (
+    process.env.NEXT_RUNTIME !== "nodejs" ||
+    process.env.NODE_ENV !== "production" ||
+    process.env.NEXT_PHASE === "phase-production-build"
+  ) {
+    return;
+  }
+
+  setInternalRevalidateSecret(crypto.randomUUID());
+  keepCacheCurrent();
+}

web/src/lib/cmsCache.test.ts

@@ -0,0 +1,39 @@
+import { readdirSync, readFileSync } from "node:fs";
+import { join } from "node:path";
+import { fileURLToPath } from "node:url";
+import { describe, expect, it } from "vitest";
+
+const SRC = fileURLToPath(new URL("..", import.meta.url));
+
+function sourceFiles(dir: string): string[] {
+  return readdirSync(dir, { withFileTypes: true }).flatMap((entry) => {
+    const path = join(dir, entry.name);
+    if (entry.isDirectory()) return entry.name === "gql" ? [] : sourceFiles(path);
+    return /\.tsx?$/.test(entry.name) && !/\.test\.tsx?$/.test(entry.name)
+      ? [path]
+      : [];
+  });
+}
+
+describe("use cache scopes", () => {
+  // A scope without one of the helpers falls back to Next's default lifetime
+  // and carries no tag, so the CMS webhook can't purge it
+  it("all call one of the cmsCache helpers right after the directive", () => {
+    const directive = /^\s*["']use cache["'];?\s*$/;
+    const offenders: string[] = [];
+    let scopes = 0;
+    for (const file of sourceFiles(SRC)) {
+      const lines = readFileSync(file, "utf8").split("\n");
+      lines.forEach((line, i) => {
+        if (!directive.test(line)) return;
+        scopes += 1;
+        if (!/^\s*(cmsCache|cmsCacheForToday|todayCache)\(\);\s*$/.test(lines[i + 1] ?? "")) {
+          offenders.push(`${file.slice(SRC.length)}:${i + 1}`);
+        }
+      });
+    }
+    expect(offenders).toEqual([]);
+    // the scan itself must keep finding the scopes
+    expect(scopes).toBeGreaterThan(0);
+  });
+});

web/src/lib/cmsCache.ts

@@ -0,0 +1,32 @@
+import "server-only";
+
+import { cacheLife, cacheTag } from "next/cache";
+
+import {
+  CMS_CACHE_LIFE,
+  CMS_CACHE_TAG,
+  TODAY_CACHE_TAG,
+} from "@/lib/revalidation";
+
+// Every "use cache" scope starts with one of these. A scope without a tag
+// could never be purged
+
+// For content that only changes when it is edited in the CMS
+export function cmsCache() {
+  cacheTag(CMS_CACHE_TAG);
+  cacheLife(CMS_CACHE_LIFE);
+}
+
+// For CMS content that depends on what day it is: also purged at Oslo
+// midnight
+export function cmsCacheForToday() {
+  cacheTag(CMS_CACHE_TAG, TODAY_CACHE_TAG);
+  cacheLife(CMS_CACHE_LIFE);
+}
+
+// For the current day itself. Not tagged as CMS content: an edit in the CMS
+// must not restart the lifetime that heals a missed midnight purge
+export function todayCache() {
+  cacheTag(TODAY_CACHE_TAG);
+  cacheLife(CMS_CACHE_LIFE);
+}

web/src/lib/common.test.ts

@@ -5,7 +5,7 @@ import {
   formatNorwegianPhoneNumber,
   formatPhoneE164,
   getSearchPath,
-  randomElement,
+  seededElement,
   stripHtml,
   stripWhitespace,
   unique,
@@ -22,11 +22,25 @@ describe("getSearchPath", () => {
   });
 });
 
-describe("randomElement", () => {
+describe("seededElement", () => {
   it("picks a member, undefined for empty", () => {
-    expect(randomElement([])).toBeUndefined();
-    expect(randomElement(["a"])).toBe("a");
-    expect([1, 2, 3]).toContain(randomElement([1, 2, 3]));
+    expect(seededElement([], "x")).toBeUndefined();
+    expect(seededElement(["a"], "x")).toBe("a");
+    expect([1, 2, 3]).toContain(seededElement([1, 2, 3], "x"));
+  });
+
+  it("picks the same member for the same seed", () => {
+    const picks = new Set(
+      Array.from({ length: 20 }, () => seededElement([1, 2, 3, 4, 5], "event-42"))
+    );
+    expect(picks.size).toBe(1);
+  });
+
+  it("spreads different seeds over the members", () => {
+    const picks = new Set(
+      Array.from({ length: 50 }, (_, i) => seededElement([1, 2, 3], `event-${i}`))
+    );
+    expect(picks.size).toBe(3);
   });
 });
 

web/src/lib/common.ts

@@ -37,10 +37,15 @@ export function getSearchPath(query: string): string {
   return `/sok?${params.toString()}`;
 }
 
-export function randomElement(array: any[]): any | undefined {
-  return array.length
-    ? array[Math.floor(Math.random() * array.length)]
-    : undefined;
+// Picks the same element for the same seed every time. Rendering code can't
+// use Math.random(): prerendering rejects it, and the pick would change
+// between the server render and the next regeneration
+export function seededElement<T>(array: T[], seed: string): T | undefined {
+  let hash = 0;
+  for (let i = 0; i < seed.length; i++) {
+    hash = (hash * 31 + seed.charCodeAt(i)) >>> 0;
+  }
+  return array.length ? array[hash % array.length] : undefined;
 }
 
 export function unique<T>(array: any[]): any[] {

web/src/lib/date.test.ts

@@ -10,7 +10,8 @@ import {
   groupConsecutiveDates,
   isConsecutiveDays,
   isTodayOrFuture,
-  startOfTodayInOslo,
+  osloDay,
+  startOfOsloDay,
   toLocalTime,
 } from "./date.ts";
 
@@ -24,6 +25,9 @@ afterEach(() => {
   vi.useRealTimers();
 });
 
+// what getToday()/useToday() hand to the helpers
+const today = () => startOfOsloDay(osloDay());
+
 describe("toLocalTime", () => {
   it("converts UTC to Oslo wall clock", () => {
     expect(toLocalTime("2026-07-07T18:00:00Z").getHours()).toBe(20);
@@ -31,15 +35,16 @@ describe("toLocalTime", () => {
   });
 });
 
-describe("startOfTodayInOslo", () => {
+describe("osloDay + startOfOsloDay", () => {
   it("returns the Oslo date even when the server runs in UTC", () => {
     const tz = process.env.TZ;
     process.env.TZ = "UTC";
     try {
       vi.setSystemTime(new Date("2026-07-07T22:20:00Z"));
-      const today = startOfTodayInOslo();
-      expect(today.getDate()).toBe(8);
-      expect(today.getHours()).toBe(0);
+      expect(osloDay()).toBe("2026-07-08");
+      const start = startOfOsloDay(osloDay());
+      expect(start.getDate()).toBe(8);
+      expect(start.getHours()).toBe(0);
     } finally {
       process.env.TZ = tz;
     }
@@ -57,42 +62,42 @@ describe("formatDate", () => {
 
 describe("formatYearMonth", () => {
   it("omits year for the current year", () => {
-    expect(formatYearMonth("2026-07")).toBe("juli");
+    expect(formatYearMonth("2026-07", today())).toBe("juli");
   });
 
   it("includes year for other years", () => {
-    expect(formatYearMonth("2025-11")).toBe("november 2025");
+    expect(formatYearMonth("2025-11", today())).toBe("november 2025");
   });
 });
 
 describe("formatExtendedDateTime", () => {
   it("omits year in the current year", () => {
-    expect(formatExtendedDateTime("2026-07-07T18:00:00Z")).toBe(
+    expect(formatExtendedDateTime("2026-07-07T18:00:00Z", today())).toBe(
       "tirsdag 7. juli kl. 20:00"
     );
   });
 
   it("includes year for other years", () => {
-    expect(formatExtendedDateTime("2025-11-01T12:00:00Z")).toBe(
+    expect(formatExtendedDateTime("2025-11-01T12:00:00Z", today())).toBe(
       "lørdag 1. november 2025 kl. 13:00"
     );
   });
 
   it("supports dateOnly and alwaysIncludeYear", () => {
-    expect(formatExtendedDateTime("2026-07-07T18:00:00Z", true)).toBe(
+    expect(formatExtendedDateTime("2026-07-07T18:00:00Z", today(), true)).toBe(
       "tirsdag 7. juli"
     );
-    expect(formatExtendedDateTime("2026-07-07T18:00:00Z", false, true)).toBe(
+    expect(formatExtendedDateTime("2026-07-07T18:00:00Z", today(), false, true)).toBe(
       "tirsdag 7. juli 2026 kl. 20:00"
     );
   });
 
   it("uses the correct UTC offset around the DST fall-back", () => {
     // DST ends 01:00Z on 2026-10-25: before it Oslo is UTC+2, after UTC+1
-    expect(formatExtendedDateTime("2026-10-24T23:30:00Z")).toBe(
+    expect(formatExtendedDateTime("2026-10-24T23:30:00Z", today())).toBe(
       "søndag 25. oktober kl. 01:30"
     );
-    expect(formatExtendedDateTime("2026-10-25T01:30:00Z")).toBe(
+    expect(formatExtendedDateTime("2026-10-25T01:30:00Z", today())).toBe(
       "søndag 25. oktober kl. 02:30"
     );
   });
@@ -100,14 +105,14 @@ describe("formatExtendedDateTime", () => {
 
 describe("isTodayOrFuture", () => {
   it("is false for yesterday, true for today and later", () => {
-    expect(isTodayOrFuture("2026-07-06T10:00:00Z")).toBe(false);
-    expect(isTodayOrFuture("2026-07-07T20:00:00Z")).toBe(true);
-    expect(isTodayOrFuture("2026-08-01T00:00:00Z")).toBe(true);
+    expect(isTodayOrFuture("2026-07-06T10:00:00Z", today())).toBe(false);
+    expect(isTodayOrFuture("2026-07-07T20:00:00Z", today())).toBe(true);
+    expect(isTodayOrFuture("2026-08-01T00:00:00Z", today())).toBe(true);
   });
 
   it("judges the day by Oslo wall clock, not UTC", () => {
     // 22:30Z on the 6th is 00:30 on the 7th ("today") in Oslo
-    expect(isTodayOrFuture("2026-07-06T22:30:00Z")).toBe(true);
+    expect(isTodayOrFuture("2026-07-06T22:30:00Z", today())).toBe(true);
   });
 });
 

web/src/lib/date.ts

@@ -1,6 +1,5 @@
 import {
-  isToday,
-  isAfter,
+  isBefore,
   parse,
   compareAsc,
   addDays,
@@ -8,7 +7,7 @@ import {
   startOfDay,
 } from "date-fns";
 import { nb } from "date-fns/locale";
-import { toZonedTime, format } from "date-fns-tz";
+import { toZonedTime, format, formatInTimeZone } from "date-fns-tz";
 import { unique } from "./common";
 
 const timeZone = "Europe/Oslo";
@@ -20,19 +19,26 @@ export function toLocalTime(date: Date | string | number) {
   return toZonedTime(date, timeZone);
 }
 
-// Start of the current Oslo day, regardless of the server's TZ
-export function startOfTodayInOslo() {
-  return startOfDay(toLocalTime(new Date()));
+// The Oslo calendar day ("yyyy-MM-dd") at the given instant, regardless of
+// the server's TZ. Rendering code must not call this without a cache scope:
+// get the day from getToday() or useToday() instead
+export function osloDay(now: Date = new Date()): string {
+  return formatInTimeZone(now, timeZone, "yyyy-MM-dd");
+}
+
+// Start of an Oslo day, comparable with toLocalTime() values
+export function startOfOsloDay(day: string): Date {
+  return parse(day, "yyyy-MM-dd", new Date(0));
 }
 
 export function formatDate(date: Date | string | number, formatStr: string) {
   return format(toLocalTime(date), formatStr, { timeZone, locale: nb });
 }
 
-export function formatYearMonth(yearMonth: string) {
+export function formatYearMonth(yearMonth: string, today: Date) {
   // full name of month if year is current year, otherwise name of month + year
-  const parsed = parse(yearMonth, "yyyy-MM", new Date());
-  if (parsed.getFullYear() === new Date().getFullYear()) {
+  const parsed = parse(yearMonth, "yyyy-MM", new Date(0));
+  if (parsed.getFullYear() === today.getFullYear()) {
     return formatDate(parsed, "MMMM");
   }
   return formatDate(parsed, "MMMM yyyy");
@@ -40,6 +46,7 @@ export function formatYearMonth(yearMonth: string) {
 
 export function formatExtendedDateTime(
   date: Date | string | number,
+  today: Date,
   dateOnly: boolean = false,
   alwaysIncludeYear: boolean = false
 ) {
@@ -47,21 +54,15 @@ export function formatExtendedDateTime(
   // year included if not current year
   const parsed = toLocalTime(date);
   const timePart = dateOnly ? "" : " 'kl.' HH:mm";
-  const isCurrentYear = parsed.getFullYear() === new Date().getFullYear();
+  const isCurrentYear = parsed.getFullYear() === today.getFullYear();
   const yearPart = (!isCurrentYear || alwaysIncludeYear) ? " yyyy" : "";
   const formatStr = `EEEE d. MMMM${yearPart}${timePart}`;
   const formatted = format(parsed, formatStr, { timeZone, locale: nb });
   return formatted;
 }
 
-export function isTodayOrFuture(
-  date: Date | string | number,
-  timeZone = "UTC"
-) {
-  const now = new Date();
-  const zonedNow = toZonedTime(now, timeZone);
-  const zonedDate = toLocalTime(date);
-  return isToday(zonedDate) || isAfter(zonedDate, zonedNow);
+export function isTodayOrFuture(date: Date | string | number, today: Date) {
+  return !isBefore(toLocalTime(date), today);
 }
 
 export function compareDates(a: Date | string, b: Date | string) {
@@ -124,11 +125,11 @@ export function formatOccurrenceMonths(starts: string[]): string {
 
   return groups
     .map((g) => {
-      const first = parse(g[0], "yyyy-MM", new Date());
+      const first = parse(g[0], "yyyy-MM", new Date(0));
       if (g.length === 1) {
         return formatDate(first, "MMMM yyyy");
       }
-      const last = parse(g[g.length - 1], "yyyy-MM", new Date());
+      const last = parse(g[g.length - 1], "yyyy-MM", new Date(0));
       const firstFmt =
         first.getFullYear() === last.getFullYear()
           ? formatDate(first, "MMMM")

web/src/lib/event.test.ts

@@ -9,6 +9,10 @@ import {
   organizeEventsInCalendar,
   sortSingularEvents,
 } from "./event.ts";
+import { osloDay, startOfOsloDay } from "./date.ts";
+
+// what getToday()/useToday() hand to the helpers
+const today = () => startOfOsloDay(osloDay());
 
 // "now" is tirsdag 2026-07-07 12:00 in Oslo
 beforeEach(() => {
@@ -180,7 +184,7 @@ describe("getFutureOccurrences", () => {
       "2026-07-07T18:00:00Z",
     ]);
 
-    expect(getFutureOccurrences(event).map((o) => o.start)).toEqual([
+    expect(getFutureOccurrences(event, today()).map((o) => o.start)).toEqual([
       "2026-07-07T18:00:00Z",
       "2026-07-14T18:00:00Z",
     ]);
@@ -197,7 +201,7 @@ describe("getFutureOccurrences", () => {
         "2026-07-08T18:00:00Z",
       ]);
 
-      expect(getFutureOccurrences(event).map((o) => o.start)).toEqual([
+      expect(getFutureOccurrences(event, today()).map((o) => o.start)).toEqual([
         "2026-07-08T18:00:00Z",
       ]);
     } finally {

web/src/lib/event.ts

@@ -10,7 +10,6 @@ import {
   toLocalTime,
   formatDate,
   compareDates,
-  startOfTodayInOslo,
 } from "./date";
 import { graphql, unmaskFragment } from "@/gql";
 import {
@@ -20,7 +19,7 @@ import {
   type EventOrganizerFragment,
   type EventOverviewItemFragment,
 } from "@/gql/graphql";
-import { PIG_NAMES, randomElement } from "@/lib/common";
+import { PIG_NAMES, seededElement } from "@/lib/common";
 
 export type EventOccurrence = EventFragment["occurrences"][number];
 export type EventListItemOccurrence = EventListItemFragment["occurrences"][number];
@@ -353,9 +352,9 @@ export function organizeEventsByDate<E extends EventListable>(
 }
 
 export function getFutureOccurrences<E extends EventListable>(
-  event: E
+  event: E,
+  today: Date
 ): E["occurrences"][number][] {
-  const today = startOfTodayInOslo();
   const occurrences = event?.occurrences ?? [];
   const futureOccurrences = occurrences.filter((occurrence) =>
     isAfter(toLocalTime(occurrence.start), today)
@@ -381,7 +380,7 @@ export function getEventPig(event: EventFragment): string | null {
     const categoryPigs = categories
       ?.map((category) => category.pig)
       .filter((pig) => PIG_NAMES.includes(pig));
-    const chosenPig = randomElement(categoryPigs ?? []);
+    const chosenPig = seededElement(categoryPigs ?? [], String(event.id));
     return typeof chosenPig === "string" ? chosenPig : null;
   }
   return null;

web/src/lib/internalRevalidate.ts

@@ -0,0 +1,49 @@
+import type { CacheTag } from "@/lib/revalidation";
+
+// The server purges its own cache (at startup, at Oslo midnight, and as a
+// follow-up to webhooks) by calling /api/revalidate, because revalidateTag
+// only works inside a request. The secret for those calls is made up per
+// process and kept on globalThis: instrumentation.ts and the route handler
+// are bundled separately
+
+const KEY = Symbol.for("neuf.internalRevalidateSecret");
+type Store = { [KEY]?: string };
+
+export function internalRevalidateSecret(): string | undefined {
+  // an empty secret must never count as set
+  return (globalThis as Store)[KEY] || undefined;
+}
+
+export function setInternalRevalidateSecret(secret: string) {
+  (globalThis as Store)[KEY] = secret;
+}
+
+const PURGE_TIMEOUT_MS = 10_000;
+
+// The server is reached the way it listens (the standalone server binds to
+// HOSTNAME); the wildcard addresses are reachable over loopback
+function ownOrigin(): string {
+  const hostname = process.env.HOSTNAME;
+  const port = process.env.PORT || 3000;
+  if (!hostname || hostname === "0.0.0.0" || hostname === "::") {
+    return `http://127.0.0.1:${port}`;
+  }
+  return `http://${hostname.includes(":") ? `[${hostname}]` : hostname}:${port}`;
+}
+
+// Resolves to null on success, otherwise to what went wrong
+export async function purgeOwnCache(tag: CacheTag): Promise<string | null> {
+  const secret = internalRevalidateSecret();
+  if (!secret) return "no internal secret";
+  try {
+    const res = await fetch(`${ownOrigin()}/api/revalidate?tag=${tag}`, {
+      method: "POST",
+      headers: { "x-revalidate-secret": secret },
+      cache: "no-store",
+      signal: AbortSignal.timeout(PURGE_TIMEOUT_MS),
+    });
+    return res.ok ? null : `HTTP ${res.status}`;
+  } catch (error) {
+    return error instanceof Error ? error.message : String(error);
+  }
+}

web/src/lib/openinghours.test.ts

@@ -1,7 +1,7 @@
 import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
 
 // sever the server-only @/app/client import chain; the network functions are not under test
-vi.mock("@/app/client", () => ({ getClient: vi.fn() }));
+vi.mock("@/app/client", () => ({ cmsQuery: vi.fn() }));
 
 import type {
   OpeningHoursRangeBlockFragment,
@@ -13,6 +13,10 @@ import {
   getTodaysOpeningHoursForFunction,
   groupOpeningHours,
 } from "./openinghours.ts";
+import { osloDay, startOfOsloDay } from "./date.ts";
+
+// what getToday()/useToday() hand to the helpers
+const today = () => startOfOsloDay(osloDay());
 
 const range = (
   timeFrom: string | null,
@@ -138,28 +142,28 @@ describe("getTodaysOpeningHoursForFunction", () => {
 
   it("returns today's hours", () => {
     vi.setSystemTime(new Date("2026-07-07T10:00:00Z")); // tirsdag
-    expect(getTodaysOpeningHoursForFunction(openingHours, "bar")).toBe(
+    expect(getTodaysOpeningHoursForFunction(openingHours, "bar", today())).toBe(
       "16:00—23:00"
     );
   });
 
   it("returns Stengt for a null day", () => {
     vi.setSystemTime(new Date("2026-07-11T10:00:00Z")); // lørdag
-    expect(getTodaysOpeningHoursForFunction(openingHours, "bar")).toBe(
+    expect(getTodaysOpeningHoursForFunction(openingHours, "bar", today())).toBe(
       "Stengt"
     );
   });
 
   it("returns the custom text when set", () => {
     vi.setSystemTime(new Date("2026-07-12T10:00:00Z")); // søndag
-    expect(getTodaysOpeningHoursForFunction(openingHours, "bar")).toBe(
+    expect(getTodaysOpeningHoursForFunction(openingHours, "bar", today())).toBe(
       "Kun ved arrangement"
     );
   });
 
   it("returns ? for unknown functions", () => {
     vi.setSystemTime(new Date("2026-07-07T10:00:00Z"));
-    expect(getTodaysOpeningHoursForFunction(openingHours, "kafé")).toBe("?");
+    expect(getTodaysOpeningHoursForFunction(openingHours, "kafé", today())).toBe("?");
   });
 
   it("uses the Oslo weekday when the server runs in UTC", () => {
@@ -168,12 +172,12 @@ describe("getTodaysOpeningHoursForFunction", () => {
     try {
       // 22:20 UTC on torsdag is 00:20 fredag in Oslo (CEST)
       vi.setSystemTime(new Date("2026-07-09T22:20:00Z"));
-      expect(getTodaysOpeningHoursForFunction(openingHours, "bar")).toBe(
+      expect(getTodaysOpeningHoursForFunction(openingHours, "bar", today())).toBe(
         "15:00—01:00"
       );
       // 23:20 UTC on torsdag is 00:20 fredag in Oslo (CET)
       vi.setSystemTime(new Date("2026-01-08T23:20:00Z"));
-      expect(getTodaysOpeningHoursForFunction(openingHours, "bar")).toBe(
+      expect(getTodaysOpeningHoursForFunction(openingHours, "bar", today())).toBe(
         "15:00—01:00"
       );
     } finally {

web/src/lib/openinghours.ts

@@ -1,8 +1,6 @@
 import { compareDesc, getISODay, isAfter, isSameDay, parseISO } from "date-fns";
 
-import { getClient } from "@/app/client";
-import { startOfTodayInOslo } from "@/lib/date";
-import { cachedUntilOsloMidnight } from "@/lib/revalidation";
+import { cmsQuery } from "@/app/client";
 import { graphql, unmaskFragment } from "@/gql";
 import type {
   OpeningHoursRangeBlockFragment as OpeningHoursRangeBlock,
@@ -45,19 +43,17 @@ const openingHoursQuery = graphql(`
 `);
 
 export async function fetchOpeningHoursSets() {
-  const { data, error } = await getClient().query(
-    openingHoursQuery,
-    {},
-    // The footer renders today's hours on every page, so this TTL doubles as
-    // the sitewide midnight refresh for futureEvents rollover
-    cachedUntilOsloMidnight()
-  );
+  // The footer shows these on every page; a failed query must not take the
+  // whole site down with it
+  const data = await cmsQuery(openingHoursQuery, {}).catch((error) => {
+    console.error("Failed to fetch opening hours", error);
+    return undefined;
+  });
   const sets = (data?.openingHoursSets ?? []) as OpeningHoursSet[];
   return sets;
 }
 
-export async function getOpeningHours() {
-  const today = startOfTodayInOslo();
+export async function getOpeningHours(today: Date) {
   const sets = await fetchOpeningHoursSets();
   const validSets = sets
     .filter((set) => {
@@ -202,12 +198,13 @@ export function getPrettyOpeningHoursForFunction(
 export function getTodaysOpeningHoursForFunction(
   openingHours: OpeningHoursSet,
   name: string,
+  today: Date,
 ): string {
   const week: any = getOpeningHoursForFunction(openingHours, name);
   if (!week) {
     return "?";
   }
-  const weekdayIndex = getISODay(startOfTodayInOslo()) - 1;
+  const weekdayIndex = getISODay(today) - 1;
   const weekday = WEEKDAYS[weekdayIndex];
   const hours = week[weekday];
   if (hours?.timeFrom && hours?.timeTo) {

web/src/lib/revalidation.test.ts

@@ -1,9 +1,6 @@
 import { describe, expect, it } from "vitest";
 
-import {
-  cachedUntilOsloMidnight,
-  secondsUntilOsloMidnight,
-} from "./revalidation.ts";
+import { secondsUntilOsloMidnight } from "./revalidation.ts";
 
 describe("secondsUntilOsloMidnight", () => {
   it("is 12h from midnight at 12:00 CEST on a normal day", () => {
@@ -11,9 +8,14 @@ describe("secondsUntilOsloMidnight", () => {
     expect(secondsUntilOsloMidnight(now)).toBe(12 * 3600);
   });
 
-  it("clamps to 60s just before midnight", () => {
+  it("counts down to the second just before midnight", () => {
     const now = new Date("2026-07-07T21:59:30Z");
-    expect(secondsUntilOsloMidnight(now)).toBe(60);
+    expect(secondsUntilOsloMidnight(now)).toBe(30);
+  });
+
+  it("is a full day at midnight itself", () => {
+    const now = new Date("2026-07-07T22:00:00Z");
+    expect(secondsUntilOsloMidnight(now)).toBe(24 * 3600);
   });
 
   it("handles the 25h DST fall-back day (2026-10-25)", () => {
@@ -26,29 +28,3 @@ describe("secondsUntilOsloMidnight", () => {
     expect(secondsUntilOsloMidnight(now)).toBe(23 * 3600);
   });
 });
-
-describe("cachedUntilOsloMidnight", () => {
-  // urql types fetchOptions as RequestInit | () => RequestInit; we always pass an object
-  function fetchOptionsAt(now: Date): RequestInit {
-    const { fetchOptions } = cachedUntilOsloMidnight(now);
-    return typeof fetchOptions === "function" ? fetchOptions() : fetchOptions ?? {};
-  }
-
-  it("keys the fetch cache on the Oslo date, not the UTC date", () => {
-    // 00:30 CEST on Sep 5 is still Sep 4 in UTC
-    const { headers } = fetchOptionsAt(new Date("2026-09-04T22:30:00Z"));
-    expect(headers).toEqual({ "x-oslo-day": "2026-09-05" });
-  });
-
-  it("changes the cache key at Oslo midnight", () => {
-    const before = fetchOptionsAt(new Date("2026-09-04T21:59:59Z"));
-    const after = fetchOptionsAt(new Date("2026-09-04T22:00:00Z"));
-    expect(before.headers).toEqual({ "x-oslo-day": "2026-09-04" });
-    expect(after.headers).toEqual({ "x-oslo-day": "2026-09-05" });
-  });
-
-  it("revalidates at Oslo midnight and tags the entry", () => {
-    const { next } = fetchOptionsAt(new Date("2026-09-05T10:00:00Z"));
-    expect(next).toEqual({ revalidate: 12 * 3600, tags: ["cms"] });
-  });
-});

web/src/lib/revalidation.ts

@@ -1,42 +1,41 @@
 import { addDays, startOfDay } from "date-fns";
-import { formatInTimeZone, fromZonedTime, toZonedTime } from "date-fns-tz";
+import { fromZonedTime, toZonedTime } from "date-fns-tz";
 import type { OperationContext } from "@urql/core";
 
 const timeZone = "Europe/Oslo";
 
-// Global cache tag: any CMS content change purges everything
+// Everything cached is kept until one of these tags is purged through
+// /api/revalidate. Time only plays a part as a safety net, see CMS_CACHE_LIFE
+
+// On all cached CMS data. Purged by the CMS webhook on any content change
 export const CMS_CACHE_TAG = "cms";
 
-const MIN_REVALIDATE_SECONDS = 60;
+// On whatever depends on what day it is. Purged just after Oslo midnight
+// by instrumentation.ts, which also purges both tags when the server starts
+export const TODAY_CACHE_TAG = "today";
+
+export const CACHE_TAGS = [CMS_CACHE_TAG, TODAY_CACHE_TAG] as const;
+export type CacheTag = (typeof CACHE_TAGS)[number];
+
+// The lifetime of every cache scope. A daily background refresh heals a
+// missed purge, and keeps the s-maxage that pages advertise to shared caches
+// down to a day. (An object rather than a named profile in next.config.mjs:
+// profile names only type-check after Next has generated its types)
+export const CMS_CACHE_LIFE = {
+  stale: 5 * 60,
+  revalidate: 24 * 60 * 60,
+  expire: 365 * 24 * 60 * 60,
+};
 
-// Clamped so a request just before midnight never yields revalidate ~0
 export function secondsUntilOsloMidnight(now: Date = new Date()): number {
   const osloNow = toZonedTime(now, timeZone);
   const nextOsloMidnight = startOfDay(addDays(osloNow, 1));
   const instant = fromZonedTime(nextOsloMidnight, timeZone);
-  return Math.max(
-    Math.ceil((instant.getTime() - now.getTime()) / 1000),
-    MIN_REVALIDATE_SECONDS
-  );
+  return Math.ceil((instant.getTime() - now.getTime()) / 1000);
 }
 
-// Per-operation contexts replace (not merge with) the client-default
-// fetchOptions, so both contexts below are self-contained
-
-// For per-user (search) and token-scoped (preview) queries
+// For per-user (search) and token-scoped (preview) queries, which must
+// never be stored
 export const uncached: Partial<OperationContext> = {
   fetchOptions: { cache: "no-store" },
 };
-
-// For queries whose results depend on "today" (futureEvents, opening hours)
-export function cachedUntilOsloMidnight(
-  now: Date = new Date()
-): Partial<OperationContext> {
-  return {
-    fetchOptions: {
-      // Part of the fetch cache key, so yesterday's entry is never reused
-      headers: { "x-oslo-day": formatInTimeZone(now, timeZone, "yyyy-MM-dd") },
-      next: { revalidate: secondsUntilOsloMidnight(now), tags: [CMS_CACHE_TAG] },
-    },
-  };
-}

web/src/lib/staticParams.ts

@@ -0,0 +1,29 @@
+import "server-only";
+
+import { cmsQuery } from "@/app/client";
+import { graphql } from "@/gql";
+
+const latestPageSlugQuery = graphql(`
+  query latestPageSlug($contentType: String!) {
+    pages(contentType: $contentType, order: "-first_published_at", limit: 1) {
+      id
+      slug
+    }
+  }
+`);
+
+// Can't collide with a real page: Wagtail slugs never start with an underscore
+const PLACEHOLDER_SLUG = "__ingen-sider__";
+
+// For routes with too many pages to prerender them all. Cache Components
+// needs at least one param set to validate the route at build time, so this
+// prerenders the latest page; the rest are rendered and cached on first
+// request. With no pages in the CMS yet, a placeholder that renders the 404
+// page keeps the build working
+export async function latestSlugParams(
+  contentType: string
+): Promise<{ slug: string }[]> {
+  const data = await cmsQuery(latestPageSlugQuery, { contentType });
+  const slug = data?.pages?.[0]?.slug ?? PLACEHOLDER_SLUG;
+  return [{ slug }];
+}

web/src/lib/today.ts

@@ -0,0 +1,19 @@
+import "server-only";
+
+import { todayCache } from "@/lib/cmsCache";
+import { osloDay, startOfOsloDay } from "@/lib/date";
+
+// The current Oslo day ("yyyy-MM-dd"), cached until the midnight purge. This
+// is the only place rendering code gets "today" from, so prerendered pages
+// stay static for the whole day and roll over together
+export async function getOsloDay(): Promise<string> {
+  "use cache";
+  todayCache();
+  return osloDay();
+}
+
+// Start of the current Oslo day, for Server Components; Client Components
+// use useToday()
+export async function getToday(): Promise<Date> {
+  return startOfOsloDay(await getOsloDay());
+}

web/tests/smoke/fixtures.ts

@@ -10,6 +10,7 @@ import type {
   AllAssociationsQuery,
   AllGenericSlugsQuery,
   AllVenueSlugsQuery,
+  LatestPageSlugQuery,
   AssociationBySlugQuery,
   AssociationFragment,
   AssociationIndexFragment,
@@ -53,6 +54,8 @@ import type {
 
 export type MockState = {
   newsHeadlineVersion: "v1" | "v2";
+  // how long the CMS takes to answer newsBySlug, to hold a page render open
+  newsDelayMs?: number;
 };
 
 export const SLUGS = {
@@ -60,6 +63,8 @@ export const SLUGS = {
   association: "testforening",
   venue: "storsalen",
   news: "test-artikkel",
+  // exists in the CMS but is not prerendered: rendered on first request
+  newsOnDemand: "eldre-artikkel",
   event: "testkonsert",
 } as const;
 
@@ -98,7 +103,7 @@ export function makeFixtures(cmsBaseUrl: string): Fixtures {
     __typename: "EventCategory",
     name: "Konsert",
     slug: "konsert",
-    pig: "PIG_PINK",
+    pig: "music",
     showInFilters: true,
   } satisfies EventCategoryFragment;
 
@@ -158,7 +163,8 @@ export function makeFixtures(cmsBaseUrl: string): Fixtures {
     seoTitle: "Testkonsert",
     searchDescription: null,
     lead: "Bli med på testkonsert.",
-    pig: "PIG_PINK",
+    // picks a pig from the event's categories, which must be prerenderable
+    pig: "automatic",
     facebookUrl: null,
     ticketUrl: null,
     free: true,
@@ -344,6 +350,15 @@ export function makeFixtures(cmsBaseUrl: string): Fixtures {
       ({
         pages: [{ id: "30", slug: SLUGS.venue }],
       }) satisfies AllVenueSlugsQuery,
+    latestPageSlug: (vars) =>
+      ({
+        pages:
+          vars.contentType === "news.NewsPage"
+            ? [{ id: "20", slug: SLUGS.news }]
+            : vars.contentType === "events.EventPage"
+              ? [{ id: "10", slug: SLUGS.event }]
+              : [],
+      }) satisfies LatestPageSlugQuery,
 
     // --- build time: static pages ---
     home: (_vars, state) =>
@@ -412,7 +427,10 @@ export function makeFixtures(cmsBaseUrl: string): Fixtures {
     // --- runtime ---
     newsBySlug: (vars, state) =>
       ({
-        news: vars.slug === SLUGS.news ? mask(newsPage(state)) : null,
+        news:
+          vars.slug === SLUGS.news || vars.slug === SLUGS.newsOnDemand
+            ? mask(newsPage(state))
+            : null,
       }) satisfies NewsBySlugQuery,
     eventBySlug: (vars) =>
       ({

web/tests/smoke/global-setup.ts

@@ -79,6 +79,8 @@ export default async function setup(project: TestProject) {
     );
   });
 
+  mock.markBuildDone();
+
   if (mock.graphqlRequests === 0) {
     throw new Error(
       "next build made no GraphQL requests to the mock CMS — is WAGTAIL_BASE_URL being overridden?"

web/tests/smoke/mock-cms.ts

@@ -19,6 +19,12 @@ export type MockCms = {
   url: string;
   state: MockState;
   graphqlRequests: number;
+  // GraphQL requests per operation name, served at /__mock/requests so tests
+  // can tell which queries a re-render actually sent
+  requestsByOperation: Record<string, number>;
+  // call once `next build` is done; /__mock/requests then also reports the
+  // requests made since
+  markBuildDone(): void;
   close(): Promise<void>;
 };
 
@@ -34,11 +40,16 @@ function readBody(req: http.IncomingMessage): Promise<string> {
 export async function startMockCms(): Promise<MockCms> {
   const state: MockState = { newsHeadlineVersion: "v1" };
   let fixtures: Fixtures | null = null; // built once we know our own URL
+  let requestsAtBuild: Record<string, number> = {};
 
   const mock: MockCms = {
     url: "",
     state,
     graphqlRequests: 0,
+    requestsByOperation: {},
+    markBuildDone: () => {
+      requestsAtBuild = { ...mock.requestsByOperation };
+    },
     close: () =>
       new Promise((resolve, reject) =>
         server.close((err) => (err ? reject(err) : resolve()))
@@ -56,6 +67,20 @@ export async function startMockCms(): Promise<MockCms> {
         return;
       }
 
+      if (req.method === "GET" && req.url === "/__mock/requests") {
+        const sinceBuild = Object.fromEntries(
+          Object.entries(mock.requestsByOperation).map(([name, count]) => [
+            name,
+            count - (requestsAtBuild[name] ?? 0),
+          ])
+        );
+        res.writeHead(200, { "content-type": "application/json" });
+        res.end(
+          JSON.stringify({ total: mock.requestsByOperation, sinceBuild })
+        );
+        return;
+      }
+
       if (req.method === "POST" && req.url === "/__mock/state") {
         Object.assign(state, JSON.parse(await readBody(req)));
         res.writeHead(200, { "content-type": "application/json" });
@@ -84,6 +109,10 @@ export async function startMockCms(): Promise<MockCms> {
         const name =
           body.operationName ??
           /(?:query|mutation)\s+(\w+)/.exec(body.query ?? "")?.[1];
+        if (name) {
+          mock.requestsByOperation[name] =
+            (mock.requestsByOperation[name] ?? 0) + 1;
+        }
         const resolve = name ? fixtures?.[name] : undefined;
         res.writeHead(200, { "content-type": "application/json" });
         if (!resolve) {
@@ -96,7 +125,14 @@ export async function startMockCms(): Promise<MockCms> {
           );
           return;
         }
-        res.end(JSON.stringify({ data: resolve(body.variables ?? {}, state) }));
+        // decide the answer first: a slow CMS returns what it had when asked
+        const answer = JSON.stringify({
+          data: resolve(body.variables ?? {}, state),
+        });
+        if (name === "newsBySlug" && state.newsDelayMs) {
+          await new Promise((r) => setTimeout(r, state.newsDelayMs));
+        }
+        res.end(answer);
         return;
       }
 

web/tests/smoke/smoke.test.ts

@@ -1,12 +1,12 @@
 // HTTP smoke tests against the built standalone app (see global-setup.ts).
 // These cover the surfaces most likely to break on a Next.js upgrade:
 // prerendered and request-rendered routes, 404s, the events API, the image
-// optimizer, the fetch-cache + tag revalidation round trip, and draft-mode
+// optimizer, the cache + tag revalidation round trip, and draft-mode
 // preview.
 
-import { beforeAll, describe, expect, inject, test } from "vitest";
+import { afterAll, beforeAll, describe, expect, inject, test } from "vitest";
 
-import { SLUGS } from "./fixtures";
+import { type MockState, SLUGS } from "./fixtures";
 
 const app = (path: string) => `${inject("appUrl")}${path}`;
 const mock = (path: string) => `${inject("mockUrl")}${path}`;
@@ -16,14 +16,46 @@ async function getPage(path: string): Promise<{ status: number; html: string }>
   return { status: res.status, html: await res.text() };
 }
 
-async function setNewsVersion(version: "v1" | "v2"): Promise<void> {
+async function setMockState(state: Partial<MockState>): Promise<void> {
   const res = await fetch(mock("/__mock/state"), {
     method: "POST",
-    body: JSON.stringify({ newsHeadlineVersion: version }),
+    body: JSON.stringify(state),
   });
   expect(res.status).toBe(200);
 }
 
+const setNewsVersion = (version: "v1" | "v2") =>
+  setMockState({ newsHeadlineVersion: version });
+
+type CmsRequests = Record<string, number>;
+
+// GraphQL requests the mock CMS has received, per operation name
+async function cmsRequests(): Promise<{
+  total: CmsRequests;
+  sinceBuild: CmsRequests;
+}> {
+  const res = await fetch(mock("/__mock/requests"));
+  return res.json() as Promise<{ total: CmsRequests; sinceBuild: CmsRequests }>;
+}
+
+// Nothing expires by time: the server purges its own cache when it starts
+// and at Oslo midnight (instrumentation.ts).
+// Must stay the first test: any later purge would also make this pass
+describe("startup purge", () => {
+  test("pages from the build are rendered again", async () => {
+    // the purge lands just after the server starts listening
+    const deadline = Date.now() + 10_000;
+    let sinceBuild: CmsRequests = {};
+    while (Date.now() < deadline) {
+      await getPage("/");
+      ({ sinceBuild } = await cmsRequests());
+      if ((sinceBuild.home ?? 0) > 0) break;
+      await new Promise((r) => setTimeout(r, 250));
+    }
+    expect(sinceBuild.home ?? 0).toBeGreaterThan(0);
+  });
+});
+
 describe("pages", () => {
   test.each([
     ["/", "Testkonsert"],
@@ -32,7 +64,7 @@ describe("pages", () => {
     [`/${SLUGS.genericUrl}`, "Praktisk info"],
     [`/foreninger/${SLUGS.association}`, "Testforeningen"],
     [`/lokaler/${SLUGS.venue}`, "Storsalen"],
-    // not prerendered (empty generateStaticParams) — rendered on first request
+    // only the latest page of each is prerendered; these are the latest
     [`/aktuelt/${SLUGS.news}`, "Testartikkel"],
     [`/arrangementer/${SLUGS.event}`, "Testkonsert"],
   ])("%s renders and contains %s", async (path, needle) => {
@@ -51,6 +83,23 @@ describe("pages", () => {
   );
 });
 
+describe("event list", () => {
+  // The list is rendered per request inside the prerendered page, so that
+  // the URL's filters are applied on the server (no layout shift)
+  const activeButton = (html: string) =>
+    /data-active="true"[^>]*><span>Vis (liste|kalender)<\/span>/.exec(html)?.[1];
+
+  test("is server-rendered in list mode by default", async () => {
+    const { html } = await getPage("/arrangementer");
+    expect(activeButton(html)).toBe("liste");
+  });
+
+  test("is server-rendered with the mode from the URL", async () => {
+    const { html } = await getPage("/arrangementer?mode=calendar");
+    expect(activeButton(html)).toBe("kalender");
+  });
+});
+
 describe("events api", () => {
   test("rejects a missing view parameter", async () => {
     const res = await fetch(app("/api/v1/events"));
@@ -84,15 +133,18 @@ describe("image optimizer", () => {
   });
 });
 
-describe("fetch cache and tag revalidation", () => {
-  const path = `/aktuelt/${SLUGS.news}`;
-
+// Runs for a page prerendered at build time and for one rendered on its
+// first request, which is how most news and event pages are served
+describe.each([
+  ["prerendered", `/aktuelt/${SLUGS.news}`],
+  ["rendered on demand", `/aktuelt/${SLUGS.newsOnDemand}`],
+])("cache and tag revalidation (%s page)", (_kind, path) => {
   beforeAll(async () => {
     await setNewsVersion("v1");
   });
 
   test("serves cached content until the webhook fires, then updates", async () => {
-    // prime the cache (the route is request-rendered, then cached)
+    // prerendered at build time or rendered now; either way the CMS has v1
     const first = await getPage(path);
     expect(first.status).toBe(200);
     expect(first.html).toContain("Testartikkel (v1)");
@@ -136,6 +188,86 @@ describe("fetch cache and tag revalidation", () => {
   });
 });
 
+// Next stamps a cached page when its render finishes, so a page that was
+// being rendered while a purge came in looks newer than the purge. The
+// server sends itself a follow-up purge a few seconds after each webhook
+describe("purge during a render", () => {
+  const path = `/aktuelt/${SLUGS.newsOnDemand}`;
+  const webhook = () =>
+    fetch(app("/api/revalidate"), {
+      method: "POST",
+      headers: { "x-revalidate-secret": "smoke-secret" },
+    });
+
+  afterAll(async () => {
+    await setMockState({ newsDelayMs: 0 });
+  });
+
+  test("two edits in quick succession end up showing the second", async () => {
+    // first edit: published and purged, and the CMS is slow to answer
+    await setMockState({ newsHeadlineVersion: "v1", newsDelayMs: 1_500 });
+    expect((await webhook()).status).toBe(200);
+    const visitor = getPage(path);
+    await new Promise((r) => setTimeout(r, 300));
+
+    // second edit lands while the visitor's page is still rendering
+    await setMockState({ newsHeadlineVersion: "v2", newsDelayMs: 0 });
+    expect((await webhook()).status).toBe(200);
+
+    // that visitor gets what the CMS had when it was asked
+    expect((await visitor).html).toContain("Testartikkel (v1)");
+
+    // everyone after must get the second edit once the follow-up has run
+    const deadline = Date.now() + 12_000;
+    let html = "";
+    while (Date.now() < deadline) {
+      ({ html } = await getPage(path));
+      if (html.includes("Testartikkel (v2)")) break;
+      await new Promise((r) => setTimeout(r, 500));
+    }
+    expect(html).toContain("Testartikkel (v2)");
+  }, 30_000);
+});
+
+describe("midnight purge", () => {
+  async function cacheStatus(path: string): Promise<string | null> {
+    const res = await fetch(app(path));
+    await res.text();
+    return res.headers.get("x-nextjs-cache");
+  }
+
+  test("the midnight purge re-renders pages but only refetches date-dependent data", async () => {
+    const purgeToday = () =>
+      fetch(app("/api/revalidate?tag=today"), {
+        method: "POST",
+        headers: { "x-revalidate-secret": "smoke-secret" },
+      });
+
+    // settle: everything rendered and cached by this server process
+    expect((await purgeToday()).status).toBe(200);
+    await getPage("/");
+    await getPage("/kontakt");
+    expect(await cacheStatus("/")).toBe("HIT");
+    expect(await cacheStatus("/kontakt")).toBe("HIT");
+    const before = (await cmsRequests()).total;
+
+    expect((await purgeToday()).status).toBe(200);
+
+    // every page shows today's date somewhere, so every page renders again
+    expect(await cacheStatus("/")).not.toBe("HIT");
+    expect(await cacheStatus("/kontakt")).not.toBe("HIT");
+    expect(await cacheStatus("/")).toBe("HIT");
+    expect(await cacheStatus("/kontakt")).toBe("HIT");
+
+    const after = (await cmsRequests()).total;
+    // the home page asks the CMS for future events again...
+    expect(after.home).toBe(before.home + 1);
+    // ...while content that only changes on edit comes from the cache
+    expect(after.contacts).toBe(before.contacts);
+    expect(after.openingHoursSets).toBe(before.openingHoursSets);
+  });
+});
+
 describe("preview", () => {
   test("draft mode round trip renders the preview page", async () => {
     const enable = await fetch(