Fix GA4 measurement health for sparse API responses (#512)

.agents/PAPERCUTS.md

@@ -10,6 +10,7 @@ data, or sensitive paths.
 
 ## Open
 
+- [ ] `2026-08-20T20:36:32Z` — `codex` — The PR preview Access check treats an immediate workers.dev 404 as proof the preview is public, even though the same URL can begin returning the expected Access redirect seconds later; retry 404 responses as propagation-era errors before failing and recommending stage destruction.
 - [ ] `2026-08-18T03:06:44Z` — `claude` — Changing an MCP tool's `outputSchema` while the dev server hot-reloads makes in-flight MCP sessions reject the tool's own (already billed) results — clients validate against the schema cached at connect time, surfacing as "must NOT have additional properties". Note in the MCP dev docs/skill: reconnect the MCP session after any output-schema change before re-testing live.
 - [ ] `2026-08-05T20:59:09Z` — `codex` — The documented `pnpm seed:rank-tracking` command fails before opening local D1 because `scripts/seed-rank-tracking.ts` imports the provider-aware `src/db/schema` barrel and plain `tsx` cannot load the resulting `cloudflare:workers` URL. Keep the seed script on dialect-local schema imports or run it through a Workers-compatible execution path. (Workaround: seed via raw SQL with `wrangler d1 execute DB --local`.)
 - [ ] `2026-08-01T16:28:36Z` — `claude` — web's pinned wrangler 4.71.0 fails `kv namespace create` with a bare "Authentication error [code: 10000]" even though the OAuth token has workers_kv write scope; wrangler@4.118.0 succeeds with identical auth. Fix: bump wrangler in web/package.json.

src/server/lib/ga4Client.test.ts

@@ -164,14 +164,6 @@ describe("ga4Client admin API", () => {
       .mockResolvedValueOnce(
         jsonResponse({
           streamEnabled: true,
-          scrollsEnabled: true,
-          outboundClicksEnabled: true,
-          siteSearchEnabled: true,
-          videoEngagementEnabled: true,
-          fileDownloadsEnabled: true,
-          pageChangesEnabled: true,
-          formInteractionsEnabled: false,
-          searchQueryParameter: "q,s",
         }),
       )
       .mockResolvedValueOnce(
@@ -222,7 +214,11 @@ describe("ga4Client admin API", () => {
     const metrics = await client.listCustomMetrics("properties/11");
 
     expect(streams[0]?.webStreamData?.measurementId).toBe("G-ABC123");
-    expect(enhanced.siteSearchEnabled).toBe(true);
+    expect(enhanced).toMatchObject({
+      streamEnabled: true,
+      siteSearchEnabled: false,
+      searchQueryParameter: "",
+    });
     expect(keyEvents[0]?.eventName).toBe("purchase");
     expect(dimensions[0]?.parameterName).toBe("content_type");
     expect(metrics[0]?.parameterName).toBe("quality_score");

src/server/lib/ga4Client.ts

@@ -66,15 +66,16 @@ const dataStreamsResponseSchema = z.object({
   nextPageToken: z.string().optional(),
 });
 const enhancedMeasurementSettingsSchema = z.object({
-  streamEnabled: z.boolean(),
+  // ProtoJSON omits scalar fields at their default values.
-  scrollsEnabled: z.boolean(),
+  streamEnabled: z.boolean().default(false),
-  outboundClicksEnabled: z.boolean(),
+  scrollsEnabled: z.boolean().default(false),
-  siteSearchEnabled: z.boolean(),
+  outboundClicksEnabled: z.boolean().default(false),
-  videoEngagementEnabled: z.boolean(),
+  siteSearchEnabled: z.boolean().default(false),
-  fileDownloadsEnabled: z.boolean(),
+  videoEngagementEnabled: z.boolean().default(false),
-  pageChangesEnabled: z.boolean(),
+  fileDownloadsEnabled: z.boolean().default(false),
-  formInteractionsEnabled: z.boolean(),
+  pageChangesEnabled: z.boolean().default(false),
-  searchQueryParameter: z.string(),
+  formInteractionsEnabled: z.boolean().default(false),
+  searchQueryParameter: z.string().default(""),
   uriQueryParameter: z.string().optional().default(""),
 });
 const keyEventSchema = z.object({