feat: complete catalog fleet management workflow

frontend/src/test/msw-contract.test.ts

@@ -1,7 +1,13 @@
+import { getCatalogMetrics } from "../api/catalog-databases";
 import { checkDwhHealth } from "../api/sessions";
+import { emptyCatalogMetricsFixture } from "./msw";
 
 // Catches shared browser test fixtures drifting from the same-origin /api contract and
 // attempting real localhost network requests instead of using MSW.
 test("the shared MSW health fixture follows the browser same-origin API contract", async () => {
   await expect(checkDwhHealth()).resolves.toEqual({ ok: true, detail: "ok" });
 });
+
+test("the shared MSW catalog fixture exposes a valid empty metrics response", async () => {
+  await expect(getCatalogMetrics()).resolves.toEqual(emptyCatalogMetricsFixture);
+});

frontend/src/test/msw.ts

@@ -1,5 +1,20 @@
 import { setupServer } from "msw/node";
 import { http, HttpResponse } from "msw";
+import type { CatalogMetrics } from "../api/catalog-databases";
+
+export const emptyCatalogMetricsFixture = {
+  scope: "global",
+  databaseId: null,
+  tables: 0,
+  columns: 0,
+  sensitiveColumns: 0,
+  relationships: 0,
+  descriptionTargets: 0,
+  describedTargets: 0,
+  descriptionCoverage: 0,
+  updatedAt: null,
+} satisfies CatalogMetrics;
+
 export const server = setupServer(
   http.get("/api/auth/config", () => HttpResponse.json({ mode: "local", localLogin: true, oidcLogin: false })),
   http.get("/api/me", () => HttpResponse.json({
@@ -11,6 +26,8 @@ export const server = setupServer(
   })),
   http.get("/api/health/dwh", () => HttpResponse.json({ ok: true, detail: "ok" })),
   http.get("/api/catalog/databases", () => HttpResponse.json([])),
+  http.get("/api/catalog/metrics", () => HttpResponse.json(emptyCatalogMetricsFixture)),
   http.get("/api/catalog/metadata-generation/models", () => HttpResponse.json({ models: [], default: null })),
   http.get("/api/catalog/description-generation-runs", () => HttpResponse.json([])),
+  http.get("/api/catalog/sensitive-data-suggestion-runs", () => HttpResponse.json([])),
 );