Add owner-only operational counts dashboard

app/api/admin/operations/route.ts

@@ -0,0 +1,16 @@
+import { env } from 'cloudflare:workers';
+import { AdminError, requireAdmin } from '@/db/admin-access';
+import { readAdminOperations } from '@/db/admin-operations';
+import { adminFailure, adminResponse, adminToken } from '@/lib/admin-http';
+import { buildRevision } from '@/lib/build-revision';
+
+export async function GET(request: Request) {
+  try {
+    const identity = await requireAdmin(env.DB, adminToken(request), ['owner']);
+    const expected = request.headers.get('X-Dune-Admin-Id');
+    if (expected && expected !== identity.id)
+      throw new AdminError('The signed-in administrator changed. Reload operations.', 401);
+    const counts = await readAdminOperations(env.DB, identity);
+    return adminResponse({ revision: buildRevision, ...counts });
+  } catch (error) { return adminFailure(error); }
+}