first commit

apps/backend/src/modules/notifications/notifications.controller.ts

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+import type { Request, Response } from 'express';
+import { env } from '../../config/env.js';
+import { TransactionModel } from '../../models/transaction.model.js';
+import { getDefaultUserId } from '../../services/user-context.js';
+
+const maskSecret = (secret?: string | null) => {
+  if (!secret) return null;
+  if (secret.length <= 6) return '*'.repeat(secret.length);
+  return `${secret.slice(0, 3)}***${secret.slice(-3)}`;
+};
+
+export const getNotificationStatus = async (req: Request, res: Response) => {
+  const userId = await getDefaultUserId();
+  const filter = { userId, source: 'notification' as const };
+  const count = await TransactionModel.countDocuments(filter);
+  const latest = (await TransactionModel.findOne(filter).sort({ createdAt: -1 }).lean()) as
+    | { createdAt?: Date }
+    | null;
+  const ingestEndpoint = `${req.protocol}://${req.get('host') ?? 'localhost'}/api/transactions/notification`;
+
+  const secret = env.NOTIFICATION_WEBHOOK_SECRET;
+  const response = {
+    secretConfigured: Boolean(secret),
+    secretHint: maskSecret(secret),
+    webhookSecret: env.isProduction ? null : secret ?? null,
+    packageWhitelist: env.notificationPackageWhitelist,
+    ingestedCount: count,
+    lastNotificationAt: latest?.createdAt ? new Date(latest.createdAt).toISOString() : null,
+    ingestEndpoint
+  };
+
+  return res.json(response);
+};

apps/backend/src/modules/notifications/notifications.router.ts

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+import { Router } from 'express';
+import { getNotificationStatus } from './notifications.controller.js';
+
+const router = Router();
+
+router.get('/status', getNotificationStatus);
+
+export default router;