diff --git a/app/backend/src/lib/error-digest.ts b/app/backend/src/lib/error-digest.ts
new file mode 100644
index 0000000..a3efc51
--- /dev/null
+++ b/app/backend/src/lib/error-digest.ts
@@ -0,0 +1,48 @@
+import { prisma } from '../db.js';
+import { sendEmail } from './email.js';
+
+const ALERT_THRESHOLD = 50;
+const ALERT_RECIPIENT = process.env.ADMIN_ALERT_EMAIL || '';
+
+export async function sendErrorDigest(): Promise<{ sent: boolean; count: number }> {
+  const since = new Date();
+  since.setHours(0, 0, 0, 0);
+
+  const errors = await prisma.clientError.findMany({
+    where: { createdAt: { gte: since } },
+    orderBy: { createdAt: 'desc' },
+    take: 100,
+  });
+
+  const count = await prisma.clientError.count({
+    where: { createdAt: { gte: since } },
+  });
+
+  if (count < ALERT_THRESHOLD || !ALERT_RECIPIENT) {
+    return { sent: false, count };
+  }
+
+  const topMessages = Object.entries(
+    errors.reduce<Record<string, number>>((acc, e) => {
+      acc[e.message] = (acc[e.message] || 0) + 1;
+      return acc;
+    }, {}),
+  )
+    .sort(([, a], [, b]) => b - a)
+    .slice(0, 10);
+
+  const html = `
+    <div dir="rtl" style="font-family: Vazirmatn, sans-serif; max-width: 600px; margin: 0 auto;">
+      <h2 style="color: #C94C4C;">گزارش خطاهای روزانه تکناو</h2>
+      <p>تعداد خطاها در ۲۴ ساعت گذشته: <strong>${count}</strong></p>
+      <h3>بیشترین تکرار:</h3>
+      <ul>
+        ${topMessages.map(([msg, cnt]) => `<li><code>${msg}</code> (${cnt} بار)</li>`).join('')}
+      </ul>
+      <p style="color: #5F6B6D; font-size: 12px;">این گزارش از پنل خطاهای تکناو ارسال شده است.</p>
+    </div>
+  `;
+
+  await sendEmail({ to: ALERT_RECIPIENT, subject: `گزارش خطاهای تکناو — ${count} خطا`, html });
+  return { sent: true, count };
+}