fix(telegram): tolerate invalid bridge dates

packages/bridges/telegram/src/index.test.ts

@@ -1,6 +1,6 @@
 import { afterEach, describe, expect, it, vi } from 'vitest';
 import { contractTestBridge } from '@profullstack/sh1pt-core/testing';
-import adapter from './index.js';
+import adapter, { telegramTimestamp } from './index.js';
 
 contractTestBridge(adapter, {
   sampleConfig: {},
@@ -11,6 +11,18 @@ afterEach(() => {
   vi.restoreAllMocks();
 });
 
+describe('telegramTimestamp', () => {
+  it('maps valid Unix seconds to ISO timestamps', () => {
+    expect(telegramTimestamp(1_779_321_600)).toBe('2026-05-21T00:00:00.000Z');
+  });
+
+  it('falls back instead of throwing for invalid or out-of-range dates', () => {
+    for (const value of [undefined, Number.NaN, Number.POSITIVE_INFINITY, 1e20]) {
+      expect(telegramTimestamp(value)).toBe('1970-01-01T00:00:00.000Z');
+    }
+  });
+});
+
 describe('bridge-telegram Bot API integration', () => {
   it('sends relayed messages through sendMessage', async () => {
     const fetchMock = vi.spyOn(globalThis, 'fetch').mockResolvedValue({

packages/bridges/telegram/src/index.ts

@@ -161,11 +161,17 @@ function toBridgeMessage(message: TelegramMessage): BridgeMessage {
     text: message.text ?? message.caption ?? '',
     replyToId: message.reply_to_message?.message_id ? String(message.reply_to_message.message_id) : undefined,
     attachments: telegramAttachments(message),
-    timestamp: new Date(message.date * 1000).toISOString(),
+    timestamp: telegramTimestamp(message.date),
     originalNetwork: 'telegram',
   };
 }
 
+export function telegramTimestamp(seconds: number | undefined): string {
+  if (typeof seconds !== 'number' || !Number.isFinite(seconds)) return new Date(0).toISOString();
+  const date = new Date(seconds * 1000);
+  return Number.isNaN(date.getTime()) ? new Date(0).toISOString() : date.toISOString();
+}
+
 function telegramUsername(user: TelegramUser | TelegramChat): string {
   if ('username' in user && user.username) return user.username;
   if ('first_name' in user) return [user.first_name, user.last_name].filter(Boolean).join(' ');