Add Discord rate limiting to prevent 429 errors

- Limit new product notifications to 5 per check
- Add 1 second delay between Discord notifications
- Restocks still get full priority (always notified)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

chrome-extension/background.js

@@ -18,6 +18,7 @@ let config = DEFAULT_CONFIG;
 let persistentTabId = null; // Keep tab open for faster refreshes
 let checkLoopRunning = false; // Prevent multiple loops
 let isChecking = false; // Prevent overlapping checks
+let lastNotificationTime = 0; // Rate limiting for Discord
 
 // Initialize
 chrome.runtime.onInstalled.addListener(() => {
@@ -130,18 +131,28 @@ async function runStockCheck() {
 
       const { newProducts, restockedProducts } = processProducts(products);
 
-      // Send notifications
-      if (config.notifyNewProducts) {
-        for (const product of newProducts) {
-          if (product.inStock) {
-            await sendDiscordNotification(product, "new_drop");
+      // Send notifications with rate limiting
+      // Limit new product notifications to 5 per check to avoid Discord rate limits
+      const MAX_NEW_NOTIFICATIONS = 5;
+      let notificationsSent = 0;
+
+      if (config.notifyNewProducts && newProducts.length > 0) {
+        const inStockNew = newProducts.filter(p => p.inStock);
+        if (inStockNew.length > MAX_NEW_NOTIFICATIONS) {
+          console.log(`Limiting notifications: ${inStockNew.length} new products, only sending ${MAX_NEW_NOTIFICATIONS}`);
         }
+        for (const product of inStockNew.slice(0, MAX_NEW_NOTIFICATIONS)) {
+          await sendDiscordNotification(product, "new_drop");
+          notificationsSent++;
+          if (notificationsSent > 1) await new Promise(r => setTimeout(r, 1000)); // 1 sec delay between notifications
         }
       }
 
+      // Always notify restocks (these are high priority)
       if (config.notifyRestocks) {
         for (const product of restockedProducts) {
           await sendDiscordNotification(product, "restock");
+          await new Promise(r => setTimeout(r, 1000)); // 1 sec delay
         }
       }