fix: preserve free results and request pacing

packages/core/src/scrapers/facebook.ts

@@ -1205,7 +1205,8 @@ export default async function fetchFacebookItems(
 
   // Filter to only priced items (already done in parseFacebookAds)
   const pricedItems = items.filter(
-    (item) => item.listingPrice?.cents && item.listingPrice.cents > 0,
+    (item) =>
+      typeof item.listingPrice?.cents === "number" && item.listingPrice.cents >= 0,
   );
 
   progressBar.update(totalProgress);

packages/core/src/scrapers/kijiji.ts

@@ -889,15 +889,15 @@ export default async function fetchKijijiItems(
     progressBar?.start(totalProgress, currentProgress);
 
     // Process in batches for controlled concurrency
-    const CONCURRENT_REQUESTS = Math.max(1, Math.floor(requestsPerSecond * 2)); // 2x rate for faster processing
+    const CONCURRENT_REQUESTS = 1;
     const results: (DetailedListing | null)[] = [];
 
     for (let i = 0; i < newListingLinks.length; i += CONCURRENT_REQUESTS) {
       const batch = newListingLinks.slice(i, i + CONCURRENT_REQUESTS);
       const batchPromises = batch.map(async (link) => {
         try {
-          const html = await fetchHtml(link, 0, {
-            // No per-request delay, batch handles rate limit
+          const html = await fetchHtml(link, DELAY_MS, {
+            // Per-request delay keeps detail fetches within REQUESTS_PER_SECOND.
             onRateInfo: (remaining, reset) => {
               if (remaining && reset) {
                 console.log(
@@ -936,12 +936,6 @@ export default async function fetchKijijiItems(
       const batchResults = await Promise.all(batchPromises);
       results.push(...batchResults);
 
-      // Wait between batches to respect rate limit
-      if (i + CONCURRENT_REQUESTS < newListingLinks.length) {
-        await new Promise((resolve) =>
-          setTimeout(resolve, DELAY_MS * batch.length),
-        );
-      }
     }
 
     allListings.push(