fix: serper search caching

backend/functions/src/cloud-functions/sercher-serper.ts

@@ -478,14 +478,14 @@ ${suffixMixins.length ? `\n${suffixMixins.join('\n')}\n` : ''}`;
             const r = await this.serperSearchService.webSearch(query);
 
             const nowDate = new Date();
-            const record = SearchResult.from({
+            const record = SerperSearchResult.from({
                 query,
                 queryDigest,
                 response: r,
                 createdAt: nowDate,
                 expireAt: new Date(nowDate.valueOf() + this.cacheRetentionMs)
             });
-            SearchResult.save(record.degradeForFireStore()).catch((err) => {
+            SerperSearchResult.save(record.degradeForFireStore()).catch((err) => {
                 this.logger.warn(`Failed to cache search result`, { err });
             });