fix: prevent infinite recursion in web_search and add upsert logic to db_set with new db_execute function

browse.h

@@ -47,7 +47,7 @@ char * web_search(char * q){
     if(!json_result){
         json_object_put(json_ret);
         free(ret);
-        return web_search_news(q);        
+        return web_search(q);        
     }
     json_object_put(json_ret);
     return ret;