Retain failed download destinations for later cleanup

src/chat/chat_msg.c

@@ -1596,7 +1596,7 @@ static void cache_file_collect_cb(const struct media_msg_file* f, void* arg) {
 /* Фактическая сумма размеров файлов, соответствующих сообщениям. */
 static uint64_t chat_media_cache_scan_sum(struct chat_core_ctx* cc) {
     char media_base[MEDIA_BASE_MAX];
-    if (media_index_get_base(cc->db, media_base)) return;
+    if (media_index_get_base(cc->db, media_base)) return cc->media_cache_bytes;
     struct cache_file_list files = {0};
     chat_media_foreach_media_message(cc, media_base, cache_file_collect_cb, &files);
     uint64_t sum = 0;

src/media_delivery/media_download.c

@@ -880,6 +880,8 @@ int media_download_start(struct UTUN_INSTANCE* inst, uint64_t group_id,
         DEBUG_WARN(DEBUG_CATEGORY_GENERAL, "%s: DUPLICATE download media=%02x%02x... ignored", MDL_ID, result->media_id[0], result->media_id[1]);
         return 0;
     }
+    char channel[32]; snprintf(channel, sizeof(channel), "%llu", (unsigned long long)group_id);
+    if (media_index_track_preparation(inst->topo_sqlite_db, channel, dest_path, media_base)) return -1;
 
     struct media_download* dl = u_calloc(1, sizeof(*dl));
     if (!dl) { DEBUG_ERROR(DEBUG_CATEGORY_GENERAL, "%s: u_calloc for download failed", MDL_ID); return -1; }