const blobHolders = await fetchThreadBlobHoldersToDelete(threadIDs);
await removeBlobHolders(blobHolders);

const [{ threadInfos: serverThreadInfos }] = await Promise.all([
  fetchServerThreadInfos({ threadIDs: new Set(threadIDs) }),
  rescindPushNotifs(
    SQL`n.thread IN (${threadIDs})`,
    SQL`IF(m.thread IN (${threadIDs}), NULL, m.thread)`,
  ),
]);

const time = Date.now();
const updateDatas = [];
for (const containedThreadID of threadIDs) {
  for (const memberInfo of serverThreadInfos[containedThreadID].members) {
    updateDatas.push({
      type: updateTypes.DELETE_THREAD,
      userID: memberInfo.id,
      time,
      threadID: containedThreadID,
    });
  }
}

const [{ viewerUpdates }] = await Promise.all([
  createUpdates(updateDatas, { viewer, updatesForCurrentSession: 'return' }),
  deleteThreadsFromDB(threadIDs),
]);

await removeBlobHolders(blobHolders);
await deleteThreadsFromDB(containerIDs);