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	diff --git a/keyserver/src/creators/message-report-creator.js b/keyserver/src/creators/message-report-creator.js
	--- a/keyserver/src/creators/message-report-creator.js
	+++ b/keyserver/src/creators/message-report-creator.js
	@@ -75,26 +75,24 @@
	viewer,
	request.messageID,
	);
	- const promises = {};
	-
	- promises.viewerUsername = fetchUsername(viewer.id);
	+ const viewerUsernamePromise = fetchUsername(viewer.id);

	const keyserverAdminID = await keyserverAdminIDPromise;
	if (!keyserverAdminID) {
	throw new ServerError('keyserver_admin_not_found');
	}
	- promises.commbotThreadID = getCommbotThreadID(keyserverAdminID);
	+ const commbotThreadIDPromise = getCommbotThreadID(keyserverAdminID);

	const reportedMessage = await reportedMessagePromise;

	- if (reportedMessage) {
	- promises.reportedThread = serverThreadInfoFromMessageInfo(reportedMessage);
	- }
	+ const reportedThreadPromise: Promise<?ServerThreadInfo> = reportedMessage
	+ ? serverThreadInfoFromMessageInfo(reportedMessage)
	+ : Promise.resolve(undefined);

	const reportedMessageAuthorID = reportedMessage?.creatorID;
	- if (reportedMessageAuthorID) {
	- promises.reportedMessageAuthor = fetchUsername(reportedMessageAuthorID);
	- }
	+ const reportedMessageAuthorPromise: Promise<?string> = reportedMessageAuthorID
	+ ? fetchUsername(reportedMessageAuthorID)
	+ : Promise.resolve(undefined);

	const reportedMessageText =
	reportedMessage?.type === 0 ? reportedMessage.text : null;
	@@ -104,7 +102,12 @@
	commbotThreadID,
	reportedThread,
	reportedMessageAuthor,
	- } = await promiseAll(promises);
	+ } = await promiseAll({
	+ viewerUsername: viewerUsernamePromise,
	+ commbotThreadID: commbotThreadIDPromise,
	+ reportedThread: reportedThreadPromise,
	+ reportedMessageAuthor: reportedMessageAuthorPromise,
	+ });

	return {
	reportedMessageText,
	diff --git a/keyserver/src/creators/thread-creator.js b/keyserver/src/creators/thread-creator.js
	--- a/keyserver/src/creators/thread-creator.js
	+++ b/keyserver/src/creators/thread-creator.js
	@@ -185,18 +185,19 @@
	return { initialMemberIDs, ghostMemberIDs };
	})();

	- const checkPromises = {};
	- checkPromises.confirmParentPermission = confirmParentPermissionPromise;
	- checkPromises.threadAncestry = determineThreadAncestryPromise;
	- checkPromises.validateMembers = validateMembersPromise;
	- if (sourceMessageID) {
	- checkPromises.sourceMessage = fetchMessageInfoByID(viewer, sourceMessageID);
	- }
	+ const sourceMessagePromise: Promise<?RawMessageInfo> = sourceMessageID
	+ ? fetchMessageInfoByID(viewer, sourceMessageID)
	+ : Promise.resolve(undefined);
	const {
	sourceMessage,
	threadAncestry,
	validateMembers: { initialMemberIDs, ghostMemberIDs },
	- } = await promiseAll(checkPromises);
	+ } = await promiseAll({
	+ sourceMessage: sourceMessagePromise,
	+ threadAncestry: determineThreadAncestryPromise,
	+ validateMembers: validateMembersPromise,
	+ confirmParentPermission: confirmParentPermissionPromise,
	+ });

	if (sourceMessage && isInvalidSidebarSource(sourceMessage)) {
	throw new ServerError('invalid_parameters');
	diff --git a/keyserver/src/creators/update-creator.js b/keyserver/src/creators/update-creator.js
	--- a/keyserver/src/creators/update-creator.js
	+++ b/keyserver/src/creators/update-creator.js
	@@ -16,11 +16,14 @@
	import {
	type CalendarQuery,
	defaultCalendarQuery,
	+ type RawEntryInfos,
	type RawEntryInfo,
	+ type FetchEntryInfosBase,
	} from 'lib/types/entry-types.js';
	import {
	defaultNumberPerThread,
	type MessageSelectionCriteria,
	+ type FetchMessageInfosResult,
	type RawMessageInfo,
	} from 'lib/types/message-types.js';
	import {
	@@ -35,7 +38,7 @@
	type RawUpdateInfo,
	type CreateUpdatesResult,
	} from 'lib/types/update-types.js';
	-import type { UserInfos } from 'lib/types/user-types.js';
	+import type { UserInfos, LoggedInUserInfo } from 'lib/types/user-types.js';
	import { promiseAll } from 'lib/utils/promises.js';

	import createIDs from './id-creator.js';
	@@ -47,7 +50,10 @@
	fetchEntryInfosByID,
	} from '../fetchers/entry-fetchers.js';
	import { fetchMessageInfos } from '../fetchers/message-fetchers.js';
	-import { fetchThreadInfos } from '../fetchers/thread-fetchers.js';
	+import {
	+ fetchThreadInfos,
	+ type FetchThreadInfosResult,
	+} from '../fetchers/thread-fetchers.js';
	import {
	fetchKnownUserInfos,
	fetchCurrentUserInfo,
	@@ -337,39 +343,50 @@
	deleteSQLConditions.push(mergeAndConditions(sqlConditions));
	}

	- const promises = {};
	-
	- if (insertRows.length > 0) {
	+ const insertPromise = (async () => {
	+ if (insertRows.length === 0) {
	+ return;
	+ }
	const insertQuery = SQL`
	INSERT INTO updates(id, user, type, \`key\`,
	content, time, updater, target)
	`;
	insertQuery.append(SQL`VALUES ${insertRows}`);
	- promises.insert = dbQuery(insertQuery);
	- }
	+ await dbQuery(insertQuery);
	+ })();

	- if (publishInfos.size > 0) {
	- promises.redis = redisPublish(publishInfos.values(), dontBroadcastSession);
	- }
	+ const redisPromise =
	+ publishInfos.size > 0
	+ ? redisPublish(publishInfos.values(), dontBroadcastSession)
	+ : Promise.resolve(undefined);

	- if (deleteSQLConditions.length > 0) {
	- promises.delete = (async () => {
	- while (deleteSQLConditions.length > 0) {
	- const batch = deleteSQLConditions.splice(0, deleteUpdatesBatchSize);
	- await deleteUpdatesByConditions(batch);
	- }
	- })();
	- }
	+ const deletePromise = (async () => {
	+ if (deleteSQLConditions.length === 0) {
	+ return;
	+ }
	+ while (deleteSQLConditions.length > 0) {
	+ const batch = deleteSQLConditions.splice(0, deleteUpdatesBatchSize);
	+ await deleteUpdatesByConditions(batch);
	+ }
	+ })();

	- if (viewerRawUpdateInfos.length > 0) {
	+ const updatesPromise: Promise<?FetchUpdatesResult> = (async () => {
	+ if (viewerRawUpdateInfos.length === 0) {
	+ return undefined;
	+ }
	invariant(viewerInfo, 'should be set');
	- promises.updatesResult = fetchUpdateInfosWithRawUpdateInfos(
	+ return await fetchUpdateInfosWithRawUpdateInfos(
	viewerRawUpdateInfos,
	viewerInfo,
	);
	- }
	+ })();

	- const { updatesResult } = await promiseAll(promises);
	+ const { updatesResult } = await promiseAll({
	+ updatesResult: updatesPromise,
	+ insertResult: insertPromise,
	+ redisResult: redisPromise,
	+ deleteResult: deletePromise,
	+ });
	if (!updatesResult) {
	return defaultUpdateCreationResult;
	}
	@@ -407,27 +424,31 @@
	entitiesToFetch.map(({ userID }) => userID).filter(Boolean),
	);

	- const promises = {};
	-
	const { viewer } = viewerInfo;
	- if (!viewerInfo.threadInfos && threadIDsNeedingFetch.size > 0) {
	- promises.threadResult = fetchThreadInfos(viewer, {
	+ const threadPromise: Promise<?FetchThreadInfosResult> = (async () => {
	+ if (viewerInfo.threadInfos \|\| threadIDsNeedingFetch.size === 0) {
	+ return undefined;
	+ }
	+ return await fetchThreadInfos(viewer, {
	threadIDs: threadIDsNeedingFetch,
	});
	- }
	+ })();

	- let calendarQuery: ?CalendarQuery = viewerInfo.calendarQuery
	- ? viewerInfo.calendarQuery
	- : null;
	- if (!calendarQuery && viewer.hasSessionInfo) {
	+ let calendarQueryTmp: ?CalendarQuery = viewerInfo.calendarQuery ?? null;
	+ if (!calendarQueryTmp && viewer.hasSessionInfo) {
	// This should only ever happen for "legacy" clients who call in without
	// providing this information. These clients wouldn't know how to deal with
	// the corresponding UpdateInfos anyways, so no reason to be worried.
	- calendarQuery = viewer.calendarQuery;
	- } else if (!calendarQuery) {
	- calendarQuery = defaultCalendarQuery(viewer.platform, viewer.timeZone);
	+ calendarQueryTmp = viewer.calendarQuery;
	+ } else if (!calendarQueryTmp) {
	+ calendarQueryTmp = defaultCalendarQuery(viewer.platform, viewer.timeZone);
	}
	- if (threadIDsNeedingDetailedFetch.size > 0) {
	+ const calendarQuery = calendarQueryTmp;
	+
	+ const messageInfosPromise: Promise<?FetchMessageInfosResult> = (async () => {
	+ if (threadIDsNeedingDetailedFetch.size === 0) {
	+ return undefined;
	+ }
	const threadCursors: { [string]: ?string } = {};
	for (const threadID of threadIDsNeedingDetailedFetch) {
	threadCursors[threadID] = null;
	@@ -435,11 +456,17 @@
	const messageSelectionCriteria: MessageSelectionCriteria = {
	threadCursors,
	};
	- promises.messageInfosResult = fetchMessageInfos(
	+ return await fetchMessageInfos(
	viewer,
	messageSelectionCriteria,
	defaultNumberPerThread,
	);
	+ })();
	+
	+ const calendarPromise: Promise<?FetchEntryInfosBase> = (async () => {
	+ if (threadIDsNeedingDetailedFetch.size === 0) {
	+ return undefined;
	+ }
	const threadCalendarQuery = {
	...calendarQuery,
	filters: [
	@@ -447,27 +474,31 @@
	{ type: 'threads', threadIDs: [...threadIDsNeedingDetailedFetch] },
	],
	};
	- promises.calendarResult = fetchEntryInfos(viewer, [threadCalendarQuery]);
	- }
	+ return await fetchEntryInfos(viewer, [threadCalendarQuery]);
	+ })();

	- if (entryIDsNeedingFetch.size > 0) {
	- promises.entryInfosResult = fetchEntryInfosByID(
	- viewer,
	- entryIDsNeedingFetch,
	- );
	- }
	-
	- if (currentUserNeedsFetch) {
	- promises.currentUserInfoResult = (async () => {
	- const currentUserInfo = await fetchCurrentUserInfo(viewer);
	- invariant(currentUserInfo.anonymous === undefined, 'should be logged in');
	- return currentUserInfo;
	- })();
	- }
	+ const entryInfosPromise: Promise<?RawEntryInfos> = (async () => {
	+ if (entryIDsNeedingFetch.size === 0) {
	+ return undefined;
	+ }
	+ return await fetchEntryInfosByID(viewer, entryIDsNeedingFetch);
	+ })();

	- if (userIDsToFetch.size > 0) {
	- promises.userInfosResult = fetchKnownUserInfos(viewer, [...userIDsToFetch]);
	- }
	+ const currentUserInfoPromise: Promise<?LoggedInUserInfo> = (async () => {
	+ if (!currentUserNeedsFetch) {
	+ return undefined;
	+ }
	+ const currentUserInfo = await fetchCurrentUserInfo(viewer);
	+ invariant(currentUserInfo.anonymous === undefined, 'should be logged in');
	+ return currentUserInfo;
	+ })();
	+
	+ const userInfosPromise: Promise<?UserInfos> = (async () => {
	+ if (userIDsToFetch.size === 0) {
	+ return undefined;
	+ }
	+ return await fetchKnownUserInfos(viewer, [...userIDsToFetch]);
	+ })();

	const {
	threadResult,
	@@ -476,7 +507,14 @@
	entryInfosResult,
	currentUserInfoResult,
	userInfosResult,
	- } = await promiseAll(promises);
	+ } = await promiseAll({
	+ threadResult: threadPromise,
	+ messageInfosResult: messageInfosPromise,
	+ calendarResult: calendarPromise,
	+ entryInfosResult: entryInfosPromise,
	+ currentUserInfoResult: currentUserInfoPromise,
	+ userInfosResult: userInfosPromise,
	+ });

	let threadInfos = {};
	if (viewerInfo.threadInfos) {
	diff --git a/keyserver/src/deleters/account-deleters.js b/keyserver/src/deleters/account-deleters.js
	--- a/keyserver/src/deleters/account-deleters.js
	+++ b/keyserver/src/deleters/account-deleters.js
	@@ -19,7 +19,7 @@
	import { rescindPushNotifs } from '../push/rescind.js';
	import { handleAsyncPromise } from '../responders/handlers.js';
	import { createNewAnonymousCookie } from '../session/cookies.js';
	-import type { Viewer } from '../session/viewer.js';
	+import type { Viewer, AnonymousViewerData } from '../session/viewer.js';
	import { fetchOlmAccount } from '../updaters/olm-account-updater.js';

	async function deleteAccount(viewer: Viewer): Promise<?LogOutResponse> {
	@@ -72,16 +72,23 @@
	COMMIT;
	`;

	- const promises = {};
	- promises.deletion = dbQuery(deletionQuery, { multipleStatements: true });
	- if (!viewer.isScriptViewer) {
	- promises.anonymousViewerData = createNewAnonymousCookie({
	- platformDetails: viewer.platformDetails,
	- deviceToken: viewer.deviceToken,
	- });
	- }
	- promises.username = fetchUsername(deletedUserID);
	- const { anonymousViewerData, username } = await promiseAll(promises);
	+ const deletionPromise = dbQuery(deletionQuery, { multipleStatements: true });
	+ const anonymousViewerDataPromise: Promise<?AnonymousViewerData> =
	+ (async () => {
	+ if (viewer.isScriptViewer) {
	+ return undefined;
	+ }
	+ return await createNewAnonymousCookie({
	+ platformDetails: viewer.platformDetails,
	+ deviceToken: viewer.deviceToken,
	+ });
	+ })();
	+ const usernamePromise = fetchUsername(deletedUserID);
	+ const { anonymousViewerData, username } = await promiseAll({
	+ anonymousViewerData: anonymousViewerDataPromise,
	+ username: usernamePromise,
	+ deletion: deletionPromise,
	+ });
	if (username) {
	const issuedAt = new Date().toISOString();
	const reservedUsernameMessage: ReservedUsernameMessage = {
	diff --git a/keyserver/src/fetchers/thread-fetchers.js b/keyserver/src/fetchers/thread-fetchers.js
	--- a/keyserver/src/fetchers/thread-fetchers.js
	+++ b/keyserver/src/fetchers/thread-fetchers.js
	@@ -244,7 +244,7 @@
	return { threadInfos };
	}

	-type FetchThreadInfosResult = {
	+export type FetchThreadInfosResult = {
	+threadInfos: RawThreadInfos,
	};

	diff --git a/keyserver/src/push/rescind.js b/keyserver/src/push/rescind.js
	--- a/keyserver/src/push/rescind.js
	+++ b/keyserver/src/push/rescind.js
	@@ -192,18 +192,28 @@
	}

	const numRescinds = Object.keys(deliveryPromises).length;
	- const promises = [promiseAll(deliveryPromises)];
	- if (numRescinds > 0) {
	- promises.push(createIDs('notifications', numRescinds));
	- }
	- if (rescindedIDs.length > 0) {
	+ const dbIDsPromise: Promise<?Array<string>> = (async () => {
	+ if (numRescinds === 0) {
	+ return undefined;
	+ }
	+ return await createIDs('notifications', numRescinds);
	+ })();
	+ const rescindPromise: Promise<mixed> = (async () => {
	+ if (rescindedIDs.length === 0) {
	+ return undefined;
	+ }
	const rescindQuery = SQL`
	UPDATE notifications SET rescinded = 1 WHERE id IN (${rescindedIDs})
	`;
	- promises.push(dbQuery(rescindQuery));
	- }
	+ return await dbQuery(rescindQuery);
	+ })();
	+
	+ const [deliveryResults, dbIDs] = await Promise.all([
	+ promiseAll(deliveryPromises),
	+ dbIDsPromise,
	+ rescindPromise,
	+ ]);

	- const [deliveryResults, dbIDs] = await Promise.all(promises);
	const newNotifRows = [];
	if (numRescinds > 0) {
	invariant(dbIDs, 'dbIDs should be set');
	diff --git a/keyserver/src/push/send.js b/keyserver/src/push/send.js
	--- a/keyserver/src/push/send.js
	+++ b/keyserver/src/push/send.js
	@@ -8,6 +8,7 @@
	import _groupBy from 'lodash/fp/groupBy.js';
	import _mapValues from 'lodash/fp/mapValues.js';
	import _pickBy from 'lodash/fp/pickBy.js';
	+import type { QueryResults } from 'mysql';
	import t from 'tcomb';
	import uuidv4 from 'uuid/v4.js';

	@@ -43,7 +44,6 @@
	import { type GlobalUserInfo } from 'lib/types/user-types.js';
	import { isDev } from 'lib/utils/dev-utils.js';
	import { values } from 'lib/utils/objects.js';
	-import { promiseAll } from 'lib/utils/promises.js';
	import { tID, tPlatformDetails, tShape } from 'lib/utils/validation-utils.js';

	import {
	@@ -693,10 +693,13 @@
	}
	}

	- const promises = {};
	// These threadInfos won't have currentUser set
	- promises.threadResult = fetchServerThreadInfos({ threadIDs });
	- if (threadWithChangedNamesToMessages.size > 0) {
	+ const threadPromise = fetchServerThreadInfos({ threadIDs });
	+
	+ const oldNamesPromise: Promise<?QueryResults> = (async () => {
	+ if (threadWithChangedNamesToMessages.size === 0) {
	+ return undefined;
	+ }
	const typesThatAffectName = [
	messageTypes.CHANGE_SETTINGS,
	messageTypes.CREATE_THREAD,
	@@ -725,10 +728,13 @@
	) x
	LEFT JOIN messages m ON m.id = x.id
	`);
	- promises.oldNames = dbQuery(oldNameQuery);
	- }
	+ return await dbQuery(oldNameQuery);
	+ })();

	- const { threadResult, oldNames } = await promiseAll(promises);
	+ const [threadResult, oldNames] = await Promise.all([
	+ threadPromise,
	+ oldNamesPromise,
	+ ]);
	const serverThreadInfos = threadResult.threadInfos;
	if (oldNames) {
	const [result] = oldNames;
	diff --git a/keyserver/src/responders/redux-state-responders.js b/keyserver/src/responders/redux-state-responders.js
	--- a/keyserver/src/responders/redux-state-responders.js
	+++ b/keyserver/src/responders/redux-state-responders.js
	@@ -24,6 +24,7 @@
	import {
	defaultNumberPerThread,
	messageStoreValidator,
	+ type MessageStore,
	} from 'lib/types/message-types.js';
	import { threadPermissions } from 'lib/types/thread-permission-types.js';
	import { threadTypes } from 'lib/types/thread-types-enum.js';
	@@ -172,7 +173,7 @@
	]);
	return { threadInfos: hasNotAcknowledgedPolicies ? {} : threadInfos };
	})();
	- const messageStorePromise = (async () => {
	+ const messageStorePromise: Promise<MessageStore> = (async () => {
	const [
	{ threadInfos },
	{ rawMessageInfos, truncationStatuses },
	@@ -306,7 +307,7 @@
	return hasNotAcknowledgedPolicies ? 0 : initialTime;
	})();

	- const pushApiPublicKeyPromise = (async () => {
	+ const pushApiPublicKeyPromise: Promise<?string> = (async () => {
	const pushConfig = await getWebPushConfig();
	if (!pushConfig) {
	if (process.env.NODE_ENV !== 'development') {
	diff --git a/keyserver/src/responders/user-responders.js b/keyserver/src/responders/user-responders.js
	--- a/keyserver/src/responders/user-responders.js
	+++ b/keyserver/src/responders/user-responders.js
	@@ -43,6 +43,7 @@
	import {
	type CalendarQuery,
	rawEntryInfoValidator,
	+ type FetchEntryInfosBase,
	} from 'lib/types/entry-types.js';
	import {
	defaultNumberPerThread,
	@@ -73,7 +74,6 @@
	} from 'lib/utils/crypto-utils.js';
	import { ServerError } from 'lib/utils/errors.js';
	import { values } from 'lib/utils/objects.js';
	-import { promiseAll } from 'lib/utils/promises.js';
	import {
	getPublicKeyFromSIWEStatement,
	isValidSIWEMessage,
	@@ -362,6 +362,13 @@
	}
	const messageSelectionCriteria = { threadCursors, joinedThreads: true };

	+ const entriesPromise: Promise<?FetchEntryInfosBase> = (async () => {
	+ if (!calendarQuery) {
	+ return undefined;
	+ }
	+ return await fetchEntryInfos(viewer, [calendarQuery]);
	+ })();
	+
	const [
	threadsResult,
	messagesResult,
	@@ -371,7 +378,7 @@
	] = await Promise.all([
	fetchThreadInfos(viewer),
	fetchMessageInfos(viewer, messageSelectionCriteria, defaultNumberPerThread),
	- calendarQuery ? fetchEntryInfos(viewer, [calendarQuery]) : undefined,
	+ entriesPromise,
	fetchKnownUserInfos(viewer),
	fetchLoggedInUserInfo(viewer),
	olmSessionPromise,
	@@ -455,11 +462,12 @@
	const calendarQuery = request.calendarQuery
	? normalizeCalendarQuery(request.calendarQuery)
	: null;
	- const promises = {};
	- if (calendarQuery) {
	- promises.verifyCalendarQueryThreadIDs =
	- verifyCalendarQueryThreadIDs(calendarQuery);
	- }
	+ const verifyCalendarQueryThreadIDsPromise = (async () => {
	+ if (calendarQuery) {
	+ await verifyCalendarQueryThreadIDs(calendarQuery);
	+ }
	+ })();
	+
	const username = request.username ?? request.usernameOrEmail;
	if (!username) {
	if (hasMinCodeVersion(viewer.platformDetails, { native: 150 })) {
	@@ -473,10 +481,11 @@
	FROM users
	WHERE LCASE(username) = LCASE(${username})
	`;
	- promises.userQuery = dbQuery(userQuery);
	- const {
	- userQuery: [userResult],
	- } = await promiseAll(promises);
	+ const userQueryPromise = dbQuery(userQuery);
	+ const [[userResult]] = await Promise.all([
	+ userQueryPromise,
	+ verifyCalendarQueryThreadIDsPromise,
	+ ]);

	if (userResult.length === 0) {
	if (hasMinCodeVersion(viewer.platformDetails, { native: 150 })) {
	diff --git a/keyserver/src/session/cookies.js b/keyserver/src/session/cookies.js
	--- a/keyserver/src/session/cookies.js
	+++ b/keyserver/src/session/cookies.js
	@@ -423,9 +423,15 @@
	}
	const deviceToken = result.type === 'invalidated' ? result.deviceToken : null;

	+ const deleteCookiePromise = (async () => {
	+ if (result.type === 'invalidated') {
	+ await deleteCookie(result.cookieID);
	+ }
	+ })();
	+
	const [anonymousViewerData] = await Promise.all([
	createNewAnonymousCookie({ platformDetails, deviceToken }),
	- result.type === 'invalidated' ? deleteCookie(result.cookieID) : null,
	+ deleteCookiePromise,
	]);

	return createViewerForInvalidFetchViewerResult(result, anonymousViewerData);
	diff --git a/keyserver/src/socket/socket.js b/keyserver/src/socket/socket.js
	--- a/keyserver/src/socket/socket.js
	+++ b/keyserver/src/socket/socket.js
	@@ -426,7 +426,7 @@
	async handleClientSocketMessage(
	message: ClientSocketMessage,
	): Promise<ServerServerSocketMessage[]> {
	- const resultPromise = (async () => {
	+ const resultPromise: Promise<ServerServerSocketMessage[]> = (async () => {
	if (message.type === clientSocketMessageTypes.INITIAL) {
	this.markActivityOccurred();
	return await this.handleInitialClientSocketMessage(message);
	@@ -444,7 +444,7 @@
	}
	return [];
	})();
	- const timeoutPromise = (async () => {
	+ const timeoutPromise: Promise<empty> = (async () => {
	await sleep(serverResponseTimeout);
	throw new ServerError('socket_response_timeout');
	})();
	@@ -553,18 +553,19 @@
	const { sessionUpdate, deltaEntryInfoResult } =
	sessionInitializationResult;

	- const promises = {};
	- promises.deleteExpiredUpdates = deleteUpdatesBeforeTimeTargetingSession(
	- viewer,
	- oldUpdatesCurrentAsOf,
	- );
	- promises.fetchUpdateResult = fetchUpdateInfos(
	+ const deleteExpiredUpdatesPromise =
	+ deleteUpdatesBeforeTimeTargetingSession(viewer, oldUpdatesCurrentAsOf);
	+ const fetchUpdateResultPromise = fetchUpdateInfos(
	viewer,
	oldUpdatesCurrentAsOf,
	calendarQuery,
	);
	- promises.sessionUpdate = commitSessionUpdate(viewer, sessionUpdate);
	- const { fetchUpdateResult } = await promiseAll(promises);
	+ const sessionUpdatePromise = commitSessionUpdate(viewer, sessionUpdate);
	+ const [fetchUpdateResult] = await Promise.all([
	+ fetchUpdateResultPromise,
	+ deleteExpiredUpdatesPromise,
	+ sessionUpdatePromise,
	+ ]);

	const { updateInfos, userInfos } = fetchUpdateResult;
	const newUpdatesCurrentAsOf = mostRecentUpdateTimestamp(
	diff --git a/keyserver/src/updaters/thread-permission-updaters.js b/keyserver/src/updaters/thread-permission-updaters.js
	--- a/keyserver/src/updaters/thread-permission-updaters.js
	+++ b/keyserver/src/updaters/thread-permission-updaters.js
	@@ -122,6 +122,19 @@
	INNER JOIN memberships cm ON cm.thread = t.containing_thread_id
	WHERE t.id = ${threadID} AND cm.user IN (${userIDs})
	`;
	+ const containingMembershipPromise: Promise<
	+ $ReadOnlyArray<{
	+ +user: number,
	+ +containing_role: number,
	+ }>,
	+ > = (async () => {
	+ if (intent === 'leave') {
	+ // Membership in the container only needs to be checked for members
	+ return [];
	+ }
	+ const [result] = await dbQuery(containingMembershipQuery);
	+ return result;
	+ })();
	const [
	[membershipResults],
	[parentMembershipResults],
	@@ -130,14 +143,7 @@
	] = await Promise.all([
	dbQuery(membershipQuery),
	dbQuery(parentMembershipQuery),
	- (async () => {
	- if (intent === 'leave') {
	- // Membership in the container only needs to be checked for members
	- return [];
	- }
	- const [result] = await dbQuery(containingMembershipQuery);
	- return result;
	- })(),
	+ containingMembershipPromise,
	changeRoleThreadQuery(threadID, role),
	]);

	diff --git a/keyserver/src/updaters/thread-updaters.js b/keyserver/src/updaters/thread-updaters.js
	--- a/keyserver/src/updaters/thread-updaters.js
	+++ b/keyserver/src/updaters/thread-updaters.js
	@@ -40,6 +40,7 @@
	changeRole,
	recalculateThreadPermissions,
	commitMembershipChangeset,
	+ type MembershipChangeset,
	type MembershipRow,
	} from './thread-permission-updaters.js';
	import createMessages from '../creators/message-creator.js';
	@@ -343,7 +344,6 @@
	const silenceMessages = options?.silenceMessages ?? false;
	const ignorePermissions =
	(options?.ignorePermissions && viewer.isScriptViewer) ?? false;
	- const validationPromises = {};

	const changedFields: { [string]: string \| number } = {};
	const sqlUpdate: { [string]: ?string \| number } = {};
	@@ -354,12 +354,12 @@
	throw new ServerError('invalid_chat_name');
	}
	changedFields.name = name;
	- sqlUpdate.name = name ?? null;
	+ sqlUpdate.name = name;
	}
	const { description } = request.changes;
	if (description !== undefined && description !== null) {
	changedFields.description = description;
	- sqlUpdate.description = description ?? null;
	+ sqlUpdate.description;
	}
	if (request.changes.color) {
	const color = request.changes.color.toLowerCase();
	@@ -408,11 +408,11 @@
	throw new ServerError('invalid_parameters');
	}

	- validationPromises.serverThreadInfos = fetchServerThreadInfos({
	+ const serverThreadInfosPromise = fetchServerThreadInfos({
	threadID: request.threadID,
	});

	- validationPromises.hasNecessaryPermissions = (async () => {
	+ const hasNecessaryPermissionsPromise = (async () => {
	if (ignorePermissions) {
	return;
	}
	@@ -463,7 +463,10 @@
	}
	})();

	- const { serverThreadInfos } = await promiseAll(validationPromises);
	+ const [serverThreadInfos] = await Promise.all([
	+ serverThreadInfosPromise,
	+ hasNecessaryPermissionsPromise,
	+ ]);

	const serverThreadInfo = serverThreadInfos.threadInfos[request.threadID];
	if (!serverThreadInfo) {
	@@ -704,30 +707,35 @@
	}
	})();

	- const intermediatePromises = {};
	- intermediatePromises.updateQuery = updateQueryPromise;
	- intermediatePromises.updateRoles = updateRolesPromise;
	-
	- if (newMemberIDs) {
	- intermediatePromises.addMembersChangeset = (async () => {
	+ const addMembersChangesetPromise: Promise<?MembershipChangeset> =
	+ (async () => {
	+ if (!newMemberIDs) {
	+ return undefined;
	+ }
	await Promise.all([updateQueryPromise, updateRolesPromise]);
	return await changeRole(request.threadID, newMemberIDs, null, {
	setNewMembersToUnread: true,
	});
	})();
	- }

	- const threadRootChanged =
	- rolesNeedUpdate \|\| nextParentThreadID !== oldParentThreadID;
	- if (threadRootChanged) {
	- intermediatePromises.recalculatePermissionsChangeset = (async () => {
	+ const recalculatePermissionsChangesetPromise: Promise<?MembershipChangeset> =
	+ (async () => {
	+ const threadRootChanged =
	+ rolesNeedUpdate \|\| nextParentThreadID !== oldParentThreadID;
	+ if (!threadRootChanged) {
	+ return undefined;
	+ }
	await Promise.all([updateQueryPromise, updateRolesPromise]);
	return await recalculateThreadPermissions(request.threadID);
	})();
	- }

	- const { addMembersChangeset, recalculatePermissionsChangeset } =
	- await promiseAll(intermediatePromises);
	+ const [addMembersChangeset, recalculatePermissionsChangeset] =
	+ await Promise.all([
	+ addMembersChangesetPromise,
	+ recalculatePermissionsChangesetPromise,
	+ updateQueryPromise,
	+ updateRolesPromise,
	+ ]);

	const membershipRows: Array<MembershipRow> = [];
	const relationshipChangeset = new RelationshipChangeset();

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