diff --git a/lib/types/messages/create-sidebar.js b/lib/types/messages/create-sidebar.js
index 05e3545e5..07ec00dc0 100644
--- a/lib/types/messages/create-sidebar.js
+++ b/lib/types/messages/create-sidebar.js
@@ -1,58 +1,58 @@
 // @flow
 
 import t, { type TInterface } from 'tcomb';
 
 import { tID, tNumber, tShape, tUserID } from '../../utils/validation-utils.js';
 import { messageTypes } from '../message-types-enum.js';
 import type { ThreadInfo } from '../minimally-encoded-thread-permissions-types.js';
 import type { RelativeUserInfo } from '../user-types.js';
 
 export type CreateSidebarMessageData = {
   +type: 18,
   +threadID: string,
   +creatorID: string,
   +time: number,
   +sourceMessageAuthorID: string,
   +initialThreadState: {
-    +name: ?string,
+    +name?: ?string,
     +parentThreadID: string,
     +color: string,
     +memberIDs: string[],
   },
 };
 
 export type RawCreateSidebarMessageInfo = {
   ...CreateSidebarMessageData,
   id: string,
 };
 
 export const rawCreateSidebarMessageInfoValidator: TInterface<RawCreateSidebarMessageInfo> =
   tShape<RawCreateSidebarMessageInfo>({
     type: tNumber(messageTypes.CREATE_SIDEBAR),
     threadID: tID,
     creatorID: tUserID,
     time: t.Number,
     sourceMessageAuthorID: tUserID,
     initialThreadState: tShape({
       name: t.maybe(t.String),
       parentThreadID: tID,
       color: t.String,
       memberIDs: t.list(tUserID),
     }),
     id: tID,
   });
 
 export type CreateSidebarMessageInfo = {
   +type: 18,
   +id: string,
   +threadID: string,
   +creator: RelativeUserInfo,
   +time: number,
   +sourceMessageAuthor: RelativeUserInfo,
   +initialThreadState: {
-    +name: ?string,
+    +name?: ?string,
     +parentThreadInfo: ThreadInfo,
     +color: string,
     +otherMembers: RelativeUserInfo[],
   },
 };
diff --git a/lib/types/messages/create-thread.js b/lib/types/messages/create-thread.js
index 1d2907c9a..75d508360 100644
--- a/lib/types/messages/create-thread.js
+++ b/lib/types/messages/create-thread.js
@@ -1,66 +1,66 @@
 // @flow
 
 import t, { type TInterface } from 'tcomb';
 
 import { values } from '../../utils/objects.js';
 import {
   tID,
   tNumber,
   tNumEnum,
   tShape,
   tUserID,
 } from '../../utils/validation-utils.js';
 import { messageTypes } from '../message-types-enum.js';
 import type { ThreadInfo } from '../minimally-encoded-thread-permissions-types.js';
 import { type ThreadType, threadTypes } from '../thread-types-enum.js';
 import type { RelativeUserInfo } from '../user-types.js';
 
 export type CreateThreadMessageData = {
   type: 1,
   threadID: string,
   creatorID: string,
   time: number,
   initialThreadState: {
     type: ThreadType,
-    name: ?string,
-    parentThreadID: ?string,
+    name?: ?string,
+    parentThreadID?: ?string,
     color: string,
     memberIDs: string[],
   },
 };
 
 export type RawCreateThreadMessageInfo = {
   ...CreateThreadMessageData,
   id: string,
 };
 
 export const rawCreateThreadMessageInfoValidator: TInterface<RawCreateThreadMessageInfo> =
   tShape<RawCreateThreadMessageInfo>({
     type: tNumber(messageTypes.CREATE_THREAD),
     threadID: tID,
     creatorID: tUserID,
     time: t.Number,
     initialThreadState: tShape({
       type: tNumEnum(values(threadTypes)),
       name: t.maybe(t.String),
       parentThreadID: t.maybe(tID),
       color: t.String,
       memberIDs: t.list(tUserID),
     }),
     id: tID,
   });
 
 export type CreateThreadMessageInfo = {
   type: 1,
   id: string,
   threadID: string,
   creator: RelativeUserInfo,
   time: number,
   initialThreadState: {
     type: ThreadType,
-    name: ?string,
-    parentThreadInfo: ?ThreadInfo,
+    name?: ?string,
+    parentThreadInfo?: ?ThreadInfo,
     color: string,
     otherMembers: RelativeUserInfo[],
   },
 };
diff --git a/lib/types/thread-types.js b/lib/types/thread-types.js
index 544d706cb..252c04a4a 100644
--- a/lib/types/thread-types.js
+++ b/lib/types/thread-types.js
@@ -1,468 +1,468 @@
 // @flow
 
 import t, { type TInterface } from 'tcomb';
 
 import {
   type AvatarDBContent,
   type ClientAvatar,
   clientAvatarValidator,
   type UpdateUserAvatarRequest,
 } from './avatar-types.js';
 import type { CalendarQuery } from './entry-types.js';
 import type { Media } from './media-types.js';
 import type {
   MessageTruncationStatuses,
   RawMessageInfo,
 } from './message-types.js';
 import type {
   RawThreadInfo,
   ResolvedThreadInfo,
   ThreadInfo,
 } from './minimally-encoded-thread-permissions-types.js';
 import {
   type ThreadSubscription,
   threadSubscriptionValidator,
 } from './subscription-types.js';
 import {
   type ThreadPermissionsInfo,
   threadPermissionsInfoValidator,
   type ThreadRolePermissionsBlob,
   threadRolePermissionsBlobValidator,
   type UserSurfacedPermission,
 } from './thread-permission-types.js';
 import {
   type ThreadType,
   type ThinThreadType,
   type ThickThreadType,
   threadTypeValidator,
 } from './thread-types-enum.js';
 import type { ClientUpdateInfo, ServerUpdateInfo } from './update-types.js';
 import type { UserInfo, UserInfos } from './user-types.js';
 import type { SpecialRole } from '../permissions/special-roles.js';
 import { type ThreadEntity } from '../utils/entity-text.js';
 import { tID, tShape, tUserID } from '../utils/validation-utils.js';
 
 export type LegacyMemberInfo = {
   +id: string,
   +role: ?string,
   +permissions: ThreadPermissionsInfo,
   +isSender: boolean,
 };
 export const legacyMemberInfoValidator: TInterface<LegacyMemberInfo> =
   tShape<LegacyMemberInfo>({
     id: tUserID,
     role: t.maybe(tID),
     permissions: threadPermissionsInfoValidator,
     isSender: t.Boolean,
   });
 
 export type ClientLegacyRoleInfo = {
   +id: string,
   +name: string,
   +permissions: ThreadRolePermissionsBlob,
   +isDefault: boolean,
 };
 export const clientLegacyRoleInfoValidator: TInterface<ClientLegacyRoleInfo> =
   tShape<ClientLegacyRoleInfo>({
     id: tID,
     name: t.String,
     permissions: threadRolePermissionsBlobValidator,
     isDefault: t.Boolean,
   });
 
 export type ServerLegacyRoleInfo = {
   +id: string,
   +name: string,
   +permissions: ThreadRolePermissionsBlob,
   +isDefault: boolean,
   +specialRole: ?SpecialRole,
 };
 
 export type LegacyThreadCurrentUserInfo = {
   +role: ?string,
   +permissions: ThreadPermissionsInfo,
   +subscription: ThreadSubscription,
   +unread: ?boolean,
 };
 export const legacyThreadCurrentUserInfoValidator: TInterface<LegacyThreadCurrentUserInfo> =
   tShape<LegacyThreadCurrentUserInfo>({
     role: t.maybe(tID),
     permissions: threadPermissionsInfoValidator,
     subscription: threadSubscriptionValidator,
     unread: t.maybe(t.Boolean),
   });
 
 export type LegacyThinRawThreadInfo = {
   +id: string,
   +type: ThinThreadType,
-  +name: ?string,
+  +name?: ?string,
   +avatar?: ?ClientAvatar,
-  +description: ?string,
+  +description?: ?string,
   +color: string, // hex, without "#" or "0x"
   +creationTime: number, // millisecond timestamp
   +parentThreadID: ?string,
-  +containingThreadID: ?string,
+  +containingThreadID?: ?string,
   +community: ?string,
   +members: $ReadOnlyArray<LegacyMemberInfo>,
   +roles: { +[id: string]: ClientLegacyRoleInfo },
   +currentUser: LegacyThreadCurrentUserInfo,
   +sourceMessageID?: string,
   +repliesCount: number,
   +pinnedCount?: number,
 };
 
 export type ThickMemberInfo = {
   +id: string,
   +role: ?string,
   +permissions: ThreadPermissionsInfo,
   +subscription: ThreadSubscription,
   +isSender: boolean,
 };
 
 export type LegacyThickRawThreadInfo = {
   +thick: true,
   +id: string,
   +type: ThickThreadType,
-  +name: ?string,
+  +name?: ?string,
   +avatar?: ?ClientAvatar,
-  +description: ?string,
+  +description?: ?string,
   +color: string, // hex, without "#" or "0x"
   +creationTime: number, // millisecond timestamp
-  +parentThreadID: ?string,
-  +containingThreadID: ?string,
-  +community: ?string,
+  +parentThreadID?: ?string,
+  +containingThreadID?: ?string,
+  +community?: ?string,
   +members: $ReadOnlyArray<ThickMemberInfo>,
   +roles: { +[id: string]: ClientLegacyRoleInfo },
   +currentUser: LegacyThreadCurrentUserInfo,
   +sourceMessageID?: string,
   +repliesCount: number,
   +pinnedCount?: number,
 };
 
 export type LegacyRawThreadInfo =
   | LegacyThinRawThreadInfo
   | LegacyThickRawThreadInfo;
 
 export type LegacyRawThreadInfos = {
   +[id: string]: LegacyRawThreadInfo,
 };
 export const legacyRawThreadInfoValidator: TInterface<LegacyRawThreadInfo> =
   tShape<LegacyRawThreadInfo>({
     id: tID,
     type: threadTypeValidator,
     name: t.maybe(t.String),
     avatar: t.maybe(clientAvatarValidator),
     description: t.maybe(t.String),
     color: t.String,
     creationTime: t.Number,
     parentThreadID: t.maybe(tID),
     containingThreadID: t.maybe(tID),
     community: t.maybe(tID),
     members: t.list(legacyMemberInfoValidator),
     roles: t.dict(tID, clientLegacyRoleInfoValidator),
     currentUser: legacyThreadCurrentUserInfoValidator,
     sourceMessageID: t.maybe(tID),
     repliesCount: t.Number,
     pinnedCount: t.maybe(t.Number),
   });
 
 export type MixedRawThreadInfos = {
   +[id: string]: LegacyRawThreadInfo | RawThreadInfo,
 };
 export type RawThreadInfos = {
   +[id: string]: RawThreadInfo,
 };
 
 export type ServerMemberInfo = {
   +id: string,
   +role: ?string,
   +permissions: ThreadPermissionsInfo,
   +subscription: ThreadSubscription,
   +unread: ?boolean,
   +isSender: boolean,
 };
 
 export type ServerThreadInfo = {
   +id: string,
   +type: ThreadType,
   +name: ?string,
   +avatar?: AvatarDBContent,
   +description: ?string,
   +color: string, // hex, without "#" or "0x"
   +creationTime: number, // millisecond timestamp
   +parentThreadID: ?string,
   +containingThreadID: ?string,
   +community: ?string,
   +depth: number,
   +members: $ReadOnlyArray<ServerMemberInfo>,
   +roles: { +[id: string]: ServerLegacyRoleInfo },
   +sourceMessageID?: string,
   +repliesCount: number,
   +pinnedCount: number,
 };
 
 export type LegacyThreadStore = {
   +threadInfos: MixedRawThreadInfos,
 };
 
 export type ThreadStore = {
   +threadInfos: RawThreadInfos,
 };
 
 export type ClientDBThreadInfo = {
   +id: string,
   +type: number,
   +name: ?string,
   +avatar?: ?string,
   +description: ?string,
   +color: string,
   +creationTime: string,
   +parentThreadID: ?string,
   +containingThreadID: ?string,
   +community: ?string,
   +members: string,
   +roles: string,
   +currentUser: string,
   +sourceMessageID?: string,
   +repliesCount: number,
   +pinnedCount?: number,
 };
 
 export type ThreadDeletionRequest = {
   +threadID: string,
   +accountPassword?: empty,
 };
 
 export type RemoveMembersRequest = {
   +threadID: string,
   +memberIDs: $ReadOnlyArray<string>,
 };
 
 export type RoleChangeRequest = {
   +threadID: string,
   +memberIDs: $ReadOnlyArray<string>,
   +role: string,
 };
 
 export type ChangeThreadSettingsResult = {
   +updatesResult: {
     +newUpdates: $ReadOnlyArray<ServerUpdateInfo>,
   },
   +newMessageInfos: $ReadOnlyArray<RawMessageInfo>,
 };
 
 export type ChangeThreadSettingsPayload = {
   +threadID: string,
   +updatesResult: {
     +newUpdates: $ReadOnlyArray<ClientUpdateInfo>,
   },
   +newMessageInfos: $ReadOnlyArray<RawMessageInfo>,
 };
 
 export type LeaveThreadRequest = {
   +threadID: string,
 };
 export type LeaveThreadResult = {
   +updatesResult: {
     +newUpdates: $ReadOnlyArray<ServerUpdateInfo>,
   },
 };
 
 export type LeaveThreadPayload = {
   +updatesResult: {
     +newUpdates: $ReadOnlyArray<ClientUpdateInfo>,
   },
 };
 
 export type ThreadChanges = Partial<{
   +type: ThreadType,
   +name: string,
   +description: string,
   +color: string,
   +parentThreadID: ?string,
   +newMemberIDs: $ReadOnlyArray<string>,
   +avatar: UpdateUserAvatarRequest,
 }>;
 
 export type UpdateThreadRequest = {
   +threadID: string,
   +changes: ThreadChanges,
   +accountPassword?: empty,
 };
 
 export type BaseNewThreadRequest = {
   +id?: ?string,
   +name?: ?string,
   +description?: ?string,
   +color?: ?string,
   +parentThreadID?: ?string,
   +initialMemberIDs?: ?$ReadOnlyArray<string>,
   +ghostMemberIDs?: ?$ReadOnlyArray<string>,
 };
 type NewThinThreadRequest =
   | {
       +type: 3 | 4 | 6 | 7 | 8 | 9 | 10 | 11 | 12,
       ...BaseNewThreadRequest,
     }
   | {
       +type: 5,
       +sourceMessageID: string,
       ...BaseNewThreadRequest,
     };
 
 export type ClientNewThinThreadRequest = {
   ...NewThinThreadRequest,
   +calendarQuery: CalendarQuery,
 };
 export type ServerNewThinThreadRequest = {
   ...NewThinThreadRequest,
   +calendarQuery?: ?CalendarQuery,
 };
 
 export type NewThreadResponse = {
   +updatesResult: {
     +newUpdates: $ReadOnlyArray<ServerUpdateInfo>,
   },
   +newMessageInfos: $ReadOnlyArray<RawMessageInfo>,
   +userInfos: UserInfos,
   +newThreadID: string,
 };
 export type NewThreadResult = {
   +updatesResult: {
     +newUpdates: $ReadOnlyArray<ClientUpdateInfo>,
   },
   +newMessageInfos: $ReadOnlyArray<RawMessageInfo>,
   +userInfos: UserInfos,
   +newThreadID: string,
 };
 
 export type ServerThreadJoinRequest = {
   +threadID: string,
   +calendarQuery?: ?CalendarQuery,
   +inviteLinkSecret?: string,
   +defaultSubscription?: ThreadSubscription,
 };
 export type ClientThreadJoinRequest = {
   +threadID: string,
   +calendarQuery: CalendarQuery,
   +inviteLinkSecret?: string,
   +defaultSubscription?: ThreadSubscription,
 };
 export type ThreadJoinResult = {
   +updatesResult: {
     +newUpdates: $ReadOnlyArray<ServerUpdateInfo>,
   },
   +rawMessageInfos: $ReadOnlyArray<RawMessageInfo>,
   +truncationStatuses: MessageTruncationStatuses,
   +userInfos: UserInfos,
 };
 export type ThreadJoinPayload = {
   +updatesResult: {
     newUpdates: $ReadOnlyArray<ClientUpdateInfo>,
   },
   +rawMessageInfos: $ReadOnlyArray<RawMessageInfo>,
   +truncationStatuses: MessageTruncationStatuses,
   +userInfos: $ReadOnlyArray<UserInfo>,
   +keyserverID: string,
 };
 
 export type ThreadFetchMediaResult = {
   +media: $ReadOnlyArray<Media>,
 };
 export type ThreadFetchMediaRequest = {
   +threadID: string,
   +limit: number,
   +offset: number,
 };
 
 export type SidebarInfo = {
   +threadInfo: ThreadInfo,
   +lastUpdatedTime: number,
   +mostRecentNonLocalMessage: ?string,
 };
 
 export type ToggleMessagePinRequest = {
   +messageID: string,
   +action: 'pin' | 'unpin',
 };
 
 export type ToggleMessagePinResult = {
   +newMessageInfos: $ReadOnlyArray<RawMessageInfo>,
   +threadID: string,
 };
 
 type CreateRoleAction = {
   +community: string,
   +name: string,
   +permissions: $ReadOnlyArray<UserSurfacedPermission>,
   +action: 'create_role',
 };
 
 type EditRoleAction = {
   +community: string,
   +existingRoleID: string,
   +name: string,
   +permissions: $ReadOnlyArray<UserSurfacedPermission>,
   +action: 'edit_role',
 };
 
 export type RoleModificationRequest = CreateRoleAction | EditRoleAction;
 
 export type RoleModificationResult = {
   +threadInfo: LegacyRawThreadInfo | RawThreadInfo,
   +updatesResult: {
     +newUpdates: $ReadOnlyArray<ServerUpdateInfo>,
   },
 };
 
 export type RoleModificationPayload = {
   +threadInfo: LegacyRawThreadInfo | RawThreadInfo,
   +updatesResult: {
     +newUpdates: $ReadOnlyArray<ClientUpdateInfo>,
   },
 };
 
 export type RoleDeletionRequest = {
   +community: string,
   +roleID: string,
 };
 
 export type RoleDeletionResult = {
   +threadInfo: LegacyRawThreadInfo | RawThreadInfo,
   +updatesResult: {
     +newUpdates: $ReadOnlyArray<ServerUpdateInfo>,
   },
 };
 
 export type RoleDeletionPayload = {
   +threadInfo: LegacyRawThreadInfo | RawThreadInfo,
   +updatesResult: {
     +newUpdates: $ReadOnlyArray<ClientUpdateInfo>,
   },
 };
 
 // We can show a max of 3 sidebars inline underneath their parent in the chat
 // tab. If there are more, we show a button that opens a modal to see the rest
 export const maxReadSidebars = 3;
 
 // We can show a max of 5 sidebars inline underneath their parent
 // in the chat tab if every one of the displayed sidebars is unread
 export const maxUnreadSidebars = 5;
 
 export type ThreadStoreThreadInfos = LegacyRawThreadInfos;
 
 export type ChatMentionCandidate = {
   +threadInfo: ResolvedThreadInfo,
   +rawChatName: string | ThreadEntity,
 };
 export type ChatMentionCandidates = {
   +[id: string]: ChatMentionCandidate,
 };
 export type ChatMentionCandidatesObj = {
   +[id: string]: ChatMentionCandidates,
 };
 
 export type UserProfileThreadInfo = {
   +threadInfo: ThreadInfo,
   +pendingPersonalThreadUserInfo?: UserInfo,
 };