diff --git a/lib/shared/dm-ops/update-relationship-spec.js b/lib/shared/dm-ops/update-relationship-spec.js
index 8e2d36798..fa444f7ed 100644
--- a/lib/shared/dm-ops/update-relationship-spec.js
+++ b/lib/shared/dm-ops/update-relationship-spec.js
@@ -1,109 +1,110 @@
 // @flow
 
 import type {
   DMOperationSpec,
   ProcessDMOperationUtilities,
 } from './dm-op-spec.js';
 import type { DMUpdateRelationshipOperation } from '../../types/dm-ops.js';
 import { messageTypes } from '../../types/message-types-enum.js';
 import { rawMessageInfoFromMessageData } from '../message-utils.js';
 
 async function createMessageDataWithInfoFromDMOperation(
   dmOperation: DMUpdateRelationshipOperation,
   utilities: ProcessDMOperationUtilities,
 ) {
-  const { threadID, creatorID, time, operation, messageID } = dmOperation;
-  const { viewerID, findUserIdentities } = utilities;
+  const { threadID, creatorID, time, operation, messageID, targetUserID } =
+    dmOperation;
+  const { findUserIdentities } = utilities;
   if (operation !== 'farcaster_mutual') {
     const messageData = {
       type: messageTypes.UPDATE_RELATIONSHIP,
       threadID,
       creatorID,
-      targetID: viewerID,
+      targetID: targetUserID,
       time,
       operation,
     };
     const rawMessageInfo = rawMessageInfoFromMessageData(
       messageData,
       messageID,
     );
     return { rawMessageInfo, messageData };
   }
   const { identities: userIdentities } = await findUserIdentities([
     creatorID,
-    viewerID,
+    targetUserID,
   ]);
   const creatorFID = userIdentities[creatorID]?.farcasterID;
-  const targetFID = userIdentities[viewerID]?.farcasterID;
+  const targetFID = userIdentities[targetUserID]?.farcasterID;
   if (!creatorFID || !targetFID) {
-    const errorMap = { creatorID: creatorFID, viewerID: targetFID };
+    const errorMap = { [creatorID]: creatorFID, [targetUserID]: targetFID };
     throw new Error(
       'could not fetch FID for either creator or target: ' +
         JSON.stringify(errorMap),
     );
   }
   const messageData = {
     type: messageTypes.UPDATE_RELATIONSHIP,
     threadID,
     creatorID,
     creatorFID,
-    targetID: viewerID,
+    targetID: targetUserID,
     targetFID,
     time,
     operation,
   };
   const rawMessageInfo = rawMessageInfoFromMessageData(messageData, messageID);
   return { rawMessageInfo, messageData };
 }
 
 const updateRelationshipSpec: DMOperationSpec<DMUpdateRelationshipOperation> =
   Object.freeze({
     notificationsCreationData: async (
       dmOperation: DMUpdateRelationshipOperation,
       utilities: ProcessDMOperationUtilities,
     ) => {
       const messageDataWithMessageInfo =
         await createMessageDataWithInfoFromDMOperation(
           dmOperation,
 
           utilities,
         );
       return {
         messageDatasWithMessageInfos: [messageDataWithMessageInfo],
       };
     },
     processDMOperation: async (
       dmOperation: DMUpdateRelationshipOperation,
       utilities: ProcessDMOperationUtilities,
     ) => {
       const { rawMessageInfo } = await createMessageDataWithInfoFromDMOperation(
         dmOperation,
         utilities,
       );
       const rawMessageInfos = [rawMessageInfo];
       return {
         rawMessageInfos,
         updateInfos: [],
         blobOps: [],
       };
     },
     canBeProcessed: async (
       dmOperation: DMUpdateRelationshipOperation,
       utilities: ProcessDMOperationUtilities,
     ) => {
       try {
         await createMessageDataWithInfoFromDMOperation(dmOperation, utilities);
         return {
           isProcessingPossible: true,
         };
       } catch (e) {
         return {
           isProcessingPossible: false,
           reason: { type: 'invalid' },
         };
       }
     },
     supportsAutoRetry: true,
   });
 
 export { updateRelationshipSpec };
diff --git a/lib/types/dm-ops.js b/lib/types/dm-ops.js
index 4f4bb5162..3824b8eaa 100644
--- a/lib/types/dm-ops.js
+++ b/lib/types/dm-ops.js
@@ -1,608 +1,610 @@
 // @flow
 
 import t, { type TInterface, type TUnion } from 'tcomb';
 
 import { clientAvatarValidator, type ClientAvatar } from './avatar-types.js';
 import type { BlobOperation } from './holder-types.js';
 import { type Media, mediaValidator } from './media-types.js';
 import type { RawMessageInfo } from './message-types.js';
 import type { RelationshipOperation } from './messages/update-relationship.js';
 import type { NotificationsCreationData } from './notif-types.js';
 import type { OutboundP2PMessage } from './sqlite-types.js';
 import {
   type ThreadSubscription,
   threadSubscriptionValidator,
 } from './subscription-types.js';
 import {
   type NonSidebarThickThreadType,
   nonSidebarThickThreadTypes,
   type ThickThreadType,
   thickThreadTypeValidator,
 } from './thread-types-enum.js';
 import {
   threadTimestampsValidator,
   type ThreadTimestamps,
 } from './thread-types.js';
 import type { ClientUpdateInfo } from './update-types.js';
 import { values } from '../utils/objects.js';
 import { tColor, tShape, tString, tUserID } from '../utils/validation-utils.js';
 
 export const dmOperationTypes = Object.freeze({
   CREATE_THREAD: 'create_thread',
   CREATE_SIDEBAR: 'create_sidebar',
   SEND_TEXT_MESSAGE: 'send_text_message',
   SEND_MULTIMEDIA_MESSAGE: 'send_multimedia_message',
   SEND_REACTION_MESSAGE: 'send_reaction_message',
   SEND_EDIT_MESSAGE: 'send_edit_message',
   ADD_MEMBERS: 'add_members',
   ADD_VIEWER_TO_THREAD_MEMBERS: 'add_viewer_to_thread_members',
   JOIN_THREAD: 'join_thread',
   LEAVE_THREAD: 'leave_thread',
   REMOVE_MEMBERS: 'remove_members',
   CHANGE_THREAD_SETTINGS: 'change_thread_settings',
   CHANGE_THREAD_SUBSCRIPTION: 'change_thread_subscription',
   CHANGE_THREAD_READ_STATUS: 'change_thread_read_status',
   CREATE_ENTRY: 'create_entry',
   DELETE_ENTRY: 'delete_entry',
   EDIT_ENTRY: 'edit_entry',
   UPDATE_RELATIONSHIP: 'update_relationship',
 });
 export type DMOperationType = $Values<typeof dmOperationTypes>;
 
 type MemberIDWithSubscription = {
   +id: string,
   +subscription: ThreadSubscription,
 };
 export const memberIDWithSubscriptionValidator: TInterface<MemberIDWithSubscription> =
   tShape<MemberIDWithSubscription>({
     id: tUserID,
     subscription: threadSubscriptionValidator,
   });
 
 export type CreateThickRawThreadInfoInput = {
   +threadID: string,
   +threadType: ThickThreadType,
   +creationTime: number,
   +parentThreadID?: ?string,
   +allMemberIDsWithSubscriptions: $ReadOnlyArray<MemberIDWithSubscription>,
   +roleID: string,
   +unread: boolean,
   +timestamps: ThreadTimestamps,
   +name?: ?string,
   +avatar?: ?ClientAvatar,
   +description?: ?string,
   +color?: ?string,
   +containingThreadID?: ?string,
   +sourceMessageID?: ?string,
   +repliesCount?: ?number,
   +pinnedCount?: ?number,
 };
 export const createThickRawThreadInfoInputValidator: TInterface<CreateThickRawThreadInfoInput> =
   tShape<CreateThickRawThreadInfoInput>({
     threadID: t.String,
     threadType: thickThreadTypeValidator,
     creationTime: t.Number,
     parentThreadID: t.maybe(t.String),
     allMemberIDsWithSubscriptions: t.list(memberIDWithSubscriptionValidator),
     roleID: t.String,
     unread: t.Boolean,
     timestamps: threadTimestampsValidator,
     name: t.maybe(t.String),
     avatar: t.maybe(clientAvatarValidator),
     description: t.maybe(t.String),
     color: t.maybe(t.String),
     containingThreadID: t.maybe(t.String),
     sourceMessageID: t.maybe(t.String),
     repliesCount: t.maybe(t.Number),
     pinnedCount: t.maybe(t.Number),
   });
 
 export type DMCreateThreadOperation = {
   +type: 'create_thread',
   +threadID: string,
   +creatorID: string,
   +time: number,
   +threadType: NonSidebarThickThreadType,
   +memberIDs: $ReadOnlyArray<string>,
   +roleID: string,
   +newMessageID: string,
 };
 export const dmCreateThreadOperationValidator: TInterface<DMCreateThreadOperation> =
   tShape<DMCreateThreadOperation>({
     type: tString(dmOperationTypes.CREATE_THREAD),
     threadID: t.String,
     creatorID: tUserID,
     time: t.Number,
     threadType: t.enums.of(values(nonSidebarThickThreadTypes)),
     memberIDs: t.list(tUserID),
     roleID: t.String,
     newMessageID: t.String,
   });
 
 export type DMCreateSidebarOperation = {
   +type: 'create_sidebar',
   +threadID: string,
   +creatorID: string,
   +time: number,
   +parentThreadID: string,
   +memberIDs: $ReadOnlyArray<string>,
   +sourceMessageID: string,
   +roleID: string,
   +newSidebarSourceMessageID: string,
   +newCreateSidebarMessageID: string,
 };
 export const dmCreateSidebarOperationValidator: TInterface<DMCreateSidebarOperation> =
   tShape<DMCreateSidebarOperation>({
     type: tString(dmOperationTypes.CREATE_SIDEBAR),
     threadID: t.String,
     creatorID: tUserID,
     time: t.Number,
     parentThreadID: t.String,
     memberIDs: t.list(tUserID),
     sourceMessageID: t.String,
     roleID: t.String,
     newSidebarSourceMessageID: t.String,
     newCreateSidebarMessageID: t.String,
   });
 
 export type DMSendTextMessageOperation = {
   +type: 'send_text_message',
   +threadID: string,
   +creatorID: string,
   +time: number,
   +messageID: string,
   +text: string,
 };
 export const dmSendTextMessageOperationValidator: TInterface<DMSendTextMessageOperation> =
   tShape<DMSendTextMessageOperation>({
     type: tString(dmOperationTypes.SEND_TEXT_MESSAGE),
     threadID: t.String,
     creatorID: tUserID,
     time: t.Number,
     messageID: t.String,
     text: t.String,
   });
 
 export type DMSendMultimediaMessageOperation = {
   +type: 'send_multimedia_message',
   +threadID: string,
   +creatorID: string,
   +time: number,
   +messageID: string,
   +media: $ReadOnlyArray<Media>,
 };
 export const dmSendMultimediaMessageOperationValidator: TInterface<DMSendMultimediaMessageOperation> =
   tShape<DMSendMultimediaMessageOperation>({
     type: tString(dmOperationTypes.SEND_MULTIMEDIA_MESSAGE),
     threadID: t.String,
     creatorID: tUserID,
     time: t.Number,
     messageID: t.String,
     media: t.list(mediaValidator),
   });
 
 export type DMSendReactionMessageOperation = {
   +type: 'send_reaction_message',
   +threadID: string,
   +creatorID: string,
   +time: number,
   +messageID: string,
   +targetMessageID: string,
   +reaction: string,
   +action: 'add_reaction' | 'remove_reaction',
 };
 export const dmSendReactionMessageOperationValidator: TInterface<DMSendReactionMessageOperation> =
   tShape<DMSendReactionMessageOperation>({
     type: tString(dmOperationTypes.SEND_REACTION_MESSAGE),
     threadID: t.String,
     creatorID: tUserID,
     time: t.Number,
     messageID: t.String,
     targetMessageID: t.String,
     reaction: t.String,
     action: t.enums.of(['add_reaction', 'remove_reaction']),
   });
 
 export type DMSendEditMessageOperation = {
   +type: 'send_edit_message',
   +threadID: string,
   +creatorID: string,
   +time: number,
   +messageID: string,
   +targetMessageID: string,
   +text: string,
 };
 export const dmSendEditMessageOperationValidator: TInterface<DMSendEditMessageOperation> =
   tShape<DMSendEditMessageOperation>({
     type: tString(dmOperationTypes.SEND_EDIT_MESSAGE),
     threadID: t.String,
     creatorID: tUserID,
     time: t.Number,
     messageID: t.String,
     targetMessageID: t.String,
     text: t.String,
   });
 
 type DMAddMembersBase = {
   +editorID: string,
   +time: number,
   +addedUserIDs: $ReadOnlyArray<string>,
 };
 const dmAddMembersBaseValidatorShape = {
   editorID: tUserID,
   time: t.Number,
   addedUserIDs: t.list(tUserID),
 };
 
 export type DMAddMembersOperation = $ReadOnly<{
   +type: 'add_members',
   +threadID: string,
   +messageID: string,
   ...DMAddMembersBase,
 }>;
 export const dmAddMembersOperationValidator: TInterface<DMAddMembersOperation> =
   tShape<DMAddMembersOperation>({
     type: tString(dmOperationTypes.ADD_MEMBERS),
     threadID: t.String,
     messageID: t.String,
     ...dmAddMembersBaseValidatorShape,
   });
 
 export type DMAddViewerToThreadMembersOperation = $ReadOnly<{
   +type: 'add_viewer_to_thread_members',
   +messageID: ?string,
   +existingThreadDetails: CreateThickRawThreadInfoInput,
   ...DMAddMembersBase,
 }>;
 export const dmAddViewerToThreadMembersValidator: TInterface<DMAddViewerToThreadMembersOperation> =
   tShape<DMAddViewerToThreadMembersOperation>({
     type: tString(dmOperationTypes.ADD_VIEWER_TO_THREAD_MEMBERS),
     messageID: t.maybe(t.String),
     existingThreadDetails: createThickRawThreadInfoInputValidator,
     ...dmAddMembersBaseValidatorShape,
   });
 
 export type DMJoinThreadOperation = {
   +type: 'join_thread',
   +joinerID: string,
   +time: number,
   +messageID: string,
   +existingThreadDetails: CreateThickRawThreadInfoInput,
 };
 export const dmJoinThreadOperationValidator: TInterface<DMJoinThreadOperation> =
   tShape<DMJoinThreadOperation>({
     type: tString(dmOperationTypes.JOIN_THREAD),
     joinerID: tUserID,
     time: t.Number,
     messageID: t.String,
     existingThreadDetails: createThickRawThreadInfoInputValidator,
   });
 
 export type DMLeaveThreadOperation = {
   +type: 'leave_thread',
   +editorID: string,
   +time: number,
   +messageID: string,
   +threadID: string,
 };
 export const dmLeaveThreadOperationValidator: TInterface<DMLeaveThreadOperation> =
   tShape<DMLeaveThreadOperation>({
     type: tString(dmOperationTypes.LEAVE_THREAD),
     editorID: tUserID,
     time: t.Number,
     messageID: t.String,
     threadID: t.String,
   });
 
 export type DMRemoveMembersOperation = {
   +type: 'remove_members',
   +editorID: string,
   +time: number,
   +messageID: string,
   +threadID: string,
   +removedUserIDs: $ReadOnlyArray<string>,
 };
 export const dmRemoveMembersOperationValidator: TInterface<DMRemoveMembersOperation> =
   tShape<DMRemoveMembersOperation>({
     type: tString(dmOperationTypes.REMOVE_MEMBERS),
     editorID: tUserID,
     time: t.Number,
     messageID: t.String,
     threadID: t.String,
     removedUserIDs: t.list(tUserID),
   });
 
 export type DMThreadSettingsChanges = {
   +name?: string,
   +description?: string,
   +color?: string,
   +avatar?: ClientAvatar | null,
 };
 
 export type DMChangeThreadSettingsOperation = $ReadOnly<{
   +type: 'change_thread_settings',
   +threadID: string,
   +editorID: string,
   +time: number,
   +changes: DMThreadSettingsChanges,
   +messageIDsPrefix: string,
 }>;
 export const dmChangeThreadSettingsOperationValidator: TInterface<DMChangeThreadSettingsOperation> =
   tShape<DMChangeThreadSettingsOperation>({
     type: tString(dmOperationTypes.CHANGE_THREAD_SETTINGS),
     threadID: t.String,
     editorID: tUserID,
     time: t.Number,
     changes: tShape({
       name: t.maybe(t.String),
       description: t.maybe(t.String),
       color: t.maybe(tColor),
       avatar: t.maybe(clientAvatarValidator),
     }),
     messageIDsPrefix: t.String,
   });
 
 export type DMChangeThreadSubscriptionOperation = {
   +type: 'change_thread_subscription',
   +time: number,
   +threadID: string,
   +creatorID: string,
   +subscription: ThreadSubscription,
 };
 export const dmChangeThreadSubscriptionOperationValidator: TInterface<DMChangeThreadSubscriptionOperation> =
   tShape<DMChangeThreadSubscriptionOperation>({
     type: tString(dmOperationTypes.CHANGE_THREAD_SUBSCRIPTION),
     time: t.Number,
     threadID: t.String,
     creatorID: tUserID,
     subscription: threadSubscriptionValidator,
   });
 
 export type DMChangeThreadReadStatusOperation = {
   +type: 'change_thread_read_status',
   +time: number,
   +threadID: string,
   +creatorID: string,
   +unread: boolean,
 };
 export const dmChangeThreadReadStatusOperationValidator: TInterface<DMChangeThreadReadStatusOperation> =
   tShape<DMChangeThreadReadStatusOperation>({
     type: tString(dmOperationTypes.CHANGE_THREAD_READ_STATUS),
     time: t.Number,
     threadID: t.String,
     creatorID: tUserID,
     unread: t.Boolean,
   });
 
 export type ComposableDMOperation =
   | DMSendTextMessageOperation
   | DMSendMultimediaMessageOperation;
 
 export type DMCreateEntryOperation = {
   +type: 'create_entry',
   +threadID: string,
   +creatorID: string,
   +time: number,
   +entryID: string,
   +entryDate: string,
   +text: string,
   +messageID: string,
 };
 export const dmCreateEntryOperationValidator: TInterface<DMCreateEntryOperation> =
   tShape<DMCreateEntryOperation>({
     type: tString(dmOperationTypes.CREATE_ENTRY),
     threadID: t.String,
     creatorID: t.String,
     time: t.Number,
     entryID: t.String,
     entryDate: t.String,
     text: t.String,
     messageID: t.String,
   });
 
 export type DMDeleteEntryOperation = {
   +type: 'delete_entry',
   +threadID: string,
   +creatorID: string,
   +time: number,
   +creationTime: number,
   +entryID: string,
   +entryDate: string,
   +prevText: string,
   +messageID: string,
 };
 export const dmDeleteEntryOperationValidator: TInterface<DMDeleteEntryOperation> =
   tShape<DMDeleteEntryOperation>({
     type: tString(dmOperationTypes.DELETE_ENTRY),
     threadID: t.String,
     creatorID: t.String,
     time: t.Number,
     creationTime: t.Number,
     entryID: t.String,
     entryDate: t.String,
     prevText: t.String,
     messageID: t.String,
   });
 
 export type DMEditEntryOperation = {
   +type: 'edit_entry',
   +threadID: string,
   +creatorID: string,
   +time: number,
   +creationTime: number,
   +entryID: string,
   +entryDate: string,
   +text: string,
   +messageID: string,
 };
 export const dmEditEntryOperationValidator: TInterface<DMEditEntryOperation> =
   tShape<DMEditEntryOperation>({
     type: tString(dmOperationTypes.EDIT_ENTRY),
     threadID: t.String,
     creatorID: t.String,
     creationTime: t.Number,
     time: t.Number,
     entryID: t.String,
     entryDate: t.String,
     text: t.String,
     messageID: t.String,
   });
 
 export type DMUpdateRelationshipOperation = {
   +type: 'update_relationship',
   +threadID: string,
   +creatorID: string,
   +time: number,
   +operation: RelationshipOperation,
+  +targetUserID: string,
   +messageID: string,
 };
 export const dmUpdateRelationshipOperationValidator: TInterface<DMUpdateRelationshipOperation> =
   tShape<DMUpdateRelationshipOperation>({
     type: tString(dmOperationTypes.UPDATE_RELATIONSHIP),
     threadID: t.String,
     creatorID: t.String,
     time: t.Number,
     operation: t.enums.of([
       'request_sent',
       'request_accepted',
       'farcaster_mutual',
     ]),
+    targetUserID: tUserID,
     messageID: t.String,
   });
 
 export type DMOperation =
   | DMCreateThreadOperation
   | DMCreateSidebarOperation
   | DMSendTextMessageOperation
   | DMSendMultimediaMessageOperation
   | DMSendReactionMessageOperation
   | DMSendEditMessageOperation
   | DMAddMembersOperation
   | DMAddViewerToThreadMembersOperation
   | DMJoinThreadOperation
   | DMLeaveThreadOperation
   | DMRemoveMembersOperation
   | DMChangeThreadSettingsOperation
   | DMChangeThreadSubscriptionOperation
   | DMChangeThreadReadStatusOperation
   | DMCreateEntryOperation
   | DMDeleteEntryOperation
   | DMEditEntryOperation
   | DMUpdateRelationshipOperation;
 export const dmOperationValidator: TUnion<DMOperation> = t.union([
   dmCreateThreadOperationValidator,
   dmCreateSidebarOperationValidator,
   dmSendTextMessageOperationValidator,
   dmSendMultimediaMessageOperationValidator,
   dmSendReactionMessageOperationValidator,
   dmSendEditMessageOperationValidator,
   dmAddMembersOperationValidator,
   dmAddViewerToThreadMembersValidator,
   dmJoinThreadOperationValidator,
   dmLeaveThreadOperationValidator,
   dmRemoveMembersOperationValidator,
   dmChangeThreadSettingsOperationValidator,
   dmChangeThreadSubscriptionOperationValidator,
   dmChangeThreadReadStatusOperationValidator,
   dmCreateEntryOperationValidator,
   dmDeleteEntryOperationValidator,
   dmEditEntryOperationValidator,
   dmUpdateRelationshipOperationValidator,
 ]);
 
 export type DMBlobOperation = $ReadOnly<{
   ...BlobOperation,
   +dmOpType: 'inbound_only' | 'outbound_only' | 'inbound_and_outbound',
 }>;
 
 export type DMOperationResult = {
   rawMessageInfos: Array<RawMessageInfo>,
   updateInfos: Array<ClientUpdateInfo>,
   blobOps: Array<DMBlobOperation>,
 };
 
 export const processDMOpsActionType = 'PROCESS_DM_OPS';
 
 export type ProcessDMOpsPayload = {
   +rawMessageInfos: $ReadOnlyArray<RawMessageInfo>,
   +updateInfos: $ReadOnlyArray<ClientUpdateInfo>,
   +outboundP2PMessages: ?$ReadOnlyArray<OutboundP2PMessage>,
   // For messages that could be retried from UI, we need to bind DM `messageID`
   // with `outboundP2PMessages` to keep track of whether all P2P messages
   // were queued on Tunnelbroker.
   +composableMessageID: ?string,
   +notificationsCreationData: ?NotificationsCreationData,
 };
 
 export const queueDMOpsActionType = 'QUEUE_DM_OPS';
 export type QueueDMOpsPayload = {
   +operation: DMOperation,
   +timestamp: number,
   +condition:
     | {
         +type: 'thread',
         +threadID: string,
       }
     | {
         +type: 'entry',
         +entryID: string,
       }
     | {
         +type: 'message',
         +messageID: string,
       }
     | {
         +type: 'membership',
         +threadID: string,
         +userID: string,
       },
 };
 
 export const pruneDMOpsQueueActionType = 'PRUNE_DM_OPS_QUEUE';
 export type PruneDMOpsQueuePayload = {
   +pruneMaxTimestamp: number,
 };
 
 export const clearQueuedThreadDMOpsActionType = 'CLEAR_QUEUED_THREAD_DM_OPS';
 export type ClearQueuedThreadDMOpsPayload = {
   +threadID: string,
 };
 
 export const clearQueuedMessageDMOpsActionType = 'CLEAR_QUEUED_MESSAGE_DM_OPS';
 export type ClearQueuedMessageDMOpsPayload = {
   +messageID: string,
 };
 
 export const clearQueuedEntryDMOpsActionType = 'CLEAR_QUEUED_ENTRY_DM_OPS';
 export type ClearQueuedEntryDMOpsPayload = {
   +entryID: string,
 };
 
 export const clearQueuedMembershipDMOpsActionType =
   'CLEAR_QUEUED_MEMBERSHIP_DM_OPS';
 export type ClearQueuedMembershipDMOpsPayload = {
   +threadID: string,
   +userID: string,
 };
 
 export type OperationsQueue = $ReadOnlyArray<{
   +operation: DMOperation,
   +timestamp: number,
 }>;
 
 export type QueuedDMOperations = {
   +threadQueue: {
     +[threadID: string]: OperationsQueue,
   },
   +messageQueue: {
     +[messageID: string]: OperationsQueue,
   },
   +entryQueue: {
     +[entryID: string]: OperationsQueue,
   },
   +membershipQueue: {
     +[threadID: string]: {
       +[memberID: string]: OperationsQueue,
     },
   },
 };