diff --git a/lib/reducers/calendar-filters-reducer.js b/lib/reducers/calendar-filters-reducer.js
--- a/lib/reducers/calendar-filters-reducer.js
+++ b/lib/reducers/calendar-filters-reducer.js
@@ -41,7 +41,10 @@
   fullStateSyncActionType,
   incrementalStateSyncActionType,
 } from '../types/socket-types.js';
-import type { RawThreadInfos, ThreadStore } from '../types/thread-types.js';
+import type {
+  MinimallyEncodedRawThreadInfos,
+  ThreadStore,
+} from '../types/thread-types.js';
 import {
   type ClientUpdateInfo,
   processUpdatesActionType,
@@ -184,7 +187,7 @@
 
 function removeDeletedThreadIDsFromFilterList(
   state: $ReadOnlyArray<CalendarFilter>,
-  threadInfos: RawThreadInfos,
+  threadInfos: MinimallyEncodedRawThreadInfos,
 ): $ReadOnlyArray<CalendarFilter> {
   const filterCondition = (threadID: string) =>
     threadInFilterList(threadInfos[threadID]);
diff --git a/lib/reducers/entry-reducer.js b/lib/reducers/entry-reducer.js
--- a/lib/reducers/entry-reducer.js
+++ b/lib/reducers/entry-reducer.js
@@ -56,7 +56,7 @@
   fullStateSyncActionType,
   incrementalStateSyncActionType,
 } from '../types/socket-types.js';
-import { type RawThreadInfos } from '../types/thread-types.js';
+import type { MinimallyEncodedRawThreadInfos } from '../types/thread-types.js';
 import {
   type ClientUpdateInfo,
   processUpdatesActionType,
@@ -91,7 +91,7 @@
   currentEntryInfos: { +[id: string]: RawEntryInfo },
   currentDaysToEntries: ?{ +[day: string]: string[] },
   newEntryInfos: $ReadOnlyArray<RawEntryInfo>,
-  threadInfos: RawThreadInfos,
+  threadInfos: MinimallyEncodedRawThreadInfos,
 ) {
   const mergedEntryInfos: { [string]: RawEntryInfo } = {};
   let someEntryUpdated = false;
@@ -164,7 +164,7 @@
 function reduceEntryInfos(
   entryStore: EntryStore,
   action: BaseAction,
-  newThreadInfos: RawThreadInfos,
+  newThreadInfos: MinimallyEncodedRawThreadInfos,
 ): [EntryStore, $ReadOnlyArray<ClientEntryInconsistencyReportCreationRequest>] {
   const { entryInfos, daysToEntries, lastUserInteractionCalendar } = entryStore;
   if (
diff --git a/lib/reducers/message-reducer.js b/lib/reducers/message-reducer.js
--- a/lib/reducers/message-reducer.js
+++ b/lib/reducers/message-reducer.js
@@ -98,6 +98,7 @@
 import { threadPermissions } from '../types/thread-permission-types.js';
 import type {
   LegacyRawThreadInfo,
+  MinimallyEncodedRawThreadInfos,
   RawThreadInfos,
 } from '../types/thread-types.js';
 import {
@@ -216,7 +217,7 @@
 
 function reassignMessagesToRealizedThreads(
   messageStore: MessageStore,
-  threadInfos: RawThreadInfos,
+  threadInfos: MinimallyEncodedRawThreadInfos,
 ): ReassignmentResult {
   const pendingToRealizedThreadIDs =
     pendingToRealizedThreadIDsSelector(threadInfos);
@@ -309,7 +310,7 @@
   oldMessageStore: MessageStore,
   newMessageInfos: $ReadOnlyArray<RawMessageInfo>,
   truncationStatus: { +[threadID: string]: MessageTruncationStatus },
-  threadInfos: RawThreadInfos,
+  threadInfos: MinimallyEncodedRawThreadInfos,
 ): MergeNewMessagesResult {
   const {
     messageStoreOperations: updateWithLatestThreadInfosOps,
@@ -633,7 +634,7 @@
 };
 function updateMessageStoreWithLatestThreadInfos(
   messageStore: MessageStore,
-  threadInfos: RawThreadInfos,
+  threadInfos: MinimallyEncodedRawThreadInfos,
 ): UpdateMessageStoreWithLatestThreadInfosResult {
   const messageStoreOperations: MessageStoreOperation[] = [];
   const {
@@ -701,7 +702,7 @@
 
 function ensureRealizedThreadIDIsUsedWhenPossible<T: RawMessageInfo>(
   payload: T,
-  threadInfos: RawThreadInfos,
+  threadInfos: MinimallyEncodedRawThreadInfos,
 ): T {
   const pendingToRealizedThreadIDs =
     pendingToRealizedThreadIDsSelector(threadInfos);
@@ -721,7 +722,7 @@
 function reduceMessageStore(
   messageStore: MessageStore,
   action: BaseAction,
-  newThreadInfos: RawThreadInfos,
+  newThreadInfos: MinimallyEncodedRawThreadInfos,
 ): ReduceMessageStoreResult {
   if (
     action.type === logInActionTypes.success ||
diff --git a/lib/selectors/thread-selectors.js b/lib/selectors/thread-selectors.js
--- a/lib/selectors/thread-selectors.js
+++ b/lib/selectors/thread-selectors.js
@@ -420,7 +420,7 @@
   (state: BaseAppState<>) => state.threadStore.threadInfos,
   threadInfoSelector,
   (
-    rawThreadInfos: RawThreadInfos,
+    rawThreadInfos: MinimallyEncodedRawThreadInfos,
     threadInfos: { +[id: string]: ThreadInfo },
   ) => {
     const pendingToRealizedThreadIDs =
@@ -436,10 +436,10 @@
   },
 );
 const pendingToRealizedThreadIDsSelector: (
-  rawThreadInfos: RawThreadInfos,
+  rawThreadInfos: MinimallyEncodedRawThreadInfos,
 ) => $ReadOnlyMap<string, string> = createSelector(
-  (rawThreadInfos: RawThreadInfos) => rawThreadInfos,
-  (rawThreadInfos: RawThreadInfos) => {
+  (rawThreadInfos: MinimallyEncodedRawThreadInfos) => rawThreadInfos,
+  (rawThreadInfos: MinimallyEncodedRawThreadInfos) => {
     const result = new Map<string, string>();
     for (const threadID in rawThreadInfos) {
       const rawThreadInfo = rawThreadInfos[threadID];
diff --git a/lib/selectors/user-selectors.js b/lib/selectors/user-selectors.js
--- a/lib/selectors/user-selectors.js
+++ b/lib/selectors/user-selectors.js
@@ -16,7 +16,7 @@
 import type {
   LegacyRawThreadInfo,
   RelativeMemberInfo,
-  RawThreadInfos,
+  MinimallyEncodedRawThreadInfos,
 } from '../types/thread-types.js';
 import type {
   UserInfos,
@@ -173,7 +173,7 @@
 ) => $ReadOnlySet<string> = createSelector(
   (state: BaseAppState<>) => state.currentUserInfo && state.currentUserInfo.id,
   (state: BaseAppState<>) => state.threadStore.threadInfos,
-  (viewerID: ?string, threadInfos: RawThreadInfos) => {
+  (viewerID: ?string, threadInfos: MinimallyEncodedRawThreadInfos) => {
     const personalThreadMembers = new Set<string>();
 
     for (const threadID in threadInfos) {
diff --git a/native/selectors/message-selectors.js b/native/selectors/message-selectors.js
--- a/native/selectors/message-selectors.js
+++ b/native/selectors/message-selectors.js
@@ -6,7 +6,7 @@
 import type { ThreadMessageInfo } from 'lib/types/message-types.js';
 import { defaultNumberPerThread } from 'lib/types/message-types.js';
 import type { ThreadActivityStore } from 'lib/types/thread-activity-types.js';
-import type { RawThreadInfos } from 'lib/types/thread-types.js';
+import type { MinimallyEncodedRawThreadInfos } from 'lib/types/thread-types.js';
 
 import { activeThreadSelector } from '../navigation/nav-selectors.js';
 import type { AppState } from '../redux/state-types.js';
@@ -19,7 +19,7 @@
     (state: AppState) => state.threadStore.threadInfos,
     (state: AppState) => state.threadActivityStore,
     (
-      threadInfos: RawThreadInfos,
+      threadInfos: MinimallyEncodedRawThreadInfos,
       threadActivityStore: ThreadActivityStore,
     ): ?number => {
       let nextTime;
diff --git a/web/redux/nav-reducer.js b/web/redux/nav-reducer.js
--- a/web/redux/nav-reducer.js
+++ b/web/redux/nav-reducer.js
@@ -2,7 +2,7 @@
 
 import { pendingToRealizedThreadIDsSelector } from 'lib/selectors/thread-selectors.js';
 import { threadIsPending } from 'lib/shared/thread-utils.js';
-import type { RawThreadInfos } from 'lib/types/thread-types.js';
+import type { MinimallyEncodedRawThreadInfos } from 'lib/types/thread-types.js';
 
 import { updateNavInfoActionType } from '../redux/action-types.js';
 import type { Action } from '../redux/redux-setup.js';
@@ -11,7 +11,7 @@
 export default function reduceNavInfo(
   oldState: NavInfo,
   action: Action,
-  newThreadInfos: RawThreadInfos,
+  newThreadInfos: MinimallyEncodedRawThreadInfos,
 ): NavInfo {
   let state = oldState;
   if (action.type === updateNavInfoActionType) {