diff --git a/keyserver/src/updaters/entry-updaters.js b/keyserver/src/updaters/entry-updaters.js
--- a/keyserver/src/updaters/entry-updaters.js
+++ b/keyserver/src/updaters/entry-updaters.js
@@ -157,7 +157,7 @@
     `),
     );
   }
-  const updatedEntryInfo = {
+  const updatedEntryInfo: RawEntryInfo = {
     ...entryInfo,
     text: request.text,
   };
diff --git a/lib/types/entry-types.js b/lib/types/entry-types.js
--- a/lib/types/entry-types.js
+++ b/lib/types/entry-types.js
@@ -1,6 +1,6 @@
 // @flow
 
-import t, { type TInterface } from 'tcomb';
+import t, { type TInterface, type TUnion } from 'tcomb';
 
 import { type Platform, isWebPlatform } from './device-types.js';
 import {
@@ -21,34 +21,57 @@
 } from '../utils/date-utils.js';
 import { tUserID, tID, tShape } from '../utils/validation-utils.js';
 
-export type RawEntryInfo = {
-  id?: string, // null if local copy without ID yet
-  localID?: string, // for optimistic creations
-  threadID: string,
-  text: string,
-  year: number,
-  month: number, // 1-indexed
-  day: number, // 1-indexed
-  creationTime: number, // millisecond timestamp
-  creatorID: string,
-  deleted: boolean,
+export type RawEntryInfoBase = {
+  +id?: string, // null if local copy without ID yet
+  +localID?: string, // for optimistic creations
+  +threadID: string,
+  +text: string,
+  +year: number,
+  +month: number, // 1-indexed
+  +day: number, // 1-indexed
+  +creationTime: number, // millisecond timestamp
+  +creatorID: string,
+  +deleted: boolean,
+};
+const rawEntryInfoBaseValidatorShape = {
+  id: t.maybe(tID),
+  localID: t.maybe(t.String),
+  threadID: tID,
+  text: t.String,
+  year: t.Number,
+  month: t.Number,
+  day: t.Number,
+  creationTime: t.Number,
+  creatorID: tUserID,
+  deleted: t.Boolean,
 };
+
+export type ThinRawEntryInfo = RawEntryInfoBase;
+const thinRawEntryInfoValidator: TInterface<ThinRawEntryInfo> =
+  tShape<ThinRawEntryInfo>({
+    ...rawEntryInfoBaseValidatorShape,
+  });
+
+export type ThickRawEntryInfo = $ReadOnly<{
+  ...RawEntryInfoBase,
+  +thick: true,
+  +lastUpdatedTime: number,
+}>;
+const thickRawEntryInfoValidator: TInterface<ThickRawEntryInfo> =
+  tShape<ThickRawEntryInfo>({
+    ...rawEntryInfoBaseValidatorShape,
+    thick: t.Boolean,
+    lastUpdatedTime: t.Number,
+  });
+
+export type RawEntryInfo = ThinRawEntryInfo | ThickRawEntryInfo;
+export const rawEntryInfoValidator: TUnion<RawEntryInfo> = t.union([
+  thinRawEntryInfoValidator,
+  thickRawEntryInfoValidator,
+]);
 export type RawEntryInfos = {
   +[id: string]: RawEntryInfo,
 };
-export const rawEntryInfoValidator: TInterface<RawEntryInfo> =
-  tShape<RawEntryInfo>({
-    id: t.maybe(tID),
-    localID: t.maybe(t.String),
-    threadID: tID,
-    text: t.String,
-    year: t.Number,
-    month: t.Number,
-    day: t.Number,
-    creationTime: t.Number,
-    creatorID: tUserID,
-    deleted: t.Boolean,
-  });
 
 export type EntryInfo = {
   id?: string, // null if local copy without ID yet