diff --git a/keyserver/src/shared/state-sync/entries-state-sync-spec.js b/keyserver/src/shared/state-sync/entries-state-sync-spec.js
index 8de8ffcc3..47f4e1b41 100644
--- a/keyserver/src/shared/state-sync/entries-state-sync-spec.js
+++ b/keyserver/src/shared/state-sync/entries-state-sync-spec.js
@@ -1,29 +1,33 @@
 // @flow
 
 import { serverEntryInfosObject } from 'lib/shared/entry-utils.js';
 import type { CalendarQuery, RawEntryInfos } from 'lib/types/entry-types.js';
 
 import type { StateSyncSpec } from './state-sync-spec.js';
 import {
   fetchEntryInfos,
   fetchEntryInfosByID,
 } from '../../fetchers/entry-fetchers.js';
 import type { Viewer } from '../../session/viewer.js';
 
 export const entriesStateSyncSpec: StateSyncSpec<RawEntryInfos> = Object.freeze(
   {
     async fetch(
       viewer: Viewer,
       query: $ReadOnlyArray<CalendarQuery>,
       ids?: $ReadOnlySet<string>,
     ) {
       if (ids) {
         return fetchEntryInfosByID(viewer, ids);
       }
       const entriesResult = await fetchEntryInfos(viewer, query);
       return serverEntryInfosObject(entriesResult.rawEntryInfos);
     },
     hashKey: 'entryInfos',
-    innerHashKey: 'entryInfo',
+    innerHashSpec: {
+      hashKey: 'entryInfo',
+      deleteKey: 'deleteEntryIDs',
+      rawInfosKey: 'rawEntryInfos',
+    },
   },
 );
diff --git a/keyserver/src/shared/state-sync/state-sync-spec.js b/keyserver/src/shared/state-sync/state-sync-spec.js
index 1289b117b..8879bf861 100644
--- a/keyserver/src/shared/state-sync/state-sync-spec.js
+++ b/keyserver/src/shared/state-sync/state-sync-spec.js
@@ -1,15 +1,20 @@
 // @flow
 
 import type { CalendarQuery } from 'lib/types/entry-types.js';
 
 import type { Viewer } from '../../session/viewer.js';
 
-export type StateSyncSpec<Infos> = {
+export type StateSyncSpec<Infos, Info = empty> = {
   +fetch: (
     viewer: Viewer,
     calendarQuery: $ReadOnlyArray<CalendarQuery>,
     ids?: $ReadOnlySet<string>,
   ) => Promise<Infos>,
   +hashKey: string,
-  +innerHashKey?: string,
+  +innerHashSpec?: {
+    +hashKey: string,
+    +deleteKey: string,
+    +rawInfosKey: string,
+    +additionalDeleteCondition?: Info => boolean,
+  },
 };
diff --git a/keyserver/src/shared/state-sync/threads-state-sync-spec.js b/keyserver/src/shared/state-sync/threads-state-sync-spec.js
index af3441155..87fcf06fa 100644
--- a/keyserver/src/shared/state-sync/threads-state-sync-spec.js
+++ b/keyserver/src/shared/state-sync/threads-state-sync-spec.js
@@ -1,25 +1,29 @@
 // @flow
 
 import type { CalendarQuery } from 'lib/types/entry-types.js';
 
 import type { StateSyncSpec } from './state-sync-spec.js';
 import {
   fetchThreadInfos,
   type RawThreadInfos,
 } from '../../fetchers/thread-fetchers.js';
 import type { Viewer } from '../../session/viewer.js';
 
 export const threadsStateSyncSpec: StateSyncSpec<RawThreadInfos> =
   Object.freeze({
     async fetch(
       viewer: Viewer,
       query: $ReadOnlyArray<CalendarQuery>,
       ids?: $ReadOnlySet<string>,
     ) {
       const filter = ids ? { threadIDs: ids } : undefined;
       const result = await fetchThreadInfos(viewer, filter);
       return result.threadInfos;
     },
     hashKey: 'threadInfos',
-    innerHashKey: 'threadInfo',
+    innerHashSpec: {
+      hashKey: 'threadInfo',
+      deleteKey: 'deleteThreadIDs',
+      rawInfosKey: 'rawThreadInfos',
+    },
   });
diff --git a/keyserver/src/shared/state-sync/users-state-sync-spec.js b/keyserver/src/shared/state-sync/users-state-sync-spec.js
index b9b2c1557..b64975532 100644
--- a/keyserver/src/shared/state-sync/users-state-sync-spec.js
+++ b/keyserver/src/shared/state-sync/users-state-sync-spec.js
@@ -1,24 +1,32 @@
 // @flow
 
 import type { CalendarQuery } from 'lib/types/entry-types.js';
-import type { UserInfos } from 'lib/types/user-types.js';
+import type { UserInfos, UserInfo } from 'lib/types/user-types.js';
 
 import type { StateSyncSpec } from './state-sync-spec.js';
 import { fetchKnownUserInfos } from '../../fetchers/user-fetchers.js';
 import type { Viewer } from '../../session/viewer.js';
 
-export const usersStateSyncSpec: StateSyncSpec<UserInfos> = Object.freeze({
-  fetch(
-    viewer: Viewer,
-    query: $ReadOnlyArray<CalendarQuery>,
-    ids?: $ReadOnlySet<string>,
-  ) {
-    if (ids) {
-      return fetchKnownUserInfos(viewer, [...ids]);
-    }
+export const usersStateSyncSpec: StateSyncSpec<UserInfos, UserInfo> =
+  Object.freeze({
+    fetch(
+      viewer: Viewer,
+      query: $ReadOnlyArray<CalendarQuery>,
+      ids?: $ReadOnlySet<string>,
+    ) {
+      if (ids) {
+        return fetchKnownUserInfos(viewer, [...ids]);
+      }
 
-    return fetchKnownUserInfos(viewer);
-  },
-  hashKey: 'userInfos',
-  innerHashKey: 'userInfo',
-});
+      return fetchKnownUserInfos(viewer);
+    },
+    hashKey: 'userInfos',
+    innerHashSpec: {
+      hashKey: 'userInfo',
+      deleteKey: 'deleteUserInfoIDs',
+      rawInfosKey: 'userInfos',
+      additionalDeleteCondition(user: UserInfo) {
+        return !user.username;
+      },
+    },
+  });
diff --git a/keyserver/src/socket/session-utils.js b/keyserver/src/socket/session-utils.js
index 0d7fba378..120c29b35 100644
--- a/keyserver/src/socket/session-utils.js
+++ b/keyserver/src/socket/session-utils.js
@@ -1,528 +1,504 @@
 // @flow
 
 import invariant from 'invariant';
 import t from 'tcomb';
 import type { TUnion } from 'tcomb';
 
 import type { UpdateActivityResult } from 'lib/types/activity-types.js';
 import type { IdentityKeysBlob } from 'lib/types/crypto-types.js';
 import { isDeviceType } from 'lib/types/device-types.js';
 import type {
   CalendarQuery,
   DeltaEntryInfosResponse,
 } from 'lib/types/entry-types.js';
 import {
   reportTypes,
   type ThreadInconsistencyReportCreationRequest,
   type EntryInconsistencyReportCreationRequest,
 } from 'lib/types/report-types.js';
 import {
   serverRequestTypes,
   type ThreadInconsistencyClientResponse,
   type EntryInconsistencyClientResponse,
   type ClientResponse,
   type ServerServerRequest,
   type ServerCheckStateServerRequest,
 } from 'lib/types/request-types.js';
 import { sessionCheckFrequency } from 'lib/types/session-types.js';
 import { signedIdentityKeysBlobValidator } from 'lib/utils/crypto-utils.js';
 import { hash, values } from 'lib/utils/objects.js';
 import { promiseAll } from 'lib/utils/promises.js';
 import {
   tShape,
   tPlatform,
   tPlatformDetails,
 } from 'lib/utils/validation-utils.js';
 
 import { createOlmSession } from '../creators/olm-session-creator.js';
 import { saveOneTimeKeys } from '../creators/one-time-keys-creator.js';
 import createReport from '../creators/report-creator.js';
 import { fetchEntriesForSession } from '../fetchers/entry-fetchers.js';
 import { checkIfSessionHasEnoughOneTimeKeys } from '../fetchers/key-fetchers.js';
 import { activityUpdatesInputValidator } from '../responders/activity-responders.js';
 import { handleAsyncPromise } from '../responders/handlers.js';
 import {
   threadInconsistencyReportValidatorShape,
   entryInconsistencyReportValidatorShape,
 } from '../responders/report-responders.js';
 import {
   setNewSession,
   setCookiePlatform,
   setCookiePlatformDetails,
   setCookieSignedIdentityKeysBlob,
 } from '../session/cookies.js';
 import type { Viewer } from '../session/viewer.js';
 import { serverStateSyncSpecs } from '../shared/state-sync/state-sync-specs.js';
 import { activityUpdater } from '../updaters/activity-updaters.js';
 import { compareNewCalendarQuery } from '../updaters/entry-updaters.js';
 import type { SessionUpdate } from '../updaters/session-updaters.js';
 import { getOlmUtility } from '../utils/olm-utils.js';
 
 const clientResponseInputValidator: TUnion<ClientResponse> = t.union([
   tShape({
     type: t.irreducible(
       'serverRequestTypes.PLATFORM',
       x => x === serverRequestTypes.PLATFORM,
     ),
     platform: tPlatform,
   }),
   tShape({
     ...threadInconsistencyReportValidatorShape,
     type: t.irreducible(
       'serverRequestTypes.THREAD_INCONSISTENCY',
       x => x === serverRequestTypes.THREAD_INCONSISTENCY,
     ),
   }),
   tShape({
     ...entryInconsistencyReportValidatorShape,
     type: t.irreducible(
       'serverRequestTypes.ENTRY_INCONSISTENCY',
       x => x === serverRequestTypes.ENTRY_INCONSISTENCY,
     ),
   }),
   tShape({
     type: t.irreducible(
       'serverRequestTypes.PLATFORM_DETAILS',
       x => x === serverRequestTypes.PLATFORM_DETAILS,
     ),
     platformDetails: tPlatformDetails,
   }),
   tShape({
     type: t.irreducible(
       'serverRequestTypes.CHECK_STATE',
       x => x === serverRequestTypes.CHECK_STATE,
     ),
     hashResults: t.dict(t.String, t.Boolean),
   }),
   tShape({
     type: t.irreducible(
       'serverRequestTypes.INITIAL_ACTIVITY_UPDATES',
       x => x === serverRequestTypes.INITIAL_ACTIVITY_UPDATES,
     ),
     activityUpdates: activityUpdatesInputValidator,
   }),
   tShape({
     type: t.irreducible(
       'serverRequestTypes.MORE_ONE_TIME_KEYS',
       x => x === serverRequestTypes.MORE_ONE_TIME_KEYS,
     ),
     keys: t.list(t.String),
   }),
   tShape({
     type: t.irreducible(
       'serverRequestTypes.SIGNED_IDENTITY_KEYS_BLOB',
       x => x === serverRequestTypes.SIGNED_IDENTITY_KEYS_BLOB,
     ),
     signedIdentityKeysBlob: signedIdentityKeysBlobValidator,
   }),
   tShape({
     type: t.irreducible(
       'serverRequestTypes.INITIAL_NOTIFICATIONS_ENCRYPTED_MESSAGE',
       x => x === serverRequestTypes.INITIAL_NOTIFICATIONS_ENCRYPTED_MESSAGE,
     ),
     initialNotificationsEncryptedMessage: t.String,
   }),
 ]);
 
 type StateCheckStatus =
   | { status: 'state_validated' }
   | { status: 'state_invalid', invalidKeys: $ReadOnlyArray<string> }
   | { status: 'state_check' };
 type ProcessClientResponsesResult = {
   serverRequests: ServerServerRequest[],
   stateCheckStatus: ?StateCheckStatus,
   activityUpdateResult: ?UpdateActivityResult,
 };
 async function processClientResponses(
   viewer: Viewer,
   clientResponses: $ReadOnlyArray<ClientResponse>,
 ): Promise<ProcessClientResponsesResult> {
   let viewerMissingPlatform = !viewer.platform;
   const { platformDetails } = viewer;
   let viewerMissingPlatformDetails =
     !platformDetails ||
     (isDeviceType(viewer.platform) &&
       (platformDetails.codeVersion === null ||
         platformDetails.codeVersion === undefined ||
         platformDetails.stateVersion === null ||
         platformDetails.stateVersion === undefined));
 
   const promises = [];
   let activityUpdates = [];
   let stateCheckStatus = null;
   const clientSentPlatformDetails = clientResponses.some(
     response => response.type === serverRequestTypes.PLATFORM_DETAILS,
   );
   for (const clientResponse of clientResponses) {
     if (
       clientResponse.type === serverRequestTypes.PLATFORM &&
       !clientSentPlatformDetails
     ) {
       promises.push(setCookiePlatform(viewer, clientResponse.platform));
       viewerMissingPlatform = false;
       if (!isDeviceType(clientResponse.platform)) {
         viewerMissingPlatformDetails = false;
       }
     } else if (
       clientResponse.type === serverRequestTypes.THREAD_INCONSISTENCY
     ) {
       promises.push(recordThreadInconsistency(viewer, clientResponse));
     } else if (clientResponse.type === serverRequestTypes.ENTRY_INCONSISTENCY) {
       promises.push(recordEntryInconsistency(viewer, clientResponse));
     } else if (clientResponse.type === serverRequestTypes.PLATFORM_DETAILS) {
       promises.push(
         setCookiePlatformDetails(viewer, clientResponse.platformDetails),
       );
       viewerMissingPlatform = false;
       viewerMissingPlatformDetails = false;
     } else if (
       clientResponse.type === serverRequestTypes.INITIAL_ACTIVITY_UPDATES
     ) {
       activityUpdates = [...activityUpdates, ...clientResponse.activityUpdates];
     } else if (clientResponse.type === serverRequestTypes.CHECK_STATE) {
       const invalidKeys = [];
       for (const key in clientResponse.hashResults) {
         const result = clientResponse.hashResults[key];
         if (!result) {
           invalidKeys.push(key);
         }
       }
       stateCheckStatus =
         invalidKeys.length > 0
           ? { status: 'state_invalid', invalidKeys }
           : { status: 'state_validated' };
     } else if (clientResponse.type === serverRequestTypes.MORE_ONE_TIME_KEYS) {
       invariant(clientResponse.keys, 'keys expected in client response');
       handleAsyncPromise(saveOneTimeKeys(viewer, clientResponse.keys));
     } else if (
       clientResponse.type === serverRequestTypes.SIGNED_IDENTITY_KEYS_BLOB
     ) {
       invariant(
         clientResponse.signedIdentityKeysBlob,
         'signedIdentityKeysBlob expected in client response',
       );
       const { signedIdentityKeysBlob } = clientResponse;
       const identityKeys: IdentityKeysBlob = JSON.parse(
         signedIdentityKeysBlob.payload,
       );
       const olmUtil = getOlmUtility();
       try {
         olmUtil.ed25519_verify(
           identityKeys.primaryIdentityPublicKeys.ed25519,
           signedIdentityKeysBlob.payload,
           signedIdentityKeysBlob.signature,
         );
         handleAsyncPromise(
           setCookieSignedIdentityKeysBlob(
             viewer.cookieID,
             signedIdentityKeysBlob,
           ),
         );
       } catch (e) {
         continue;
       }
     } else if (
       clientResponse.type ===
       serverRequestTypes.INITIAL_NOTIFICATIONS_ENCRYPTED_MESSAGE
     ) {
       invariant(
         t.String.is(clientResponse.initialNotificationsEncryptedMessage),
         'initialNotificationsEncryptedMessage expected in client response',
       );
       const { initialNotificationsEncryptedMessage } = clientResponse;
       try {
         await createOlmSession(
           initialNotificationsEncryptedMessage,
           'notifications',
           viewer.cookieID,
         );
       } catch (e) {
         continue;
       }
     }
   }
 
   const activityUpdatePromise = (async () => {
     if (activityUpdates.length === 0) {
       return undefined;
     }
     return await activityUpdater(viewer, { updates: activityUpdates });
   })();
 
   const serverRequests = [];
 
   const checkOneTimeKeysPromise = (async () => {
     if (!viewer.loggedIn) {
       return;
     }
     const enoughOneTimeKeys = await checkIfSessionHasEnoughOneTimeKeys(
       viewer.session,
     );
     if (!enoughOneTimeKeys) {
       serverRequests.push({ type: serverRequestTypes.MORE_ONE_TIME_KEYS });
     }
   })();
 
   const { activityUpdateResult } = await promiseAll({
     all: Promise.all(promises),
     activityUpdateResult: activityUpdatePromise,
     checkOneTimeKeysPromise,
   });
 
   if (
     !stateCheckStatus &&
     viewer.loggedIn &&
     viewer.sessionLastValidated + sessionCheckFrequency < Date.now()
   ) {
     stateCheckStatus = { status: 'state_check' };
   }
 
   if (viewerMissingPlatform) {
     serverRequests.push({ type: serverRequestTypes.PLATFORM });
   }
   if (viewerMissingPlatformDetails) {
     serverRequests.push({ type: serverRequestTypes.PLATFORM_DETAILS });
   }
   return { serverRequests, stateCheckStatus, activityUpdateResult };
 }
 
 async function recordThreadInconsistency(
   viewer: Viewer,
   response: ThreadInconsistencyClientResponse,
 ): Promise<void> {
   const { type, ...rest } = response;
   const reportCreationRequest = ({
     ...rest,
     type: reportTypes.THREAD_INCONSISTENCY,
   }: ThreadInconsistencyReportCreationRequest);
   await createReport(viewer, reportCreationRequest);
 }
 
 async function recordEntryInconsistency(
   viewer: Viewer,
   response: EntryInconsistencyClientResponse,
 ): Promise<void> {
   const { type, ...rest } = response;
   const reportCreationRequest = ({
     ...rest,
     type: reportTypes.ENTRY_INCONSISTENCY,
   }: EntryInconsistencyReportCreationRequest);
   await createReport(viewer, reportCreationRequest);
 }
 
 type SessionInitializationResult =
   | { sessionContinued: false }
   | {
       sessionContinued: true,
       deltaEntryInfoResult: DeltaEntryInfosResponse,
       sessionUpdate: SessionUpdate,
     };
 async function initializeSession(
   viewer: Viewer,
   calendarQuery: CalendarQuery,
   oldLastUpdate: number,
 ): Promise<SessionInitializationResult> {
   if (!viewer.loggedIn) {
     return { sessionContinued: false };
   }
 
   if (!viewer.hasSessionInfo) {
     // If the viewer has no session info but is logged in, that is indicative
     // of an expired / invalidated session and we should generate a new one
     await setNewSession(viewer, calendarQuery, oldLastUpdate);
     return { sessionContinued: false };
   }
 
   if (oldLastUpdate < viewer.sessionLastUpdated) {
     // If the client has an older last_update than the server is tracking for
     // that client, then the client either had some issue persisting its store,
     // or the user restored the client app from a backup. Either way, we should
     // invalidate the existing session, since the server has assumed that the
     // checkpoint is further along than it is on the client, and might not still
     // have all of the updates necessary to do an incremental update
     await setNewSession(viewer, calendarQuery, oldLastUpdate);
     return { sessionContinued: false };
   }
 
   let comparisonResult = null;
   try {
     comparisonResult = compareNewCalendarQuery(viewer, calendarQuery);
   } catch (e) {
     if (e.message !== 'unknown_error') {
       throw e;
     }
   }
 
   if (comparisonResult) {
     const { difference, oldCalendarQuery } = comparisonResult;
     const sessionUpdate = {
       ...comparisonResult.sessionUpdate,
       lastUpdate: oldLastUpdate,
     };
     const deltaEntryInfoResult = await fetchEntriesForSession(
       viewer,
       difference,
       oldCalendarQuery,
     );
     return { sessionContinued: true, deltaEntryInfoResult, sessionUpdate };
   } else {
     await setNewSession(viewer, calendarQuery, oldLastUpdate);
     return { sessionContinued: false };
   }
 }
 
 type StateCheckResult = {
   sessionUpdate?: SessionUpdate,
   checkStateRequest?: ServerCheckStateServerRequest,
 };
 async function checkState(
   viewer: Viewer,
   status: StateCheckStatus,
   calendarQuery: CalendarQuery,
 ): Promise<StateCheckResult> {
   const query = [calendarQuery];
   if (status.status === 'state_validated') {
     return { sessionUpdate: { lastValidated: Date.now() } };
   } else if (status.status === 'state_check') {
     const promises = Object.fromEntries(
       values(serverStateSyncSpecs).map(spec => [
         spec.hashKey,
         (async () => {
           const data = await spec.fetch(viewer, query);
           return hash(data);
         })(),
       ]),
     );
     const hashesToCheck = await promiseAll(promises);
     const checkStateRequest = {
       type: serverRequestTypes.CHECK_STATE,
       hashesToCheck,
     };
     return { checkStateRequest };
   }
 
   const invalidKeys = new Set(status.invalidKeys);
 
   const shouldFetchAll = Object.fromEntries(
     values(serverStateSyncSpecs).map(spec => [
       spec.hashKey,
       invalidKeys.has(spec.hashKey),
     ]),
   );
   const idsToFetch = Object.fromEntries(
     values(serverStateSyncSpecs)
-      .filter(spec => spec.innerHashKey)
-      .map(spec => [spec.innerHashKey, new Set()]),
+      .filter(spec => spec.innerHashSpec?.hashKey)
+      .map(spec => [spec.innerHashSpec?.hashKey, new Set()]),
   );
   for (const key of invalidKeys) {
     const [innerHashKey, id] = key.split('|');
     if (innerHashKey && id) {
       idsToFetch[innerHashKey]?.add(id);
     }
   }
 
   const fetchPromises = {};
   for (const spec of values(serverStateSyncSpecs)) {
     if (shouldFetchAll[spec.hashKey]) {
       fetchPromises[spec.hashKey] = spec.fetch(viewer, query);
-    } else if (idsToFetch[spec.innerHashKey]?.size > 0) {
+    } else if (idsToFetch[spec.innerHashSpec?.hashKey]?.size > 0) {
       fetchPromises[spec.hashKey] = spec.fetch(
         viewer,
         query,
-        idsToFetch[spec.innerHashKey],
+        idsToFetch[spec.innerHashSpec?.hashKey],
       );
     }
   }
   const fetchedData = await promiseAll(fetchPromises);
 
   const specPerHashKey = Object.fromEntries(
     values(serverStateSyncSpecs).map(spec => [spec.hashKey, spec]),
   );
+  const specPerInnerHashKey = Object.fromEntries(
+    values(serverStateSyncSpecs)
+      .filter(spec => spec.innerHashSpec?.hashKey)
+      .map(spec => [spec.innerHashSpec?.hashKey, spec]),
+  );
   const hashesToCheck = {},
     failUnmentioned = {},
     stateChanges = {};
   for (const key of invalidKeys) {
     const spec = specPerHashKey[key];
-    const innerHashKey = spec?.innerHashKey;
+    const innerHashKey = spec?.innerHashSpec?.hashKey;
     const isTopLevelKey = !!spec;
     if (isTopLevelKey && innerHashKey) {
       // Instead of returning all the infos, we want to narrow down and figure
       // out which infos don't match first
       const infos = fetchedData[key];
       for (const infoID in infos) {
         hashesToCheck[`${innerHashKey}|${infoID}`] = hash(infos[infoID]);
       }
       failUnmentioned[key] = true;
     } else if (isTopLevelKey) {
       stateChanges[key] = fetchedData[key];
-    } else if (key.startsWith('threadInfo|')) {
-      const [, threadID] = key.split('|');
-      const threadInfos = fetchedData[serverStateSyncSpecs.threads.hashKey];
-      const threadInfo = threadInfos[threadID];
-      if (!threadInfo) {
-        if (!stateChanges.deleteThreadIDs) {
-          stateChanges.deleteThreadIDs = [];
-        }
-        stateChanges.deleteThreadIDs.push(threadID);
+    } else {
+      const [keyPrefix, id] = key.split('|');
+      const innerSpec = specPerInnerHashKey[keyPrefix];
+      const innerHashSpec = innerSpec?.innerHashSpec;
+      if (!innerHashSpec || !id) {
         continue;
       }
-      if (!stateChanges.rawThreadInfos) {
-        stateChanges.rawThreadInfos = [];
-      }
-      stateChanges.rawThreadInfos.push(threadInfo);
-    } else if (key.startsWith('entryInfo|')) {
-      const [, entryID] = key.split('|');
-      const entryInfos = fetchedData[serverStateSyncSpecs.entries.hashKey];
-      const entryInfo = entryInfos[entryID];
-      if (!entryInfo) {
-        if (!stateChanges.deleteEntryIDs) {
-          stateChanges.deleteEntryIDs = [];
+      const infos = fetchedData[innerSpec.hashKey];
+      const info = infos[id];
+      if (!info || innerHashSpec.additionalDeleteCondition?.(info)) {
+        if (!stateChanges[innerHashSpec.deleteKey]) {
+          stateChanges[innerHashSpec.deleteKey] = [];
         }
-        stateChanges.deleteEntryIDs.push(entryID);
+        stateChanges[innerHashSpec.deleteKey].push(id);
         continue;
       }
-      if (!stateChanges.rawEntryInfos) {
-        stateChanges.rawEntryInfos = [];
-      }
-      stateChanges.rawEntryInfos.push(entryInfo);
-    } else if (key.startsWith('userInfo|')) {
-      const [, userID] = key.split('|');
-      const userInfos = fetchedData[serverStateSyncSpecs.users.hashKey];
-      const userInfo = userInfos[userID];
-      if (!userInfo || !userInfo.username) {
-        if (!stateChanges.deleteUserInfoIDs) {
-          stateChanges.deleteUserInfoIDs = [];
-        }
-        stateChanges.deleteUserInfoIDs.push(userID);
-      } else {
-        if (!stateChanges.userInfos) {
-          stateChanges.userInfos = [];
-        }
-        stateChanges.userInfos.push({
-          ...userInfo,
-          // Flow gets confused if we don't do this
-          username: userInfo.username,
-        });
+      if (!stateChanges[innerHashSpec.rawInfosKey]) {
+        stateChanges[innerHashSpec.rawInfosKey] = [];
       }
+      stateChanges[innerHashSpec.rawInfosKey].push(info);
     }
   }
 
   const checkStateRequest = {
     type: serverRequestTypes.CHECK_STATE,
     hashesToCheck,
     failUnmentioned,
     stateChanges,
   };
   if (Object.keys(hashesToCheck).length === 0) {
     return { checkStateRequest, sessionUpdate: { lastValidated: Date.now() } };
   } else {
     return { checkStateRequest };
   }
 }
 
 export {
   clientResponseInputValidator,
   processClientResponses,
   initializeSession,
   checkState,
 };