diff --git a/keyserver/src/endpoints.js b/keyserver/src/endpoints.js
index 619d16ef2..fdbb55c55 100644
--- a/keyserver/src/endpoints.js
+++ b/keyserver/src/endpoints.js
@@ -1,101 +1,103 @@
 // @flow
 
 import type { Endpoint } from 'lib/types/endpoints';
 
 import {
   updateActivityResponder,
   threadSetUnreadStatusResponder,
 } from './responders/activity-responders';
 import { deviceTokenUpdateResponder } from './responders/device-responders';
 import {
   entryFetchResponder,
   entryRevisionFetchResponder,
   entryCreationResponder,
   entryUpdateResponder,
   entryDeletionResponder,
   entryRestorationResponder,
   calendarQueryUpdateResponder,
 } from './responders/entry-responders';
 import type { JSONResponder } from './responders/handlers';
 import { getSessionPublicKeysResponder } from './responders/keys-responders';
 import { messageReportCreationResponder } from './responders/message-report-responder';
 import {
   textMessageCreationResponder,
   messageFetchResponder,
   multimediaMessageCreationResponder,
 } from './responders/message-responders';
 import { updateRelationshipsResponder } from './responders/relationship-responders';
 import {
   reportCreationResponder,
   reportMultiCreationResponder,
   errorReportFetchInfosResponder,
 } from './responders/report-responders';
 import { userSearchResponder } from './responders/search-responders';
 import {
   threadDeletionResponder,
   roleUpdateResponder,
   memberRemovalResponder,
   threadLeaveResponder,
   threadUpdateResponder,
   threadCreationResponder,
   threadJoinResponder,
 } from './responders/thread-responders';
 import {
   userSubscriptionUpdateResponder,
   passwordUpdateResponder,
   sendVerificationEmailResponder,
   sendPasswordResetEmailResponder,
   logOutResponder,
   accountDeletionResponder,
   accountCreationResponder,
   logInResponder,
   oldPasswordUpdateResponder,
   updateUserSettingsResponder,
+  policyAcknowledgmentResponder,
 } from './responders/user-responders';
 import { codeVerificationResponder } from './responders/verification-responders';
 import { uploadDeletionResponder } from './uploads/uploads';
 
 const jsonEndpoints: { [id: Endpoint]: JSONResponder } = {
   create_account: accountCreationResponder,
   create_entry: entryCreationResponder,
   create_error_report: reportCreationResponder,
   create_message_report: messageReportCreationResponder,
   create_multimedia_message: multimediaMessageCreationResponder,
   create_report: reportCreationResponder,
   create_reports: reportMultiCreationResponder,
   create_text_message: textMessageCreationResponder,
   create_thread: threadCreationResponder,
   delete_account: accountDeletionResponder,
   delete_entry: entryDeletionResponder,
   delete_thread: threadDeletionResponder,
   delete_upload: uploadDeletionResponder,
   fetch_entries: entryFetchResponder,
   fetch_entry_revisions: entryRevisionFetchResponder,
   fetch_error_report_infos: errorReportFetchInfosResponder,
   fetch_messages: messageFetchResponder,
   get_session_public_keys: getSessionPublicKeysResponder,
   join_thread: threadJoinResponder,
   leave_thread: threadLeaveResponder,
   log_in: logInResponder,
   log_out: logOutResponder,
+  policy_acknowledgment: policyAcknowledgmentResponder,
   remove_members: memberRemovalResponder,
   restore_entry: entryRestorationResponder,
   search_users: userSearchResponder,
   send_password_reset_email: sendPasswordResetEmailResponder,
   send_verification_email: sendVerificationEmailResponder,
   set_thread_unread_status: threadSetUnreadStatusResponder,
   update_account: passwordUpdateResponder,
   update_activity: updateActivityResponder,
   update_calendar_query: calendarQueryUpdateResponder,
   update_user_settings: updateUserSettingsResponder,
   update_device_token: deviceTokenUpdateResponder,
   update_entry: entryUpdateResponder,
   update_password: oldPasswordUpdateResponder,
   update_relationships: updateRelationshipsResponder,
   update_role: roleUpdateResponder,
   update_thread: threadUpdateResponder,
   update_user_subscription: userSubscriptionUpdateResponder,
   verify_code: codeVerificationResponder,
 };
 
 export { jsonEndpoints };
diff --git a/keyserver/src/responders/user-responders.js b/keyserver/src/responders/user-responders.js
index 0e1f10d2f..4674f5127 100644
--- a/keyserver/src/responders/user-responders.js
+++ b/keyserver/src/responders/user-responders.js
@@ -1,342 +1,363 @@
 // @flow
 
 import invariant from 'invariant';
 import t from 'tcomb';
 import bcrypt from 'twin-bcrypt';
 
+import { policies } from 'lib/facts/policies.js';
 import { hasMinCodeVersion } from 'lib/shared/version-utils';
 import type {
   ResetPasswordRequest,
   LogOutResponse,
   DeleteAccountRequest,
   RegisterResponse,
   RegisterRequest,
   LogInResponse,
   LogInRequest,
   UpdatePasswordRequest,
   UpdateUserSettingsRequest,
+  PolicyAcknowledgmentRequest,
 } from 'lib/types/account-types';
 import {
   userSettingsTypes,
   notificationTypeValues,
   logInActionSources,
 } from 'lib/types/account-types';
 import { defaultNumberPerThread } from 'lib/types/message-types';
 import type {
   SubscriptionUpdateRequest,
   SubscriptionUpdateResponse,
 } from 'lib/types/subscription-types';
 import type { PasswordUpdate } from 'lib/types/user-types';
 import { ServerError } from 'lib/utils/errors';
 import { values } from 'lib/utils/objects';
 import { promiseAll } from 'lib/utils/promises';
 import {
   tShape,
   tPlatformDetails,
   tPassword,
   tEmail,
   tOldValidUsername,
 } from 'lib/utils/validation-utils';
 
 import createAccount from '../creators/account-creator';
 import { dbQuery, SQL } from '../database/database';
 import { deleteAccount } from '../deleters/account-deleters';
 import { deleteCookie } from '../deleters/cookie-deleters';
 import { fetchEntryInfos } from '../fetchers/entry-fetchers';
 import { fetchMessageInfos } from '../fetchers/message-fetchers';
 import { fetchThreadInfos } from '../fetchers/thread-fetchers';
 import {
   fetchKnownUserInfos,
   fetchLoggedInUserInfo,
 } from '../fetchers/user-fetchers';
 import {
   createNewAnonymousCookie,
   createNewUserCookie,
   setNewSession,
 } from '../session/cookies';
 import type { Viewer } from '../session/viewer';
 import {
   accountUpdater,
   checkAndSendVerificationEmail,
   checkAndSendPasswordResetEmail,
   updatePassword,
   updateUserSettings,
 } from '../updaters/account-updaters';
 import { userSubscriptionUpdater } from '../updaters/user-subscription-updaters';
+import { viewerAcknowledgmentUpdater } from '../updaters/viewer-acknowledgment-updater.js';
 import { validateInput } from '../utils/validation-utils';
 import {
   entryQueryInputValidator,
   newEntryQueryInputValidator,
   normalizeCalendarQuery,
   verifyCalendarQueryThreadIDs,
 } from './entry-responders';
 
 const subscriptionUpdateRequestInputValidator = tShape({
   threadID: t.String,
   updatedFields: tShape({
     pushNotifs: t.maybe(t.Boolean),
     home: t.maybe(t.Boolean),
   }),
 });
 
 async function userSubscriptionUpdateResponder(
   viewer: Viewer,
   input: any,
 ): Promise<SubscriptionUpdateResponse> {
   const request: SubscriptionUpdateRequest = input;
   await validateInput(viewer, subscriptionUpdateRequestInputValidator, request);
   const threadSubscription = await userSubscriptionUpdater(viewer, request);
   return { threadSubscription };
 }
 
 const accountUpdateInputValidator = tShape({
   updatedFields: tShape({
     email: t.maybe(tEmail),
     password: t.maybe(tPassword),
   }),
   currentPassword: tPassword,
 });
 
 async function passwordUpdateResponder(
   viewer: Viewer,
   input: any,
 ): Promise<void> {
   const request: PasswordUpdate = input;
   await validateInput(viewer, accountUpdateInputValidator, request);
   await accountUpdater(viewer, request);
 }
 
 async function sendVerificationEmailResponder(viewer: Viewer): Promise<void> {
   await validateInput(viewer, null, null);
   await checkAndSendVerificationEmail(viewer);
 }
 
 const resetPasswordRequestInputValidator = tShape({
   usernameOrEmail: t.union([tEmail, tOldValidUsername]),
 });
 
 async function sendPasswordResetEmailResponder(
   viewer: Viewer,
   input: any,
 ): Promise<void> {
   const request: ResetPasswordRequest = input;
   await validateInput(viewer, resetPasswordRequestInputValidator, request);
   await checkAndSendPasswordResetEmail(request);
 }
 
 async function logOutResponder(viewer: Viewer): Promise<LogOutResponse> {
   await validateInput(viewer, null, null);
   if (viewer.loggedIn) {
     const [anonymousViewerData] = await Promise.all([
       createNewAnonymousCookie({
         platformDetails: viewer.platformDetails,
         deviceToken: viewer.deviceToken,
       }),
       deleteCookie(viewer.cookieID),
     ]);
     viewer.setNewCookie(anonymousViewerData);
   }
   return {
     currentUserInfo: {
       id: viewer.id,
       anonymous: true,
     },
   };
 }
 
 const deleteAccountRequestInputValidator = tShape({
   password: tPassword,
 });
 
 async function accountDeletionResponder(
   viewer: Viewer,
   input: any,
 ): Promise<LogOutResponse> {
   const request: DeleteAccountRequest = input;
   await validateInput(viewer, deleteAccountRequestInputValidator, request);
   const result = await deleteAccount(viewer, request);
   invariant(result, 'deleteAccount should return result if handed request');
   return result;
 }
 
 const deviceTokenUpdateRequestInputValidator = tShape({
   deviceType: t.maybe(t.enums.of(['ios', 'android'])),
   deviceToken: t.String,
 });
 
 const registerRequestInputValidator = tShape({
   username: t.String,
   email: t.maybe(tEmail),
   password: tPassword,
   calendarQuery: t.maybe(newEntryQueryInputValidator),
   deviceTokenUpdateRequest: t.maybe(deviceTokenUpdateRequestInputValidator),
   platformDetails: tPlatformDetails,
 });
 
 async function accountCreationResponder(
   viewer: Viewer,
   input: any,
 ): Promise<RegisterResponse> {
   const request: RegisterRequest = input;
   await validateInput(viewer, registerRequestInputValidator, request);
   return await createAccount(viewer, request);
 }
 
 const logInRequestInputValidator = tShape({
   username: t.maybe(t.String),
   usernameOrEmail: t.maybe(t.union([tEmail, tOldValidUsername])),
   password: tPassword,
   watchedIDs: t.list(t.String),
   calendarQuery: t.maybe(entryQueryInputValidator),
   deviceTokenUpdateRequest: t.maybe(deviceTokenUpdateRequestInputValidator),
   platformDetails: tPlatformDetails,
   source: t.maybe(t.enums.of(values(logInActionSources))),
 });
 
 async function logInResponder(
   viewer: Viewer,
   input: any,
 ): Promise<LogInResponse> {
   await validateInput(viewer, logInRequestInputValidator, input);
   const request: LogInRequest = input;
 
   const calendarQuery = request.calendarQuery
     ? normalizeCalendarQuery(request.calendarQuery)
     : null;
   const promises = {};
   if (calendarQuery) {
     promises.verifyCalendarQueryThreadIDs = verifyCalendarQueryThreadIDs(
       calendarQuery,
     );
   }
   const username = request.username ?? request.usernameOrEmail;
   if (!username) {
     throw new ServerError('invalid_parameters');
   }
   const userQuery = SQL`
     SELECT id, hash, username
     FROM users
     WHERE LCASE(username) = LCASE(${username})
   `;
   promises.userQuery = dbQuery(userQuery);
   const {
     userQuery: [userResult],
   } = await promiseAll(promises);
 
   if (userResult.length === 0) {
     throw new ServerError('invalid_parameters');
   }
   const userRow = userResult[0];
   if (!userRow.hash || !bcrypt.compareSync(request.password, userRow.hash)) {
     if (hasMinCodeVersion(viewer.platformDetails, 99999)) {
       throw new ServerError('invalid_parameters');
     } else {
       throw new ServerError('invalid_credentials');
     }
   }
   const id = userRow.id.toString();
 
   const newServerTime = Date.now();
   const deviceToken = request.deviceTokenUpdateRequest
     ? request.deviceTokenUpdateRequest.deviceToken
     : viewer.deviceToken;
   const [userViewerData] = await Promise.all([
     createNewUserCookie(id, {
       platformDetails: request.platformDetails,
       deviceToken,
     }),
     deleteCookie(viewer.cookieID),
   ]);
   viewer.setNewCookie(userViewerData);
   if (calendarQuery) {
     await setNewSession(viewer, calendarQuery, newServerTime);
   }
 
   const threadCursors = {};
   for (const watchedThreadID of request.watchedIDs) {
     threadCursors[watchedThreadID] = null;
   }
   const messageSelectionCriteria = { threadCursors, joinedThreads: true };
 
   const [
     threadsResult,
     messagesResult,
     entriesResult,
     userInfos,
     currentUserInfo,
   ] = await Promise.all([
     fetchThreadInfos(viewer),
     fetchMessageInfos(viewer, messageSelectionCriteria, defaultNumberPerThread),
     calendarQuery ? fetchEntryInfos(viewer, [calendarQuery]) : undefined,
     fetchKnownUserInfos(viewer),
     fetchLoggedInUserInfo(viewer),
   ]);
 
   const rawEntryInfos = entriesResult ? entriesResult.rawEntryInfos : null;
   const response: LogInResponse = {
     currentUserInfo,
     rawMessageInfos: messagesResult.rawMessageInfos,
     truncationStatuses: messagesResult.truncationStatuses,
     serverTime: newServerTime,
     userInfos: values(userInfos),
     cookieChange: {
       threadInfos: threadsResult.threadInfos,
       userInfos: [],
     },
   };
   if (rawEntryInfos) {
     response.rawEntryInfos = rawEntryInfos;
   }
   return response;
 }
 
 const updatePasswordRequestInputValidator = tShape({
   code: t.String,
   password: tPassword,
   watchedIDs: t.list(t.String),
   calendarQuery: t.maybe(entryQueryInputValidator),
   deviceTokenUpdateRequest: t.maybe(deviceTokenUpdateRequestInputValidator),
   platformDetails: tPlatformDetails,
 });
 
 async function oldPasswordUpdateResponder(
   viewer: Viewer,
   input: any,
 ): Promise<LogInResponse> {
   await validateInput(viewer, updatePasswordRequestInputValidator, input);
   const request: UpdatePasswordRequest = input;
   if (request.calendarQuery) {
     request.calendarQuery = normalizeCalendarQuery(request.calendarQuery);
   }
   return await updatePassword(viewer, request);
 }
 
 const updateUserSettingsInputValidator = tShape({
   name: t.irreducible(
     userSettingsTypes.DEFAULT_NOTIFICATIONS,
     x => x === userSettingsTypes.DEFAULT_NOTIFICATIONS,
   ),
   data: t.enums.of(notificationTypeValues),
 });
 
 async function updateUserSettingsResponder(
   viewer: Viewer,
   input: any,
 ): Promise<void> {
   const request: UpdateUserSettingsRequest = input;
   await validateInput(viewer, updateUserSettingsInputValidator, request);
   return await updateUserSettings(viewer, request);
 }
 
+const policyAcknowledgmentRequestInputValidator = tShape({
+  policy: t.maybe(t.enums.of(policies)),
+});
+
+async function policyAcknowledgmentResponder(
+  viewer: Viewer,
+  input: any,
+): Promise<void> {
+  const request: PolicyAcknowledgmentRequest = input;
+  await validateInput(
+    viewer,
+    policyAcknowledgmentRequestInputValidator,
+    request,
+  );
+  await viewerAcknowledgmentUpdater(viewer, request.policy);
+}
+
 export {
   userSubscriptionUpdateResponder,
   passwordUpdateResponder,
   sendVerificationEmailResponder,
   sendPasswordResetEmailResponder,
   logOutResponder,
   accountDeletionResponder,
   accountCreationResponder,
   logInResponder,
   oldPasswordUpdateResponder,
   updateUserSettingsResponder,
+  policyAcknowledgmentResponder,
 };
diff --git a/lib/types/account-types.js b/lib/types/account-types.js
index 4ed2bd220..c9eafcaf5 100644
--- a/lib/types/account-types.js
+++ b/lib/types/account-types.js
@@ -1,178 +1,183 @@
 // @flow
 
+import type { PolicyType } from '../facts/policies.js';
 import { values } from '../utils/objects';
 import type { PlatformDetails } from './device-types';
 import type {
   CalendarQuery,
   CalendarResult,
   RawEntryInfo,
 } from './entry-types';
 import type {
   RawMessageInfo,
   MessageTruncationStatuses,
   GenericMessagesResult,
 } from './message-types';
 import type { PreRequestUserState } from './session-types';
 import type { RawThreadInfo } from './thread-types';
 import type {
   UserInfo,
   LoggedOutUserInfo,
   LoggedInUserInfo,
   OldLoggedInUserInfo,
 } from './user-types';
 
 export type ResetPasswordRequest = {
   +usernameOrEmail: string,
 };
 
 export type LogOutResult = {
   +currentUserInfo: ?LoggedOutUserInfo,
   +preRequestUserState: PreRequestUserState,
 };
 
 export type LogOutResponse = {
   +currentUserInfo: LoggedOutUserInfo,
 };
 
 export type RegisterInfo = {
   ...LogInExtraInfo,
   +username: string,
   +password: string,
 };
 
 type DeviceTokenUpdateRequest = {
   +deviceToken: string,
 };
 
 export type RegisterRequest = {
   +username: string,
   +password: string,
   +calendarQuery?: ?CalendarQuery,
   +deviceTokenUpdateRequest?: ?DeviceTokenUpdateRequest,
   +platformDetails: PlatformDetails,
 };
 
 export type RegisterResponse = {
   id: string,
   rawMessageInfos: $ReadOnlyArray<RawMessageInfo>,
   currentUserInfo: OldLoggedInUserInfo | LoggedInUserInfo,
   cookieChange: {
     threadInfos: { +[id: string]: RawThreadInfo },
     userInfos: $ReadOnlyArray<UserInfo>,
   },
 };
 
 export type RegisterResult = {
   +currentUserInfo: LoggedInUserInfo,
   +rawMessageInfos: $ReadOnlyArray<RawMessageInfo>,
   +threadInfos: { +[id: string]: RawThreadInfo },
   +userInfos: $ReadOnlyArray<UserInfo>,
   +calendarQuery: CalendarQuery,
 };
 
 export type DeleteAccountRequest = {
   +password: string,
 };
 
 export const logInActionSources = Object.freeze({
   cookieInvalidationResolutionAttempt: 'COOKIE_INVALIDATION_RESOLUTION_ATTEMPT',
   appStartCookieLoggedInButInvalidRedux:
     'APP_START_COOKIE_LOGGED_IN_BUT_INVALID_REDUX',
   appStartReduxLoggedInButInvalidCookie:
     'APP_START_REDUX_LOGGED_IN_BUT_INVALID_COOKIE',
   socketAuthErrorResolutionAttempt: 'SOCKET_AUTH_ERROR_RESOLUTION_ATTEMPT',
   sqliteOpFailure: 'SQLITE_OP_FAILURE',
   sqliteLoadFailure: 'SQLITE_LOAD_FAILURE',
   logInFromWebForm: 'LOG_IN_FROM_WEB_FORM',
   logInFromNativeForm: 'LOG_IN_FROM_NATIVE_FORM',
 });
 
 export type LogInActionSource = $Values<typeof logInActionSources>;
 
 export type LogInStartingPayload = {
   +calendarQuery: CalendarQuery,
   +logInActionSource?: LogInActionSource,
 };
 
 export type LogInExtraInfo = {
   +calendarQuery: CalendarQuery,
   +deviceTokenUpdateRequest?: ?DeviceTokenUpdateRequest,
 };
 
 export type LogInInfo = {
   ...LogInExtraInfo,
   +username: string,
   +password: string,
   +logInActionSource: LogInActionSource,
 };
 
 export type LogInRequest = {
   +usernameOrEmail?: ?string,
   +username?: ?string,
   +password: string,
   +calendarQuery?: ?CalendarQuery,
   +deviceTokenUpdateRequest?: ?DeviceTokenUpdateRequest,
   +platformDetails: PlatformDetails,
   +watchedIDs: $ReadOnlyArray<string>,
   +source?: LogInActionSource,
 };
 
 export type LogInResponse = {
   currentUserInfo: LoggedInUserInfo | OldLoggedInUserInfo,
   rawMessageInfos: $ReadOnlyArray<RawMessageInfo>,
   truncationStatuses: MessageTruncationStatuses,
   userInfos: $ReadOnlyArray<UserInfo>,
   rawEntryInfos?: ?$ReadOnlyArray<RawEntryInfo>,
   serverTime: number,
   cookieChange: {
     threadInfos: { +[id: string]: RawThreadInfo },
     userInfos: $ReadOnlyArray<UserInfo>,
   },
 };
 
 export type LogInResult = {
   +threadInfos: { +[id: string]: RawThreadInfo },
   +currentUserInfo: LoggedInUserInfo,
   +messagesResult: GenericMessagesResult,
   +userInfos: $ReadOnlyArray<UserInfo>,
   +calendarResult: CalendarResult,
   +updatesCurrentAsOf: number,
   +logInActionSource: LogInActionSource,
 };
 
 export type UpdatePasswordRequest = {
   code: string,
   password: string,
   calendarQuery?: ?CalendarQuery,
   deviceTokenUpdateRequest?: ?DeviceTokenUpdateRequest,
   platformDetails: PlatformDetails,
   watchedIDs: $ReadOnlyArray<string>,
 };
 
+export type PolicyAcknowledgmentRequest = {
+  +policy: PolicyType,
+};
+
 export type EmailSubscriptionRequest = {
   +email: string,
 };
 export type UpdateUserSettingsRequest = {
   +name: 'default_user_notifications',
   +data: NotificationTypes,
 };
 
 export const userSettingsTypes = Object.freeze({
   DEFAULT_NOTIFICATIONS: 'default_user_notifications',
 });
 
 export type DefaultNotificationPayload = {
   +default_user_notifications: ?NotificationTypes,
 };
 
 export const notificationTypes = Object.freeze({
   FOCUSED: 'focused',
   BADGE_ONLY: 'badge_only',
   BACKGROUND: 'background',
 });
 
 export type NotificationTypes = $Values<typeof notificationTypes>;
 
 export const notificationTypeValues: $ReadOnlyArray<NotificationTypes> = values(
   notificationTypes,
 );
diff --git a/lib/types/endpoints.js b/lib/types/endpoints.js
index af59b61e0..cd4630e21 100644
--- a/lib/types/endpoints.js
+++ b/lib/types/endpoints.js
@@ -1,110 +1,111 @@
 // @flow
 
 export type APIRequest = {
   endpoint: Endpoint,
   input: Object,
 };
 export type SocketAPIHandler = (request: APIRequest) => Promise<Object>;
 
 export type Endpoint =
   | HTTPOnlyEndpoint
   | SocketOnlyEndpoint
   | HTTPPreferredEndpoint
   | SocketPreferredEndpoint;
 
 // Endpoints that can cause session changes should occur over HTTP, since the
 // socket code does not currently support changing sessions. In the future they
 // could be made to work for native, but cookie changes on web require HTTP
 // since websockets aren't able to Set-Cookie. Note that technically any
 // endpoint can cause a sessionChange, and in that case the server will close
 // the socket with a specific error code, and the client will proceed via HTTP.
 const sessionChangingEndpoints = Object.freeze({
   LOG_OUT: 'log_out',
   DELETE_ACCOUNT: 'delete_account',
   CREATE_ACCOUNT: 'create_account',
   LOG_IN: 'log_in',
   UPDATE_PASSWORD: 'update_password',
+  POLICY_ACKNOWLEDGMENT: 'policy_acknowledgment',
 });
 type SessionChangingEndpoint = $Values<typeof sessionChangingEndpoints>;
 
 // We do uploads over HTTP as well. This is because Websockets use TCP, which
 // guarantees ordering. That means that if we start an upload, any messages we
 // try to send the server after the upload starts will have to wait until the
 // upload ends. To avoid blocking other messages we upload using HTTP
 // multipart/form-data.
 const uploadEndpoints = Object.freeze({
   UPLOAD_MULTIMEDIA: 'upload_multimedia',
 });
 type UploadEndpoint = $Values<typeof uploadEndpoints>;
 
 type HTTPOnlyEndpoint = SessionChangingEndpoint | UploadEndpoint;
 
 const socketOnlyEndpoints = Object.freeze({
   UPDATE_ACTIVITY: 'update_activity',
   UPDATE_CALENDAR_QUERY: 'update_calendar_query',
 });
 type SocketOnlyEndpoint = $Values<typeof socketOnlyEndpoints>;
 
 const socketPreferredEndpoints = Object.freeze({
   CREATE_ENTRY: 'create_entry',
   CREATE_ERROR_REPORT: 'create_error_report',
   CREATE_MESSAGE_REPORT: 'create_message_report',
   CREATE_MULTIMEDIA_MESSAGE: 'create_multimedia_message',
   CREATE_TEXT_MESSAGE: 'create_text_message',
   CREATE_THREAD: 'create_thread',
   DELETE_ENTRY: 'delete_entry',
   DELETE_THREAD: 'delete_thread',
   DELETE_UPLOAD: 'delete_upload',
   FETCH_ENTRIES: 'fetch_entries',
   FETCH_ENTRY_REVISIONS: 'fetch_entry_revisions',
   FETCH_ERROR_REPORT_INFOS: 'fetch_error_report_infos',
   FETCH_MESSAGES: 'fetch_messages',
   GET_SESSION_PUBLIC_KEYS: 'get_session_public_keys',
   JOIN_THREAD: 'join_thread',
   LEAVE_THREAD: 'leave_thread',
   REMOVE_MEMBERS: 'remove_members',
   REQUEST_ACCESS: 'request_access',
   RESTORE_ENTRY: 'restore_entry',
   SEARCH_USERS: 'search_users',
   SEND_PASSWORD_RESET_EMAIL: 'send_password_reset_email',
   SEND_VERIFICATION_EMAIL: 'send_verification_email',
   SET_THREAD_UNREAD_STATUS: 'set_thread_unread_status',
   UPDATE_ACCOUNT: 'update_account',
   UPDATE_USER_SETTINGS: 'update_user_settings',
   UPDATE_DEVICE_TOKEN: 'update_device_token',
   UPDATE_ENTRY: 'update_entry',
   UPDATE_RELATIONSHIPS: 'update_relationships',
   UPDATE_ROLE: 'update_role',
   UPDATE_THREAD: 'update_thread',
   UPDATE_USER_SUBSCRIPTION: 'update_user_subscription',
   VERIFY_CODE: 'verify_code',
 });
 type SocketPreferredEndpoint = $Values<typeof socketPreferredEndpoints>;
 
 const httpPreferredEndpoints = Object.freeze({
   CREATE_REPORT: 'create_report',
   CREATE_REPORTS: 'create_reports',
 });
 type HTTPPreferredEndpoint = $Values<typeof httpPreferredEndpoints>;
 
 const socketPreferredEndpointSet = new Set([
   ...Object.values(socketOnlyEndpoints),
   ...Object.values(socketPreferredEndpoints),
 ]);
 export function endpointIsSocketPreferred(endpoint: Endpoint): boolean {
   return socketPreferredEndpointSet.has(endpoint);
 }
 
 const socketSafeEndpointSet = new Set([
   ...Object.values(socketOnlyEndpoints),
   ...Object.values(socketPreferredEndpoints),
   ...Object.values(httpPreferredEndpoints),
 ]);
 export function endpointIsSocketSafe(endpoint: Endpoint): boolean {
   return socketSafeEndpointSet.has(endpoint);
 }
 
 const socketOnlyEndpointSet = new Set(Object.values(socketOnlyEndpoints));
 export function endpointIsSocketOnly(endpoint: Endpoint): boolean {
   return socketOnlyEndpointSet.has(endpoint);
 }