fix(server): wrap updates applying in a transaction (#4922)

packages/backend/server/src/modules/doc/manager.ts

@@ -8,7 +8,13 @@ import {
 import { Snapshot, Update } from '@prisma/client';
 import { chunk } from 'lodash-es';
 import { defer, retry } from 'rxjs';
-import { applyUpdate, Doc, encodeStateAsUpdate, encodeStateVector } from 'yjs';
+import {
+  applyUpdate,
+  Doc,
+  encodeStateAsUpdate,
+  encodeStateVector,
+  transact,
+} from 'yjs';
 
 import { Config } from '../../config';
 import { Metrics } from '../../metrics/metrics';
@@ -84,6 +90,7 @@ export class DocManager implements OnModuleInit, OnModuleDestroy {
       const next = () => {
         const updates = chunks.shift();
         if (updates?.length) {
+          transact(doc, () => {
             updates.forEach(u => {
               try {
                 applyUpdate(doc, u);
@@ -95,6 +102,7 @@ export class DocManager implements OnModuleInit, OnModuleDestroy {
                 );
               }
             });
+          });
 
           // avoid applying too many updates in single round which will take the whole cpu time like dead lock
           setImmediate(() => {