diff --git a/core/storage-engine/src/storage-engine.ts b/core/storage-engine/src/storage-engine.ts
index e0fc26dbc..43a5de2be 100644
--- a/core/storage-engine/src/storage-engine.ts
+++ b/core/storage-engine/src/storage-engine.ts
@@ -1,15 +1,13 @@
 import {resolve} from 'node:path';
 
-import {createLogger, globalAlwatr} from '@alwatr/logger';
+import {createLogger, globalAlwatr, type AlwatrLogger} from '@alwatr/logger';
+import {type AlwatrDocumentStorage, type AlwatrDocumentObject} from '@alwatr/type';
 import exitHook from 'exit-hook';
 
+import {type AlwatrStorageEngineConfig} from './type.js';
 import {readJsonFile, writeJsonFile} from './util.js';
 
-import type {AlwatrStorageEngineConfig} from './type.js';
-import type {AlwatrLogger} from '@alwatr/logger';
-import type {AlwatrDocumentStorage, AlwatrDocumentObject} from '@alwatr/type';
-
-export type {AlwatrDocumentObject, AlwatrDocumentStorage};
+export {type AlwatrDocumentObject, type AlwatrDocumentStorage};
 
 globalAlwatr.registeredList.push({
   name: '@alwatr/storage-engine',
@@ -71,7 +69,7 @@ globalAlwatr.registeredList.push({
  * ```
  */
 export class AlwatrStorageEngine<DocumentType extends AlwatrDocumentObject = AlwatrDocumentObject> {
-  static readonly formatVersion = 4;
+  static readonly formatVersion = 5;
 
   /**
    * Storage name like database table name.
@@ -157,6 +155,10 @@ export class AlwatrStorageEngine<DocumentType extends AlwatrDocumentObject = Alw
 
     exitHook(this.forceSave);
     this._storage = this.load();
+
+    if (this._storage.meta?.formatVersion !== AlwatrStorageEngine.formatVersion) {
+      this._migrateStorage();
+    }
   }
 
   /**
@@ -179,12 +181,31 @@ export class AlwatrStorageEngine<DocumentType extends AlwatrDocumentObject = Alw
       throw new Error('invalid_storage_data');
     }
 
-    if (storage.meta?.formatVersion !== AlwatrStorageEngine.formatVersion) {
-      this._logger.error('load', 'storage_version_incompatible', {storageMeta: storage.meta});
+    return storage;
+  }
+
+  protected _migrateStorage(): void {
+    if (this._storage.meta == null) {
+      this._storage.meta = {
+        id: this.name,
+        formatVersion: 5,
+        reversion: 0,
+        lastUpdated: Date.now(),
+        lastAutoId: -1,
+      };
+    }
+
+    if (this._storage.meta.formatVersion === 4) {
+      this._storage.meta.id = this.name;
+      this._storage.meta.formatVersion = 5;
+    }
+
+    if (this._storage.meta.formatVersion !== AlwatrStorageEngine.formatVersion) {
+      this._logger.error('load', 'storage_version_incompatible', {storageMeta: this._storage.meta});
       throw new Error('storage_version_incompatible');
     }
 
-    return storage;
+    this.save();
   }
 
   /**