diff --git a/packages/backend/server/src/core/doc/job.ts b/packages/backend/server/src/core/doc/job.ts
index f9e384369..10f0f52bd 100644
--- a/packages/backend/server/src/core/doc/job.ts
+++ b/packages/backend/server/src/core/doc/job.ts
@@ -1,33 +1,27 @@
 import { Injectable } from '@nestjs/common';
 import { Cron, CronExpression } from '@nestjs/schedule';
-import { PrismaClient } from '@prisma/client';
 
 import { metrics, OnEvent } from '../../base';
+import { Models } from '../../models';
 import { PgWorkspaceDocStorageAdapter } from './adapters/workspace';
 
 @Injectable()
 export class DocStorageCronJob {
   constructor(
-    private readonly db: PrismaClient,
+    private readonly models: Models,
     private readonly workspace: PgWorkspaceDocStorageAdapter
   ) {}
 
   @Cron(CronExpression.EVERY_DAY_AT_MIDNIGHT /* everyday at 12am */)
   async cleanupExpiredHistory() {
-    await this.db.snapshotHistory.deleteMany({
-      where: {
-        expiredAt: {
-          lte: new Date(),
-        },
-      },
-    });
+    await this.models.doc.deleteExpiredHistories();
   }
 
   @Cron(CronExpression.EVERY_MINUTE)
   async reportUpdatesQueueCount() {
     metrics.doc
       .gauge('updates_queue_count')
-      .record(await this.db.update.count());
+      .record(await this.models.doc.getGlobalUpdateCount());
   }
 
   @OnEvent('user.deleted')
diff --git a/packages/backend/server/src/models/doc.ts b/packages/backend/server/src/models/doc.ts
index d91edc928..b631f04c5 100644
--- a/packages/backend/server/src/models/doc.ts
+++ b/packages/backend/server/src/models/doc.ts
@@ -265,6 +265,21 @@ export class DocModel extends BaseModel {
     };
   }
 
+  /**
+   * Delete expired histories.
+   */
+  async deleteExpiredHistories() {
+    const { count } = await this.db.snapshotHistory.deleteMany({
+      where: {
+        expiredAt: {
+          lte: new Date(),
+        },
+      },
+    });
+    this.logger.log(`Deleted ${count} expired histories`);
+    return count;
+  }
+
   // #endregion
 
   // #region Doc