diff --git a/packages/backend/server/migrations/20231024095005_updates_pkey/migration.sql b/packages/backend/server/migrations/20231024095005_updates_pkey/migration.sql
new file mode 100644
index 0000000000..79958f1b78
--- /dev/null
+++ b/packages/backend/server/migrations/20231024095005_updates_pkey/migration.sql
@@ -0,0 +1,14 @@
+/*
+  Warnings:
+
+  - The primary key for the `updates` table will be changed. If it partially fails, the table could be left without primary key constraint.
+  - You are about to drop the column `object_id` on the `updates` table. All the data in the column will be lost.
+
+*/
+-- DropIndex
+DROP INDEX "updates_workspace_id_guid_seq_key";
+
+-- AlterTable
+ALTER TABLE "updates" DROP CONSTRAINT "updates_pkey",
+DROP COLUMN "object_id",
+ADD CONSTRAINT "updates_pkey" PRIMARY KEY ("workspace_id", "guid", "seq");
diff --git a/packages/backend/server/schema.prisma b/packages/backend/server/schema.prisma
index 70c6edf834..5189bbab25 100644
--- a/packages/backend/server/schema.prisma
+++ b/packages/backend/server/schema.prisma
@@ -143,16 +143,14 @@ model Snapshot {
   @@map("snapshots")
 }
 
-// backup during other update operation queue downtime
 model Update {
-  objectId    String   @id @default(uuid()) @map("object_id") @db.VarChar
   workspaceId String   @map("workspace_id") @db.VarChar
   id          String   @map("guid") @db.VarChar
   seq         Int      @db.Integer
   blob        Bytes    @db.ByteA
   createdAt   DateTime @default(now()) @map("created_at") @db.Timestamptz(6)
 
-  @@unique([workspaceId, id, seq])
+  @@id([workspaceId, id, seq])
   @@map("updates")
 }
 
diff --git a/packages/backend/server/src/modules/doc/manager.ts b/packages/backend/server/src/modules/doc/manager.ts
index 0dec55d1da..9f9ca2e87a 100644
--- a/packages/backend/server/src/modules/doc/manager.ts
+++ b/packages/backend/server/src/modules/doc/manager.ts
@@ -264,15 +264,15 @@ export class DocManager
    * get pending updates
    */
   async getUpdates(workspaceId: string, guid: string) {
-    return this.db.update.findMany({
+    const updates = await this.db.update.findMany({
       where: {
         workspaceId,
         id: guid,
       },
-      orderBy: {
-        seq: 'asc',
-      },
     });
+
+    // perf(memory): avoid sorting in db
+    return updates.sort((a, b) => (a.createdAt < b.createdAt ? -1 : 1));
   }
 
   /**