diff --git a/packages/backend/server/migrations/20241023065619_blobs/migration.sql b/packages/backend/server/migrations/20241023065619_blobs/migration.sql
new file mode 100644
index 0000000000000..22fac2f05801b
--- /dev/null
+++ b/packages/backend/server/migrations/20241023065619_blobs/migration.sql
@@ -0,0 +1,14 @@
+-- CreateTable
+CREATE TABLE "blobs" (
+    "workspace_id" VARCHAR NOT NULL,
+    "key" VARCHAR NOT NULL,
+    "size" INTEGER NOT NULL,
+    "mime" VARCHAR NOT NULL,
+    "created_at" TIMESTAMPTZ(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    "deleted_at" TIMESTAMPTZ(3),
+
+    CONSTRAINT "blobs_pkey" PRIMARY KEY ("workspace_id","key")
+);
+
+-- AddForeignKey
+ALTER TABLE "blobs" ADD CONSTRAINT "blobs_workspace_id_fkey" FOREIGN KEY ("workspace_id") REFERENCES "workspaces"("id") ON DELETE CASCADE ON UPDATE CASCADE;
diff --git a/packages/backend/server/schema.prisma b/packages/backend/server/schema.prisma
index acf2df7fa647d..9086965c81708 100644
--- a/packages/backend/server/schema.prisma
+++ b/packages/backend/server/schema.prisma
@@ -106,6 +106,7 @@ model Workspace {
   permissions     WorkspaceUserPermission[]
   pagePermissions WorkspacePageUserPermission[]
   features        WorkspaceFeature[]
+  blobs           Blob[]
 
   @@map("workspaces")
 }
@@ -335,7 +336,7 @@ model UserSubscription {
   // yearly/monthly/lifetime
   recurring            String    @db.VarChar(20)
   // onetime subscription or anything else
-  variant              String?    @db.VarChar(20)
+  variant              String?   @db.VarChar(20)
   // subscription.id, null for linefetime payment or one time payment subscription
   stripeSubscriptionId String?   @unique @map("stripe_subscription_id")
   // subscription.status, active/past_due/canceled/unpaid...
@@ -499,3 +500,20 @@ model RuntimeConfig {
   @@unique([module, key])
   @@map("app_runtime_settings")
 }
+
+// Blob table only exists for fast non-data queries.
+// like, total size of blobs in a workspace, or blob list for sync service.
+// it should only be a map of metadata of blobs stored anywhere else
+model Blob {
+  workspaceId String   @map("workspace_id") @db.VarChar
+  key         String   @db.VarChar
+  size        Int      @db.Integer
+  mime        String   @db.VarChar
+  createdAt   DateTime @default(now()) @map("created_at") @db.Timestamptz(3)
+  deletedAt   DateTime? @map("deleted_at") @db.Timestamptz(3)
+
+  workspace Workspace @relation(fields: [workspaceId], references: [id], onDelete: Cascade)
+
+  @@id([workspaceId, key])
+  @@map("blobs")
+}
diff --git a/packages/backend/server/src/core/doc/storage/doc.ts b/packages/backend/server/src/core/doc/storage/doc.ts
index 6010855484812..4bcbf4067be68 100644
--- a/packages/backend/server/src/core/doc/storage/doc.ts
+++ b/packages/backend/server/src/core/doc/storage/doc.ts
@@ -1,8 +1,10 @@
 import {
   applyUpdate,
+  diffUpdate,
   Doc,
   encodeStateAsUpdate,
   encodeStateVector,
+  encodeStateVectorFromUpdate,
   mergeUpdates,
   UndoManager,
 } from 'yjs';
@@ -19,6 +21,12 @@ export interface DocRecord {
   editor?: string;
 }
 
+export interface DocDiff {
+  missing: Uint8Array;
+  state: Uint8Array;
+  timestamp: number;
+}
+
 export interface DocUpdate {
   bin: Uint8Array;
   timestamp: number;
@@ -96,6 +104,27 @@ export abstract class DocStorageAdapter extends Connection {
     return snapshot;
   }
 
+  async getDocDiff(
+    spaceId: string,
+    docId: string,
+    stateVector?: Uint8Array
+  ): Promise<DocDiff | null> {
+    const doc = await this.getDoc(spaceId, docId);
+
+    if (!doc) {
+      return null;
+    }
+
+    const missing = stateVector ? diffUpdate(doc.bin, stateVector) : doc.bin;
+    const state = encodeStateVectorFromUpdate(doc.bin);
+
+    return {
+      missing,
+      state,
+      timestamp: doc.timestamp,
+    };
+  }
+
   abstract pushDocUpdates(
     spaceId: string,
     docId: string,
diff --git a/packages/backend/server/src/core/doc/storage/index.ts b/packages/backend/server/src/core/doc/storage/index.ts
index 6ba0e23dd1119..7521fb6cca367 100644
--- a/packages/backend/server/src/core/doc/storage/index.ts
+++ b/packages/backend/server/src/core/doc/storage/index.ts
@@ -1,4 +1,6 @@
-// TODO(@forehalo): share with frontend
+// This is a totally copy of definitions in [@affine/space-store]
+// because currently importing cross workspace package from [@affine/server] is not yet supported
+// should be kept updated with the original definitions in [@affine/space-store]
 import type { BlobStorageAdapter } from './blob';
 import { Connection } from './connection';
 import type { DocStorageAdapter } from './doc';
diff --git a/packages/backend/server/src/core/quota/resolver.ts b/packages/backend/server/src/core/quota/resolver.ts
index c8afaa2237a01..309f43833ab6d 100644
--- a/packages/backend/server/src/core/quota/resolver.ts
+++ b/packages/backend/server/src/core/quota/resolver.ts
@@ -11,6 +11,7 @@ import { CurrentUser } from '../auth/session';
 import { EarlyAccessType } from '../features';
 import { UserType } from '../user';
 import { QuotaService } from './service';
+import { QuotaManagementService } from './storage';
 
 registerEnumType(EarlyAccessType, {
   name: 'EarlyAccessType',
@@ -55,9 +56,18 @@ class UserQuotaType {
   humanReadable!: UserQuotaHumanReadableType;
 }
 
+@ObjectType('UserQuotaUsage')
+class UserQuotaUsageType {
+  @Field(() => SafeIntResolver, { name: 'storageQuota' })
+  storageQuota!: number;
+}
+
 @Resolver(() => UserType)
 export class QuotaManagementResolver {
-  constructor(private readonly quota: QuotaService) {}
+  constructor(
+    private readonly quota: QuotaService,
+    private readonly management: QuotaManagementService
+  ) {}
 
   @ResolveField(() => UserQuotaType, { name: 'quota', nullable: true })
   async getQuota(@CurrentUser() me: UserType) {
@@ -65,4 +75,15 @@ export class QuotaManagementResolver {
 
     return quota.feature;
   }
+
+  @ResolveField(() => UserQuotaUsageType, { name: 'quotaUsage' })
+  async getQuotaUsage(
+    @CurrentUser() me: UserType
+  ): Promise<UserQuotaUsageType> {
+    const usage = await this.management.getUserStorageUsage(me.id);
+
+    return {
+      storageQuota: usage,
+    };
+  }
 }
diff --git a/packages/backend/server/src/core/quota/storage.ts b/packages/backend/server/src/core/quota/storage.ts
index ac77ace364f93..4e6910d635c50 100644
--- a/packages/backend/server/src/core/quota/storage.ts
+++ b/packages/backend/server/src/core/quota/storage.ts
@@ -40,7 +40,7 @@ export class QuotaManagementService {
     };
   }
 
-  async getUserUsage(userId: string) {
+  async getUserStorageUsage(userId: string) {
     const workspaces = await this.permissions.getOwnedWorkspaces(userId);
 
     const sizes = await Promise.allSettled(
@@ -88,7 +88,7 @@ export class QuotaManagementService {
   async getQuotaCalculator(userId: string) {
     const quota = await this.getUserQuota(userId);
     const { storageQuota, businessBlobLimit } = quota;
-    const usedSize = await this.getUserUsage(userId);
+    const usedSize = await this.getUserStorageUsage(userId);
 
     return this.generateQuotaCalculator(
       storageQuota,
@@ -128,7 +128,7 @@ export class QuotaManagementService {
       },
     } = await this.quota.getUserQuota(owner.id);
     // get all workspaces size of owner used
-    const usedSize = await this.getUserUsage(owner.id);
+    const usedSize = await this.getUserStorageUsage(owner.id);
     // relax restrictions if workspace has unlimited feature
     // todo(@darkskygit): need a mechanism to allow feature as a middleware to edit quota
     const unlimited = await this.feature.hasWorkspaceFeature(
diff --git a/packages/backend/server/src/core/storage/wrappers/blob.ts b/packages/backend/server/src/core/storage/wrappers/blob.ts
index 9aa991ab4b924..b6a80d31fe7cb 100644
--- a/packages/backend/server/src/core/storage/wrappers/blob.ts
+++ b/packages/backend/server/src/core/storage/wrappers/blob.ts
@@ -1,12 +1,12 @@
-import { Injectable } from '@nestjs/common';
+import { Injectable, Logger } from '@nestjs/common';
+import { PrismaClient } from '@prisma/client';
 
 import {
-  type BlobInputType,
-  Cache,
   Config,
   EventEmitter,
   type EventPayload,
-  type ListObjectsMetadata,
+  type GetObjectMetadata,
+  ListObjectsMetadata,
   OnEvent,
   type StorageProvider,
   StorageProviderFactory,
@@ -14,62 +14,164 @@ import {
 
 @Injectable()
 export class WorkspaceBlobStorage {
+  private readonly logger = new Logger(WorkspaceBlobStorage.name);
   public readonly provider: StorageProvider;
 
   constructor(
     private readonly config: Config,
     private readonly event: EventEmitter,
     private readonly storageFactory: StorageProviderFactory,
-    private readonly cache: Cache
+    private readonly db: PrismaClient
   ) {
     this.provider = this.storageFactory.create(this.config.storages.blob);
   }
 
-  async put(workspaceId: string, key: string, blob: BlobInputType) {
-    await this.provider.put(`${workspaceId}/${key}`, blob);
-    await this.cache.delete(`blob-list:${workspaceId}`);
+  async put(workspaceId: string, key: string, blob: Buffer, mime: string) {
+    const meta: GetObjectMetadata = {
+      contentType: mime,
+      contentLength: blob.byteLength,
+      lastModified: new Date(),
+    };
+    await this.provider.put(`${workspaceId}/${key}`, blob, meta);
+    this.trySyncBlobMeta(workspaceId, key, meta);
   }
 
   async get(workspaceId: string, key: string) {
-    return this.provider.get(`${workspaceId}/${key}`);
+    const blob = await this.provider.get(`${workspaceId}/${key}`);
+    this.trySyncBlobMeta(workspaceId, key, blob.metadata);
+    return blob;
   }
 
   async list(workspaceId: string) {
-    const cachedList = await this.cache.list<ListObjectsMetadata>(
-      `blob-list:${workspaceId}`,
-      0,
-      -1
-    );
-
-    if (cachedList.length > 0) {
-      return cachedList;
+    const blobsInDb = await this.db.blob.findMany({
+      where: {
+        workspaceId,
+        deletedAt: null,
+      },
+    });
+
+    if (blobsInDb.length > 0) {
+      return blobsInDb;
     }
 
     const blobs = await this.provider.list(workspaceId + '/');
+    this.trySyncBlobsMeta(workspaceId, blobs);
+
+    return blobs.map(blob => ({
+      key: blob.key,
+      size: blob.contentLength,
+      createdAt: blob.lastModified,
+      mime: 'application/octet-stream',
+    }));
+  }
 
-    blobs.forEach(item => {
-      // trim workspace prefix
-      item.key = item.key.slice(workspaceId.length + 1);
-    });
-
-    await this.cache.pushBack(`blob-list:${workspaceId}`, ...blobs);
-
-    return blobs;
+  async delete(workspaceId: string, key: string, permanently = false) {
+    if (permanently) {
+      await this.provider.delete(`${workspaceId}/${key}`);
+      await this.db.blob.deleteMany({
+        where: {
+          workspaceId,
+          key,
+        },
+      });
+    } else {
+      await this.db.blob.update({
+        where: {
+          workspaceId_key: {
+            workspaceId,
+            key,
+          },
+        },
+        data: {
+          deletedAt: new Date(),
+        },
+      });
+    }
   }
 
-  /**
-   * we won't really delete the blobs until the doc blobs manager is implemented sounded
-   */
-  async delete(_workspaceId: string, _key: string) {
-    // return this.provider.delete(`${workspaceId}/${key}`);
+  async release(workspaceId: string) {
+    const deletedBlobs = await this.db.blob.findMany({
+      where: {
+        workspaceId,
+        deletedAt: {
+          not: null,
+        },
+      },
+    });
+
+    deletedBlobs.forEach(blob => {
+      this.event.emit('workspace.blob.deleted', {
+        workspaceId: workspaceId,
+        key: blob.key,
+      });
+    });
   }
 
   async totalSize(workspaceId: string) {
     const blobs = await this.list(workspaceId);
-    // how could we ignore the ones get soft-deleted?
     return blobs.reduce((acc, item) => acc + item.size, 0);
   }
 
+  private trySyncBlobsMeta(workspaceId: string, blobs: ListObjectsMetadata[]) {
+    for (const blob of blobs) {
+      this.trySyncBlobMeta(workspaceId, blob.key, {
+        contentType: 'application/octet-stream',
+        ...blob,
+      });
+    }
+  }
+
+  private trySyncBlobMeta(
+    workspaceId: string,
+    key: string,
+    meta?: GetObjectMetadata
+  ) {
+    setImmediate(() => {
+      this.syncBlobMeta(workspaceId, key, meta).catch(() => {
+        /* never throw */
+      });
+    });
+  }
+
+  private async syncBlobMeta(
+    workspaceId: string,
+    key: string,
+    meta?: GetObjectMetadata
+  ) {
+    try {
+      if (meta) {
+        await this.db.blob.upsert({
+          where: {
+            workspaceId_key: {
+              workspaceId,
+              key,
+            },
+          },
+          update: {
+            mime: meta.contentType,
+            size: meta.contentLength,
+          },
+          create: {
+            workspaceId,
+            key,
+            mime: meta.contentType,
+            size: meta.contentLength,
+          },
+        });
+      } else {
+        await this.db.blob.deleteMany({
+          where: {
+            workspaceId,
+            key,
+          },
+        });
+      }
+    } catch (e) {
+      // never throw
+      this.logger.error('failed to sync blob meta to DB', e);
+    }
+  }
+
   @OnEvent('workspace.deleted')
   async onWorkspaceDeleted(workspaceId: EventPayload<'workspace.deleted'>) {
     const blobs = await this.list(workspaceId);
@@ -78,7 +180,7 @@ export class WorkspaceBlobStorage {
     blobs.forEach(blob => {
       this.event.emit('workspace.blob.deleted', {
         workspaceId: workspaceId,
-        name: blob.key,
+        key: blob.key,
       });
     });
   }
@@ -86,8 +188,14 @@ export class WorkspaceBlobStorage {
   @OnEvent('workspace.blob.deleted')
   async onDeleteWorkspaceBlob({
     workspaceId,
-    name,
+    key,
   }: EventPayload<'workspace.blob.deleted'>) {
-    await this.delete(workspaceId, name);
+    await this.db.blob.deleteMany({
+      where: {
+        workspaceId,
+        key,
+      },
+    });
+    await this.delete(workspaceId, key);
   }
 }
diff --git a/packages/backend/server/src/core/sync/gateway.ts b/packages/backend/server/src/core/sync/gateway.ts
index d5686c658fd42..15c813b4123ab 100644
--- a/packages/backend/server/src/core/sync/gateway.ts
+++ b/packages/backend/server/src/core/sync/gateway.ts
@@ -8,7 +8,6 @@ import {
   WebSocketGateway,
 } from '@nestjs/websockets';
 import { Socket } from 'socket.io';
-import { diffUpdate, encodeStateVectorFromUpdate } from 'yjs';
 
 import {
   AlreadyInSpace,
@@ -83,6 +82,9 @@ interface LeaveSpaceAwarenessMessage {
   docId: string;
 }
 
+/**
+ * @deprecated
+ */
 interface PushDocUpdatesMessage {
   spaceType: SpaceType;
   spaceId: string;
@@ -90,6 +92,13 @@ interface PushDocUpdatesMessage {
   updates: string[];
 }
 
+interface PushDocUpdateMessage {
+  spaceType: SpaceType;
+  spaceId: string;
+  docId: string;
+  update: string;
+}
+
 interface LoadDocMessage {
   spaceType: SpaceType;
   spaceId: string;
@@ -114,6 +123,7 @@ interface UpdateAwarenessMessage {
   docId: string;
   awarenessUpdate: string;
 }
+
 @WebSocketGateway()
 export class SpaceSyncGateway
   implements OnGatewayConnection, OnGatewayDisconnect
@@ -182,26 +192,6 @@ export class SpaceSyncGateway
     }
   }
 
-  async joinWorkspace(
-    client: Socket,
-    room: `${string}:${'sync' | 'awareness'}`
-  ) {
-    await client.join(room);
-  }
-
-  async leaveWorkspace(
-    client: Socket,
-    room: `${string}:${'sync' | 'awareness'}`
-  ) {
-    await client.leave(room);
-  }
-
-  assertInWorkspace(client: Socket, room: `${string}:${'sync' | 'awareness'}`) {
-    if (!client.rooms.has(room)) {
-      throw new NotInSpace({ spaceId: room.split(':')[0] });
-    }
-  }
-
   // v3
   @SubscribeMessage('space:join')
   async onJoinSpace(
@@ -233,36 +223,33 @@ export class SpaceSyncGateway
     @MessageBody()
     { spaceType, spaceId, docId, stateVector }: LoadDocMessage
   ): Promise<
-    EventResponse<{ missing: string; state?: string; timestamp: number }>
+    EventResponse<{ missing: string; state: string; timestamp: number }>
   > {
     const adapter = this.selectAdapter(client, spaceType);
     adapter.assertIn(spaceId);
 
-    const doc = await adapter.get(spaceId, docId);
+    const doc = await adapter.diff(
+      spaceId,
+      docId,
+      stateVector ? Buffer.from(stateVector, 'base64') : undefined
+    );
 
     if (!doc) {
       throw new DocNotFound({ spaceId, docId });
     }
 
-    const missing = Buffer.from(
-      stateVector
-        ? diffUpdate(doc.bin, Buffer.from(stateVector, 'base64'))
-        : doc.bin
-    ).toString('base64');
-
-    const state = Buffer.from(encodeStateVectorFromUpdate(doc.bin)).toString(
-      'base64'
-    );
-
     return {
       data: {
-        missing,
-        state,
+        missing: Buffer.from(doc.missing).toString('base64'),
+        state: Buffer.from(doc.state).toString('base64'),
         timestamp: doc.timestamp,
       },
     };
   }
 
+  /**
+   * @deprecated use [space:push-doc-update] instead, client should always merge updates on their own
+   */
   @SubscribeMessage('space:push-doc-updates')
   async onReceiveDocUpdates(
     @ConnectedSocket() client: Socket,
@@ -307,6 +294,51 @@ export class SpaceSyncGateway
     };
   }
 
+  @SubscribeMessage('space:push-doc-update')
+  async onReceiveDocUpdate(
+    @ConnectedSocket() client: Socket,
+    @CurrentUser() user: CurrentUser,
+    @MessageBody()
+    message: PushDocUpdateMessage
+  ): Promise<EventResponse<{ accepted: true; timestamp?: number }>> {
+    const { spaceType, spaceId, docId, update } = message;
+    const adapter = this.selectAdapter(client, spaceType);
+
+    // TODO(@forehalo): we might need to check write permission before push updates
+    const timestamp = await adapter.push(
+      spaceId,
+      docId,
+      [Buffer.from(update, 'base64')],
+      user.id
+    );
+
+    // TODO(@forehalo): separate different version of clients into different rooms,
+    // so the clients won't receive useless updates events
+    client.to(adapter.room(spaceId)).emit('space:broadcast-doc-updates', {
+      spaceType,
+      spaceId,
+      docId,
+      updates: [update],
+      timestamp,
+    });
+
+    client.to(adapter.room(spaceId)).emit('space:broadcast-doc-update', {
+      spaceType,
+      spaceId,
+      docId,
+      update,
+      timestamp,
+      editor: user.id,
+    });
+
+    return {
+      data: {
+        accepted: true,
+        timestamp,
+      },
+    };
+  }
+
   @SubscribeMessage('space:load-doc-timestamps')
   async onLoadDocTimestamps(
     @ConnectedSocket() client: Socket,
@@ -600,9 +632,9 @@ abstract class SyncSocketAdapter {
     return this.storage.pushDocUpdates(spaceId, docId, updates, editorId);
   }
 
-  get(spaceId: string, docId: string) {
+  diff(spaceId: string, docId: string, stateVector?: Uint8Array) {
     this.assertIn(spaceId);
-    return this.storage.getDoc(spaceId, docId);
+    return this.storage.getDocDiff(spaceId, docId, stateVector);
   }
 
   getTimestamps(spaceId: string, timestamp?: number) {
@@ -630,9 +662,9 @@ class WorkspaceSyncAdapter extends SyncSocketAdapter {
     return super.push(spaceId, id.guid, updates, editorId);
   }
 
-  override get(spaceId: string, docId: string) {
+  override diff(spaceId: string, docId: string, stateVector?: Uint8Array) {
     const id = new DocID(docId, spaceId);
-    return this.storage.getDoc(spaceId, id.guid);
+    return this.storage.getDocDiff(spaceId, id.guid, stateVector);
   }
 
   async assertAccessible(
diff --git a/packages/backend/server/src/core/workspaces/resolvers/blob.ts b/packages/backend/server/src/core/workspaces/resolvers/blob.ts
index 82c8f6c1ca986..7edef0f431b6e 100644
--- a/packages/backend/server/src/core/workspaces/resolvers/blob.ts
+++ b/packages/backend/server/src/core/workspaces/resolvers/blob.ts
@@ -1,29 +1,40 @@
 import { Logger, UseGuards } from '@nestjs/common';
 import {
   Args,
+  Field,
   Int,
   Mutation,
+  ObjectType,
   Parent,
   Query,
   ResolveField,
   Resolver,
 } from '@nestjs/graphql';
-import { SafeIntResolver } from 'graphql-scalars';
 import GraphQLUpload from 'graphql-upload/GraphQLUpload.mjs';
 
 import type { FileUpload } from '../../../fundamentals';
-import {
-  BlobQuotaExceeded,
-  CloudThrottlerGuard,
-  MakeCache,
-  PreventCache,
-} from '../../../fundamentals';
+import { BlobQuotaExceeded, CloudThrottlerGuard } from '../../../fundamentals';
 import { CurrentUser } from '../../auth';
 import { Permission, PermissionService } from '../../permission';
 import { QuotaManagementService } from '../../quota';
 import { WorkspaceBlobStorage } from '../../storage';
 import { WorkspaceBlobSizes, WorkspaceType } from '../types';
 
+@ObjectType()
+class ListedBlob {
+  @Field()
+  key!: string;
+
+  @Field()
+  mime!: string;
+
+  @Field()
+  size!: number;
+
+  @Field()
+  createdAt!: string;
+}
+
 @UseGuards(CloudThrottlerGuard)
 @Resolver(() => WorkspaceType)
 export class WorkspaceBlobResolver {
@@ -34,7 +45,7 @@ export class WorkspaceBlobResolver {
     private readonly storage: WorkspaceBlobStorage
   ) {}
 
-  @ResolveField(() => [String], {
+  @ResolveField(() => [ListedBlob], {
     description: 'List blobs of workspace',
     complexity: 2,
   })
@@ -44,9 +55,7 @@ export class WorkspaceBlobResolver {
   ) {
     await this.permissions.checkWorkspace(workspace.id, user.id);
 
-    return this.storage
-      .list(workspace.id)
-      .then(list => list.map(item => item.key));
+    return this.storage.list(workspace.id);
   }
 
   @ResolveField(() => Int, {
@@ -64,7 +73,6 @@ export class WorkspaceBlobResolver {
     description: 'List blobs of workspace',
     deprecationReason: 'use `workspace.blobs` instead',
   })
-  @MakeCache(['blobs'], ['workspaceId'])
   async listBlobs(
     @CurrentUser() user: CurrentUser,
     @Args('workspaceId') workspaceId: string
@@ -76,42 +84,15 @@ export class WorkspaceBlobResolver {
       .then(list => list.map(item => item.key));
   }
 
-  /**
-   * @deprecated use `user.storageUsage` instead
-   */
   @Query(() => WorkspaceBlobSizes, {
-    deprecationReason: 'use `user.storageUsage` instead',
+    deprecationReason: 'use `user.quotaUsage` instead',
   })
   async collectAllBlobSizes(@CurrentUser() user: CurrentUser) {
-    const size = await this.quota.getUserUsage(user.id);
+    const size = await this.quota.getUserStorageUsage(user.id);
     return { size };
   }
 
-  /**
-   * @deprecated mutation `setBlob` will check blob limit & quota usage
-   */
-  @Query(() => WorkspaceBlobSizes, {
-    deprecationReason: 'no more needed',
-  })
-  async checkBlobSize(
-    @CurrentUser() user: CurrentUser,
-    @Args('workspaceId') workspaceId: string,
-    @Args('size', { type: () => SafeIntResolver }) blobSize: number
-  ) {
-    const canWrite = await this.permissions.tryCheckWorkspace(
-      workspaceId,
-      user.id,
-      Permission.Write
-    );
-    if (canWrite) {
-      const size = await this.quota.checkBlobQuota(workspaceId, blobSize);
-      return { size };
-    }
-    return false;
-  }
-
   @Mutation(() => String)
-  @PreventCache(['blobs'], ['workspaceId'])
   async setBlob(
     @CurrentUser() user: CurrentUser,
     @Args('workspaceId') workspaceId: string,
@@ -155,20 +136,44 @@ export class WorkspaceBlobResolver {
       });
     });
 
-    await this.storage.put(workspaceId, blob.filename, buffer);
+    await this.storage.put(workspaceId, blob.filename, buffer, blob.mimetype);
     return blob.filename;
   }
 
   @Mutation(() => Boolean)
-  @PreventCache(['blobs'], ['workspaceId'])
   async deleteBlob(
     @CurrentUser() user: CurrentUser,
     @Args('workspaceId') workspaceId: string,
-    @Args('hash') name: string
+    @Args('hash', {
+      type: () => String,
+      deprecationReason: 'use parameter [key]',
+      nullable: true,
+    })
+    hash?: string,
+    @Args('key', { type: () => String, nullable: true }) key?: string,
+    @Args('permanently', { type: () => Boolean, defaultValue: false })
+    permanently = false
+  ) {
+    key = key ?? hash;
+    if (!key) {
+      return false;
+    }
+
+    await this.permissions.checkWorkspace(workspaceId, user.id);
+
+    await this.storage.delete(workspaceId, key, permanently);
+
+    return true;
+  }
+
+  @Mutation(() => Boolean)
+  async releaseDeletedBlobs(
+    @CurrentUser() user: CurrentUser,
+    @Args('workspaceId') workspaceId: string
   ) {
     await this.permissions.checkWorkspace(workspaceId, user.id);
 
-    await this.storage.delete(workspaceId, name);
+    await this.storage.release(workspaceId);
 
     return true;
   }
diff --git a/packages/backend/server/src/fundamentals/event/def.ts b/packages/backend/server/src/fundamentals/event/def.ts
index 33db14b7a2832..c9cb42381350a 100644
--- a/packages/backend/server/src/fundamentals/event/def.ts
+++ b/packages/backend/server/src/fundamentals/event/def.ts
@@ -7,7 +7,7 @@ export interface WorkspaceEvents {
   blob: {
     deleted: Payload<{
       workspaceId: Workspace['id'];
-      name: string;
+      key: string;
     }>;
   };
 }
diff --git a/packages/backend/server/src/fundamentals/storage/providers/fs.ts b/packages/backend/server/src/fundamentals/storage/providers/fs.ts
index 282396c98d0f0..c271d93ece789 100644
--- a/packages/backend/server/src/fundamentals/storage/providers/fs.ts
+++ b/packages/backend/server/src/fundamentals/storage/providers/fs.ts
@@ -119,7 +119,7 @@ export class FsStorageProvider implements StorageProvider {
             results.push({
               key: res,
               lastModified: stat.mtime,
-              size: stat.size,
+              contentLength: stat.size,
             });
           }
         }
diff --git a/packages/backend/server/src/fundamentals/storage/providers/provider.ts b/packages/backend/server/src/fundamentals/storage/providers/provider.ts
index 46f8ef688db35..5b2bad24b2473 100644
--- a/packages/backend/server/src/fundamentals/storage/providers/provider.ts
+++ b/packages/backend/server/src/fundamentals/storage/providers/provider.ts
@@ -21,7 +21,7 @@ export interface PutObjectMetadata {
 export interface ListObjectsMetadata {
   key: string;
   lastModified: Date;
-  size: number;
+  contentLength: number;
 }
 
 export type BlobInputType = Buffer | Readable | string;
diff --git a/packages/backend/server/src/fundamentals/storage/providers/utils.ts b/packages/backend/server/src/fundamentals/storage/providers/utils.ts
index a0eab7d8c5451..1f9fc52ed6e6e 100644
--- a/packages/backend/server/src/fundamentals/storage/providers/utils.ts
+++ b/packages/backend/server/src/fundamentals/storage/providers/utils.ts
@@ -24,7 +24,7 @@ export async function autoMetadata(
   try {
     // length
     if (!metadata.contentLength) {
-      metadata.contentLength = blob.length;
+      metadata.contentLength = blob.byteLength;
     }
 
     // checksum
diff --git a/packages/backend/server/src/plugins/storage/providers/s3.ts b/packages/backend/server/src/plugins/storage/providers/s3.ts
index 3a242704dbf28..3aabf11f747d6 100644
--- a/packages/backend/server/src/plugins/storage/providers/s3.ts
+++ b/packages/backend/server/src/plugins/storage/providers/s3.ts
@@ -140,7 +140,7 @@ export class S3StorageProvider implements StorageProvider {
             listResult.Contents.map(r => ({
               key: r.Key!,
               lastModified: r.LastModified!,
-              size: r.Size!,
+              contentLength: r.Size!,
             }))
           );
         }
diff --git a/packages/backend/server/src/schema.gql b/packages/backend/server/src/schema.gql
index 5d129eb89e1b4..58624ce58991e 100644
--- a/packages/backend/server/src/schema.gql
+++ b/packages/backend/server/src/schema.gql
@@ -411,6 +411,13 @@ input ListUserInput {
   skip: Int = 0
 }
 
+type ListedBlob {
+  createdAt: String!
+  key: String!
+  mime: String!
+  size: Int!
+}
+
 input ManageUserInput {
   """User email"""
   email: String
@@ -457,7 +464,7 @@ type Mutation {
   """Create a new workspace"""
   createWorkspace(init: Upload): WorkspaceType!
   deleteAccount: DeleteAccount!
-  deleteBlob(hash: String!, workspaceId: String!): Boolean!
+  deleteBlob(hash: String @deprecated(reason: "use parameter [key]"), key: String, permanently: Boolean! = false, workspaceId: String!): Boolean!
 
   """Delete a user account"""
   deleteUser(id: String!): DeleteAccount!
@@ -469,6 +476,7 @@ type Mutation {
   leaveWorkspace(sendLeaveMail: Boolean, workspaceId: String!, workspaceName: String!): Boolean!
   publishPage(mode: PublicPageMode = Page, pageId: String!, workspaceId: String!): WorkspacePage!
   recoverDoc(guid: String!, timestamp: DateTime!, workspaceId: String!): DateTime!
+  releaseDeletedBlobs(workspaceId: String!): Boolean!
 
   """Remove user avatar"""
   removeAvatar: RemoveAvatar!
@@ -541,8 +549,7 @@ enum PublicPageMode {
 }
 
 type Query {
-  checkBlobSize(size: SafeInt!, workspaceId: String!): WorkspaceBlobSizes! @deprecated(reason: "no more needed")
-  collectAllBlobSizes: WorkspaceBlobSizes! @deprecated(reason: "use `user.storageUsage` instead")
+  collectAllBlobSizes: WorkspaceBlobSizes! @deprecated(reason: "use `user.quotaUsage` instead")
 
   """Get current user"""
   currentUser: UserType
@@ -825,6 +832,10 @@ type UserQuotaHumanReadable {
   storageQuota: String!
 }
 
+type UserQuotaUsage {
+  storageQuota: SafeInt!
+}
+
 type UserSubscription {
   canceledAt: DateTime
   createdAt: DateTime!
@@ -874,6 +885,7 @@ type UserType {
   """User name"""
   name: String!
   quota: UserQuota
+  quotaUsage: UserQuotaUsage!
   subscription(plan: SubscriptionPlan = Pro): UserSubscription @deprecated(reason: "use `UserType.subscriptions`")
   subscriptions: [UserSubscription!]!
   token: tokenType! @deprecated(reason: "use [/api/auth/sign-in?native=true] instead")
@@ -907,7 +919,7 @@ type WorkspaceType {
   availableFeatures: [FeatureType!]!
 
   """List blobs of workspace"""
-  blobs: [String!]!
+  blobs: [ListedBlob!]!
 
   """Blobs size of workspace"""
   blobsSize: Int!
diff --git a/packages/backend/server/tests/utils/blobs.ts b/packages/backend/server/tests/utils/blobs.ts
index 514fbeee468d1..f6832c41c401d 100644
--- a/packages/backend/server/tests/utils/blobs.ts
+++ b/packages/backend/server/tests/utils/blobs.ts
@@ -54,35 +54,16 @@ export async function collectAllBlobSizes(
     .send({
       query: `
               query {
-                collectAllBlobSizes {
-                  size
+                currentUser {
+                  quotaUsage {
+                    storageQuota
+                  }
                 }
               }
             `,
     })
     .expect(200);
-  return res.body.data.collectAllBlobSizes.size;
-}
-
-export async function checkBlobSize(
-  app: INestApplication,
-  token: string,
-  workspaceId: string,
-  size: number
-): Promise<number> {
-  const res = await request(app.getHttpServer())
-    .post(gql)
-    .auth(token, { type: 'bearer' })
-    .send({
-      query: `query checkBlobSize($workspaceId: String!, $size: SafeInt!) {
-          checkBlobSize(workspaceId: $workspaceId, size: $size) {
-            size
-          }
-        }`,
-      variables: { workspaceId, size },
-    })
-    .expect(200);
-  return res.body.data.checkBlobSize.size;
+  return res.body.data.currentUser.quotaUsage.storageQuota;
 }
 
 export async function setBlob(
diff --git a/packages/backend/server/tests/workspace-blobs.spec.ts b/packages/backend/server/tests/workspace/blobs.e2e.ts
similarity index 76%
rename from packages/backend/server/tests/workspace-blobs.spec.ts
rename to packages/backend/server/tests/workspace/blobs.e2e.ts
index 3e81d5fbf7aff..08dc6947fce4d 100644
--- a/packages/backend/server/tests/workspace-blobs.spec.ts
+++ b/packages/backend/server/tests/workspace/blobs.e2e.ts
@@ -2,11 +2,10 @@ import type { INestApplication } from '@nestjs/common';
 import test from 'ava';
 import request from 'supertest';
 
-import { AppModule } from '../src/app.module';
-import { FeatureManagementService, FeatureType } from '../src/core/features';
-import { QuotaService, QuotaType } from '../src/core/quota';
+import { AppModule } from '../../src/app.module';
+import { FeatureManagementService, FeatureType } from '../../src/core/features';
+import { QuotaService, QuotaType } from '../../src/core/quota';
 import {
-  checkBlobSize,
   collectAllBlobSizes,
   createTestingApp,
   createWorkspace,
@@ -14,7 +13,7 @@ import {
   listBlobs,
   setBlob,
   signUp,
-} from './utils';
+} from '../utils';
 
 const OneMB = 1024 * 1024;
 
@@ -114,58 +113,6 @@ test('should calc all blobs size', async t => {
 
   const size = await collectAllBlobSizes(app, u1.token.token);
   t.is(size, 8, 'failed to collect all blob sizes');
-
-  const size1 = await checkBlobSize(
-    app,
-    u1.token.token,
-    workspace1.id,
-    10 * 1024 * 1024 * 1024 - 8
-  );
-  t.is(size1, 0, 'failed to check blob size');
-
-  const size2 = await checkBlobSize(
-    app,
-    u1.token.token,
-    workspace1.id,
-    10 * 1024 * 1024 * 1024 - 7
-  );
-  t.is(size2, -1, 'failed to check blob size');
-});
-
-test('should be able calc quota after switch plan', async t => {
-  const u1 = await signUp(app, 'darksky', 'darksky@affine.pro', '1');
-
-  const workspace1 = await createWorkspace(app, u1.token.token);
-
-  const buffer1 = Buffer.from([0, 0]);
-  await setBlob(app, u1.token.token, workspace1.id, buffer1);
-  const buffer2 = Buffer.from([0, 1]);
-  await setBlob(app, u1.token.token, workspace1.id, buffer2);
-
-  const workspace2 = await createWorkspace(app, u1.token.token);
-
-  const buffer3 = Buffer.from([0, 0]);
-  await setBlob(app, u1.token.token, workspace2.id, buffer3);
-  const buffer4 = Buffer.from([0, 1]);
-  await setBlob(app, u1.token.token, workspace2.id, buffer4);
-
-  const size1 = await checkBlobSize(
-    app,
-    u1.token.token,
-    workspace1.id,
-    10 * 1024 * 1024 * 1024 - 8
-  );
-  t.is(size1, 0, 'failed to check free plan blob size');
-
-  await quota.switchUserQuota(u1.id, QuotaType.ProPlanV1);
-
-  const size2 = await checkBlobSize(
-    app,
-    u1.token.token,
-    workspace1.id,
-    100 * 1024 * 1024 * 1024 - 8
-  );
-  t.is(size2, 0, 'failed to check pro plan blob size');
 });
 
 test('should reject blob exceeded limit', async t => {
diff --git a/packages/common/space-store/package.json b/packages/common/space-store/package.json
index 5db5654d7078e..aa572bb2e3234 100644
--- a/packages/common/space-store/package.json
+++ b/packages/common/space-store/package.json
@@ -7,7 +7,8 @@
   "exports": {
     ".": "./index.ts",
     "./idb": "./src/impls/idb/index.ts",
-    "./idb/v1": "./src/impls/idb/v1/index.ts"
+    "./idb/v1": "./src/impls/idb/v1/index.ts",
+    "./cloud": "./src/impls/cloud/index.ts"
   },
   "dependencies": {
     "@toeverything/infra": "workspace:*",
@@ -17,9 +18,13 @@
     "yjs": "patch:yjs@npm%3A13.6.18#~/.yarn/patches/yjs-npm-13.6.18-ad0d5f7c43.patch"
   },
   "devDependencies": {
-    "idb": "^8.0.0"
+    "@affine/graphql": "workspace:*",
+    "idb": "^8.0.0",
+    "socket.io-client": "^4.7.5"
   },
   "peerDependencies": {
-    "idb": "^8.0.0"
+    "@affine/graphql": "workspace:*",
+    "idb": "^8.0.0",
+    "socket.io-client": "^4.7.5"
   }
 }
diff --git a/packages/common/space-store/src/impls/cloud/blob.ts b/packages/common/space-store/src/impls/cloud/blob.ts
new file mode 100644
index 0000000000000..3b5172ff23050
--- /dev/null
+++ b/packages/common/space-store/src/impls/cloud/blob.ts
@@ -0,0 +1,84 @@
+import {
+  deleteBlobMutation,
+  gqlFetcherFactory,
+  listBlobsQuery,
+  releaseDeletedBlobsMutation,
+  setBlobMutation,
+} from '@affine/graphql';
+
+import { DummyConnection } from '../../connection';
+import {
+  type BlobRecord,
+  BlobStorage,
+  type BlobStorageOptions,
+} from '../../storage';
+
+interface CloudBlobStorageOptions extends BlobStorageOptions {
+  endpoint: string;
+}
+
+export class CloudBlobStorage extends BlobStorage<CloudBlobStorageOptions> {
+  private readonly gql = gqlFetcherFactory(this.options.endpoint + '/graphql');
+  override connection = new DummyConnection();
+
+  override async get(key: string) {
+    const res = await fetch(
+      this.options.endpoint +
+        '/api/workspaces/' +
+        this.spaceId +
+        '/blobs/' +
+        key,
+      { cache: 'default' }
+    );
+
+    if (!res.ok) {
+      return null;
+    }
+
+    const data = await res.arrayBuffer();
+
+    return {
+      key,
+      data: new Uint8Array(data),
+      mime: res.headers.get('content-type') || '',
+      size: data.byteLength,
+      createdAt: new Date(res.headers.get('last-modified') || Date.now()),
+    };
+  }
+
+  override async set(blob: BlobRecord) {
+    await this.gql({
+      query: setBlobMutation,
+      variables: {
+        workspaceId: this.spaceId,
+        blob: new File([blob.data], blob.key, { type: blob.mime }),
+      },
+    });
+  }
+
+  override async delete(key: string, permanently: boolean) {
+    await this.gql({
+      query: deleteBlobMutation,
+      variables: { workspaceId: this.spaceId, key, permanently },
+    });
+  }
+
+  override async release() {
+    await this.gql({
+      query: releaseDeletedBlobsMutation,
+      variables: { workspaceId: this.spaceId },
+    });
+  }
+
+  override async list() {
+    const res = await this.gql({
+      query: listBlobsQuery,
+      variables: { workspaceId: this.spaceId },
+    });
+
+    return res.workspace.blobs.map(blob => ({
+      ...blob,
+      createdAt: new Date(blob.createdAt),
+    }));
+  }
+}
diff --git a/packages/common/space-store/src/impls/cloud/doc.ts b/packages/common/space-store/src/impls/cloud/doc.ts
new file mode 100644
index 0000000000000..7167832e36bdf
--- /dev/null
+++ b/packages/common/space-store/src/impls/cloud/doc.ts
@@ -0,0 +1,170 @@
+import type { SocketOptions } from 'socket.io-client';
+
+import { share } from '../../connection';
+import {
+  type DocClocks,
+  DocStorage,
+  type DocStorageOptions,
+  type DocUpdate,
+} from '../../storage';
+import {
+  base64ToUint8Array,
+  type ServerEventsMap,
+  SocketConnection,
+  uint8ArrayToBase64,
+} from './socket';
+
+interface CloudDocStorageOptions extends DocStorageOptions {
+  endpoint: string;
+  socketOptions: SocketOptions;
+}
+
+export class CloudDocStorage extends DocStorage<CloudDocStorageOptions> {
+  connection = share(
+    new SocketConnection(this.options.endpoint, this.options.socketOptions)
+  );
+
+  private get socket() {
+    return this.connection.inner;
+  }
+
+  get name() {
+    return this.options.endpoint;
+  }
+
+  override async connect(): Promise<void> {
+    await super.connect();
+    const res = await this.socket.emitWithAck('space:join', {
+      spaceType: this.spaceType,
+      spaceId: this.spaceId,
+      clientVersion: BUILD_CONFIG.appVersion,
+    });
+
+    if ('error' in res) {
+      throw new Error(res.error.message);
+    }
+
+    this.socket?.on('space:broadcast-doc-update', this.onServerUpdate);
+  }
+
+  override async disconnect(): Promise<void> {
+    this.socket.emit('space:leave', {
+      spaceType: this.spaceType,
+      spaceId: this.spaceId,
+    });
+    this.socket?.off('space:broadcast-doc-update', this.onServerUpdate);
+    await super.connect();
+  }
+
+  onServerUpdate: ServerEventsMap['space:broadcast-doc-update'] = message => {
+    if (
+      this.spaceType === message.spaceType &&
+      this.spaceId === message.spaceId
+    ) {
+      this.emit('update', {
+        docId: message.docId,
+        bin: base64ToUint8Array(message.update),
+        timestamp: new Date(message.timestamp),
+        editor: message.editor,
+      });
+    }
+  };
+
+  override async getDocSnapshot(docId: string) {
+    const response = await this.socket.emitWithAck('space:load-doc', {
+      spaceType: this.spaceType,
+      spaceId: this.spaceId,
+      docId,
+    });
+
+    if ('error' in response) {
+      // TODO: use [UserFriendlyError]
+      throw new Error(response.error.message);
+    }
+
+    return {
+      docId,
+      bin: base64ToUint8Array(response.data.missing),
+      timestamp: new Date(response.data.timestamp),
+    };
+  }
+
+  override async getDocDiff(docId: string, state?: Uint8Array) {
+    const response = await this.socket.emitWithAck('space:load-doc', {
+      spaceType: this.spaceType,
+      spaceId: this.spaceId,
+      docId,
+      stateVector: state ? await uint8ArrayToBase64(state) : void 0,
+    });
+
+    if ('error' in response) {
+      // TODO: use [UserFriendlyError]
+      throw new Error(response.error.message);
+    }
+
+    return {
+      docId,
+      missing: base64ToUint8Array(response.data.missing),
+      state: base64ToUint8Array(response.data.state),
+      timestamp: new Date(response.data.timestamp),
+    };
+  }
+
+  override async pushDocUpdate(update: DocUpdate) {
+    const response = await this.socket.emitWithAck('space:push-doc-update', {
+      spaceType: this.spaceType,
+      spaceId: this.spaceId,
+      docId: update.docId,
+      updates: await uint8ArrayToBase64(update.bin),
+    });
+
+    if ('error' in response) {
+      // TODO(@forehalo): use [UserFriendlyError]
+      throw new Error(response.error.message);
+    }
+
+    return {
+      docId: update.docId,
+      timestamp: new Date(response.data.timestamp),
+    };
+  }
+
+  override async getDocTimestamps(after?: Date) {
+    const response = await this.socket.emitWithAck(
+      'space:load-doc-timestamps',
+      {
+        spaceType: this.spaceType,
+        spaceId: this.spaceId,
+        timestamp: after ? after.getTime() : undefined,
+      }
+    );
+
+    if ('error' in response) {
+      // TODO(@forehalo): use [UserFriendlyError]
+      throw new Error(response.error.message);
+    }
+
+    return Object.entries(response.data).reduce((ret, [docId, timestamp]) => {
+      ret[docId] = new Date(timestamp);
+      return ret;
+    }, {} as DocClocks);
+  }
+
+  override async deleteDoc(docId: string) {
+    this.socket.emit('space:delete-doc', {
+      spaceType: this.spaceType,
+      spaceId: this.spaceId,
+      docId,
+    });
+  }
+
+  protected async setDocSnapshot() {
+    return false;
+  }
+  protected async getDocUpdates() {
+    return [];
+  }
+  protected async markUpdatesMerged() {
+    return 0;
+  }
+}
diff --git a/packages/common/space-store/src/impls/cloud/index.ts b/packages/common/space-store/src/impls/cloud/index.ts
new file mode 100644
index 0000000000000..d476ae6eb9b92
--- /dev/null
+++ b/packages/common/space-store/src/impls/cloud/index.ts
@@ -0,0 +1,2 @@
+export * from './blob';
+export * from './doc';
diff --git a/packages/common/space-store/src/impls/cloud/socket.ts b/packages/common/space-store/src/impls/cloud/socket.ts
new file mode 100644
index 0000000000000..06cd796fa4eed
--- /dev/null
+++ b/packages/common/space-store/src/impls/cloud/socket.ts
@@ -0,0 +1,164 @@
+import {
+  Manager as SocketIOManager,
+  type Socket as SocketIO,
+  type SocketOptions,
+} from 'socket.io-client';
+
+import { Connection } from '../../connection';
+
+// TODO(@forehalo): use [UserFriendlyError]
+interface EventError {
+  name: string;
+  message: string;
+}
+
+type WebsocketResponse<T> =
+  | {
+      error: EventError;
+    }
+  | {
+      data: T;
+    };
+
+interface ServerEvents {
+  'space:broadcast-doc-update': {
+    spaceType: string;
+    spaceId: string;
+    docId: string;
+    update: string;
+    timestamp: number;
+    editor: string;
+  };
+}
+
+interface ClientEvents {
+  'space:join': [
+    { spaceType: string; spaceId: string; clientVersion: string },
+    { clientId: string },
+  ];
+  'space:leave': { spaceType: string; spaceId: string };
+  'space:join-awareness': [
+    {
+      spaceType: string;
+      spaceId: string;
+      docId: string;
+      clientVersion: string;
+    },
+    { clientId: string },
+  ];
+  'space:leave-awareness': {
+    spaceType: string;
+    spaceId: string;
+    docId: string;
+  };
+
+  'space:push-doc-update': [
+    { spaceType: string; spaceId: string; docId: string; updates: string },
+    { timestamp: number },
+  ];
+  'space:load-doc-timestamps': [
+    {
+      spaceType: string;
+      spaceId: string;
+      timestamp?: number;
+    },
+    Record<string, number>,
+  ];
+  'space:load-doc': [
+    {
+      spaceType: string;
+      spaceId: string;
+      docId: string;
+      stateVector?: string;
+    },
+    {
+      missing: string;
+      state: string;
+      timestamp: number;
+    },
+  ];
+  'space:delete-doc': { spaceType: string; spaceId: string; docId: string };
+}
+
+export type ServerEventsMap = {
+  [Key in keyof ServerEvents]: (data: ServerEvents[Key]) => void;
+};
+
+export type ClientEventsMap = {
+  [Key in keyof ClientEvents]: ClientEvents[Key] extends Array<any>
+    ? (
+        data: ClientEvents[Key][0],
+        ack: (res: WebsocketResponse<ClientEvents[Key][1]>) => void
+      ) => void
+    : (data: ClientEvents[Key]) => void;
+};
+
+export type Socket = SocketIO<ServerEventsMap, ClientEventsMap>;
+
+export function uint8ArrayToBase64(array: Uint8Array): Promise<string> {
+  return new Promise<string>(resolve => {
+    // Create a blob from the Uint8Array
+    const blob = new Blob([array]);
+
+    const reader = new FileReader();
+    reader.onload = function () {
+      const dataUrl = reader.result as string | null;
+      if (!dataUrl) {
+        resolve('');
+        return;
+      }
+      // The result includes the `data:` URL prefix and the MIME type. We only want the Base64 data
+      const base64 = dataUrl.split(',')[1];
+      resolve(base64);
+    };
+
+    reader.readAsDataURL(blob);
+  });
+}
+
+export function base64ToUint8Array(base64: string) {
+  const binaryString = atob(base64);
+  const binaryArray = binaryString.split('').map(function (char) {
+    return char.charCodeAt(0);
+  });
+  return new Uint8Array(binaryArray);
+}
+
+export class SocketConnection extends Connection<Socket> {
+  manager = new SocketIOManager(this.endpoint, {
+    autoConnect: false,
+    transports: ['websocket'],
+    secure: new URL(this.endpoint).protocol === 'https:',
+  });
+
+  constructor(
+    private readonly endpoint: string,
+    private readonly socketOptions: SocketOptions
+  ) {
+    super();
+  }
+
+  override get shareId() {
+    return `socket:${this.endpoint}`;
+  }
+
+  override async doConnect() {
+    const conn = this.manager.socket('/', this.socketOptions);
+
+    await new Promise<void>((resolve, reject) => {
+      conn.once('connect', () => {
+        resolve();
+      });
+      conn.once('connect_error', err => {
+        reject(err);
+      });
+      conn.open();
+    });
+
+    return conn;
+  }
+
+  override async doDisconnect(conn: Socket) {
+    conn.close();
+  }
+}
diff --git a/packages/common/space-store/src/impls/index.ts b/packages/common/space-store/src/impls/index.ts
index 8bce204798b51..bff2874ad4467 100644
--- a/packages/common/space-store/src/impls/index.ts
+++ b/packages/common/space-store/src/impls/index.ts
@@ -1,4 +1,5 @@
 import type { Storage } from '../storage';
+import { CloudBlobStorage, CloudDocStorage } from './cloud';
 import {
   IndexedDBBlobStorage,
   IndexedDBDocStorage,
@@ -19,7 +20,9 @@ const idbv1: StorageConstructor[] = [
   IndexedDBV1BlobStorage,
 ];
 
-export const storages: StorageConstructor[] = [...idbv1, ...idb];
+const cloud: StorageConstructor[] = [CloudDocStorage, CloudBlobStorage];
+
+export const storages: StorageConstructor[] = cloud.concat(idbv1, idb);
 
 const AvailableStorageImplementations = storages.reduce(
   (acc, curr) => {
diff --git a/packages/frontend/core/src/modules/cloud/stores/user-quota.ts b/packages/frontend/core/src/modules/cloud/stores/user-quota.ts
index 0413d46dcb8b5..70698060aec26 100644
--- a/packages/frontend/core/src/modules/cloud/stores/user-quota.ts
+++ b/packages/frontend/core/src/modules/cloud/stores/user-quota.ts
@@ -23,7 +23,7 @@ export class UserQuotaStore extends Store {
     return {
       userId: data.currentUser.id,
       quota: data.currentUser.quota,
-      used: data.collectAllBlobSizes.size,
+      used: data.currentUser.quotaUsage.storageQuota,
     };
   }
 }
diff --git a/packages/frontend/core/src/modules/workspace-engine/impls/engine/blob-cloud.ts b/packages/frontend/core/src/modules/workspace-engine/impls/engine/blob-cloud.ts
index 3eacf5dbfb691..e6549b0e05e8f 100644
--- a/packages/frontend/core/src/modules/workspace-engine/impls/engine/blob-cloud.ts
+++ b/packages/frontend/core/src/modules/workspace-engine/impls/engine/blob-cloud.ts
@@ -70,7 +70,7 @@ export class CloudBlobStorage implements BlobStorage {
       query: deleteBlobMutation,
       variables: {
         workspaceId: key,
-        hash: key,
+        key,
       },
     });
   }
@@ -82,6 +82,6 @@ export class CloudBlobStorage implements BlobStorage {
         workspaceId: this.workspaceId,
       },
     });
-    return result.listBlobs;
+    return result.workspace.blobs.map(blob => blob.key);
   }
 }
diff --git a/packages/frontend/graphql/src/graphql/blob-delete.gql b/packages/frontend/graphql/src/graphql/blob-delete.gql
index 790c326465909..ab78a54d88c6a 100644
--- a/packages/frontend/graphql/src/graphql/blob-delete.gql
+++ b/packages/frontend/graphql/src/graphql/blob-delete.gql
@@ -1,3 +1,7 @@
-mutation deleteBlob($workspaceId: String!, $hash: String!) {
-  deleteBlob(workspaceId: $workspaceId, hash: $hash)
+mutation deleteBlob(
+  $workspaceId: String!
+  $key: String!
+  $permanently: Boolean
+) {
+  deleteBlob(workspaceId: $workspaceId, key: $key, permanently: $permanently)
 }
diff --git a/packages/frontend/graphql/src/graphql/blob-list.gql b/packages/frontend/graphql/src/graphql/blob-list.gql
index 67a19c718c1bb..5b314f0cc5cfa 100644
--- a/packages/frontend/graphql/src/graphql/blob-list.gql
+++ b/packages/frontend/graphql/src/graphql/blob-list.gql
@@ -1,3 +1,10 @@
 query listBlobs($workspaceId: String!) {
-  listBlobs(workspaceId: $workspaceId)
+  workspace(id: $workspaceId) {
+    blobs {
+      key
+      size
+      mime
+      createdAt
+    }
+  }
 }
diff --git a/packages/frontend/graphql/src/graphql/blob-release-deleted.gql b/packages/frontend/graphql/src/graphql/blob-release-deleted.gql
new file mode 100644
index 0000000000000..d51d0ef7ca68d
--- /dev/null
+++ b/packages/frontend/graphql/src/graphql/blob-release-deleted.gql
@@ -0,0 +1,3 @@
+mutation releaseDeletedBlobs($workspaceId: String!) {
+  releaseDeletedBlobs(workspaceId: $workspaceId)
+}
diff --git a/packages/frontend/graphql/src/graphql/index.ts b/packages/frontend/graphql/src/graphql/index.ts
index 2bc168d6cf542..e94ec76fdf98e 100644
--- a/packages/frontend/graphql/src/graphql/index.ts
+++ b/packages/frontend/graphql/src/graphql/index.ts
@@ -47,19 +47,37 @@ export const deleteBlobMutation = {
   definitionName: 'deleteBlob',
   containsFile: false,
   query: `
-mutation deleteBlob($workspaceId: String!, $hash: String!) {
-  deleteBlob(workspaceId: $workspaceId, hash: $hash)
+mutation deleteBlob($workspaceId: String!, $key: String!, $permanently: Boolean) {
+  deleteBlob(workspaceId: $workspaceId, key: $key, permanently: $permanently)
 }`,
 };
 
 export const listBlobsQuery = {
   id: 'listBlobsQuery' as const,
   operationName: 'listBlobs',
-  definitionName: 'listBlobs',
+  definitionName: 'workspace',
   containsFile: false,
   query: `
 query listBlobs($workspaceId: String!) {
-  listBlobs(workspaceId: $workspaceId)
+  workspace(id: $workspaceId) {
+    blobs {
+      key
+      size
+      mime
+      createdAt
+    }
+  }
+}`,
+};
+
+export const releaseDeletedBlobsMutation = {
+  id: 'releaseDeletedBlobsMutation' as const,
+  operationName: 'releaseDeletedBlobs',
+  definitionName: 'releaseDeletedBlobs',
+  containsFile: false,
+  query: `
+mutation releaseDeletedBlobs($workspaceId: String!) {
+  releaseDeletedBlobs(workspaceId: $workspaceId)
 }`,
 };
 
@@ -836,7 +854,7 @@ mutation publishPage($workspaceId: String!, $pageId: String!, $mode: PublicPageM
 export const quotaQuery = {
   id: 'quotaQuery' as const,
   operationName: 'quota',
-  definitionName: 'currentUser,collectAllBlobSizes',
+  definitionName: 'currentUser',
   containsFile: false,
   query: `
 query quota {
@@ -856,9 +874,9 @@ query quota {
         memberLimit
       }
     }
-  }
-  collectAllBlobSizes {
-    size
+    quotaUsage {
+      storageQuota
+    }
   }
 }`,
 };
diff --git a/packages/frontend/graphql/src/graphql/quota.gql b/packages/frontend/graphql/src/graphql/quota.gql
index c0268b6443584..682c2e5bc3550 100644
--- a/packages/frontend/graphql/src/graphql/quota.gql
+++ b/packages/frontend/graphql/src/graphql/quota.gql
@@ -15,8 +15,8 @@ query quota {
         memberLimit
       }
     }
-  }
-  collectAllBlobSizes {
-    size
+    quotaUsage {
+      storageQuota
+    }
   }
 }
diff --git a/packages/frontend/graphql/src/schema.ts b/packages/frontend/graphql/src/schema.ts
index 039a08c63f1b8..3f0a42a862b3c 100644
--- a/packages/frontend/graphql/src/schema.ts
+++ b/packages/frontend/graphql/src/schema.ts
@@ -471,6 +471,14 @@ export interface ListUserInput {
   skip: InputMaybe<Scalars['Int']['input']>;
 }
 
+export interface ListedBlob {
+  __typename?: 'ListedBlob';
+  createdAt: Scalars['String']['output'];
+  key: Scalars['String']['output'];
+  mime: Scalars['String']['output'];
+  size: Scalars['Int']['output'];
+}
+
 export interface ManageUserInput {
   /** User email */
   email: InputMaybe<Scalars['String']['input']>;
@@ -519,6 +527,7 @@ export interface Mutation {
   leaveWorkspace: Scalars['Boolean']['output'];
   publishPage: WorkspacePage;
   recoverDoc: Scalars['DateTime']['output'];
+  releaseDeletedBlobs: Scalars['Boolean']['output'];
   /** Remove user avatar */
   removeAvatar: RemoveAvatar;
   removeWorkspaceFeature: Scalars['Int']['output'];
@@ -616,7 +625,9 @@ export interface MutationCreateWorkspaceArgs {
 }
 
 export interface MutationDeleteBlobArgs {
-  hash: Scalars['String']['input'];
+  hash: InputMaybe<Scalars['String']['input']>;
+  key: InputMaybe<Scalars['String']['input']>;
+  permanently?: Scalars['Boolean']['input'];
   workspaceId: Scalars['String']['input'];
 }
 
@@ -657,6 +668,10 @@ export interface MutationRecoverDocArgs {
   workspaceId: Scalars['String']['input'];
 }
 
+export interface MutationReleaseDeletedBlobsArgs {
+  workspaceId: Scalars['String']['input'];
+}
+
 export interface MutationRemoveWorkspaceFeatureArgs {
   feature: FeatureType;
   workspaceId: Scalars['String']['input'];
@@ -802,9 +817,7 @@ export enum PublicPageMode {
 
 export interface Query {
   __typename?: 'Query';
-  /** @deprecated no more needed */
-  checkBlobSize: WorkspaceBlobSizes;
-  /** @deprecated use `user.storageUsage` instead */
+  /** @deprecated use `user.quotaUsage` instead */
   collectAllBlobSizes: WorkspaceBlobSizes;
   /** Get current user */
   currentUser: Maybe<UserType>;
@@ -843,11 +856,6 @@ export interface Query {
   workspaces: Array<WorkspaceType>;
 }
 
-export interface QueryCheckBlobSizeArgs {
-  size: Scalars['SafeInt']['input'];
-  workspaceId: Scalars['String']['input'];
-}
-
 export interface QueryErrorArgs {
   name: ErrorNames;
 }
@@ -1125,6 +1133,11 @@ export interface UserQuotaHumanReadable {
   storageQuota: Scalars['String']['output'];
 }
 
+export interface UserQuotaUsage {
+  __typename?: 'UserQuotaUsage';
+  storageQuota: Scalars['SafeInt']['output'];
+}
+
 export interface UserSubscription {
   __typename?: 'UserSubscription';
   canceledAt: Maybe<Scalars['DateTime']['output']>;
@@ -1171,6 +1184,7 @@ export interface UserType {
   /** User name */
   name: Scalars['String']['output'];
   quota: Maybe<UserQuota>;
+  quotaUsage: UserQuotaUsage;
   /** @deprecated use `UserType.subscriptions` */
   subscription: Maybe<UserSubscription>;
   subscriptions: Array<UserSubscription>;
@@ -1223,7 +1237,7 @@ export interface WorkspaceType {
   /** Available features of workspace */
   availableFeatures: Array<FeatureType>;
   /** List blobs of workspace */
-  blobs: Array<Scalars['String']['output']>;
+  blobs: Array<ListedBlob>;
   /** Blobs size of workspace */
   blobsSize: Scalars['Int']['output'];
   /** Workspace created date */
@@ -1313,7 +1327,8 @@ export type AdminServerConfigQuery = {
 
 export type DeleteBlobMutationVariables = Exact<{
   workspaceId: Scalars['String']['input'];
-  hash: Scalars['String']['input'];
+  key: Scalars['String']['input'];
+  permanently: InputMaybe<Scalars['Boolean']['input']>;
 }>;
 
 export type DeleteBlobMutation = {
@@ -1325,7 +1340,28 @@ export type ListBlobsQueryVariables = Exact<{
   workspaceId: Scalars['String']['input'];
 }>;
 
-export type ListBlobsQuery = { __typename?: 'Query'; listBlobs: Array<string> };
+export type ListBlobsQuery = {
+  __typename?: 'Query';
+  workspace: {
+    __typename?: 'WorkspaceType';
+    blobs: Array<{
+      __typename?: 'ListedBlob';
+      key: string;
+      size: number;
+      mime: string;
+      createdAt: string;
+    }>;
+  };
+};
+
+export type ReleaseDeletedBlobsMutationVariables = Exact<{
+  workspaceId: Scalars['String']['input'];
+}>;
+
+export type ReleaseDeletedBlobsMutation = {
+  __typename?: 'Mutation';
+  releaseDeletedBlobs: boolean;
+};
 
 export type SetBlobMutationVariables = Exact<{
   workspaceId: Scalars['String']['input'];
@@ -2053,8 +2089,8 @@ export type QuotaQuery = {
         memberLimit: string;
       };
     } | null;
+    quotaUsage: { __typename?: 'UserQuotaUsage'; storageQuota: number };
   } | null;
-  collectAllBlobSizes: { __typename?: 'WorkspaceBlobSizes'; size: number };
 };
 
 export type RecoverDocMutationVariables = Exact<{
@@ -2680,6 +2716,11 @@ export type Mutations =
       variables: DeleteBlobMutationVariables;
       response: DeleteBlobMutation;
     }
+  | {
+      name: 'releaseDeletedBlobsMutation';
+      variables: ReleaseDeletedBlobsMutationVariables;
+      response: ReleaseDeletedBlobsMutation;
+    }
   | {
       name: 'setBlobMutation';
       variables: SetBlobMutationVariables;
diff --git a/yarn.lock b/yarn.lock
index 0c844aecd6cf2..7e305e9296bb0 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -850,14 +850,18 @@ __metadata:
   version: 0.0.0-use.local
   resolution: "@affine/space-store@workspace:packages/common/space-store"
   dependencies:
+    "@affine/graphql": "workspace:*"
     "@toeverything/infra": "workspace:*"
     eventemitter2: "npm:^6.4.9"
     idb: "npm:^8.0.0"
     lodash-es: "npm:^4.17.21"
     rxjs: "npm:^7.8.1"
+    socket.io-client: "npm:^4.7.5"
     yjs: "patch:yjs@npm%3A13.6.18#~/.yarn/patches/yjs-npm-13.6.18-ad0d5f7c43.patch"
   peerDependencies:
+    "@affine/graphql": "workspace:*"
     idb: ^8.0.0
+    socket.io-client: ^4.7.5
   languageName: unknown
   linkType: soft