diff --git a/apps/api/package.json b/apps/api/package.json
index 3517f70..7a67db5 100644
--- a/apps/api/package.json
+++ b/apps/api/package.json
@@ -9,13 +9,16 @@
     "typecheck": "tsc --noEmit -p tsconfig.json"
   },
   "dependencies": {
+    "@dada/asset-release-manifest": "workspace:*",
     "@dada/shared-contracts": "workspace:*",
+    "@dada/static-sticker-catalog": "workspace:*",
     "@fastify/multipart": "10.1.0",
     "@fastify/swagger": "9.8.1",
     "@sinclair/typebox": "0.34.52",
     "better-sqlite3": "13.0.1",
     "drizzle-orm": "0.45.2",
-    "fastify": "5.10.0"
+    "fastify": "5.10.0",
+    "sharp": "0.35.3"
   },
   "devDependencies": {
     "@types/better-sqlite3": "7.6.13",
diff --git a/apps/api/src/app.ts b/apps/api/src/app.ts
index 6329002..a3f9546 100644
--- a/apps/api/src/app.ts
+++ b/apps/api/src/app.ts
@@ -134,6 +134,7 @@ import {
   type RegistrationCompleteRequest,
   type RegistrationSendRequest,
 } from "@dada/shared-contracts";
+import type { AssetReleaseReader } from "@dada/asset-release-manifest";
 import swagger from "@fastify/swagger";
 import multipart from "@fastify/multipart";
 import Fastify, { type FastifyReply } from "fastify";
@@ -177,6 +178,9 @@ import type { RecentAssetService } from "./recent-assets.js";
 import type { AmapAdapter } from "./amap-adapter.js";
 import { ModelConfigurationError } from "./model-configuration.js";
 import type { ModelConfigurationService } from "./model-configuration.js";
+import { StickerReleaseError } from "./sticker-release-errors.js";
+import type { StickerReleaseService } from "./sticker-releases.js";
+import type { ManagedStorage } from "./managed-storage.js";
 
 const defaultBootstrap: BootstrapResponse = {
   app_version: "0.0.0",
@@ -192,6 +196,7 @@ const defaultBootstrap: BootstrapResponse = {
 
 export interface CreateAppOptions {
   amap?: AmapAdapter;
+  assetReleases?: AssetReleaseReader;
   bootstrap?: () => BootstrapResponse | Promise<BootstrapResponse>;
   browserGate?: boolean;
   browserSupportRelease?: BrowserSupportRelease;
@@ -205,7 +210,20 @@ export interface CreateAppOptions {
   publicAssets?: PublicAssetResolver;
   recentAssets?: RecentAssetService;
   projects?: ProjectService;
+  storage?: ManagedStorage;
+  previewAssetAuthorizer?: (input: {
+    releaseVersion: string;
+    resourceId: string;
+    userId: string;
+  }) => boolean | Promise<boolean>;
+  privateAssetAdminAuthorizer?: (input: {
+    adminUserId: string;
+    ownerId: string;
+    releaseVersion: string;
+    resourceId: string;
+  }) => boolean | Promise<boolean>;
   registration?: RegistrationService;
+  stickers?: StickerReleaseService;
 }
 
 const supportGateDirectory = resolve(process.env.DADA_SUPPORT_GATE_ROOT ?? "apps/web/support-gate");
@@ -361,6 +379,24 @@ function modelConfigurationFailure(reply: FastifyReply, correlationId: string, e
   return reply.code(status).send(createErrorEnvelope({ code: error.code, correlationId, details }));
 }
 
+function stickerReleaseFailure(reply: FastifyReply, correlationId: string, error: unknown) {
+  if (error instanceof StickerReleaseError) return reply.code(error.httpStatus).send(null);
+  return latestExportFailure(reply, correlationId, error);
+}
+
+function assetCleanupFailure(reply: FastifyReply, correlationId: string, error: unknown) {
+  const code = error instanceof Error ? error.message : "";
+  if (code === "ASSET_HISTORY_REFERENCE_CONFLICT" || code === "ASSET_CLEANUP_CANDIDATE_STALE") {
+    return reply.code(409).send(createErrorEnvelope({ code, correlationId }));
+  }
+  if (code === "IDEMPOTENCY_KEY_CONFLICT") {
+    return reply.code(409).send(createErrorEnvelope({ code: "IDEMPOTENCY_KEY_CONFLICT", correlationId }));
+  }
+  if (code === "cleanup_candidates_invalid") return reply.code(400).send(null);
+  if (code === "cleanup_uncommitted") return reply.code(503).send(createErrorEnvelope({ code: "AUTH_SERVICE_UNAVAILABLE", correlationId }));
+  return reply.code(503).send(createErrorEnvelope({ code: "AUTH_SERVICE_UNAVAILABLE", correlationId }));
+}
+
 function generationTaskResponse(task: GenerationTaskView) {
   return {
     confirmed_credit_cost: task.confirmedCreditCost,
@@ -816,13 +852,232 @@ export async function createApp(options: CreateAppOptions = {}) {
     status: "ready",
   }));
 
+  app.get(
+    "/api/v1/static-stickers/current",
+    { schema: { hide: true } },
+    async (_request, reply) => {
+      if (!options.stickers) return reply.code(503).send();
+      reply.header("Cache-Control", "no-cache");
+      return options.stickers.listPublic();
+    },
+  );
+
+  app.get(
+    "/api/v1/static-stickers/:resourceVersion",
+    { schema: { hide: true } },
+    async (request, reply) => {
+      if (!options.stickers) return reply.code(404).send();
+      const { resourceVersion } = request.params as { resourceVersion: string };
+      const catalog = options.stickers.listPublic(resourceVersion);
+      if (!catalog.release_version) return reply.code(404).send();
+      reply.header("Cache-Control", "public, max-age=31536000, immutable");
+      return catalog;
+    },
+  );
+
+  app.get(
+    "/api/v1/admin/assets/static-stickers",
+    { schema: { hide: true } },
+    async (request, reply) => {
+      if (!options.registration || !options.stickers) {
+        return reply.code(503).send(createErrorEnvelope({ code: "AUTH_SERVICE_UNAVAILABLE", correlationId: request.id }));
+      }
+      const token = cookieValue(headerValue(request.headers.cookie), adminSessionCookieName);
+      const session = token ? options.registration.readAdminSession(token) : undefined;
+      if (!session) return reply.code(401).send(createErrorEnvelope({ code: "AUTH_SESSION_INVALID", correlationId: request.id }));
+      reply.header("Cache-Control", "private, no-store");
+      return options.stickers.adminView();
+    },
+  );
+
+  app.post(
+    "/api/v1/admin/assets/static-stickers",
+    { schema: { hide: true } },
+    async (request, reply) => {
+      if (!request.isMultipart()) return reply.code(400).send(null);
+      if (!options.registration || !options.stickers) {
+        return reply.code(503).send(createErrorEnvelope({ code: "AUTH_SERVICE_UNAVAILABLE", correlationId: request.id }));
+      }
+      const token = cookieValue(headerValue(request.headers.cookie), adminSessionCookieName);
+      const idempotencyKey = headerValue(request.headers["idempotency-key"]);
+      const csrfToken = headerValue(request.headers["x-csrf-token"]);
+      if (!token) return reply.code(401).send(createErrorEnvelope({ code: "AUTH_SESSION_INVALID", correlationId: request.id }));
+      if (!idempotencyKey || !/^[A-Za-z0-9_-]{32,200}$/.test(idempotencyKey)
+        || !csrfToken || !/^[A-Za-z0-9_-]{43,64}$/.test(csrfToken)) return reply.code(400).send(null);
+      try {
+        const admin = options.registration.authorizeAdminMutation({ csrfToken, sessionToken: token });
+        const values = new Map<string, string>();
+        const allowedFields = new Set(["enabled", "order", "original_byte_size", "original_sha256", "part", "stable_id"]);
+        let result: Awaited<ReturnType<StickerReleaseService["upload"]>> | undefined;
+        for await (const part of request.parts({ limits: { fileSize: 20 * 1024 * 1024, files: 1, fields: 8, parts: 9 } })) {
+          if (part.type === "field") {
+            if (result || !allowedFields.has(part.fieldname) || values.has(part.fieldname) || typeof part.value !== "string") throw new StickerReleaseError("sticker_upload_invalid");
+            values.set(part.fieldname, part.value);
+            continue;
+          }
+          if (result || part.fieldname !== "sticker_file" || !part.filename
+            || !new Set(["image/png", "image/webp"]).has(part.mimetype)) throw new StickerReleaseError("sticker_upload_invalid");
+          const stableId = values.get("stable_id");
+          const partValue = Number(values.get("part"));
+          const order = Number(values.get("order"));
+          const enabled = values.get("enabled");
+          const expectedByteSize = Number(values.get("original_byte_size"));
+          const expectedSha256 = values.get("original_sha256");
+          if (!stableId || !expectedSha256 || !new Set(["true", "false"]).has(enabled ?? "")) throw new StickerReleaseError("sticker_upload_invalid");
+          result = await options.stickers.upload({
+            actorId: admin.userId,
+            content: part.file,
+            enabled: enabled === "true",
+            expectedByteSize,
+            expectedMimeType: part.mimetype as "image/png" | "image/webp",
+            expectedSha256,
+            fileName: part.filename,
+            idempotencyKey,
+            order,
+            part: partValue,
+            stableId,
+          });
+          if (part.file.truncated) throw new StickerReleaseError("sticker_upload_invalid");
+        }
+        if (!result) throw new StickerReleaseError("sticker_upload_invalid");
+        return reply.code(result.created ? 201 : 200).send(result);
+      } catch (error) {
+        return error instanceof RegistrationError
+          ? registrationFailure(reply, request.id, error)
+          : stickerReleaseFailure(reply, request.id, error);
+      }
+    },
+  );
+
+  app.patch(
+    "/api/v1/admin/assets/static-stickers/:stableId",
+    { schema: { hide: true } },
+    async (request, reply) => {
+      if (!options.registration || !options.stickers) {
+        return reply.code(503).send(createErrorEnvelope({ code: "AUTH_SERVICE_UNAVAILABLE", correlationId: request.id }));
+      }
+      const token = cookieValue(headerValue(request.headers.cookie), adminSessionCookieName);
+      const csrfToken = headerValue(request.headers["x-csrf-token"]);
+      if (!token || !csrfToken) return reply.code(401).send(createErrorEnvelope({ code: "AUTH_SESSION_INVALID", correlationId: request.id }));
+      try {
+        const admin = options.registration.authorizeAdminMutation({ csrfToken, sessionToken: token });
+        const body = request.body as { enabled?: boolean; order?: number; part?: number } | undefined;
+        if (!body || Object.keys(body).length === 0 || Object.keys(body).some((key) => !new Set(["enabled", "order", "part"]).has(key))) {
+          throw new StickerReleaseError("sticker_update_invalid");
+        }
+        return options.stickers.update({
+          actorId: admin.userId,
+          ...(typeof body.enabled === "boolean" ? { enabled: body.enabled } : {}),
+          ...(typeof body.order === "number" ? { order: body.order } : {}),
+          ...(typeof body.part === "number" ? { part: body.part } : {}),
+          stableId: (request.params as { stableId: string }).stableId,
+        });
+      } catch (error) {
+        return error instanceof RegistrationError
+          ? registrationFailure(reply, request.id, error)
+          : stickerReleaseFailure(reply, request.id, error);
+      }
+    },
+  );
+
+  app.get(
+    "/api/v1/admin/assets/static-stickers/cleanup/candidates",
+    { schema: { hide: true } },
+    async (request, reply) => {
+      if (!options.registration || !options.storage) {
+        return reply.code(503).send(createErrorEnvelope({ code: "AUTH_SERVICE_UNAVAILABLE", correlationId: request.id }));
+      }
+      const token = cookieValue(headerValue(request.headers.cookie), adminSessionCookieName);
+      const session = token ? options.registration.readAdminSession(token) : undefined;
+      if (!session) return reply.code(401).send(createErrorEnvelope({ code: "AUTH_SESSION_INVALID", correlationId: request.id }));
+      try {
+        reply.header("Cache-Control", "private, no-store");
+        return options.storage.listAssetCleanupCandidates();
+      } catch (error) {
+        return assetCleanupFailure(reply, request.id, error);
+      }
+    },
+  );
+
+  app.post(
+    "/api/v1/admin/assets/static-stickers/cleanup/intents",
+    { schema: { hide: true } },
+    async (request, reply) => {
+      if (!options.registration || !options.storage) {
+        return reply.code(503).send(createErrorEnvelope({ code: "AUTH_SERVICE_UNAVAILABLE", correlationId: request.id }));
+      }
+      const token = cookieValue(headerValue(request.headers.cookie), adminSessionCookieName);
+      const csrfToken = headerValue(request.headers["x-csrf-token"]);
+      const idempotencyKey = headerValue(request.headers["idempotency-key"]);
+      if (!token || !csrfToken) return reply.code(401).send(createErrorEnvelope({ code: "AUTH_SESSION_INVALID", correlationId: request.id }));
+      if (!idempotencyKey || !/^[A-Za-z0-9_-]{32,200}$/.test(idempotencyKey) || !/^[A-Za-z0-9_-]{43,64}$/.test(csrfToken)) return reply.code(400).send(null);
+      try {
+        const admin = options.registration.authorizeAdminMutation({ csrfToken, sessionToken: token });
+        const body = request.body as { file_ids?: string[]; snapshot_version?: string } | undefined;
+        return reply.code(201).send(options.storage.createAssetCleanupIntent({
+          actorId: admin.userId,
+          fileIds: body?.file_ids ?? [],
+          idempotencyKey,
+          snapshotVersion: body?.snapshot_version ?? "",
+        }));
+      } catch (error) {
+        return assetCleanupFailure(reply, request.id, error);
+      }
+    },
+  );
+
+  app.post(
+    "/api/v1/admin/assets/static-stickers/cleanup/intents/:requestId/confirm",
+    { schema: { hide: true } },
+    async (request, reply) => {
+      if (!options.registration || !options.storage) {
+        return reply.code(503).send(createErrorEnvelope({ code: "AUTH_SERVICE_UNAVAILABLE", correlationId: request.id }));
+      }
+      const token = cookieValue(headerValue(request.headers.cookie), adminSessionCookieName);
+      const csrfToken = headerValue(request.headers["x-csrf-token"]);
+      if (!token || !csrfToken) return reply.code(401).send(createErrorEnvelope({ code: "AUTH_SESSION_INVALID", correlationId: request.id }));
+      if (!/^[A-Za-z0-9_-]{43,64}$/.test(csrfToken)) return reply.code(400).send(null);
+      try {
+        const admin = options.registration.authorizeAdminMutation({ csrfToken, sessionToken: token });
+        const body = request.body as { confirmation_token?: string } | undefined;
+        const requestId = (request.params as { requestId: string }).requestId;
+        return reply.send(options.storage.confirmAssetCleanupIntent({
+          actorId: admin.userId,
+          confirmationToken: body?.confirmation_token ?? "",
+          requestId,
+        }));
+      } catch (error) {
+        return assetCleanupFailure(reply, request.id, error);
+      }
+    },
+  );
+
+  app.get(
+    "/api/v1/assets/public/:resourceVersion/manifest",
+    { schema: { hide: true } },
+    async (request, reply) => {
+      const { resourceVersion } = request.params as { resourceVersion: string };
+      const manifest = options.assetReleases?.project("public_release_asset", resourceVersion);
+      if (!manifest) return reply.code(404).send();
+      reply.header("Cache-Control", "public, max-age=31536000, immutable");
+      reply.header("ETag", `"sha256-${manifest.manifest_sha256}"`);
+      return manifest;
+    },
+  );
+
   app.get(
     "/api/v1/assets/public/:resourceVersion/:assetId",
     { schema: { hide: true } },
     async (request, reply) => {
       const { assetId, resourceVersion } = request.params as { assetId?: string; resourceVersion?: string };
       const resource = assetId && resourceVersion
-        ? options.publicAssets?.read(resourceVersion, assetId)
+        ? options.assetReleases?.read("public_release_asset", resourceVersion, assetId)
+          ?? options.publicAssets?.read(resourceVersion, assetId)
+          ?? options.stickers?.readPublicAsset(
+            resourceVersion,
+            assetId,
+            (request.query as { variant?: string }).variant === "thumbnail" ? "thumbnail" : "original",
+          )
         : undefined;
       if (!resource) return reply.code(404).send();
       reply.type(resource.mimeType);
@@ -833,6 +1088,111 @@ export async function createApp(options: CreateAppOptions = {}) {
     },
   );
 
+  app.get(
+    "/api/v1/assets/preview/:resourceVersion/manifest",
+    { schema: { hide: true } },
+    async (request, reply) => {
+      if (!options.registration) {
+        return reply.code(503).send(createErrorEnvelope({ code: "AUTH_SERVICE_UNAVAILABLE", correlationId: request.id }));
+      }
+      const token = cookieValue(headerValue(request.headers.cookie), userSessionCookieName);
+      const session = token ? options.registration.readUserSession(token) : undefined;
+      if (!session) return reply.code(401).send(createErrorEnvelope({ code: "AUTH_SESSION_INVALID", correlationId: request.id }));
+      const { resourceVersion } = request.params as { resourceVersion: string };
+      const available = options.assetReleases?.project("internal_preview_asset", resourceVersion);
+      if (!available || !options.previewAssetAuthorizer) return reply.code(404).send();
+      const authorizedIds: string[] = [];
+      for (const item of available.items) {
+        if (await options.previewAssetAuthorizer({
+          releaseVersion: resourceVersion,
+          resourceId: item.resource_id,
+          userId: session.userId,
+        })) authorizedIds.push(item.resource_id);
+      }
+      if (authorizedIds.length === 0) return reply.code(404).send();
+      const manifest = options.assetReleases?.project("internal_preview_asset", resourceVersion, { resourceIds: authorizedIds });
+      if (!manifest) return reply.code(404).send();
+      reply.header("Cache-Control", "private, no-store");
+      reply.header("Vary", "Cookie");
+      return manifest;
+    },
+  );
+
+  app.get(
+    "/api/v1/assets/preview/:resourceVersion/:assetId",
+    { schema: { hide: true } },
+    async (request, reply) => {
+      if (!options.registration) {
+        return reply.code(503).send(createErrorEnvelope({ code: "AUTH_SERVICE_UNAVAILABLE", correlationId: request.id }));
+      }
+      const token = cookieValue(headerValue(request.headers.cookie), userSessionCookieName);
+      const session = token ? options.registration.readUserSession(token) : undefined;
+      if (!session) return reply.code(401).send(createErrorEnvelope({ code: "AUTH_SESSION_INVALID", correlationId: request.id }));
+      const { assetId, resourceVersion } = request.params as { assetId: string; resourceVersion: string };
+      const authorized = await options.previewAssetAuthorizer?.({ resourceId: assetId, releaseVersion: resourceVersion, userId: session.userId });
+      const resource = authorized ? options.assetReleases?.read("internal_preview_asset", resourceVersion, assetId) : undefined;
+      if (!resource) return reply.code(404).send();
+      reply.type(resource.mimeType);
+      reply.header("Cache-Control", "private, no-store");
+      reply.header("Content-Disposition", "inline");
+      reply.header("Vary", "Cookie");
+      return resource.bytes;
+    },
+  );
+
+  app.get(
+    "/api/v1/private-assets/:resourceVersion/manifest",
+    { schema: { hide: true } },
+    async (request, reply) => {
+      if (!options.registration) {
+        return reply.code(503).send(createErrorEnvelope({ code: "AUTH_SERVICE_UNAVAILABLE", correlationId: request.id }));
+      }
+      const token = cookieValue(headerValue(request.headers.cookie), userSessionCookieName);
+      const session = token ? options.registration.readUserSession(token) : undefined;
+      if (!session) return reply.code(401).send(createErrorEnvelope({ code: "AUTH_SESSION_INVALID", correlationId: request.id }));
+      const { resourceVersion } = request.params as { resourceVersion: string };
+      const manifest = options.assetReleases?.project("private_user_asset", resourceVersion, { ownerId: session.userId });
+      if (!manifest) return reply.code(404).send();
+      reply.header("Cache-Control", "private, no-store");
+      reply.header("Vary", "Cookie");
+      return manifest;
+    },
+  );
+
+  app.get(
+    "/api/v1/private-assets/:resourceVersion/:assetId",
+    { schema: { hide: true } },
+    async (request, reply) => {
+      if (!options.registration) {
+        return reply.code(503).send(createErrorEnvelope({ code: "AUTH_SERVICE_UNAVAILABLE", correlationId: request.id }));
+      }
+      const userToken = cookieValue(headerValue(request.headers.cookie), userSessionCookieName);
+      const userSession = userToken ? options.registration.readUserSession(userToken) : undefined;
+      const adminToken = cookieValue(headerValue(request.headers.cookie), adminSessionCookieName);
+      const adminSession = adminToken ? options.registration.readAdminSession(adminToken) : undefined;
+      if (!userSession && !adminSession) {
+        return reply.code(401).send(createErrorEnvelope({ code: "AUTH_SESSION_INVALID", correlationId: request.id }));
+      }
+      const { assetId, resourceVersion } = request.params as { assetId: string; resourceVersion: string };
+      const resource = options.assetReleases?.read("private_user_asset", resourceVersion, assetId);
+      if (!resource?.ownerId) return reply.code(404).send();
+      const controlledAdmin = adminSession
+        ? await options.privateAssetAdminAuthorizer?.({
+          adminUserId: adminSession.user_id,
+          ownerId: resource.ownerId,
+          releaseVersion: resource.releaseVersion,
+          resourceId: resource.resourceId,
+        })
+        : false;
+      if (userSession?.userId !== resource.ownerId && !controlledAdmin) return reply.code(404).send();
+      reply.type(resource.mimeType);
+      reply.header("Cache-Control", "private, no-store");
+      reply.header("Content-Disposition", "inline");
+      reply.header("Vary", "Cookie");
+      return resource.bytes;
+    },
+  );
+
   app.get(
     "/api/v1/assets/recent",
     {
diff --git a/apps/api/src/main.ts b/apps/api/src/main.ts
index 1629249..ccbaea5 100644
--- a/apps/api/src/main.ts
+++ b/apps/api/src/main.ts
@@ -18,6 +18,7 @@ import { StructuredJsonlLogger } from "./structured-log.js";
 import { attachApiSupervisorControl, initializeApiCredentialClients, receiveApiCredentials } from "./supervisor-channel.js";
 import { ModelConfigurationService } from "./model-configuration.js";
 import { MockAmapAdapter } from "./amap-adapter.js";
+import { StickerReleaseService } from "./sticker-releases.js";
 
 const credentialChannelEnabled = process.argv.includes("--dada-credential-stdin");
 let registration: RegistrationService | undefined;
@@ -27,6 +28,7 @@ let storage: ManagedStorage | undefined;
 let latestExports: LatestExportService | undefined;
 let models: ModelConfigurationService | undefined;
 let recentAssets: RecentAssetService | undefined;
+let stickers: StickerReleaseService | undefined;
 const instanceConfigPath = process.env.DADA_INSTANCE_CONFIG_PATH ?? defaultInstanceConfigPath();
 if (credentialChannelEnabled) {
   const clients = initializeApiCredentialClients(await receiveApiCredentials());
@@ -48,11 +50,14 @@ if (credentialChannelEnabled) {
     projects = new ProjectService({ databasePath });
     credits = new CreditService({ databasePath });
     storage = new ManagedStorage({ dataRoot, databasePath });
+    stickers = new StickerReleaseService({ databasePath, storage });
     latestExports = new LatestExportService({ databasePath, storage });
     models = new ModelConfigurationService({ database: registration.database });
     recentAssets = new RecentAssetService({ database: registration.database });
     registration.applySecureConfig(readSecureConfigCandidate(instanceConfigPath));
   } catch (error) {
+    stickers?.close();
+    stickers = undefined;
     latestExports?.close();
     latestExports = undefined;
     storage?.close();
@@ -79,6 +84,8 @@ const app = await createApp({
   ...(projects ? { projects } : {}),
   ...(registration ? { registration } : {}),
   ...(recentAssets ? { recentAssets } : {}),
+  ...(stickers ? { stickers } : {}),
+  ...(storage ? { storage } : {}),
 });
 
 await app.listen({
@@ -97,6 +104,7 @@ if (controlPipeIndex >= 0) {
     projects?.close();
     registration?.close();
     storage?.close();
+    stickers?.close();
   });
   try {
     const dataRoot = readConfiguredLocalDataRoot(instanceConfigPath);
diff --git a/apps/api/src/managed-storage.ts b/apps/api/src/managed-storage.ts
index 4854ad4..923bfeb 100644
--- a/apps/api/src/managed-storage.ts
+++ b/apps/api/src/managed-storage.ts
@@ -75,6 +75,31 @@ interface CleanupQueueRow {
   relative_path: string;
 }
 
+export interface AssetCleanupCandidateView {
+  byte_size: number;
+  file_id: string;
+  file_kind: "original" | "thumbnail";
+  hash_prefix: string;
+  reference_count: 0;
+  resource_version: string;
+  stable_id: string;
+}
+
+export interface AssetCleanupCandidatesView {
+  candidate_snapshot_version: string;
+  expires_at: string;
+  items: AssetCleanupCandidateView[];
+}
+
+export interface AssetCleanupIntentView {
+  confirmation_token: string;
+  expires_at: string;
+  file_count: number;
+  request_id: string;
+  status: "pending_confirmation" | "denied" | "queued" | "completed";
+  total_bytes: number;
+}
+
 export class StorageCapacityError extends Error {
   readonly code = "STORAGE_CAPACITY_EXCEEDED";
   readonly httpStatus = 507;
@@ -104,6 +129,10 @@ function auditExpiry(occurredAt: number) {
   return occurredAt + auditRetentionMilliseconds;
 }
 
+function digest(value: string) {
+  return createHash("sha256").update(value, "utf8").digest("hex");
+}
+
 function validatePositiveBytes(value: number, name: string) {
   if (!Number.isSafeInteger(value) || value <= 0) throw new Error(`${name}_invalid`);
 }
@@ -255,6 +284,28 @@ export class ManagedStorage {
         FOREIGN KEY (request_id) REFERENCES asset_cleanup_requests(request_id),
         FOREIGN KEY (managed_file_id) REFERENCES managed_files(file_id)
       );
+      CREATE TABLE IF NOT EXISTS asset_cleanup_candidate_snapshots (
+        snapshot_version TEXT PRIMARY KEY,
+        items_json TEXT NOT NULL,
+        created_at INTEGER NOT NULL,
+        expires_at INTEGER NOT NULL
+      );
+      CREATE TABLE IF NOT EXISTS sticker_managed_file_history (
+        managed_file_id TEXT NOT NULL,
+        stable_id TEXT NOT NULL,
+        resource_version TEXT NOT NULL,
+        file_kind TEXT NOT NULL CHECK (file_kind IN ('original', 'thumbnail')),
+        created_at INTEGER NOT NULL,
+        PRIMARY KEY (managed_file_id, file_kind),
+        FOREIGN KEY (managed_file_id) REFERENCES managed_files(file_id)
+      );
+      CREATE TABLE IF NOT EXISTS project_sticker_asset_refs (
+        reference_id TEXT PRIMARY KEY,
+        project_id TEXT NOT NULL,
+        stable_id TEXT NOT NULL,
+        resource_version TEXT NOT NULL,
+        created_at INTEGER NOT NULL
+      );
       CREATE TABLE IF NOT EXISTS admin_operation_logs (
         log_id TEXT PRIMARY KEY,
         actor_type TEXT NOT NULL CHECK (actor_type IN ('system', 'super_admin')),
@@ -277,6 +328,49 @@ export class ManagedStorage {
     if (!managedFileColumns.some((column) => column.name === "owner_ref")) {
       this.database.exec("ALTER TABLE managed_files ADD COLUMN owner_ref TEXT");
     }
+    if (!managedFileColumns.some((column) => column.name === "cleanup_status")) {
+      this.database.exec("ALTER TABLE managed_files ADD COLUMN cleanup_status TEXT");
+    }
+    const cleanupRequestColumns = this.database.prepare("PRAGMA table_info(asset_cleanup_requests)").all() as Array<{ name: string }>;
+    const cleanupRequestAdditions: Array<[string, string]> = [
+      ["created_by", "TEXT"],
+      ["confirmed_by", "TEXT"],
+      ["snapshot_version", "TEXT"],
+      ["expires_at", "INTEGER"],
+      ["confirmation_token_digest", "TEXT"],
+      ["idempotency_key_digest", "TEXT"],
+      ["request_hash", "TEXT"],
+      ["file_count", "INTEGER"],
+      ["total_bytes", "INTEGER"],
+      ["denied_reason", "TEXT"],
+    ];
+    for (const [column, type] of cleanupRequestAdditions) {
+      if (!cleanupRequestColumns.some((item) => item.name === column)) {
+        this.database.exec(`ALTER TABLE asset_cleanup_requests ADD COLUMN ${column} ${type}`);
+      }
+    }
+    const cleanupItemColumns = this.database.prepare("PRAGMA table_info(asset_cleanup_request_items)").all() as Array<{ name: string }>;
+    const cleanupItemAdditions: Array<[string, string]> = [
+      ["stable_id", "TEXT"],
+      ["resource_version", "TEXT"],
+      ["file_kind", "TEXT"],
+      ["byte_size", "INTEGER"],
+      ["sha256_prefix", "TEXT"],
+    ];
+    for (const [column, type] of cleanupItemAdditions) {
+      if (!cleanupItemColumns.some((item) => item.name === column)) {
+        this.database.exec(`ALTER TABLE asset_cleanup_request_items ADD COLUMN ${column} ${type}`);
+      }
+    }
+    this.database.exec(`
+      CREATE UNIQUE INDEX IF NOT EXISTS asset_cleanup_requests_actor_idempotency
+      ON asset_cleanup_requests (created_by, idempotency_key_digest)
+      WHERE created_by IS NOT NULL AND idempotency_key_digest IS NOT NULL;
+      CREATE INDEX IF NOT EXISTS sticker_managed_file_history_lookup
+      ON sticker_managed_file_history (stable_id, resource_version, file_kind);
+      CREATE INDEX IF NOT EXISTS asset_cleanup_candidate_snapshots_expiry
+      ON asset_cleanup_candidate_snapshots (expires_at);
+    `);
     ensureAdminOperationAuditSchema(this.database, Date.now());
     const initial = classifyCapacity(0, 0);
     this.database.prepare(`
@@ -299,6 +393,106 @@ export class ManagedStorage {
     return withReservations;
   }
 
+  private readAssetCleanupCandidates(): AssetCleanupCandidateView[] {
+    const releaseReferenceClause = this.tableExists("sticker_release_items") ? `
+        AND NOT EXISTS (
+          SELECT 1 FROM sticker_release_items release_items
+          WHERE release_items.original_file_id = mf.file_id OR release_items.thumbnail_file_id = mf.file_id
+        )` : "";
+    return this.database.prepare(`
+      SELECT
+        mf.file_id,
+        mf.byte_size,
+        history.stable_id,
+        history.resource_version,
+        history.file_kind,
+        substr(mf.sha256, 1, 12) AS hash_prefix,
+        0 AS reference_count
+      FROM sticker_managed_file_history history
+      JOIN managed_files mf ON mf.file_id = history.managed_file_id
+      WHERE mf.status = 'committed'
+        AND mf.cleanup_status IS NULL
+        AND mf.file_kind IN ('sticker_original', 'sticker_thumbnail')
+        AND NOT EXISTS (
+          SELECT 1 FROM project_asset_refs refs WHERE refs.managed_file_id = mf.file_id
+        )
+        AND NOT EXISTS (
+          SELECT 1 FROM project_sticker_asset_refs project_refs
+          WHERE project_refs.stable_id = history.stable_id
+            AND project_refs.resource_version = history.resource_version
+        )
+        ${releaseReferenceClause}
+        AND NOT EXISTS (
+          SELECT 1 FROM asset_cleanup_request_items request_items
+          JOIN asset_cleanup_requests requests ON requests.request_id = request_items.request_id
+          WHERE request_items.managed_file_id = mf.file_id
+            AND requests.status IN ('pending_confirmation', 'queued')
+        )
+      ORDER BY history.stable_id, history.resource_version, history.file_kind, mf.file_id
+    `).all() as AssetCleanupCandidateView[];
+  }
+
+  private assertActiveAdmin(actorId: string) {
+    const admin = this.database.prepare(`
+      SELECT 1 AS allowed FROM users u
+      JOIN admin_access access ON access.user_id = u.user_id
+      WHERE u.user_id = ? AND u.role = 'super_admin' AND u.status = 'active' AND access.allowed = 1
+    `).get(actorId);
+    if (!admin) throw new Error("ASSET_CLEANUP_CANDIDATE_STALE");
+  }
+
+  private assetReferenceCount(fileId: string, requestId: string) {
+    const projectOrRelease = (this.database.prepare(`
+      SELECT COUNT(*) AS count FROM project_asset_refs WHERE managed_file_id = ?
+    `).get(fileId) as { count: number }).count;
+    const releaseItems = this.tableExists("sticker_release_items")
+      ? (this.database.prepare(`
+          SELECT COUNT(*) AS count FROM sticker_release_items
+          WHERE original_file_id = ? OR thumbnail_file_id = ?
+        `).get(fileId, fileId) as { count: number }).count
+      : 0;
+    const projectStickerRefs = (this.database.prepare(`
+      SELECT COUNT(*) AS count
+      FROM sticker_managed_file_history history
+      JOIN project_sticker_asset_refs refs
+        ON refs.stable_id = history.stable_id AND refs.resource_version = history.resource_version
+      WHERE history.managed_file_id = ?
+    `).get(fileId) as { count: number }).count;
+    const otherCleanup = (this.database.prepare(`
+      SELECT COUNT(*) AS count FROM asset_cleanup_request_items items
+      JOIN asset_cleanup_requests requests ON requests.request_id = items.request_id
+      WHERE items.managed_file_id = ? AND items.request_id <> ?
+        AND requests.status IN ('pending_confirmation', 'queued')
+    `).get(fileId, requestId) as { count: number }).count;
+    return projectOrRelease + releaseItems + projectStickerRefs + otherCleanup;
+  }
+
+  private cleanupConfirmationToken(requestId: string, actorId: string, keyDigest: string) {
+    return digest(`Dada/P0A/asset-cleanup-confirm/v1:${requestId}:${actorId}:${keyDigest}`);
+  }
+
+  private tableExists(name: string) {
+    return Boolean(this.database.prepare("SELECT 1 FROM sqlite_master WHERE type = 'table' AND name = ?").get(name));
+  }
+
+  private insertCleanupAudit(input: {
+    actorRef: string;
+    afterSummary: Record<string, unknown>;
+    operationType: string;
+    requestId: string;
+    result: "failed" | "succeeded";
+  }, occurredAt: number) {
+    this.database.prepare(`
+      INSERT INTO admin_operation_logs (
+        log_id, actor_type, actor_ref, operation_type, target_type, target_ref,
+        result, before_summary, after_summary, occurred_at, expires_at
+      ) VALUES (?, 'super_admin', ?, ?, 'asset_cleanup_request', ?, ?, NULL, ?, ?, ?)
+    `).run(
+      randomUUID(), input.actorRef, input.operationType, input.requestId, input.result,
+      serializeAuditSummary(input.afterSummary), occurredAt, auditExpiry(occurredAt),
+    );
+  }
+
   private activeReservationBytes(excludingOperationId?: string) {
     const row = this.database.prepare(`
       SELECT COALESCE(SUM(projected_bytes), 0) AS bytes
@@ -496,9 +690,11 @@ export class ManagedStorage {
     }
   }
 
-  async stagePrivateImage(input: {
+  async stageManagedImage(input: {
     content: Readable;
     expectedMimeType: "image/png" | "image/jpeg" | "image/webp";
+    expectedSha256?: string;
+    fileKind: ManagedFileKind;
     fileName: string;
     maximumBytes: number;
     operationId: string;
@@ -509,7 +705,7 @@ export class ManagedStorage {
     const destination = this.destination({
       content: input.content,
       expectedMimeType: input.expectedMimeType,
-      fileKind: "reference",
+      fileKind: input.fileKind,
       fileName: input.fileName,
       operationId: input.operationId,
       ownerRef: input.ownerRef,
@@ -537,6 +733,8 @@ export class ManagedStorage {
       await pipeline(input.content, inspect, createWriteStream(stagingPath, { flags: "wx" }));
       validatePositiveBytes(byteSize, "actual_write_bytes");
       if (sniffMime(prefix) !== input.expectedMimeType) throw new Error("content_mime_invalid");
+      const sha256 = hash.digest("hex");
+      if (input.expectedSha256 && sha256.toLowerCase() !== input.expectedSha256.toLowerCase()) throw new Error("content_hash_invalid");
       const state = this.getState();
       const otherReservations = this.activeReservationBytes(input.operationId);
       if (state.managed_content_bytes + otherReservations + byteSize > HARD_LIMIT_BYTES) {
@@ -549,12 +747,12 @@ export class ManagedStorage {
         bytes: byteSize,
         destinationPath: destination.absolutePath,
         fileId,
-        fileKind: "reference",
+        fileKind: input.fileKind,
         mimeType: input.expectedMimeType,
         operationId: input.operationId,
         ownerRef: input.ownerRef,
         relativePath: destination.relativePath,
-        sha256: hash.digest("hex"),
+        sha256,
         stagingDirectory,
         stagingPath,
       };
@@ -565,6 +763,18 @@ export class ManagedStorage {
     }
   }
 
+  async stagePrivateImage(input: {
+    content: Readable;
+    expectedMimeType: "image/png" | "image/jpeg" | "image/webp";
+    fileName: string;
+    maximumBytes: number;
+    operationId: string;
+    ownerRef: string;
+    projectedWriteBytes: number;
+  }): Promise<StagedManagedFile> {
+    return this.stageManagedImage({ ...input, fileKind: "reference" });
+  }
+
   moveStagedFile(file: StagedManagedFile) {
     mkdirSync(dirname(file.destinationPath), { recursive: true });
     renameSync(file.stagingPath, file.destinationPath);
@@ -676,6 +886,203 @@ export class ManagedStorage {
     this.database.prepare("DELETE FROM project_asset_refs WHERE managed_file_id = ?").run(fileId);
   }
 
+  listAssetCleanupCandidates(): AssetCleanupCandidatesView {
+    const createdAt = Date.now();
+    const expiresAt = createdAt + 5 * 60 * 1_000;
+    const items = this.readAssetCleanupCandidates();
+    const snapshotVersion = digest(JSON.stringify({
+      created_at: createdAt,
+      nonce: randomUUID(),
+      items: items.map((item) => ({ byte_size: item.byte_size, file_id: item.file_id, hash_prefix: item.hash_prefix })),
+    }));
+    this.database.prepare("DELETE FROM asset_cleanup_candidate_snapshots WHERE expires_at <= ?").run(createdAt);
+    this.database.prepare(`
+      INSERT INTO asset_cleanup_candidate_snapshots (
+        snapshot_version, items_json, created_at, expires_at
+      ) VALUES (?, ?, ?, ?)
+    `).run(snapshotVersion, JSON.stringify(items), createdAt, expiresAt);
+    return {
+      candidate_snapshot_version: snapshotVersion,
+      expires_at: new Date(expiresAt).toISOString(),
+      items,
+    };
+  }
+
+  createAssetCleanupIntent(input: {
+    actorId: string;
+    fileIds: string[];
+    idempotencyKey: string;
+    snapshotVersion: string;
+  }): AssetCleanupIntentView {
+    if (this.inspectAction("explicit_cleanup") !== "allow") throw new Error("cleanup_uncommitted");
+    const fileIds = [...new Set(input.fileIds)].sort();
+    if (!uuidPattern.test(input.actorId) || fileIds.length === 0 || fileIds.length !== input.fileIds.length
+      || fileIds.length > 100 || fileIds.some((fileId) => !uuidPattern.test(fileId))
+      || !/^[A-Za-z0-9_-]{32,200}$/.test(input.idempotencyKey)
+      || !/^[0-9a-f]{64}$/.test(input.snapshotVersion)) {
+      throw new Error("cleanup_candidates_invalid");
+    }
+    const keyDigest = digest(input.idempotencyKey);
+    const requestHash = digest(JSON.stringify({ file_ids: fileIds, snapshot_version: input.snapshotVersion }));
+    const existing = this.database.prepare(`
+      SELECT request_id, request_hash, expires_at, file_count, total_bytes, status
+      FROM asset_cleanup_requests
+      WHERE created_by = ? AND idempotency_key_digest = ?
+    `).get(input.actorId, keyDigest) as {
+      expires_at: number; file_count: number; request_hash: string; request_id: string; status: AssetCleanupIntentView["status"]; total_bytes: number;
+    } | undefined;
+    if (existing) {
+      if (existing.request_hash !== requestHash) throw new Error("IDEMPOTENCY_KEY_CONFLICT");
+      return {
+        confirmation_token: this.cleanupConfirmationToken(existing.request_id, input.actorId, keyDigest),
+        expires_at: new Date(existing.expires_at).toISOString(),
+        file_count: existing.file_count,
+        request_id: existing.request_id,
+        status: existing.status,
+        total_bytes: existing.total_bytes,
+      };
+    }
+
+    const requestId = randomUUID();
+    const confirmationToken = this.cleanupConfirmationToken(requestId, input.actorId, keyDigest);
+    const createdAt = Date.now();
+    let view!: AssetCleanupIntentView;
+    const transaction = this.database.transaction(() => {
+      this.assertActiveAdmin(input.actorId);
+      const snapshot = this.database.prepare(`
+        SELECT items_json, expires_at FROM asset_cleanup_candidate_snapshots
+        WHERE snapshot_version = ?
+      `).get(input.snapshotVersion) as { expires_at: number; items_json: string } | undefined;
+      if (!snapshot || snapshot.expires_at <= createdAt) throw new Error("ASSET_CLEANUP_CANDIDATE_STALE");
+      const snapshotItems = JSON.parse(snapshot.items_json) as AssetCleanupCandidateView[];
+      const byId = new Map(snapshotItems.map((item) => [item.file_id, item]));
+      const selected = fileIds.map((fileId) => byId.get(fileId));
+      if (selected.some((item) => !item)) throw new Error("ASSET_CLEANUP_CANDIDATE_STALE");
+      const current = new Map(this.readAssetCleanupCandidates().map((item) => [item.file_id, item]));
+      if (fileIds.some((fileId) => !current.has(fileId))) throw new Error("ASSET_CLEANUP_CANDIDATE_STALE");
+      const safeItems = selected as AssetCleanupCandidateView[];
+      const totalBytes = safeItems.reduce((sum, item) => sum + item.byte_size, 0);
+      this.database.prepare(`
+        INSERT INTO asset_cleanup_requests (
+          request_id, status, created_at, confirmed_at, created_by, confirmed_by,
+          snapshot_version, expires_at, confirmation_token_digest,
+          idempotency_key_digest, request_hash, file_count, total_bytes, denied_reason
+        ) VALUES (?, 'pending_confirmation', ?, NULL, ?, NULL, ?, ?, ?, ?, ?, ?, ?, NULL)
+      `).run(
+        requestId, new Date(createdAt).toISOString(), input.actorId, input.snapshotVersion,
+        snapshot.expires_at, digest(confirmationToken), keyDigest, requestHash, safeItems.length, totalBytes,
+      );
+      const insert = this.database.prepare(`
+        INSERT INTO asset_cleanup_request_items (
+          request_id, managed_file_id, stable_id, resource_version, file_kind, byte_size, sha256_prefix
+        ) VALUES (?, ?, ?, ?, ?, ?, ?)
+      `);
+      for (const item of safeItems) {
+        insert.run(requestId, item.file_id, item.stable_id, item.resource_version, item.file_kind, item.byte_size, item.hash_prefix);
+      }
+      this.insertCleanupAudit({
+        actorRef: input.actorId,
+        afterSummary: { file_count: safeItems.length, snapshot_version: input.snapshotVersion, total_bytes: totalBytes },
+        operationType: "asset_cleanup_requested",
+        requestId,
+        result: "succeeded",
+      }, createdAt);
+      view = {
+        confirmation_token: confirmationToken,
+        expires_at: new Date(snapshot.expires_at).toISOString(),
+        file_count: safeItems.length,
+        request_id: requestId,
+        status: "pending_confirmation",
+        total_bytes: totalBytes,
+      };
+    });
+    transaction.immediate();
+    return view;
+  }
+
+  confirmAssetCleanupIntent(input: { actorId: string; confirmationToken: string; requestId: string }) {
+    if (this.inspectAction("explicit_cleanup") !== "allow") throw new Error("cleanup_uncommitted");
+    if (!uuidPattern.test(input.actorId) || !uuidPattern.test(input.requestId) || !/^[0-9a-f]{64}$/.test(input.confirmationToken)) {
+      throw new Error("ASSET_CLEANUP_CANDIDATE_STALE");
+    }
+    const confirmedAt = Date.now();
+    const outcome = this.database.transaction(() => {
+      this.assertActiveAdmin(input.actorId);
+      const request = this.database.prepare(`
+        SELECT status, created_by, expires_at, confirmation_token_digest, file_count, total_bytes
+        FROM asset_cleanup_requests WHERE request_id = ?
+      `).get(input.requestId) as {
+        confirmation_token_digest: string | null; created_by: string | null; expires_at: number | null;
+        file_count: number | null; status: string; total_bytes: number | null;
+      } | undefined;
+      if (!request || request.status !== "pending_confirmation" || request.created_by !== input.actorId
+        || !request.expires_at || request.expires_at <= confirmedAt
+        || request.confirmation_token_digest !== digest(input.confirmationToken)) {
+        throw new Error("ASSET_CLEANUP_CANDIDATE_STALE");
+      }
+      const files = this.database.prepare(`
+        SELECT mf.file_id, mf.file_kind, mf.relative_path, mf.byte_size, mf.status
+        FROM asset_cleanup_request_items items
+        JOIN managed_files mf ON mf.file_id = items.managed_file_id
+        WHERE items.request_id = ? ORDER BY mf.file_id
+      `).all(input.requestId) as ManagedFileRow[];
+      if (files.length !== request.file_count) throw new Error("ASSET_CLEANUP_CANDIDATE_STALE");
+      const conflicted = files.some((file) => file.status !== "committed"
+        || !new Set(["sticker_original", "sticker_thumbnail"]).has(file.file_kind)
+        || this.assetReferenceCount(file.file_id, input.requestId) > 0);
+      if (conflicted) {
+        this.database.prepare(`
+          UPDATE asset_cleanup_requests
+          SET status = 'denied', confirmed_at = ?, confirmed_by = ?, denied_reason = 'reference_conflict'
+          WHERE request_id = ?
+        `).run(new Date(confirmedAt).toISOString(), input.actorId, input.requestId);
+        this.insertCleanupAudit({
+          actorRef: input.actorId,
+          afterSummary: { file_count: files.length, reason: "reference_conflict", status: "denied" },
+          operationType: "asset_cleanup_reference_denied",
+          requestId: input.requestId,
+          result: "failed",
+        }, confirmedAt);
+        return { conflict: true as const };
+      }
+
+      this.insertCleanupAudit({
+        actorRef: input.actorId,
+        afterSummary: { file_count: files.length, status: "validated" },
+        operationType: "asset_cleanup_validated",
+        requestId: input.requestId,
+        result: "succeeded",
+      }, confirmedAt);
+      for (const file of files) {
+        this.database.prepare(`
+          UPDATE managed_files SET status = 'purged', purged_at = ?, cleanup_status = 'pending_delete'
+          WHERE file_id = ? AND status = 'committed'
+        `).run(new Date(confirmedAt).toISOString(), file.file_id);
+        this.database.prepare(`
+          INSERT INTO file_cleanup_queue (
+            cleanup_id, managed_file_id, relative_path, byte_size, counts_toward_managed,
+            reason, status, created_at, completed_at, last_error
+          ) VALUES (?, ?, ?, ?, 1, 'purge', 'pending', ?, NULL, NULL)
+        `).run(randomUUID(), file.file_id, file.relative_path, file.byte_size, new Date(confirmedAt).toISOString());
+      }
+      this.database.prepare(`
+        UPDATE asset_cleanup_requests
+        SET status = 'queued', confirmed_at = ?, confirmed_by = ?
+        WHERE request_id = ?
+      `).run(new Date(confirmedAt).toISOString(), input.actorId, input.requestId);
+      this.insertCleanupAudit({
+        actorRef: input.actorId,
+        afterSummary: { file_count: files.length, status: "queued", total_bytes: request.total_bytes ?? 0 },
+        operationType: "asset_cleanup_scheduled",
+        requestId: input.requestId,
+        result: "succeeded",
+      }, confirmedAt + 1);
+      return { conflict: false as const, file_count: files.length, request_id: input.requestId, status: "queued" as const };
+    }).immediate();
+    if (outcome.conflict) throw new Error("ASSET_HISTORY_REFERENCE_CONFLICT");
+    return outcome;
+  }
+
   createCleanupIntent(fileIds: string[]) {
     if (this.inspectAction("explicit_cleanup") !== "allow") throw new Error("cleanup_uncommitted");
     if (fileIds.length === 0 || new Set(fileIds).size !== fileIds.length) throw new Error("cleanup_candidates_invalid");
@@ -761,6 +1168,7 @@ export class ManagedStorage {
             this.database.prepare("DELETE FROM project_asset_refs WHERE managed_file_id = ?").run(row.managed_file_id);
             const requests = this.database.prepare("SELECT request_id FROM asset_cleanup_request_items WHERE managed_file_id = ?").all(row.managed_file_id) as Array<{ request_id: string }>;
             this.database.prepare("DELETE FROM asset_cleanup_request_items WHERE managed_file_id = ?").run(row.managed_file_id);
+            this.database.prepare("DELETE FROM sticker_managed_file_history WHERE managed_file_id = ?").run(row.managed_file_id);
             this.database.prepare("DELETE FROM managed_files WHERE file_id = ?").run(row.managed_file_id);
             for (const request of requests) {
               const pendingItems = this.database.prepare("SELECT COUNT(*) AS count FROM asset_cleanup_request_items WHERE request_id = ?").get(request.request_id) as { count: number };
diff --git a/apps/api/src/projects.ts b/apps/api/src/projects.ts
index a65baf1..6d9a733 100644
--- a/apps/api/src/projects.ts
+++ b/apps/api/src/projects.ts
@@ -366,6 +366,7 @@ export class ProjectService {
         throw new ProjectError("project_state_conflict", latest);
       }
       this.insertProjectState({ canvasState: canvas, name, projectId: input.projectId, stateVersion: nextVersion }, now);
+      this.rebuildProjectStickerReferences(input.projectId, canvas, now);
       this.database.prepare(`
         INSERT INTO project_state_idempotency (
           owner_id, project_id, idempotency_key, request_hash, response_state_version, created_at
@@ -377,6 +378,25 @@ export class ProjectService {
     return result;
   }
 
+  private rebuildProjectStickerReferences(projectId: string, canvas: CanvasState, now: number) {
+    if (!this.tableExists("project_sticker_asset_refs")) return;
+    this.database.prepare("DELETE FROM project_sticker_asset_refs WHERE project_id = ?").run(projectId);
+    const insert = this.database.prepare(`
+      INSERT INTO project_sticker_asset_refs (reference_id, project_id, stable_id, resource_version, created_at)
+      VALUES (?, ?, ?, ?, ?)
+    `);
+    for (const element of canvas.elements) {
+      if (element.type !== "static_sticker") continue;
+      insert.run(
+        `project:${projectId}:sticker:${element.element_id}`,
+        projectId,
+        element.template_or_asset_id,
+        element.resource_version,
+        now,
+      );
+    }
+  }
+
   trashFailedEmpty(ownerId: string, projectIds: string[]) {
     const uniqueIds = [...new Set(projectIds)];
     if (uniqueIds.length === 0 || uniqueIds.length > projectLimit) throw new ProjectError("generation_state_invalid");
@@ -774,6 +794,16 @@ export class ProjectService {
         FOREIGN KEY (project_id) REFERENCES projects(project_id) ON DELETE CASCADE
       );
       CREATE INDEX IF NOT EXISTS project_resource_files_managed ON project_resource_files(managed_file_id, project_id);
+      CREATE TABLE IF NOT EXISTS project_sticker_asset_refs (
+        reference_id TEXT PRIMARY KEY,
+        project_id TEXT NOT NULL,
+        stable_id TEXT NOT NULL,
+        resource_version TEXT NOT NULL,
+        created_at INTEGER NOT NULL,
+        FOREIGN KEY (project_id) REFERENCES projects(project_id) ON DELETE CASCADE
+      );
+      CREATE INDEX IF NOT EXISTS project_sticker_asset_refs_lookup
+        ON project_sticker_asset_refs (stable_id, resource_version);
       CREATE TABLE IF NOT EXISTS latest_exports (
         project_id TEXT NOT NULL,
         format TEXT NOT NULL CHECK (format IN ('jpg', 'png')),
diff --git a/apps/api/src/sticker-release-errors.ts b/apps/api/src/sticker-release-errors.ts
new file mode 100644
index 0000000..ec5cc4a
--- /dev/null
+++ b/apps/api/src/sticker-release-errors.ts
@@ -0,0 +1,8 @@
+export class StickerReleaseError extends Error {
+  readonly httpStatus: number;
+
+  constructor(readonly reason: string, httpStatus = 400) {
+    super(reason);
+    this.httpStatus = httpStatus;
+  }
+}
diff --git a/apps/api/src/sticker-releases.ts b/apps/api/src/sticker-releases.ts
new file mode 100644
index 0000000..fc252a8
--- /dev/null
+++ b/apps/api/src/sticker-releases.ts
@@ -0,0 +1,556 @@
+import { createHash, randomUUID } from "node:crypto";
+import { readFileSync } from "node:fs";
+import { createRequire } from "node:module";
+import { basename, extname } from "node:path";
+import { Readable } from "node:stream";
+
+import type BetterSqlite3 from "better-sqlite3";
+import sharp, { type Metadata } from "sharp";
+
+import type { StaticStickerCatalogItem } from "@dada/static-sticker-catalog";
+
+import { ManagedStorage, type StagedManagedFile } from "./managed-storage.js";
+import { StickerReleaseError } from "./sticker-release-errors.js";
+import { classifyCapacity } from "./storage-policy.js";
+
+export { StickerReleaseError } from "./sticker-release-errors.js";
+
+const require = createRequire(import.meta.url);
+const Database = require("better-sqlite3") as typeof BetterSqlite3;
+const stableIdPattern = /^STK([0-9]{4,})$/;
+const idempotencyPattern = /^[A-Za-z0-9_-]{32,200}$/;
+const sha256Pattern = /^[0-9a-f]{64}$/i;
+const maximumOriginalBytes = 20 * 1024 * 1024;
+const maximumDimension = 8_192;
+const bundledPartCounts = [203, 36, 27, 48, 38, 75, 37, 67, 48, 24, 40, 30, 27, 51, 62, 19, 36, 45, 92, 53, 69, 31, 36, 30, 183] as const;
+
+type StickerMime = "image/png" | "image/webp";
+type StickerVariant = "original" | "thumbnail";
+
+interface StickerItemRow {
+  enabled: 0 | 1;
+  height: number;
+  mime_type: StickerMime;
+  order_index: number;
+  original_byte_size: number;
+  original_file_id: string;
+  original_filename: string;
+  original_relative_path: string;
+  original_sha256: string;
+  part: number;
+  release_version: string;
+  stable_id: string;
+  thumbnail_byte_size: number;
+  thumbnail_file_id: string;
+  thumbnail_relative_path: string;
+  thumbnail_sha256: string;
+  width: number;
+}
+
+export interface StickerUploadInput {
+  actorId: string;
+  content: Readable;
+  enabled: boolean;
+  expectedByteSize: number;
+  expectedMimeType: StickerMime;
+  expectedSha256: string;
+  fileName: string;
+  idempotencyKey: string;
+  order: number;
+  part: number;
+  stableId: string;
+}
+
+function digest(value: string) {
+  return createHash("sha256").update(value, "utf8").digest("hex");
+}
+
+function stableJson(value: unknown): string {
+  if (Array.isArray(value)) return `[${value.map(stableJson).join(",")}]`;
+  if (value && typeof value === "object") {
+    return `{${Object.entries(value).sort(([left], [right]) => left.localeCompare(right)).map(([key, item]) => `${JSON.stringify(key)}:${stableJson(item)}`).join(",")}}`;
+  }
+  return JSON.stringify(value);
+}
+
+function iso(timestamp: number) {
+  return new Date(timestamp).toISOString();
+}
+
+function itemView(row: StickerItemRow): StaticStickerCatalogItem {
+  const originalReference = `/api/v1/assets/public/${encodeURIComponent(row.release_version)}/${encodeURIComponent(row.stable_id)}`;
+  return {
+    enabled: row.enabled === 1,
+    height: row.height,
+    mime: row.mime_type,
+    mime_type: row.mime_type,
+    order: row.order_index,
+    original_filename: row.original_filename,
+    original_reference: originalReference,
+    origin: "admin_uploaded",
+    part: row.part,
+    relative_path: `static-stickers/${row.stable_id}${row.mime_type === "image/png" ? ".png" : ".webp"}`,
+    resource_version: row.release_version,
+    sha256: row.original_sha256,
+    stable_id: row.stable_id,
+    thumbnail_reference: {
+      media: "thumbnail",
+      resource_id: row.stable_id,
+      resource_version: row.release_version,
+      url: `${originalReference}?variant=thumbnail`,
+    },
+    width: row.width,
+  };
+}
+
+export class StickerReleaseService {
+  private readonly clock: () => number;
+  private readonly database: BetterSqlite3.Database;
+  private readonly storage: ManagedStorage;
+
+  constructor(input: { clock?: () => number; databasePath: string; storage: ManagedStorage }) {
+    this.clock = input.clock ?? Date.now;
+    const nativeBinding = process.env.DADA_SQLITE_NATIVE_BINDING;
+    this.database = new Database(input.databasePath, nativeBinding ? { nativeBinding } : undefined);
+    this.database.pragma("journal_mode = WAL");
+    this.database.pragma("foreign_keys = ON");
+    this.database.pragma("busy_timeout = 5000");
+    this.storage = input.storage;
+    this.migrate();
+  }
+
+  close() {
+    this.database.close();
+  }
+
+  async upload(input: StickerUploadInput) {
+    this.validateUpload(input);
+    const requestHash = digest(stableJson({
+      enabled: input.enabled,
+      expected_byte_size: input.expectedByteSize,
+      expected_mime_type: input.expectedMimeType,
+      expected_sha256: input.expectedSha256.toLowerCase(),
+      order: input.order,
+      part: input.part,
+      stable_id: input.stableId,
+    }));
+    const keyDigest = digest(input.idempotencyKey);
+    const receipt = this.database.prepare(`
+      SELECT request_hash, release_version FROM sticker_upload_receipts
+      WHERE actor_id = ? AND idempotency_key_digest = ?
+    `).get(input.actorId, keyDigest) as { release_version: string; request_hash: string } | undefined;
+    if (receipt) {
+      input.content.destroy();
+      if (receipt.request_hash !== requestHash) throw new StickerReleaseError("sticker_idempotency_conflict", 409);
+      return this.uploadResult(receipt.release_version, input.stableId, false);
+    }
+    this.assertNewPosition(input.stableId, input.part, input.order);
+
+    const staged: StagedManagedFile[] = [];
+    try {
+      const original = await this.storage.stageManagedImage({
+        content: input.content,
+        expectedMimeType: input.expectedMimeType,
+        expectedSha256: input.expectedSha256,
+        fileKind: "sticker_original",
+        fileName: `${input.stableId}${input.expectedMimeType === "image/png" ? ".png" : ".webp"}`,
+        maximumBytes: maximumOriginalBytes,
+        operationId: randomUUID(),
+        ownerRef: input.actorId,
+        projectedWriteBytes: input.expectedByteSize,
+      });
+      staged.push(original);
+      if (original.bytes !== input.expectedByteSize) throw new StickerReleaseError("content_size_invalid");
+
+      let metadata: Metadata;
+      let thumbnail: Buffer;
+      const decoder = sharp(readFileSync(original.stagingPath), { failOn: "warning", limitInputPixels: maximumDimension * maximumDimension });
+      try {
+        metadata = await decoder.metadata();
+        if (metadata.format !== (input.expectedMimeType === "image/png" ? "png" : "webp")
+          || !metadata.width || !metadata.height || metadata.width > maximumDimension || metadata.height > maximumDimension) {
+          throw new Error("content_decode_invalid");
+        }
+        thumbnail = await decoder
+          .rotate()
+          .resize({ fit: "inside", height: 256, width: 256, withoutEnlargement: true })
+          .png({ adaptiveFiltering: true, compressionLevel: 9 })
+          .toBuffer();
+      } catch {
+        throw new StickerReleaseError("content_decode_invalid");
+      } finally {
+        decoder.destroy();
+      }
+
+      const thumbnailStaged = await this.storage.stageManagedImage({
+        content: Readable.from(thumbnail),
+        expectedMimeType: "image/png",
+        fileKind: "sticker_thumbnail",
+        fileName: `${input.stableId}-thumbnail.png`,
+        maximumBytes: maximumOriginalBytes,
+        operationId: randomUUID(),
+        ownerRef: input.actorId,
+        projectedWriteBytes: thumbnail.byteLength,
+      });
+      staged.push(thumbnailStaged);
+      const releaseVersion = this.immediate(() => this.commitUpload({
+        ...input,
+        height: metadata.height!,
+        keyDigest,
+        original,
+        requestHash,
+        thumbnail: thumbnailStaged,
+        width: metadata.width!,
+      }));
+      return this.uploadResult(releaseVersion, input.stableId, true);
+    } catch (error) {
+      for (const file of staged) this.storage.abandonStagedFile(file);
+      if (!(error instanceof StickerReleaseError) && error instanceof Error
+        && new Set(["content_hash_invalid", "content_mime_invalid", "content_size_invalid", "file_name_invalid"]).has(error.message)) {
+        throw new StickerReleaseError("sticker_upload_invalid");
+      }
+      throw error;
+    }
+  }
+
+  update(input: { actorId: string; enabled?: boolean; order?: number; part?: number; stableId: string }) {
+    const current = this.currentVersion();
+    if (!current) throw new StickerReleaseError("sticker_not_found", 404);
+    const existing = this.readItem(current, input.stableId);
+    if (!existing) throw new StickerReleaseError("sticker_not_found", 404);
+    const part = input.part ?? existing.part;
+    const order = input.order ?? existing.order_index;
+    this.validatePosition(input.stableId, part, order);
+    const releaseVersion = this.immediate(() => {
+      const version = this.nextReleaseVersion();
+      this.copyRelease(current, version);
+      const conflict = this.database.prepare(`
+        SELECT stable_id FROM sticker_release_items
+        WHERE release_version = ? AND part = ? AND order_index = ? AND stable_id <> ?
+      `).get(version, part, order, input.stableId);
+      if (conflict) throw new StickerReleaseError("sticker_order_conflict", 409);
+      this.database.prepare(`
+        UPDATE sticker_release_items SET enabled = ?, part = ?, order_index = ?
+        WHERE release_version = ? AND stable_id = ?
+      `).run((input.enabled ?? existing.enabled === 1) ? 1 : 0, part, order, version, input.stableId);
+      this.finalizeRelease(version, current, input.actorId);
+      return version;
+    });
+    return { item: itemView(this.readItem(releaseVersion, input.stableId)!), release_version: releaseVersion };
+  }
+
+  listPublic(releaseVersion = this.currentVersion()) {
+    if (!releaseVersion) return { count: 0, items: [], release_version: null };
+    const exists = this.database.prepare("SELECT 1 FROM sticker_releases WHERE release_version = ?").get(releaseVersion);
+    if (!exists) return { count: 0, items: [], release_version: null };
+    const items = (this.database.prepare(`
+      SELECT * FROM sticker_release_items WHERE release_version = ? AND enabled = 1
+      ORDER BY part, order_index, stable_id
+    `).all(releaseVersion) as StickerItemRow[]).map(itemView);
+    return { count: items.length, items, release_version: releaseVersion };
+  }
+
+  adminView() {
+    const releaseVersion = this.currentVersion();
+    const items = releaseVersion
+      ? (this.database.prepare("SELECT * FROM sticker_release_items WHERE release_version = ? ORDER BY part, order_index, stable_id").all(releaseVersion) as StickerItemRow[])
+      : [];
+    return {
+      count: items.length,
+      items: items.map((row) => ({
+        ...itemView(row),
+        file_state: "committed" as const,
+        original_byte_size: row.original_byte_size,
+        thumbnail_byte_size: row.thumbnail_byte_size,
+      })),
+      release_version: releaseVersion,
+      storage: this.storage.getState(),
+    };
+  }
+
+  readPublicAsset(releaseVersion: string, stableId: string, variant: StickerVariant) {
+    const row = this.readItem(releaseVersion, stableId);
+    if (!row || row.enabled !== 1) return undefined;
+    const fileId = variant === "thumbnail" ? row.thumbnail_file_id : row.original_file_id;
+    const path = this.storage.resolveManagedFile(fileId);
+    if (!path) return undefined;
+    return {
+      bytes: readFileSync(path),
+      mimeType: variant === "thumbnail" ? "image/png" as const : row.mime_type,
+      sha256: variant === "thumbnail" ? row.thumbnail_sha256 : row.original_sha256,
+    };
+  }
+
+  inspectCounts() {
+    const count = (table: string) => (this.database.prepare(`SELECT COUNT(*) AS count FROM ${table}`).get() as { count: number }).count;
+    return { items: count("sticker_release_items"), releases: count("sticker_releases"), upload_receipts: count("sticker_upload_receipts") };
+  }
+
+  private uploadResult(releaseVersion: string, stableId: string, created: boolean) {
+    const row = this.readItem(releaseVersion, stableId);
+    if (!row) throw new StickerReleaseError("sticker_not_found", 404);
+    return {
+      created,
+      item: itemView(row),
+      original: { byte_size: row.original_byte_size, file_id: row.original_file_id, sha256: row.original_sha256 },
+      release_version: releaseVersion,
+      thumbnail: { byte_size: row.thumbnail_byte_size, file_id: row.thumbnail_file_id, sha256: row.thumbnail_sha256 },
+    };
+  }
+
+  private commitUpload(input: StickerUploadInput & {
+    height: number;
+    keyDigest: string;
+    original: StagedManagedFile;
+    requestHash: string;
+    thumbnail: StagedManagedFile;
+    width: number;
+  }) {
+    this.assertNewPosition(input.stableId, input.part, input.order);
+    const previous = this.currentVersion();
+    const releaseVersion = this.nextReleaseVersion();
+    if (previous) this.copyRelease(previous, releaseVersion);
+    for (const file of [input.original, input.thumbnail]) {
+      this.storage.moveStagedFile(file);
+      this.database.prepare(`
+        INSERT INTO managed_files (file_id, file_kind, owner_ref, relative_path, byte_size, mime_type, sha256, status, created_at)
+        VALUES (?, ?, ?, ?, ?, ?, ?, 'committed', ?)
+      `).run(file.fileId, file.fileKind, file.ownerRef, file.relativePath, file.bytes, file.mimeType, file.sha256, iso(this.clock()));
+    }
+    this.database.prepare(`
+      INSERT INTO sticker_release_items (
+        release_version, stable_id, part, order_index, original_filename, original_relative_path,
+        width, height, mime_type, original_sha256, original_file_id, original_byte_size,
+        thumbnail_file_id, thumbnail_relative_path, thumbnail_sha256, thumbnail_byte_size, enabled
+      ) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
+    `).run(
+      releaseVersion, input.stableId, input.part, input.order, input.fileName, input.original.relativePath,
+      input.width, input.height, input.expectedMimeType, input.original.sha256, input.original.fileId, input.original.bytes,
+      input.thumbnail.fileId, input.thumbnail.relativePath, input.thumbnail.sha256, input.thumbnail.bytes, input.enabled ? 1 : 0,
+    );
+    this.database.prepare(`
+      INSERT OR IGNORE INTO sticker_managed_file_history (
+        managed_file_id, stable_id, resource_version, file_kind, created_at
+      ) VALUES (?, ?, ?, 'original', ?), (?, ?, ?, 'thumbnail', ?)
+    `).run(
+      input.original.fileId, input.stableId, releaseVersion, this.clock(),
+      input.thumbnail.fileId, input.stableId, releaseVersion, this.clock(),
+    );
+    this.consumeStagedStorage([input.original, input.thumbnail]);
+    this.database.prepare(`
+      INSERT INTO sticker_upload_receipts (actor_id, idempotency_key_digest, request_hash, release_version, stable_id, created_at)
+      VALUES (?, ?, ?, ?, ?, ?)
+    `).run(input.actorId, input.keyDigest, input.requestHash, releaseVersion, input.stableId, iso(this.clock()));
+    this.finalizeRelease(releaseVersion, previous, input.actorId);
+    return releaseVersion;
+  }
+
+  private finalizeRelease(releaseVersion: string, previous: string | null, actorId: string) {
+    const rows = this.database.prepare(`
+      SELECT stable_id, part, order_index, original_sha256, thumbnail_sha256, enabled
+      FROM sticker_release_items WHERE release_version = ? ORDER BY stable_id
+    `).all(releaseVersion);
+    const manifestSha256 = digest(stableJson(rows));
+    this.database.prepare(`
+      INSERT INTO sticker_releases (release_version, previous_release_version, manifest_sha256, published_at, published_by)
+      VALUES (?, ?, ?, ?, ?)
+    `).run(releaseVersion, previous, manifestSha256, iso(this.clock()), actorId);
+    this.database.prepare(`
+      INSERT INTO current_sticker_release (singleton, release_version) VALUES (1, ?)
+      ON CONFLICT(singleton) DO UPDATE SET release_version = excluded.release_version
+    `).run(releaseVersion);
+    const files = this.database.prepare(`
+      SELECT original_file_id AS file_id FROM sticker_release_items WHERE release_version = ?
+      UNION SELECT thumbnail_file_id AS file_id FROM sticker_release_items WHERE release_version = ?
+    `).all(releaseVersion, releaseVersion) as Array<{ file_id: string }>;
+    for (const file of files) {
+      this.database.prepare(`
+        INSERT INTO project_asset_refs (reference_id, managed_file_id, reference_type, created_at)
+        VALUES (?, ?, 'release', ?)
+      `).run(`release:${releaseVersion}:${file.file_id}`, file.file_id, iso(this.clock()));
+    }
+  }
+
+  private copyRelease(from: string, to: string) {
+    this.database.prepare(`
+      INSERT INTO sticker_release_items (
+        release_version, stable_id, part, order_index, original_filename, original_relative_path,
+        width, height, mime_type, original_sha256, original_file_id, original_byte_size,
+        thumbnail_file_id, thumbnail_relative_path, thumbnail_sha256, thumbnail_byte_size, enabled
+      )
+      SELECT ?, stable_id, part, order_index, original_filename, original_relative_path,
+        width, height, mime_type, original_sha256, original_file_id, original_byte_size,
+        thumbnail_file_id, thumbnail_relative_path, thumbnail_sha256, thumbnail_byte_size, enabled
+      FROM sticker_release_items WHERE release_version = ?
+    `).run(to, from);
+  }
+
+  private consumeStagedStorage(files: StagedManagedFile[]) {
+    const timestamp = iso(this.clock());
+    for (const file of files) {
+      this.database.prepare(`
+        UPDATE storage_reservations SET status = 'consumed', resolved_at = ?
+        WHERE operation_id = ? AND status = 'active'
+      `).run(timestamp, file.operationId);
+    }
+    const total = files.reduce((sum, file) => sum + file.bytes, 0);
+    const state = this.database.prepare("SELECT managed_content_bytes FROM local_backend_storage_state WHERE singleton = 1").get() as { managed_content_bytes: number };
+    const active = this.database.prepare("SELECT COALESCE(SUM(projected_bytes), 0) AS bytes FROM storage_reservations WHERE status = 'active'").get() as { bytes: number };
+    const nextBytes = state.managed_content_bytes + total;
+    const classification = classifyCapacity(nextBytes, active.bytes);
+    this.database.prepare(`
+      UPDATE local_backend_storage_state
+      SET managed_content_bytes = ?, capacity_notice_level = ?, storage_status = ?, measured_at = ?, version = version + 1
+      WHERE singleton = 1
+    `).run(nextBytes, classification.capacity_notice_level, classification.storage_status, timestamp);
+  }
+
+  private currentVersion() {
+    return (this.database.prepare("SELECT release_version FROM current_sticker_release WHERE singleton = 1").get() as { release_version: string } | undefined)?.release_version ?? null;
+  }
+
+  private nextReleaseVersion() {
+    const date = new Date(this.clock()).toISOString().slice(0, 10).replaceAll("-", "");
+    const row = this.database.prepare("SELECT next_sequence FROM sticker_release_sequences WHERE release_date = ?").get(date) as { next_sequence: number } | undefined;
+    const sequence = row?.next_sequence ?? 1;
+    this.database.prepare(`
+      INSERT INTO sticker_release_sequences (release_date, next_sequence) VALUES (?, ?)
+      ON CONFLICT(release_date) DO UPDATE SET next_sequence = excluded.next_sequence
+    `).run(date, sequence + 1);
+    return `asset-${date}.${sequence}`;
+  }
+
+  private readItem(releaseVersion: string, stableId: string) {
+    return this.database.prepare("SELECT * FROM sticker_release_items WHERE release_version = ? AND stable_id = ?")
+      .get(releaseVersion, stableId) as StickerItemRow | undefined;
+  }
+
+  private assertNewPosition(stableId: string, part: number, order: number) {
+    this.validatePosition(stableId, part, order);
+    const current = this.currentVersion();
+    if (!current) return;
+    if (this.readItem(current, stableId)) throw new StickerReleaseError("sticker_stable_id_conflict", 409);
+    const conflict = this.database.prepare(`
+      SELECT stable_id FROM sticker_release_items WHERE release_version = ? AND part = ? AND order_index = ?
+    `).get(current, part, order);
+    if (conflict) throw new StickerReleaseError("sticker_order_conflict", 409);
+  }
+
+  private validatePosition(stableId: string, part: number, order: number) {
+    const matched = stableId.match(stableIdPattern);
+    const numericId = matched ? Number(matched[1]) : Number.NaN;
+    if (!matched || !Number.isSafeInteger(numericId) || numericId <= 1_407) throw new StickerReleaseError("sticker_stable_id_invalid");
+    if (!Number.isSafeInteger(part) || part < 1 || part > bundledPartCounts.length
+      || !Number.isSafeInteger(order) || order <= bundledPartCounts[part - 1]!) {
+      throw new StickerReleaseError("sticker_part_order_invalid");
+    }
+  }
+
+  private validateUpload(input: StickerUploadInput) {
+    this.validatePosition(input.stableId, input.part, input.order);
+    if (!/^[0-9a-f-]{36}$/i.test(input.actorId) || !idempotencyPattern.test(input.idempotencyKey)
+      || !sha256Pattern.test(input.expectedSha256) || !Number.isSafeInteger(input.expectedByteSize)
+      || input.expectedByteSize <= 0 || input.expectedByteSize > maximumOriginalBytes
+      || !new Set(["image/png", "image/webp"]).has(input.expectedMimeType)) {
+      throw new StickerReleaseError("sticker_upload_invalid");
+    }
+    const expectedExtension = input.expectedMimeType === "image/png" ? ".png" : ".webp";
+    if (input.fileName.length > 255 || basename(input.fileName) !== input.fileName || /[\u0000-\u001f]/.test(input.fileName)
+      || extname(input.fileName).toLowerCase() !== expectedExtension) throw new StickerReleaseError("sticker_upload_invalid");
+  }
+
+  private immediate<T>(action: () => T) {
+    this.database.exec("BEGIN IMMEDIATE");
+    try {
+      const result = action();
+      this.database.exec("COMMIT");
+      return result;
+    } catch (error) {
+      if (this.database.inTransaction) this.database.exec("ROLLBACK");
+      throw error;
+    }
+  }
+
+  private migrate() {
+    this.database.exec(`
+      CREATE TABLE IF NOT EXISTS sticker_release_sequences (
+        release_date TEXT PRIMARY KEY,
+        next_sequence INTEGER NOT NULL CHECK (next_sequence >= 1)
+      );
+      CREATE TABLE IF NOT EXISTS sticker_releases (
+        release_version TEXT PRIMARY KEY,
+        previous_release_version TEXT,
+        manifest_sha256 TEXT NOT NULL CHECK (length(manifest_sha256) = 64),
+        published_at TEXT NOT NULL,
+        published_by TEXT NOT NULL
+      );
+      CREATE TABLE IF NOT EXISTS sticker_release_items (
+        release_version TEXT NOT NULL,
+        stable_id TEXT NOT NULL,
+        part INTEGER NOT NULL CHECK (part BETWEEN 1 AND 25),
+        order_index INTEGER NOT NULL CHECK (order_index > 0),
+        original_filename TEXT NOT NULL,
+        original_relative_path TEXT NOT NULL,
+        width INTEGER NOT NULL CHECK (width > 0),
+        height INTEGER NOT NULL CHECK (height > 0),
+        mime_type TEXT NOT NULL CHECK (mime_type IN ('image/png', 'image/webp')),
+        original_sha256 TEXT NOT NULL CHECK (length(original_sha256) = 64),
+        original_file_id TEXT NOT NULL REFERENCES managed_files(file_id),
+        original_byte_size INTEGER NOT NULL CHECK (original_byte_size > 0),
+        thumbnail_file_id TEXT NOT NULL REFERENCES managed_files(file_id),
+        thumbnail_relative_path TEXT NOT NULL,
+        thumbnail_sha256 TEXT NOT NULL CHECK (length(thumbnail_sha256) = 64),
+        thumbnail_byte_size INTEGER NOT NULL CHECK (thumbnail_byte_size > 0),
+        enabled INTEGER NOT NULL CHECK (enabled IN (0, 1)),
+        PRIMARY KEY (release_version, stable_id),
+        UNIQUE (release_version, part, order_index)
+      );
+      CREATE TABLE IF NOT EXISTS current_sticker_release (
+        singleton INTEGER PRIMARY KEY CHECK (singleton = 1),
+        release_version TEXT NOT NULL
+      );
+      CREATE TABLE IF NOT EXISTS sticker_upload_receipts (
+        actor_id TEXT NOT NULL,
+        idempotency_key_digest TEXT NOT NULL CHECK (length(idempotency_key_digest) = 64),
+        request_hash TEXT NOT NULL CHECK (length(request_hash) = 64),
+        release_version TEXT NOT NULL,
+        stable_id TEXT NOT NULL,
+        created_at TEXT NOT NULL,
+        PRIMARY KEY (actor_id, idempotency_key_digest)
+      );
+      CREATE TABLE IF NOT EXISTS sticker_managed_file_history (
+        managed_file_id TEXT NOT NULL,
+        stable_id TEXT NOT NULL,
+        resource_version TEXT NOT NULL,
+        file_kind TEXT NOT NULL CHECK (file_kind IN ('original', 'thumbnail')),
+        created_at INTEGER NOT NULL,
+        PRIMARY KEY (managed_file_id, file_kind),
+        FOREIGN KEY (managed_file_id) REFERENCES managed_files(file_id)
+      );
+      CREATE TRIGGER IF NOT EXISTS sticker_releases_no_update
+      BEFORE UPDATE ON sticker_releases BEGIN SELECT RAISE(ABORT, 'sticker_releases_immutable'); END;
+      CREATE TRIGGER IF NOT EXISTS sticker_releases_no_delete
+      BEFORE DELETE ON sticker_releases BEGIN SELECT RAISE(ABORT, 'sticker_releases_immutable'); END;
+      CREATE TRIGGER IF NOT EXISTS sticker_release_items_no_update
+      BEFORE UPDATE ON sticker_release_items
+      WHEN EXISTS (SELECT 1 FROM sticker_releases WHERE release_version = OLD.release_version)
+      BEGIN SELECT RAISE(ABORT, 'sticker_release_items_immutable'); END;
+      CREATE TRIGGER IF NOT EXISTS sticker_release_items_no_delete
+      BEFORE DELETE ON sticker_release_items
+      WHEN EXISTS (SELECT 1 FROM sticker_releases WHERE release_version = OLD.release_version)
+      BEGIN SELECT RAISE(ABORT, 'sticker_release_items_immutable'); END;
+    `);
+    this.database.exec(`
+      INSERT OR IGNORE INTO sticker_managed_file_history (
+        managed_file_id, stable_id, resource_version, file_kind, created_at
+      )
+      SELECT original_file_id, stable_id, release_version, 'original', strftime('%s', 'now') * 1000
+      FROM sticker_release_items;
+      INSERT OR IGNORE INTO sticker_managed_file_history (
+        managed_file_id, stable_id, resource_version, file_kind, created_at
+      )
+      SELECT thumbnail_file_id, stable_id, release_version, 'thumbnail', strftime('%s', 'now') * 1000
+      FROM sticker_release_items;
+    `);
+  }
+}
diff --git a/apps/web/src/admin-assets.css b/apps/web/src/admin-assets.css
new file mode 100644
index 0000000..99d4fb7
--- /dev/null
+++ b/apps/web/src/admin-assets.css
@@ -0,0 +1,71 @@
+.admin-assets-page { min-height: 100vh; color: #111111; background: #f6f6f4; }
+.admin-assets-page > main { width: min(1360px, calc(100% - 64px)); margin: 0 auto; padding: 36px 0 80px; }
+.admin-assets-heading { display: flex; align-items: end; justify-content: space-between; gap: 24px; padding-bottom: 18px; border-bottom: 1px solid #999993; }
+.admin-assets-heading p { margin: 0 0 4px; font: 700 11px Consolas, monospace; }
+.admin-assets-heading h1 { margin: 0; font-size: 34px; }
+.admin-assets-heading > strong { font: 700 13px Consolas, monospace; }
+.admin-assets-summary { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); margin: 22px 0; border-block: 1px solid #8c8c86; background: #ffffff; }
+.admin-assets-summary > span { display: grid; min-width: 0; gap: 6px; padding: 17px 18px; border-right: 1px solid #c1c1ba; color: #65655f; font-size: 12px; }
+.admin-assets-summary > span:last-child { border-right: 0; }
+.admin-assets-summary strong { color: #111111; font-size: 15px; overflow-wrap: anywhere; }
+.admin-assets-summary .is-active { color: #1f6639; }
+.admin-assets-summary .is-full,
+.admin-assets-summary .is-unavailable { color: #9b2c23; }
+.admin-assets-upload,
+.admin-assets-list { margin-top: 22px; border-block: 1px solid #8c8c86; background: #ffffff; }
+.admin-assets-upload > header,
+.admin-assets-list > header { display: flex; align-items: center; justify-content: space-between; min-height: 54px; padding: 0 16px; border-bottom: 1px solid #c1c1ba; background: #e7e7e2; }
+.admin-assets-upload h2,
+.admin-assets-list h2 { margin: 0; font-size: 16px; }
+.admin-assets-upload header span,
+.admin-assets-list header span { font: 700 11px Consolas, monospace; }
+.admin-assets-form { display: grid; grid-template-columns: minmax(230px, 2fr) minmax(130px, 1fr) 84px 92px 130px auto; align-items: end; gap: 12px; padding: 18px 16px; }
+.admin-assets-form label { display: grid; gap: 6px; min-width: 0; color: #4c4c47; font-size: 11px; font-weight: 800; }
+.admin-assets-form input { width: 100%; min-height: 40px; padding: 7px 9px; border: 1px solid #777770; border-radius: 0; background: #ffffff; }
+.admin-assets-form input[type="file"] { padding: 7px; }
+.admin-assets-form .admin-assets-enabled { display: flex; min-height: 40px; align-items: center; gap: 8px; color: #111111; }
+.admin-assets-enabled input { width: 18px; min-height: 18px; }
+.admin-assets-form button,
+.admin-assets-alert button { min-height: 42px; padding: 9px 14px; border: 1px solid #111111; border-radius: 0; background: #f2f500; font-weight: 900; }
+.admin-assets-form button:disabled { color: #777770; background: #dfdfda; cursor: not-allowed; }
+.admin-assets-blocked { margin: 0; padding: 12px 16px; border-top: 1px solid #e2b8b3; color: #812219; background: #fff1ef; font-weight: 700; }
+.admin-assets-table-wrap { overflow-x: auto; }
+.admin-assets-table-wrap table { width: 100%; min-width: 1120px; border-collapse: collapse; table-layout: fixed; }
+.admin-assets-table-wrap th,
+.admin-assets-table-wrap td { padding: 12px 10px; border-right: 1px solid #d0d0ca; border-bottom: 1px solid #d0d0ca; text-align: left; vertical-align: middle; font-size: 12px; }
+.admin-assets-table-wrap thead th { background: #f1f1ed; font-weight: 900; }
+.admin-assets-table-wrap th:first-child { width: 78px; }
+.admin-assets-table-wrap th:nth-child(2) { width: 150px; }
+.admin-assets-table-wrap th:nth-child(3) { width: 140px; }
+.admin-assets-table-wrap th:nth-child(4) { width: 210px; }
+.admin-assets-table-wrap th:nth-child(5) { width: 92px; }
+.admin-assets-table-wrap th:nth-child(6),
+.admin-assets-table-wrap th:nth-child(7) { width: 92px; }
+.admin-assets-table-wrap th:last-child { width: 180px; }
+.admin-assets-table-wrap img { display: block; width: 48px; height: 48px; object-fit: contain; border: 1px solid #c1c1ba; background: #f6f6f4; }
+.admin-assets-table-wrap strong,
+.admin-assets-table-wrap small { display: block; }
+.admin-assets-table-wrap small { margin-top: 4px; color: #65655f; font-size: 10px; overflow-wrap: anywhere; }
+.admin-assets-table-wrap input[type="number"] { width: 70px; min-height: 34px; margin-top: 5px; padding: 5px 7px; border: 1px solid #777770; border-radius: 0; }
+.admin-assets-table-wrap td:last-child { display: flex; gap: 6px; }
+.admin-assets-table-wrap button { min-height: 34px; padding: 6px 8px; border: 1px solid #555550; border-radius: 0; background: #ffffff; font-weight: 800; }
+.admin-assets-table-wrap button:disabled { color: #8a8a84; background: #ecece8; }
+.admin-assets-table-wrap .is-enabled { color: #1f6639; font-weight: 800; }
+.admin-assets-table-wrap .is-disabled { color: #812219; font-weight: 800; }
+.admin-assets-empty { margin: 0; padding: 34px 16px; color: #65655f; }
+.admin-assets-notice { margin: 16px 0 0; padding: 13px 16px; border-left: 4px solid #287b45; background: #edf8f0; font-weight: 800; }
+.admin-assets-alert { display: flex; align-items: center; justify-content: space-between; gap: 16px; margin-top: 24px; padding: 16px; border-left: 5px solid #d14a3b; background: #fff1ef; }
+.admin-assets-loading { display: grid; gap: 10px; margin-top: 24px; }
+.admin-assets-loading span { display: block; height: 62px; background: #dfdfda; }
+@media (max-width: 900px) {
+  .admin-assets-page > main { width: 100%; padding-right: 16px; padding-left: 16px; }
+  .admin-assets-summary { grid-template-columns: 1fr; }
+  .admin-assets-summary > span { border-right: 0; border-bottom: 1px solid #c1c1ba; }
+  .admin-assets-form { grid-template-columns: 1fr 1fr; }
+}
+@media (max-width: 580px) {
+  .admin-product-header { padding: 0 12px; overflow-x: auto; }
+  .admin-product-header nav a { min-width: 66px; }
+  .admin-assets-form { grid-template-columns: 1fr; }
+  .admin-assets-heading { align-items: start; flex-direction: column; }
+}
diff --git a/apps/web/src/admin-assets.tsx b/apps/web/src/admin-assets.tsx
new file mode 100644
index 0000000..ad40c50
--- /dev/null
+++ b/apps/web/src/admin-assets.tsx
@@ -0,0 +1,191 @@
+import { useEffect, useMemo, useState } from "react";
+
+import "./admin-assets.css";
+
+interface AdminSession { csrf_token: string }
+interface StorageState {
+  capacity_notice_level: "normal" | "warning" | "critical";
+  hard_limit_bytes: number;
+  managed_content_bytes: number;
+  storage_status: "active" | "full" | "unavailable";
+}
+interface AdminSticker {
+  enabled: boolean;
+  file_state: "committed";
+  height: number;
+  mime_type: "image/png" | "image/webp";
+  order: number;
+  original_byte_size: number;
+  original_filename: string;
+  part: number;
+  resource_version: string;
+  stable_id: string;
+  thumbnail_byte_size: number;
+  thumbnail_reference: { url: string };
+  width: number;
+}
+interface AdminAssetsResponse {
+  count: number;
+  items: AdminSticker[];
+  release_version: string | null;
+  storage: StorageState;
+}
+
+function idempotencyKey() {
+  return crypto.randomUUID().replaceAll("-", "") + crypto.randomUUID().replaceAll("-", "");
+}
+
+function bytesLabel(bytes: number) {
+  return new Intl.NumberFormat("zh-CN", { maximumFractionDigits: 2, minimumFractionDigits: 2 }).format(bytes / (1024 ** 3));
+}
+
+async function loadJson<T>(url: string, init?: RequestInit) {
+  const response = await fetch(url, { credentials: "same-origin", ...init });
+  const body = response.headers.get("content-type")?.includes("application/json") ? await response.json() as T : undefined;
+  return { body, response };
+}
+
+export function AdminAssetsPage() {
+  const [session, setSession] = useState<AdminSession>();
+  const [assets, setAssets] = useState<AdminAssetsResponse>();
+  const [loadingFailed, setLoadingFailed] = useState(false);
+  const [busy, setBusy] = useState(false);
+  const [notice, setNotice] = useState("");
+  const [file, setFile] = useState<File>();
+  const [stableId, setStableId] = useState("STK1408");
+  const [part, setPart] = useState(25);
+  const [order, setOrder] = useState(184);
+  const [enabled, setEnabled] = useState(true);
+  const [orderDrafts, setOrderDrafts] = useState<Record<string, number>>({});
+
+  async function load() {
+    setLoadingFailed(false);
+    try {
+      const [sessionResult, assetsResult] = await Promise.all([
+        loadJson<AdminSession>("/api/v1/admin-auth/session"),
+        loadJson<AdminAssetsResponse>("/api/v1/admin/assets/static-stickers"),
+      ]);
+      if (!sessionResult.response.ok || !assetsResult.response.ok || !sessionResult.body || !assetsResult.body) throw new Error("load_failed");
+      setSession(sessionResult.body);
+      setAssets(assetsResult.body);
+      setOrderDrafts(Object.fromEntries(assetsResult.body.items.map((item) => [item.stable_id, item.order])));
+      const numericIds = assetsResult.body.items.map((item) => Number(item.stable_id.slice(3))).filter(Number.isFinite);
+      setStableId(`STK${Math.max(1407, ...numericIds) + 1}`);
+      setOrder(Math.max(183, ...assetsResult.body.items.filter((item) => item.part === 25).map((item) => item.order)) + 1);
+      setNotice("");
+    } catch {
+      setLoadingFailed(true);
+    }
+  }
+
+  useEffect(() => { void load(); }, []);
+
+  const uploadBlocked = !assets || assets.storage.storage_status !== "active";
+  const formValid = useMemo(() => Boolean(
+    file && /^(image\/png|image\/webp)$/.test(file.type) && /^STK[0-9]{4,}$/.test(stableId)
+      && Number.isSafeInteger(part) && part >= 1 && part <= 25 && Number.isSafeInteger(order) && order > 0,
+  ), [file, order, part, stableId]);
+
+  async function upload() {
+    if (!file || !session || !formValid || uploadBlocked || busy) return;
+    setBusy(true);
+    setNotice("");
+    try {
+      const sha256 = Array.from(new Uint8Array(await crypto.subtle.digest("SHA-256", await file.arrayBuffer())))
+        .map((byte) => byte.toString(16).padStart(2, "0")).join("");
+      const form = new FormData();
+      form.append("stable_id", stableId);
+      form.append("part", String(part));
+      form.append("order", String(order));
+      form.append("enabled", String(enabled));
+      form.append("original_byte_size", String(file.size));
+      form.append("original_sha256", sha256);
+      form.append("sticker_file", file, file.name);
+      const response = await fetch("/api/v1/admin/assets/static-stickers", {
+        body: form,
+        credentials: "same-origin",
+        headers: { "Idempotency-Key": idempotencyKey(), "X-CSRF-Token": session.csrf_token },
+        method: "POST",
+      });
+      if (!response.ok) {
+        setNotice(response.status === 507 ? "存储容量已满或暂不可用，未写入任何文件。" : response.status === 409 ? "稳定 ID 或 part 顺序已存在。" : "文件格式、内容或字段校验未通过。");
+        return;
+      }
+      setFile(undefined);
+      await load();
+      setNotice("贴纸已生成缩略图并发布新资源版本。");
+    } catch {
+      setNotice("上传未完成，未发布新资源版本。");
+    } finally {
+      setBusy(false);
+    }
+  }
+
+  async function update(item: AdminSticker, change: { enabled?: boolean; order?: number }) {
+    if (!session || busy) return;
+    setBusy(true);
+    setNotice("");
+    try {
+      const { response } = await loadJson(`/api/v1/admin/assets/static-stickers/${encodeURIComponent(item.stable_id)}`, {
+        body: JSON.stringify(change),
+        headers: { "Content-Type": "application/json", "X-CSRF-Token": session.csrf_token },
+        method: "PATCH",
+      });
+      if (!response.ok) throw new Error("update_failed");
+      await load();
+      setNotice(change.enabled === false ? "贴纸已停用，新项目目录不再显示。" : change.enabled === true ? "贴纸已重新启用。" : "part 顺序已发布到新资源版本。");
+    } catch {
+      setNotice("素材状态未更新。");
+    } finally {
+      setBusy(false);
+    }
+  }
+
+  return <div className="admin-assets-page">
+    <header className="admin-product-header">
+      <a href="/admin">DADA ADMIN</a>
+      <nav aria-label="后台导航"><a href="/admin/users">用户</a><a href="/admin/models">模型</a><a aria-current="page" href="/admin/assets">素材</a><a href="/admin/audit">审计</a></nav>
+    </header>
+    <main>
+      <header className="admin-assets-heading"><div><p>ASSET OPERATIONS</p><h1>普通贴纸</h1></div><strong>{assets?.release_version ?? "尚未发布"}</strong></header>
+      {!assets && !loadingFailed ? <div aria-label="贴纸素材加载中" className="admin-assets-loading"><span /><span /><span /></div> : null}
+      {loadingFailed ? <p className="admin-assets-alert" role="alert">素材状态暂时无法读取。<button onClick={() => void load()} type="button">重试</button></p> : null}
+      {assets ? <>
+        <div className="admin-assets-summary" aria-label="素材存储摘要">
+          <span>后台贴纸<strong>{assets.count}</strong></span>
+          <span>受管内容<strong>{bytesLabel(assets.storage.managed_content_bytes)} / {bytesLabel(assets.storage.hard_limit_bytes)} GB</strong></span>
+          <span>存储状态<strong className={`is-${assets.storage.storage_status}`}>{assets.storage.storage_status}</strong></span>
+        </div>
+        <section className="admin-assets-upload" aria-labelledby="asset-upload-title">
+          <header><h2 id="asset-upload-title">上传并发布</h2><span>PNG / WebP</span></header>
+          <div className="admin-assets-form">
+            <label>文件<input accept="image/png,image/webp" aria-label="贴纸文件" disabled={uploadBlocked || busy} key={file?.name ?? "empty"} onChange={(event) => setFile(event.target.files?.[0])} type="file" /></label>
+            <label>稳定 ID<input aria-label="稳定 ID" disabled={uploadBlocked || busy} onChange={(event) => setStableId(event.target.value.toUpperCase())} value={stableId} /></label>
+            <label>Part<input aria-label="Part" disabled={uploadBlocked || busy} max="25" min="1" onChange={(event) => setPart(Number(event.target.value))} type="number" value={part} /></label>
+            <label>顺序<input aria-label="顺序" disabled={uploadBlocked || busy} min="1" onChange={(event) => setOrder(Number(event.target.value))} type="number" value={order} /></label>
+            <label className="admin-assets-enabled"><input checked={enabled} disabled={uploadBlocked || busy} onChange={(event) => setEnabled(event.target.checked)} type="checkbox" />发布后启用</label>
+            <button disabled={!formValid || uploadBlocked || busy} onClick={() => void upload()} type="button">{busy ? "处理中" : "上传并发布"}</button>
+          </div>
+          {uploadBlocked ? <p className="admin-assets-blocked" role="status">当前存储状态禁止新增原图和缩略图。</p> : null}
+        </section>
+        <section className="admin-assets-list" aria-labelledby="asset-list-title">
+          <header><h2 id="asset-list-title">当前版本</h2><span>{assets.count} 项</span></header>
+          {assets.items.length === 0 ? <p className="admin-assets-empty">当前没有后台上传的普通贴纸。</p> : <div className="admin-assets-table-wrap"><table>
+            <thead><tr><th>预览</th><th>稳定 ID</th><th>Part / 顺序</th><th>原文件</th><th>尺寸</th><th>文件状态</th><th>发布状态</th><th>操作</th></tr></thead>
+            <tbody>{assets.items.map((item) => <tr key={item.stable_id}>
+              <td><img alt="" src={item.thumbnail_reference.url} /></td>
+              <th scope="row"><strong>{item.stable_id}</strong><small>{item.resource_version}</small></th>
+              <td><span>part{item.part}</span><input aria-label={`${item.stable_id} 顺序`} min="1" onChange={(event) => setOrderDrafts((current) => ({ ...current, [item.stable_id]: Number(event.target.value) }))} type="number" value={orderDrafts[item.stable_id] ?? item.order} /></td>
+              <td><span>{item.original_filename}</span><small>{item.mime_type} · {item.original_byte_size.toLocaleString("zh-CN")} B</small></td>
+              <td>{item.width} x {item.height}</td>
+              <td>{item.file_state}</td>
+              <td><span className={item.enabled ? "is-enabled" : "is-disabled"}>{item.enabled ? "已启用" : "已停用"}</span></td>
+              <td><button disabled={busy || (orderDrafts[item.stable_id] ?? item.order) === item.order} onClick={() => void update(item, { order: orderDrafts[item.stable_id] ?? item.order })} type="button">更新顺序</button><button disabled={busy} onClick={() => void update(item, { enabled: !item.enabled })} type="button">{item.enabled ? "停用" : "启用"}</button></td>
+            </tr>)}</tbody>
+          </table></div>}
+        </section>
+        {notice ? <p className="admin-assets-notice" role="status">{notice}</p> : null}
+      </> : null}
+    </main>
+  </div>;
+}
diff --git a/apps/web/src/admin-models.tsx b/apps/web/src/admin-models.tsx
index f6259d0..9c679bf 100644
--- a/apps/web/src/admin-models.tsx
+++ b/apps/web/src/admin-models.tsx
@@ -149,7 +149,7 @@ export function AdminModelsPage() {
     <div className="admin-models-page">
       <header className="admin-product-header">
         <a href="/admin">DADA ADMIN</a>
-        <nav aria-label="后台导航"><a href="/admin/users">用户</a><a aria-current="page" href="/admin/models">模型</a><a href="/admin/audit">审计</a></nav>
+        <nav aria-label="后台导航"><a href="/admin/users">用户</a><a aria-current="page" href="/admin/models">模型</a><a href="/admin/assets">素材</a><a href="/admin/audit">审计</a></nav>
       </header>
       <main>
         <header className="admin-models-heading">
diff --git a/apps/web/src/admin-users.tsx b/apps/web/src/admin-users.tsx
index 6e08ea9..2dcb2d6 100644
--- a/apps/web/src/admin-users.tsx
+++ b/apps/web/src/admin-users.tsx
@@ -102,7 +102,7 @@ export function AdminUsersPage() {
     <div className="admin-users-page">
       <header className="admin-product-header">
         <a href="/admin">DADA ADMIN</a>
-        <nav aria-label="后台导航"><a aria-current="page" href="/admin/users">用户</a><a href="/admin/models">模型</a><a href="/admin/audit">审计</a></nav>
+        <nav aria-label="后台导航"><a aria-current="page" href="/admin/users">用户</a><a href="/admin/models">模型</a><a href="/admin/assets">素材</a><a href="/admin/audit">审计</a></nav>
       </header>
       <main>
         <header className="admin-users-heading">
diff --git a/apps/web/src/editor-page.tsx b/apps/web/src/editor-page.tsx
index c47b9bb..b3bb69c 100644
--- a/apps/web/src/editor-page.tsx
+++ b/apps/web/src/editor-page.tsx
@@ -49,7 +49,7 @@ import {
   type DynamicTemplateId,
 } from "./dynamic-provider.js";
 import { dynamicFontOptionsFor } from "./dynamic-render-models.js";
-import { P0A_STATIC_STICKER_CATALOG, P0A_STATIC_STICKER_COUNT, stickerWindow } from "./static-sticker-catalog.js";
+import { P0A_STATIC_STICKER_CATALOG, stickerWindow, type StaticStickerCatalogItem } from "./static-sticker-catalog.js";
 import {
   createColorCardElement,
   extractPaletteFromImage,
@@ -136,6 +136,7 @@ export function EditorPage({ projectId }: { projectId: string }) {
   const [notice, setNotice] = useState("");
   const [activePanel, setActivePanel] = useState<EditorAssetPanel>("background");
   const [stickerScrollTop, setStickerScrollTop] = useState(0);
+  const [stickerCatalog, setStickerCatalog] = useState<StaticStickerCatalogItem[]>(P0A_STATIC_STICKER_CATALOG);
   const [selectedIds, setSelectedIds] = useState<string[]>([]);
   const [guides, setGuides] = useState<string[]>([]);
   const [multiMode, setMultiMode] = useState(false);
@@ -187,6 +188,18 @@ export function EditorPage({ projectId }: { projectId: string }) {
     return () => { active = false; };
   }, [session?.user.user_id]);
 
+  useEffect(() => {
+    let active = true;
+    readEditorJson<{ items: StaticStickerCatalogItem[] }>("/api/v1/static-stickers/current")
+      .then((response) => {
+        if (!active) return;
+        const uploaded = response.items.filter((item) => item.enabled && item.origin === "admin_uploaded");
+        setStickerCatalog([...P0A_STATIC_STICKER_CATALOG, ...uploaded].sort((left, right) => left.part - right.part || left.order - right.order || left.stable_id.localeCompare(right.stable_id)));
+      })
+      .catch(() => { if (active) setStickerCatalog(P0A_STATIC_STICKER_CATALOG); });
+    return () => { active = false; };
+  }, []);
+
   useEffect(() => {
     if (!project || !session || !canvasState) return undefined;
     const queue = new ProjectAutoSaveQueue({
@@ -343,15 +356,15 @@ export function EditorPage({ projectId }: { projectId: string }) {
     setNotice(message);
   }
 
-  function addSticker(assetId: string) {
+  function addSticker(sticker: StaticStickerCatalogItem) {
     const controller = controllerForCurrent();
     if (!controller || !canvasState) return;
     try {
       controller.add(createStaticStickerElement({
-        assetId,
+        assetId: sticker.stable_id,
         identity: newElementIdentity(),
         position: { x: 0.5, y: 0.5 },
-        resourceVersion: "fixture-v1",
+        resourceVersion: sticker.resource_version,
         zIndex: canvasState.elements.length,
       }));
       commitElementOperation(controller, "贴纸已加入画布");
@@ -832,11 +845,11 @@ export function EditorPage({ projectId }: { projectId: string }) {
             {...(templateCategory ? { category: templateCategory } : {})}
           /> : null}
           {activePanel === "stickers" ? (() => {
-            const visibleStickers = stickerWindow(P0A_STATIC_STICKER_CATALOG, stickerScrollTop, 280);
-            return <section><h2>普通贴纸</h2><p aria-live="polite" className="editor-sticker-count">共 {P0A_STATIC_STICKER_COUNT.toLocaleString("zh-CN")} 张</p><div className="editor-sticker-virtual-list" data-testid="static-sticker-list" onScroll={(event) => setStickerScrollTop(event.currentTarget.scrollTop)} role="list">
+            const visibleStickers = stickerWindow(stickerCatalog, stickerScrollTop, 280);
+            return <section><h2>普通贴纸</h2><p aria-live="polite" className="editor-sticker-count">共 {stickerCatalog.length.toLocaleString("zh-CN")} 张</p><div className="editor-sticker-virtual-list" data-testid="static-sticker-list" onScroll={(event) => setStickerScrollTop(event.currentTarget.scrollTop)} role="list">
               <div style={{ paddingTop: visibleStickers.top_spacer_px, paddingBottom: visibleStickers.bottom_spacer_px }}>
                 <div className="editor-sticker-grid">
-                  {visibleStickers.items.map((sticker) => <button aria-label={`添加贴纸 ${sticker.stable_id}`} data-sticker-id={sticker.stable_id} disabled={!canEdit || canvasState.elements.length >= 50} key={sticker.stable_id} onClick={() => addSticker(sticker.stable_id)} type="button"><img alt="" className="editor-sticker-preview" decoding="async" loading="lazy" src={sticker.thumbnail_reference.url} /><strong>{sticker.stable_id}</strong><span>part{sticker.part} · {sticker.order}</span></button>)}
+                  {visibleStickers.items.map((sticker) => <button aria-label={`添加贴纸 ${sticker.stable_id}`} data-sticker-id={sticker.stable_id} disabled={!canEdit || canvasState.elements.length >= 50} key={sticker.stable_id} onClick={() => addSticker(sticker)} type="button"><img alt="" className="editor-sticker-preview" decoding="async" loading="lazy" src={sticker.thumbnail_reference.url} /><strong>{sticker.stable_id}</strong><span>part{sticker.part} · {sticker.order}</span></button>)}
                 </div>
               </div>
             </div>{canvasState.elements.length >= 50 ? <p className="editor-limit" role="status">画布最多 50 个元素，请先删除现有元素。</p> : null}</section>;
diff --git a/apps/web/src/main.tsx b/apps/web/src/main.tsx
index a619e0b..fcf4950 100644
--- a/apps/web/src/main.tsx
+++ b/apps/web/src/main.tsx
@@ -7,6 +7,7 @@ import { UserAuthPage } from "./user-auth.js";
 import { AccountSettingsPage } from "./account-settings.js";
 import { AdminUsersPage } from "./admin-users.js";
 import { AdminModelsPage } from "./admin-models.js";
+import { AdminAssetsPage } from "./admin-assets.js";
 import { CreditsPage } from "./credits-page.js";
 import { ProjectDetailPage, ProjectsPage, WorkspacePage } from "./project-pages.js";
 import { EditorPage } from "./editor-page.js";
@@ -36,6 +37,7 @@ function renderAuthenticationEntry() {
   else if (window.location.pathname === "/app") authenticationPage = <WorkspacePage key={authRevision} />;
   else if (window.location.pathname === "/admin/users") authenticationPage = <AdminUsersPage key={authRevision} />;
   else if (window.location.pathname === "/admin/models") authenticationPage = <AdminModelsPage key={authRevision} />;
+  else if (window.location.pathname === "/admin/assets") authenticationPage = <AdminAssetsPage key={authRevision} />;
   else if (window.location.pathname.startsWith("/admin")) authenticationPage = <AdminAuthPage key={authRevision} />;
   else authenticationPage = <UserAuthPage key={authRevision} />;
   appRoot.render(
diff --git a/apps/web/src/static-sticker-catalog.ts b/apps/web/src/static-sticker-catalog.ts
index 2e098c9..d0c77c2 100644
--- a/apps/web/src/static-sticker-catalog.ts
+++ b/apps/web/src/static-sticker-catalog.ts
@@ -45,3 +45,4 @@ export function stickerWindow(items: readonly StaticStickerCatalogItem[], scroll
 }
 
 export { staticStickerOriginalUrl, staticStickerThumbnailUrl };
+export type { StaticStickerCatalogItem };
diff --git a/apps/worker/src/project-purge-cleanup.ts b/apps/worker/src/project-purge-cleanup.ts
index 7ad034a..76d0edb 100644
--- a/apps/worker/src/project-purge-cleanup.ts
+++ b/apps/worker/src/project-purge-cleanup.ts
@@ -1,5 +1,5 @@
 import { randomUUID } from "node:crypto";
-import { rmSync } from "node:fs";
+import { existsSync, rmSync, statSync } from "node:fs";
 import { createRequire } from "node:module";
 import { isAbsolute, relative, resolve } from "node:path";
 
@@ -29,6 +29,40 @@ interface FileCleanupRow {
 const resourceScope = JSON.stringify([
   "project_state", "generation", "generated_image", "reference", "location", "latest_export",
 ]);
+const auditRetentionMilliseconds = 180 * 24 * 60 * 60 * 1_000;
+const auditRefPattern = /^[A-Za-z0-9][A-Za-z0-9_.:-]{0,159}$/;
+const forbiddenSummaryKeys = new Set([
+  "absolute_path", "api_key", "body", "code_hmac", "content", "credential", "email", "image",
+  "image_content", "password", "path", "prompt", "secret", "session_token", "verification_code", "whitelist",
+]);
+const forbiddenSummaryFragments = ["content", "credential", "email", "image", "password", "path", "prompt", "secret", "token"];
+
+function isSafeAuditRef(value: unknown) {
+  return typeof value === "string" && auditRefPattern.test(value) ? 1 : 0;
+}
+
+function isSafeAuditSummaryJson(value: unknown) {
+  if (typeof value !== "string" || Buffer.byteLength(value, "utf8") > 2_048) return 0;
+  try {
+    const valid = (entry: unknown, depth: number): boolean => {
+      if (depth > 3) return false;
+      if (entry === null || typeof entry === "boolean") return true;
+      if (typeof entry === "number") return Number.isSafeInteger(entry);
+      if (typeof entry === "string") return /^[A-Za-z0-9_.:@-]{1,160}$/.test(entry) && !entry.includes("@");
+      if (Array.isArray(entry)) return entry.length <= 20 && entry.every((item) => valid(item, depth + 1));
+      if (!entry || typeof entry !== "object") return false;
+      return Object.entries(entry).length <= 32 && Object.entries(entry).every(([key, item]) => (
+        auditRefPattern.test(key)
+        && !forbiddenSummaryKeys.has(key.toLowerCase())
+        && !forbiddenSummaryFragments.some((fragment) => key.toLowerCase().includes(fragment))
+        && valid(item, depth + 1)
+      ));
+    };
+    return valid(JSON.parse(value), 0) ? 1 : 0;
+  } catch {
+    return 0;
+  }
+}
 
 function iso(timestamp: number) {
   return new Date(timestamp).toISOString();
@@ -47,6 +81,12 @@ export class ProjectPurgeCleanup {
     this.database.pragma("journal_mode = WAL");
     this.database.pragma("foreign_keys = ON");
     this.database.pragma("busy_timeout = 5000");
+    this.database.function("dada_audit_ref_is_safe", { deterministic: true }, isSafeAuditRef);
+    this.database.function("dada_audit_summary_is_safe", { deterministic: true }, isSafeAuditSummaryJson);
+    this.database.function("dada_allow_privacy_purge", { deterministic: false }, () => 0);
+    this.database.function("dada_privacy_purge_subject", { deterministic: false }, () => "");
+    this.database.function("dada_allow_retention_purge", { deterministic: false }, () => 0);
+    this.database.function("dada_retention_purge_now", { deterministic: false }, () => 0);
   }
 
   close() {
@@ -153,12 +193,16 @@ export class ProjectPurgeCleanup {
                   if (pending.count === 0) {
                     this.database.prepare("UPDATE asset_cleanup_requests SET status = 'completed' WHERE request_id = ? AND status = 'queued'")
                       .run(request.request_id);
+                    this.insertAssetCleanupAudit(request.request_id, row.byte_size, this.clock());
                   }
                 }
               }
             }
+            if (this.tableExists("sticker_managed_file_history")) {
+              this.database.prepare("DELETE FROM sticker_managed_file_history WHERE managed_file_id = ?").run(row.managed_file_id);
+            }
             this.database.prepare("DELETE FROM managed_files WHERE file_id = ?").run(row.managed_file_id);
-            if (this.tableExists("local_backend_storage_state")) this.decrementManagedCapacity(row.byte_size);
+            if (this.tableExists("local_backend_storage_state")) this.remeasureManagedCapacity();
           }
           this.database.prepare(`
             UPDATE file_cleanup_queue SET status = 'completed', completed_at = ?, last_error = NULL
@@ -238,4 +282,46 @@ export class ProjectPurgeCleanup {
       WHERE singleton = 1
     `).run(managed, notice, status, iso(this.clock()));
   }
+
+  private insertAssetCleanupAudit(requestId: string, deletedBytes: number, occurredAt: number) {
+    if (!this.tableExists("admin_operation_logs")) return;
+    this.database.prepare(`
+      INSERT INTO admin_operation_logs (
+        log_id, actor_type, actor_ref, operation_type, target_type, target_ref,
+        result, before_summary, after_summary, occurred_at, expires_at
+      ) VALUES (?, 'system', 'project_purge_worker', 'asset_cleanup_physical_completed', 'asset_cleanup', ?, 'succeeded', NULL, ?, ?, ?)
+    `).run(
+      randomUUID(), requestId, JSON.stringify({ deleted_bytes: deletedBytes, status: "completed" }), occurredAt,
+      occurredAt + auditRetentionMilliseconds,
+    );
+  }
+
+  private remeasureManagedCapacity() {
+    const state = this.database.prepare(`
+      SELECT managed_content_bytes FROM local_backend_storage_state WHERE singleton = 1
+    `).get() as { managed_content_bytes: number } | undefined;
+    if (!state) return;
+    const rows = this.database.prepare(`
+      SELECT relative_path FROM managed_files WHERE status = 'committed'
+    `).all() as Array<{ relative_path: string }>;
+    let managed = 0;
+    for (const row of rows) {
+      try {
+        const path = this.resolveManagedPath(row.relative_path);
+        if (existsSync(path)) managed += statSync(path).size;
+      } catch {
+        // A missing or invalid path is excluded from the measured physical total.
+      }
+    }
+    const reservations = this.tableExists("storage_reservations")
+      ? (this.database.prepare("SELECT COALESCE(SUM(projected_bytes), 0) AS bytes FROM storage_reservations WHERE status = 'active'").get() as { bytes: number }).bytes
+      : 0;
+    const notice = managed < 4_294_967_296 ? "normal" : managed < 4_831_838_208 ? "warning" : "critical";
+    const status = managed + reservations >= 5_368_709_120 ? "full" : "active";
+    this.database.prepare(`
+      UPDATE local_backend_storage_state
+      SET managed_content_bytes = ?, capacity_notice_level = ?, storage_status = ?, measured_at = ?, version = version + 1
+      WHERE singleton = 1
+    `).run(managed, notice, status, iso(this.clock()));
+  }
 }
diff --git a/package.json b/package.json
index f86b620..a523784 100644
--- a/package.json
+++ b/package.json
@@ -14,7 +14,7 @@
     "test:integration": "vitest run tests/integration",
     "test:api": "pnpm check:openapi && vitest run tests/api",
     "test:worker": "pnpm --filter @dada/worker build && node scripts/worker-smoke.mjs && vitest run tests/worker",
-    "test:e2e": "pnpm check:openapi && playwright test tests/e2e/event-sync.spec.ts tests/e2e/support-gate.spec.ts tests/e2e/local-data-boundary.spec.ts tests/e2e/storage-capacity.spec.ts tests/e2e/public-asset-cache.spec.ts tests/e2e/user-auth.spec.ts tests/e2e/admin-auth.spec.ts tests/e2e/entry-state-ui.spec.ts tests/e2e/session-invalid-ui.spec.ts tests/e2e/user-registration.spec.ts tests/e2e/account-settings.spec.ts tests/e2e/projects-workspace.spec.ts tests/e2e/project-autosave-conflict.spec.ts tests/e2e/project-trash.spec.ts tests/e2e/credits.spec.ts tests/e2e/generation-workspace.spec.ts tests/e2e/generation-terminal-actions.spec.ts tests/e2e/project-latest-exports.spec.ts tests/e2e/admin-models.spec.ts tests/e2e/wp4-01-editor-background.spec.ts tests/e2e/wp4-02-editor-elements.spec.ts tests/e2e/wp4-03-text-editor.spec.ts tests/e2e/wp4-04-color-dynamic.spec.ts tests/e2e/wp4-05-export.spec.ts tests/e2e/wp4-06-accessibility.spec.ts tests/e2e/wp5-02-static-sticker-catalog.spec.ts tests/e2e/wp5-03-template-registry.spec.ts --config playwright.config.ts",
+    "test:e2e": "pnpm check:openapi && playwright test tests/e2e/event-sync.spec.ts tests/e2e/support-gate.spec.ts tests/e2e/local-data-boundary.spec.ts tests/e2e/storage-capacity.spec.ts tests/e2e/public-asset-cache.spec.ts tests/e2e/user-auth.spec.ts tests/e2e/admin-auth.spec.ts tests/e2e/entry-state-ui.spec.ts tests/e2e/session-invalid-ui.spec.ts tests/e2e/user-registration.spec.ts tests/e2e/account-settings.spec.ts tests/e2e/projects-workspace.spec.ts tests/e2e/project-autosave-conflict.spec.ts tests/e2e/project-trash.spec.ts tests/e2e/credits.spec.ts tests/e2e/generation-workspace.spec.ts tests/e2e/generation-terminal-actions.spec.ts tests/e2e/project-latest-exports.spec.ts tests/e2e/admin-models.spec.ts tests/e2e/wp4-01-editor-background.spec.ts tests/e2e/wp4-02-editor-elements.spec.ts tests/e2e/wp4-03-text-editor.spec.ts tests/e2e/wp4-04-color-dynamic.spec.ts tests/e2e/wp4-05-export.spec.ts tests/e2e/wp4-06-accessibility.spec.ts tests/e2e/wp5-02-static-sticker-catalog.spec.ts tests/e2e/wp5-03-template-registry.spec.ts tests/e2e/wp5-04-resource-isolation.spec.ts tests/e2e/wp5-05-admin-assets.spec.ts --config playwright.config.ts",
     "test:visual": "node scripts/run-wp4-07-layer.mjs visual",
     "test:performance": "node scripts/run-wp4-07-layer.mjs performance",
     "test:security": "node scripts/verify-frozen-dependencies.mjs && node scripts/redaction-scan.mjs",
@@ -94,7 +94,11 @@
     "test:wp5-02:red": "node scripts/run-wp5-02-validation.mjs --phase red",
     "preview:wp5-02": "node scripts/run-wp5-02-manual-preview.mjs",
     "test:wp5-03": "node scripts/run-wp5-03-validation.mjs",
-    "test:wp5-03:red": "node scripts/run-wp5-03-validation.mjs --phase red"
+    "test:wp5-03:red": "node scripts/run-wp5-03-validation.mjs --phase red",
+    "test:wp5-04": "node scripts/run-wp5-04-validation.mjs",
+    "test:wp5-04:red": "node scripts/run-wp5-04-validation.mjs --phase red",
+    "test:wp5-05": "node scripts/run-wp5-05-validation.mjs",
+    "test:wp5-05:red": "node scripts/run-wp5-05-validation.mjs --phase red"
   },
   "devDependencies": {
     "@playwright/test": "1.62.0",
diff --git a/packages/asset-release-manifest/package.json b/packages/asset-release-manifest/package.json
new file mode 100644
index 0000000..ee64052
--- /dev/null
+++ b/packages/asset-release-manifest/package.json
@@ -0,0 +1,18 @@
+{
+  "name": "@dada/asset-release-manifest",
+  "version": "0.0.0",
+  "private": true,
+  "type": "module",
+  "exports": {
+    ".": "./dist/index.js"
+  },
+  "types": "./dist/index.d.ts",
+  "scripts": {
+    "build": "tsc -p tsconfig.json",
+    "typecheck": "tsc --noEmit -p tsconfig.json"
+  },
+  "devDependencies": {
+    "@types/node": "24.13.3",
+    "typescript": "7.0.2"
+  }
+}
diff --git a/packages/asset-release-manifest/src/index.ts b/packages/asset-release-manifest/src/index.ts
new file mode 100644
index 0000000..388ed51
--- /dev/null
+++ b/packages/asset-release-manifest/src/index.ts
@@ -0,0 +1,180 @@
+import { createHash } from "node:crypto";
+import { posix, win32 } from "node:path";
+
+export const ASSET_ACCESS_CLASSES = [
+  "public_release_asset",
+  "internal_preview_asset",
+  "private_user_asset",
+] as const;
+
+export type AssetAccessClass = typeof ASSET_ACCESS_CLASSES[number];
+export type PublicAssetCacheKind = "font" | "template_conversion" | "thumbnail";
+
+export interface AssetReleaseItemInput {
+  access_class: AssetAccessClass;
+  cache_kind?: PublicAssetCacheKind;
+  content: Uint8Array;
+  mime_type: string;
+  owner_id?: string;
+  relative_path: string;
+  resource_id: string;
+  root_ref: string;
+  sha256?: string;
+}
+
+export interface AssetReleaseManifestInput {
+  items: readonly AssetReleaseItemInput[];
+  release_version: string;
+}
+
+export interface AssetReleaseManifestItem {
+  access_class: AssetAccessClass;
+  byte_size: number;
+  cache_kind?: PublicAssetCacheKind;
+  mime_type: string;
+  release_version: string;
+  resource_id: string;
+  sha256: string;
+  url: string;
+}
+
+export interface AssetReleaseManifestProjection {
+  items: readonly AssetReleaseManifestItem[];
+  manifest_sha256: string;
+  release_version: string;
+  schema_version: "AssetReleaseManifest/v1";
+}
+
+export interface AssetReleasePayload {
+  accessClass: AssetAccessClass;
+  bytes: Buffer;
+  mimeType: string;
+  ownerId?: string;
+  releaseVersion: string;
+  resourceId: string;
+  sha256: string;
+}
+
+export interface AssetReleaseReader {
+  project(
+    accessClass: AssetAccessClass,
+    releaseVersion: string,
+    options?: { ownerId?: string; resourceIds?: readonly string[] },
+  ): AssetReleaseManifestProjection | undefined;
+  read(accessClass: AssetAccessClass, releaseVersion: string, resourceId: string): AssetReleasePayload | undefined;
+}
+
+interface StoredItem {
+  accessClass: AssetAccessClass;
+  bytes: Buffer;
+  cacheKind?: PublicAssetCacheKind;
+  mimeType: string;
+  ownerId?: string;
+  projection: AssetReleaseManifestItem;
+  relativePath: string;
+  rootRef: string;
+  sha256: string;
+}
+
+const releaseVersionPattern = /^[a-z0-9][a-z0-9._-]{0,79}$/i;
+const resourceIdPattern = /^[0-9a-f]{8}-[0-9a-f]{4}-4[0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}$/i;
+const sha256Pattern = /^[0-9a-f]{64}$/;
+const rootRefPattern = /^[a-z0-9][a-z0-9._-]{0,79}$/i;
+
+function assetUrl(accessClass: AssetAccessClass, releaseVersion: string, resourceId: string) {
+  if (accessClass === "public_release_asset") return `/api/v1/assets/public/${releaseVersion}/${resourceId}`;
+  if (accessClass === "internal_preview_asset") return `/api/v1/assets/preview/${releaseVersion}/${resourceId}`;
+  return `/api/v1/private-assets/${releaseVersion}/${resourceId}`;
+}
+
+function isSafeRelativePath(value: string) {
+  if (!value || value.includes("\\") || posix.isAbsolute(value) || win32.isAbsolute(value)) return false;
+  const segments = value.split("/");
+  return segments.every((segment) => segment.length > 0 && segment !== "." && segment !== "..");
+}
+
+function sha256(value: string | Uint8Array) {
+  return createHash("sha256").update(value).digest("hex");
+}
+
+function immutableProjection(input: Omit<AssetReleaseManifestProjection, "manifest_sha256">): AssetReleaseManifestProjection {
+  const items = input.items.map((item) => Object.freeze({ ...item }));
+  const manifestBody = JSON.stringify({ ...input, items });
+  return Object.freeze({ ...input, items: Object.freeze(items), manifest_sha256: sha256(manifestBody) });
+}
+
+function validateItem(item: AssetReleaseItemInput, releaseVersion: string, seenIds: Set<string>): StoredItem {
+  if (!ASSET_ACCESS_CLASSES.includes(item.access_class)) throw new Error("asset access class is unsupported");
+  if (!resourceIdPattern.test(item.resource_id) || seenIds.has(item.resource_id)) throw new Error("resource_id must be a unique opaque UUID");
+  seenIds.add(item.resource_id);
+  if (!rootRefPattern.test(item.root_ref)) throw new Error("root_ref is invalid");
+  if (!isSafeRelativePath(item.relative_path)) throw new Error("relative path must stay within its declared root");
+  if (!/^[a-z0-9.+-]+\/[a-z0-9.+-]+$/i.test(item.mime_type)) throw new Error("mime_type is invalid");
+  if (item.access_class === "public_release_asset" && !item.cache_kind) throw new Error("public release asset requires an allowlisted cache kind");
+  if (item.access_class !== "public_release_asset" && item.cache_kind) throw new Error("non-public assets cannot declare a public cache kind");
+  if (item.access_class === "private_user_asset" && !item.owner_id) throw new Error("private user asset requires owner_id");
+  if (item.access_class !== "private_user_asset" && item.owner_id) throw new Error("only private user assets can declare owner_id");
+
+  const bytes = Buffer.from(item.content);
+  const digest = sha256(bytes);
+  if (item.sha256 !== undefined && (!sha256Pattern.test(item.sha256) || item.sha256 !== digest)) {
+    throw new Error("file SHA-256 does not match content");
+  }
+  const projection: AssetReleaseManifestItem = {
+    access_class: item.access_class,
+    byte_size: bytes.byteLength,
+    ...(item.cache_kind ? { cache_kind: item.cache_kind } : {}),
+    mime_type: item.mime_type,
+    release_version: releaseVersion,
+    resource_id: item.resource_id,
+    sha256: digest,
+    url: assetUrl(item.access_class, releaseVersion, item.resource_id),
+  };
+  return {
+    accessClass: item.access_class,
+    bytes,
+    ...(item.cache_kind ? { cacheKind: item.cache_kind } : {}),
+    mimeType: item.mime_type,
+    ...(item.owner_id ? { ownerId: item.owner_id } : {}),
+    projection: Object.freeze(projection),
+    relativePath: item.relative_path,
+    rootRef: item.root_ref,
+    sha256: digest,
+  };
+}
+
+export function createAssetReleaseManifest(input: AssetReleaseManifestInput): AssetReleaseReader {
+  if (!releaseVersionPattern.test(input.release_version)) throw new Error("release_version is invalid");
+  const seenIds = new Set<string>();
+  const items = input.items
+    .map((item) => validateItem(item, input.release_version, seenIds))
+    .sort((left, right) => left.projection.resource_id.localeCompare(right.projection.resource_id));
+
+  return Object.freeze({
+    project(accessClass: AssetAccessClass, releaseVersion: string, options: { ownerId?: string; resourceIds?: readonly string[] } = {}) {
+      if (releaseVersion !== input.release_version) return undefined;
+      const selected = items.filter((item) => item.accessClass === accessClass
+        && (accessClass !== "private_user_asset" || Boolean(options.ownerId) && item.ownerId === options.ownerId)
+        && (!options.resourceIds || options.resourceIds.includes(item.projection.resource_id)));
+      return immutableProjection({
+        items: selected.map((item) => item.projection),
+        release_version: input.release_version,
+        schema_version: "AssetReleaseManifest/v1",
+      });
+    },
+    read(accessClass: AssetAccessClass, releaseVersion: string, resourceId: string) {
+      if (releaseVersion !== input.release_version) return undefined;
+      const item = items.find((candidate) => candidate.accessClass === accessClass && candidate.projection.resource_id === resourceId);
+      if (!item) return undefined;
+      return {
+        accessClass: item.accessClass,
+        bytes: Buffer.from(item.bytes),
+        mimeType: item.mimeType,
+        ...(item.ownerId ? { ownerId: item.ownerId } : {}),
+        releaseVersion,
+        resourceId,
+        sha256: item.sha256,
+      };
+    },
+  });
+}
diff --git a/packages/asset-release-manifest/tsconfig.json b/packages/asset-release-manifest/tsconfig.json
new file mode 100644
index 0000000..af3b298
--- /dev/null
+++ b/packages/asset-release-manifest/tsconfig.json
@@ -0,0 +1,13 @@
+{
+  "extends": "../../tsconfig.base.json",
+  "compilerOptions": {
+    "module": "NodeNext",
+    "moduleResolution": "NodeNext",
+    "lib": ["ES2024"],
+    "types": ["node"],
+    "declaration": true,
+    "outDir": "dist",
+    "rootDir": "src"
+  },
+  "include": ["src"]
+}
diff --git a/packages/static-sticker-catalog/src/index.ts b/packages/static-sticker-catalog/src/index.ts
index 3c5450f..0fc7f0e 100644
--- a/packages/static-sticker-catalog/src/index.ts
+++ b/packages/static-sticker-catalog/src/index.ts
@@ -16,8 +16,8 @@ export interface StaticStickerCatalogItem {
   relative_path: string;
   width: number;
   height: number;
-  mime_type: "image/png";
-  mime: "image/png";
+  mime_type: "image/png" | "image/webp";
+  mime: "image/png" | "image/webp";
   sha256: string;
   original_reference: string;
   thumbnail_reference: StaticStickerThumbnailReference;
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 72c2fdb..c78c144 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -38,9 +38,15 @@ importers:
 
   apps/api:
     dependencies:
+      '@dada/asset-release-manifest':
+        specifier: workspace:*
+        version: link:../../packages/asset-release-manifest
       '@dada/shared-contracts':
         specifier: workspace:*
         version: link:../../packages/shared-contracts
+      '@dada/static-sticker-catalog':
+        specifier: workspace:*
+        version: link:../../packages/static-sticker-catalog
       '@fastify/multipart':
         specifier: 10.1.0
         version: 10.1.0
@@ -59,6 +65,9 @@ importers:
       fastify:
         specifier: 5.10.0
         version: 5.10.0
+      sharp:
+        specifier: 0.35.3
+        version: 0.35.3(@types/node@24.13.3)
     devDependencies:
       '@types/better-sqlite3':
         specifier: 7.6.13
@@ -151,6 +160,15 @@ importers:
         specifier: 7.0.2
         version: 7.0.2
 
+  packages/asset-release-manifest:
+    devDependencies:
+      '@types/node':
+        specifier: 24.13.3
+        version: 24.13.3
+      typescript:
+        specifier: 7.0.2
+        version: 7.0.2
+
   packages/asset-renderer:
     dependencies:
       '@dada/template-registry':
@@ -259,6 +277,168 @@ packages:
   '@fastify/swagger@9.8.1':
     resolution: {integrity: sha512-VpHMnqZTY8iBZYJE8WWkbKPrXIYWy2rDfIf5qLr6DzZSpQYZ+KxQVcJFiq/AMlvNwI4gCBd66++iUlxXXGT0IQ==}
 
+  '@img/colour@1.1.0':
+    resolution: {integrity: sha512-Td76q7j57o/tLVdgS746cYARfSyxk8iEfRxewL9h4OMzYhbW4TAcppl0mT4eyqXddh6L/jwoM75mo7ixa/pCeQ==}
+    engines: {node: '>=18'}
+
+  '@img/sharp-darwin-arm64@0.35.3':
+    resolution: {integrity: sha512-RMnFX7YQsMoh7lWfcM4NEHHymBX/rLuKNPVM84XE9ONPcaSCDgE7CHIHpSgPcO2xcRthgBy1HfNO319mwhIAkg==}
+    engines: {node: '>=20.9.0'}
+    cpu: [arm64]
+    os: [darwin]
+
+  '@img/sharp-darwin-x64@0.35.3':
+    resolution: {integrity: sha512-Xo+5uFBtLN0BKqieTxiFzFPQAUlBbbH5iBKyRX/z1JrbnYsHTfKJnUfL8+p2TPXr1pXqao4eeL4Rl144uDpK9w==}
+    engines: {node: '>=20.9.0'}
+    cpu: [x64]
+    os: [darwin]
+
+  '@img/sharp-freebsd-wasm32@0.35.3':
+    resolution: {integrity: sha512-lUxcqWIj2wMQ9BrwNjngcr1gWUr5xgaGThBRqPPalIC2n67Cqj1uPh8NnA/ZhAg8hUbKl+kVHKwgUIwe6ZYPrg==}
+    engines: {node: '>=20.9.0'}
+    os: [freebsd]
+
+  '@img/sharp-libvips-darwin-arm64@1.3.2':
+    resolution: {integrity: sha512-9J6ypZFpQBj4YnePGoq/S38w6nz+vqg5WZLrLGY4YuSemdMq47GMLBPO42MzwdGwpg/agZ7xzZcFHa48xlywfg==}
+    cpu: [arm64]
+    os: [darwin]
+
+  '@img/sharp-libvips-darwin-x64@1.3.2':
+    resolution: {integrity: sha512-m2pW1n6cns9VaubNwsZ+c3CRYjxNQWgJ5gPlnL1nbBcpkBvFm6SCFN5o0psFHI8w9n11NKhFkeEDns98tiqbEw==}
+    cpu: [x64]
+    os: [darwin]
+
+  '@img/sharp-libvips-linux-arm64@1.3.2':
+    resolution: {integrity: sha512-dqVSFynCox4C/J8kT16V7SIFAns0IjgLwkvYT7p8LQVmJ5OS5b6tI9IGflxTeuBS//zXeFIUbwt5dwxyZ17cnA==}
+    cpu: [arm64]
+    os: [linux]
+    libc: [glibc]
+
+  '@img/sharp-libvips-linux-arm@1.3.2':
+    resolution: {integrity: sha512-1eMLzy92I4J6rmi4mAT8yC3HxOtniyGELlzGbNMLLeqe052ahFQ0h6LFq+lh5DsDIdYViIDst08abvSbcEdLXQ==}
+    cpu: [arm]
+    os: [linux]
+    libc: [glibc]
+
+  '@img/sharp-libvips-linux-ppc64@1.3.2':
+    resolution: {integrity: sha512-3z0NHDxD6n5I9gc05U1eW1AyRm+Gznzq3naMrthPNqE6oYykcogW0l/jfpJdjYnuNl8R7yI9pNbE1XiUeyq0Aw==}
+    cpu: [ppc64]
+    os: [linux]
+    libc: [glibc]
+
+  '@img/sharp-libvips-linux-riscv64@1.3.2':
+    resolution: {integrity: sha512-bsb4rI+NldGOsXuej2r8OdSS8+zXDVaCWxyWrcv6kneTOlgAHtZABRzBBCwdsPiD90J4myNJuHpg6kA20ImW/w==}
+    cpu: [riscv64]
+    os: [linux]
+    libc: [glibc]
+
+  '@img/sharp-libvips-linux-s390x@1.3.2':
+    resolution: {integrity: sha512-/ABshyj8gCpyIrNXnHn4LorDJ0HHm1VhXPBlxZ8zAtfVPAaSafXPGn+sUSIRiwaSBy0mmFjSjiXI5mkcwdChKQ==}
+    cpu: [s390x]
+    os: [linux]
+    libc: [glibc]
+
+  '@img/sharp-libvips-linux-x64@1.3.2':
+    resolution: {integrity: sha512-ITPEtgffGJ0S6G9dRyw/366tJQqFRcHWPHhC+Stpg3Z8AEMrDrTr2lhdz4f/Y/HMbRh//7Z5mBzEpVdi62Oc3w==}
+    cpu: [x64]
+    os: [linux]
+    libc: [glibc]
+
+  '@img/sharp-libvips-linuxmusl-arm64@1.3.2':
+    resolution: {integrity: sha512-zE9EdiUzUmg5mDT5a1rk5fYJ6GWPloTwWBYDS14naqHsL+EaMpDj1AWnpLgh3u0YCORv2Tt50wrcrpYqkP97Kw==}
+    cpu: [arm64]
+    os: [linux]
+    libc: [musl]
+
+  '@img/sharp-libvips-linuxmusl-x64@1.3.2':
+    resolution: {integrity: sha512-m0lrLiUt+lBYnCFr8qV/65yMR4E/c7/wf78I5eKTdkEakFAlZ9QlzEM3QIhhAwVeUhLAHLcCq7a7Vszq/oFNZQ==}
+    cpu: [x64]
+    os: [linux]
+    libc: [musl]
+
+  '@img/sharp-linux-arm64@0.35.3':
+    resolution: {integrity: sha512-QgKDspHPnrU+GQ55XPhGwyhC8acLVOOSyAvo1oVfFmrIXLkDNmGWzAfDZ4xK8oSA1qBQrALcHX0G5UZni/SuFQ==}
+    engines: {node: '>=20.9.0'}
+    cpu: [arm64]
+    os: [linux]
+    libc: [glibc]
+
+  '@img/sharp-linux-arm@0.35.3':
+    resolution: {integrity: sha512-affVWCTLooy8TSxbDx2qkzuDeaWLNVBA+P//FNBirHsXpP2fuBhk5AuboYUnrDnzoXes8GFjpTx0SBFOCRg+FA==}
+    engines: {node: '>=20.9.0'}
+    cpu: [arm]
+    os: [linux]
+    libc: [glibc]
+
+  '@img/sharp-linux-ppc64@0.35.3':
+    resolution: {integrity: sha512-sMd8rDxmpLOwv/7N44klFjOD5DUO7FLdjiXDI0hoxYaf7Ar262dQIEkosE98bps+5HPLtp/EvNqeqQtOycP/IA==}
+    engines: {node: '>=20.9.0'}
+    cpu: [ppc64]
+    os: [linux]
+    libc: [glibc]
+
+  '@img/sharp-linux-riscv64@0.35.3':
+    resolution: {integrity: sha512-0Eob78yjlYPfL5vMNWAW55l3R9Y6BQS/gOfe0ZcP9mEz9ohhKSt4im1hayiknXgf8AWrFqMvJcKIdmLmEe7yeQ==}
+    engines: {node: '>=20.9.0'}
+    cpu: [riscv64]
+    os: [linux]
+    libc: [glibc]
+
+  '@img/sharp-linux-s390x@0.35.3':
+    resolution: {integrity: sha512-KgAxQ0DxpNOq1rG2t5cgTgShJFGSuU7XO45cqC+1NVOuZnP6tlgZRuSYOfNupGkHID0o3cJOsw4DVeJpMovcGw==}
+    engines: {node: '>=20.9.0'}
+    cpu: [s390x]
+    os: [linux]
+    libc: [glibc]
+
+  '@img/sharp-linux-x64@0.35.3':
+    resolution: {integrity: sha512-8pqvxubL2PGdhlPy6GLqzDYMUjyRmKAwKHYKixpdJYBUK7PJ0C029XdsnpFIdgRZG68fZiGdHVWcKPvtiPB4cA==}
+    engines: {node: '>=20.9.0'}
+    cpu: [x64]
+    os: [linux]
+    libc: [glibc]
+
+  '@img/sharp-linuxmusl-arm64@0.35.3':
+    resolution: {integrity: sha512-Vz0iQjzzcSX3HCbfwFfCSG/9SCIqyO0mH2sXyiHaAYfBk0cRsCWXRyQYX0ovCK/PAQBbTzQ0dsPQHh5MAFL59w==}
+    engines: {node: '>=20.9.0'}
+    cpu: [arm64]
+    os: [linux]
+    libc: [musl]
+
+  '@img/sharp-linuxmusl-x64@0.35.3':
+    resolution: {integrity: sha512-6O1NPKcDVj9QEdg7Hx549EX8U0rp6yXQERqru6yRN7fGBn32UvIRJUlWnk+8xDCiG76hXVBbX82NZ/ZKr0euIg==}
+    engines: {node: '>=20.9.0'}
+    cpu: [x64]
+    os: [linux]
+    libc: [musl]
+
+  '@img/sharp-wasm32@0.35.3':
+    resolution: {integrity: sha512-cZ0XkcYGpHZkqW6iCkqTcmUC0CD9DhD5d/qeZlZkfRBn6GnHniZXLUo5+9xw8Iv76YE6LQFN9YNBlKREcCG76w==}
+    engines: {node: '>=20.9.0'}
+
+  '@img/sharp-webcontainers-wasm32@0.35.3':
+    resolution: {integrity: sha512-2rnq7bX3NzeR2T4YWgz8qiG4h3TSdMe+vN1iQXpJleSJ3SM5zQ8Fy2SyyXAWlbxpEZ2Y+Z4u1BePgJEYbSy80Q==}
+    engines: {node: '>=20.9.0'}
+    cpu: [wasm32]
+
+  '@img/sharp-win32-arm64@0.35.3':
+    resolution: {integrity: sha512-4bPwFdMbeC4JQ8L8LOyWp6nsHcboP5fxkp6iPOXz2Vg49R42TuMs2whkJ5OAP4/Ul035qOzy0AecOF9VOscn4w==}
+    engines: {node: '>=20.9.0'}
+    cpu: [arm64]
+    os: [win32]
+
+  '@img/sharp-win32-ia32@0.35.3':
+    resolution: {integrity: sha512-r53mXsBN6lFUDiST764SvgwUdHAqM4rPAiDzAmf4fLoB6X/rkfyTrLCg6+g17wJJiCmB3JYgHuUldCWUIRFSXw==}
+    engines: {node: ^20.9.0}
+    cpu: [ia32]
+    os: [win32]
+
+  '@img/sharp-win32-x64@0.35.3':
+    resolution: {integrity: sha512-D4y1vNeZrIIJCN+uHaWVtH86B+aCrdMYYjicy9pXHvbGZeGYLLSd3wdVuC37FxVXlU1ARsk84eKWfWMXGYEqvA==}
+    engines: {node: '>=20.9.0'}
+    cpu: [x64]
+    os: [win32]
+
   '@jridgewell/sourcemap-codec@1.5.5':
     resolution: {integrity: sha512-cYQ9310grqxueWbl+WuIUIaiUaDcj7WOq5fVhEljNVgRfOUhY9fy2zTvfoqWsnebh8Sl70VScFbICvJnLKB0Og==}
 
@@ -1199,6 +1379,15 @@ packages:
   set-cookie-parser@2.7.2:
     resolution: {integrity: sha512-oeM1lpU/UvhTxw+g3cIfxXHyJRc/uidd3yK1P242gzHds0udQBYzs3y8j4gCCW+ZJ7ad0yctld8RYO+bdurlvw==}
 
+  sharp@0.35.3:
+    resolution: {integrity: sha512-ej0zVHuZGHCiABXcNxeYhpRnPNPAcvbG8RMdBAhDAxLKkCRVSpK3Iyu7qbqw3JMzoj0REeM6f3tJLtVwl0023Q==}
+    engines: {node: '>=20.9.0'}
+    peerDependencies:
+      '@types/node': '*'
+    peerDependenciesMeta:
+      '@types/node':
+        optional: true
+
   siginfo@2.0.0:
     resolution: {integrity: sha512-ybx0WO1/8bSBLEWXZvEd7gMW3Sn3JFlW3TvX1nREbDLRNQNaeNN8WK0meBwPdAaOI7TtRRRJn/Es1zhrrCHu7g==}
 
@@ -1531,6 +1720,112 @@ snapshots:
     transitivePeerDependencies:
       - supports-color
 
+  '@img/colour@1.1.0': {}
+
+  '@img/sharp-darwin-arm64@0.35.3':
+    optionalDependencies:
+      '@img/sharp-libvips-darwin-arm64': 1.3.2
+    optional: true
+
+  '@img/sharp-darwin-x64@0.35.3':
+    optionalDependencies:
+      '@img/sharp-libvips-darwin-x64': 1.3.2
+    optional: true
+
+  '@img/sharp-freebsd-wasm32@0.35.3':
+    dependencies:
+      '@img/sharp-wasm32': 0.35.3
+    optional: true
+
+  '@img/sharp-libvips-darwin-arm64@1.3.2':
+    optional: true
+
+  '@img/sharp-libvips-darwin-x64@1.3.2':
+    optional: true
+
+  '@img/sharp-libvips-linux-arm64@1.3.2':
+    optional: true
+
+  '@img/sharp-libvips-linux-arm@1.3.2':
+    optional: true
+
+  '@img/sharp-libvips-linux-ppc64@1.3.2':
+    optional: true
+
+  '@img/sharp-libvips-linux-riscv64@1.3.2':
+    optional: true
+
+  '@img/sharp-libvips-linux-s390x@1.3.2':
+    optional: true
+
+  '@img/sharp-libvips-linux-x64@1.3.2':
+    optional: true
+
+  '@img/sharp-libvips-linuxmusl-arm64@1.3.2':
+    optional: true
+
+  '@img/sharp-libvips-linuxmusl-x64@1.3.2':
+    optional: true
+
+  '@img/sharp-linux-arm64@0.35.3':
+    optionalDependencies:
+      '@img/sharp-libvips-linux-arm64': 1.3.2
+    optional: true
+
+  '@img/sharp-linux-arm@0.35.3':
+    optionalDependencies:
+      '@img/sharp-libvips-linux-arm': 1.3.2
+    optional: true
+
+  '@img/sharp-linux-ppc64@0.35.3':
+    optionalDependencies:
+      '@img/sharp-libvips-linux-ppc64': 1.3.2
+    optional: true
+
+  '@img/sharp-linux-riscv64@0.35.3':
+    optionalDependencies:
+      '@img/sharp-libvips-linux-riscv64': 1.3.2
+    optional: true
+
+  '@img/sharp-linux-s390x@0.35.3':
+    optionalDependencies:
+      '@img/sharp-libvips-linux-s390x': 1.3.2
+    optional: true
+
+  '@img/sharp-linux-x64@0.35.3':
+    optionalDependencies:
+      '@img/sharp-libvips-linux-x64': 1.3.2
+    optional: true
+
+  '@img/sharp-linuxmusl-arm64@0.35.3':
+    optionalDependencies:
+      '@img/sharp-libvips-linuxmusl-arm64': 1.3.2
+    optional: true
+
+  '@img/sharp-linuxmusl-x64@0.35.3':
+    optionalDependencies:
+      '@img/sharp-libvips-linuxmusl-x64': 1.3.2
+    optional: true
+
+  '@img/sharp-wasm32@0.35.3':
+    dependencies:
+      '@emnapi/runtime': 1.11.1
+    optional: true
+
+  '@img/sharp-webcontainers-wasm32@0.35.3':
+    dependencies:
+      '@img/sharp-wasm32': 0.35.3
+    optional: true
+
+  '@img/sharp-win32-arm64@0.35.3':
+    optional: true
+
+  '@img/sharp-win32-ia32@0.35.3':
+    optional: true
+
+  '@img/sharp-win32-x64@0.35.3':
+    optional: true
+
   '@jridgewell/sourcemap-codec@1.5.5': {}
 
   '@napi-rs/wasm-runtime@1.1.6(@emnapi/core@1.11.1)(@emnapi/runtime@1.11.1)':
@@ -2321,6 +2616,39 @@ snapshots:
 
   set-cookie-parser@2.7.2: {}
 
+  sharp@0.35.3(@types/node@24.13.3):
+    dependencies:
+      '@img/colour': 1.1.0
+      detect-libc: 2.1.2
+      semver: 7.8.5
+    optionalDependencies:
+      '@img/sharp-darwin-arm64': 0.35.3
+      '@img/sharp-darwin-x64': 0.35.3
+      '@img/sharp-freebsd-wasm32': 0.35.3
+      '@img/sharp-libvips-darwin-arm64': 1.3.2
+      '@img/sharp-libvips-darwin-x64': 1.3.2
+      '@img/sharp-libvips-linux-arm': 1.3.2
+      '@img/sharp-libvips-linux-arm64': 1.3.2
+      '@img/sharp-libvips-linux-ppc64': 1.3.2
+      '@img/sharp-libvips-linux-riscv64': 1.3.2
+      '@img/sharp-libvips-linux-s390x': 1.3.2
+      '@img/sharp-libvips-linux-x64': 1.3.2
+      '@img/sharp-libvips-linuxmusl-arm64': 1.3.2
+      '@img/sharp-libvips-linuxmusl-x64': 1.3.2
+      '@img/sharp-linux-arm': 0.35.3
+      '@img/sharp-linux-arm64': 0.35.3
+      '@img/sharp-linux-ppc64': 0.35.3
+      '@img/sharp-linux-riscv64': 0.35.3
+      '@img/sharp-linux-s390x': 0.35.3
+      '@img/sharp-linux-x64': 0.35.3
+      '@img/sharp-linuxmusl-arm64': 0.35.3
+      '@img/sharp-linuxmusl-x64': 0.35.3
+      '@img/sharp-webcontainers-wasm32': 0.35.3
+      '@img/sharp-win32-arm64': 0.35.3
+      '@img/sharp-win32-ia32': 0.35.3
+      '@img/sharp-win32-x64': 0.35.3
+      '@types/node': 24.13.3
+
   siginfo@2.0.0: {}
 
   simple-concat@1.0.1:
diff --git a/scripts/frozen-versions.mjs b/scripts/frozen-versions.mjs
index d1412a2..1af0fca 100644
--- a/scripts/frozen-versions.mjs
+++ b/scripts/frozen-versions.mjs
@@ -26,12 +26,15 @@ export const frozenPackages = {
   },
   "apps/api/package.json": {
     dependencies: {
+      "@dada/asset-release-manifest": "workspace:*",
+      "@dada/static-sticker-catalog": "workspace:*",
       "@fastify/multipart": "10.1.0",
       "@fastify/swagger": "9.8.1",
       "@sinclair/typebox": "0.34.52",
       "better-sqlite3": "13.0.1",
       "drizzle-orm": "0.45.2",
       fastify: "5.10.0",
+      sharp: "0.35.3",
     },
     devDependencies: {
       typescript: "7.0.2",
@@ -46,6 +49,12 @@ export const frozenPackages = {
       typescript: "7.0.2",
     },
   },
+  "packages/asset-release-manifest/package.json": {
+    devDependencies: {
+      "@types/node": "24.13.3",
+      typescript: "7.0.2",
+    },
+  },
   "packages/shared-contracts/package.json": {
     dependencies: {
       "@sinclair/typebox": "0.34.52",
diff --git a/scripts/lib/openapi.mjs b/scripts/lib/openapi.mjs
index 921935e..35965e9 100644
--- a/scripts/lib/openapi.mjs
+++ b/scripts/lib/openapi.mjs
@@ -13,8 +13,7 @@ function runPnpm(args) {
 }
 
 export function buildApiContracts() {
-  runPnpm(["--filter", "@dada/shared-contracts", "build"]);
-  runPnpm(["--filter", "@dada/api", "build"]);
+  runPnpm(["--filter", "@dada/api...", "build"]);
 }
 
 export async function createOpenApiDocument() {
diff --git a/scripts/lib/portable-package.mjs b/scripts/lib/portable-package.mjs
index b99d572..af6d4a0 100644
--- a/scripts/lib/portable-package.mjs
+++ b/scripts/lib/portable-package.mjs
@@ -98,7 +98,11 @@ function copyRuntimeDependencies(sourceRoot, destinationRoot, rootNames) {
     try {
       entry = requireFrom.resolve(name);
     } catch (error) {
-      throw new Error(`Runtime dependency ${name} is unavailable from ${sourceRoot}.`, { cause: error });
+      try {
+        entry = requireFrom.resolve(`${name}/package`);
+      } catch {
+        throw new Error(`Runtime dependency ${name} is unavailable from ${sourceRoot}.`, { cause: error });
+      }
     }
     const root = packageRootFromEntry(entry, name);
     const manifest = json(join(root, "package.json"));
@@ -117,6 +121,14 @@ function copyRuntimeDependencies(sourceRoot, destinationRoot, rootNames) {
     for (const dependency of Object.keys(manifest.dependencies ?? {})) {
       copyResolved(dependency, nestedRequire, join(destination, "node_modules"), nestedAncestors);
     }
+    for (const dependency of Object.keys(manifest.optionalDependencies ?? {})) {
+      try {
+        copyResolved(dependency, nestedRequire, join(destination, "node_modules"), nestedAncestors);
+      } catch (error) {
+        if (error?.cause?.code !== "MODULE_NOT_FOUND") throw error;
+        debug(`skip unavailable optional dependency ${dependency}`);
+      }
+    }
   }
   const rootRequire = createRequire(join(sourceRoot, "package.json"));
   for (const name of rootNames) copyResolved(name, rootRequire, join(destinationRoot, "node_modules"), new Set());
@@ -306,7 +318,7 @@ export async function buildAndValidatePortablePackage({ evidenceDirectory, outpu
 
   const serverRoot = join(packageDirectory, "server");
   debug("copy API application");
-  const apiDependencies = copyApplication(join(repositoryRoot, "apps", "api"), join(serverRoot, "api"), ["@fastify/multipart", "@fastify/swagger", "@sinclair/typebox", "better-sqlite3", "fastify"]);
+  const apiDependencies = copyApplication(join(repositoryRoot, "apps", "api"), join(serverRoot, "api"), ["@fastify/multipart", "@fastify/swagger", "@sinclair/typebox", "better-sqlite3", "fastify", "sharp"]);
   debug("copy Worker application");
   const workerDependencies = copyApplication(join(repositoryRoot, "apps", "worker"), join(serverRoot, "worker"), ["better-sqlite3"]);
   const sharedDestination = join(serverRoot, "api", "node_modules", "@dada", "shared-contracts");
diff --git a/scripts/run-wp5-04-validation.mjs b/scripts/run-wp5-04-validation.mjs
new file mode 100644
index 0000000..bb587ed
--- /dev/null
+++ b/scripts/run-wp5-04-validation.mjs
@@ -0,0 +1,132 @@
+import { createHash } from "node:crypto";
+import { spawnSync } from "node:child_process";
+import { copyFileSync, existsSync, mkdirSync, readFileSync, readdirSync, writeFileSync } from "node:fs";
+import { resolve } from "node:path";
+
+const phaseIndex = process.argv.indexOf("--phase");
+const phase = phaseIndex >= 0 ? process.argv[phaseIndex + 1] : "green";
+if (!["red", "green"].includes(phase)) throw new Error(`Unsupported phase: ${phase}`);
+const runId = process.env.DADA_TDD_RUN_ID ?? `wp5-04-${phase}-${new Date().toISOString().replace(/[^0-9]/g, "")}`;
+const runDirectory = resolve("artifacts", "tdd", runId);
+const casesDirectory = resolve(runDirectory, "cases");
+if (existsSync(runDirectory)) throw new Error(`Evidence run already exists: ${runId}`);
+
+const cases = [
+  {
+    acceptance_criteria: ["AC-42", "AC-48"],
+    evidence: ["response.json", "headers.json", "cache-enumeration.json", "trace.zip"],
+    id: "TDD-WP5-RES-001-three-access-classes",
+    red_reason: "公开 manifest 暴露 internal/private、路径可推导或缓存策略混用",
+    requirements: ["PRIV-02", "PRIV-05"],
+  },
+  {
+    acceptance_criteria: ["AC-46", "AC-48"],
+    evidence: ["cache-enumeration.json", "service-worker.json", "trace.zip"],
+    id: "TDD-WP5-CACHE-001-no-private-client-state",
+    red_reason: "SW 拦截 internal/private 或 IndexedDB 保存私有字段",
+    requirements: ["NFR-07", "PRIV-02"],
+  },
+];
+for (const item of cases) mkdirSync(resolve(casesDirectory, item.id), { recursive: true });
+
+const resourceDirectory = resolve(casesDirectory, cases[0].id);
+const cacheDirectory = resolve(casesDirectory, cases[1].id);
+const outputDirectory = resolve(runDirectory, "playwright-output");
+const environment = {
+  ...process.env,
+  DADA_EVIDENCE_DIR_WP5_CACHE: cacheDirectory,
+  DADA_EVIDENCE_DIR_WP5_RES: resourceDirectory,
+  DADA_PLAYWRIGHT_OUTPUT_DIR: outputDirectory,
+};
+const commands = phase === "red"
+  ? [["red-focused", "pnpm --filter @dada/shared-contracts build && pnpm exec vitest run tests/unit/wp5-04-asset-release-manifest.test.ts tests/api/wp5-04-asset-access.test.ts"]]
+  : [
+    ["build-manifest", "pnpm --filter @dada/asset-release-manifest build"],
+    ["unit", "pnpm test:unit"],
+    ["api", "pnpm test:api"],
+    ["e2e", "pnpm test:e2e"],
+    ["security", "pnpm test:security"],
+    ["package", "pnpm test:package"],
+    ["tdd-trace", "pnpm validate:tdd-trace"],
+  ];
+const commandResults = [];
+for (const [name, command] of commands) {
+  const started_at = new Date().toISOString();
+  const result = spawnSync(process.env.ComSpec ?? "cmd.exe", ["/d", "/s", "/c", command], {
+    encoding: "utf8", env: environment, maxBuffer: 40 * 1024 * 1024,
+  });
+  if (result.stdout) process.stdout.write(result.stdout);
+  if (result.stderr) process.stderr.write(result.stderr);
+  commandResults.push({ command, exit_code: result.status ?? 1, finished_at: new Date().toISOString(), name, started_at });
+  if (phase === "green" && (result.status ?? 1) !== 0) break;
+}
+
+function findFiles(directory, name) {
+  const matches = [];
+  if (!existsSync(directory)) return matches;
+  for (const entry of readdirSync(directory, { withFileTypes: true })) {
+    const path = resolve(directory, entry.name);
+    if (entry.isDirectory()) matches.push(...findFiles(path, name));
+    else if (entry.name === name) matches.push(path);
+  }
+  return matches;
+}
+
+if (phase === "green") {
+  const trace = findFiles(outputDirectory, "trace.zip").find((path) => path.toLowerCase().includes("wp5-04"));
+  if (trace) {
+    copyFileSync(trace, resolve(resourceDirectory, "trace.zip"));
+    copyFileSync(trace, resolve(cacheDirectory, "trace.zip"));
+  }
+}
+
+const redConfirmed = phase === "red" && commandResults.length === 1 && commandResults[0].exit_code !== 0;
+if (phase === "red") {
+  for (const item of cases) {
+    writeFileSync(resolve(casesDirectory, item.id, "red-observation.json"), `${JSON.stringify({
+      expected_failure: item.red_reason,
+      observed_command: commandResults[0].command,
+      observed_exit_code: commandResults[0].exit_code,
+      status: redConfirmed ? "red_confirmed" : "failed",
+    }, null, 2)}\n`);
+  }
+}
+
+const commandState = phase === "red" ? redConfirmed : commandResults.length === commands.length && commandResults.every((result) => result.exit_code === 0);
+const manifest = { path: "tasks.manifest.json", sha256: createHash("sha256").update(readFileSync("tasks.manifest.json")).digest("hex").toUpperCase() };
+const commit = spawnSync("git", ["rev-parse", "--short", "HEAD"], { encoding: "utf8" }).stdout.trim();
+const dirty = spawnSync("git", ["status", "--porcelain"], { encoding: "utf8" }).stdout.trim().length > 0;
+const summaries = [];
+for (const item of cases) {
+  const directory = resolve(casesDirectory, item.id);
+  const evidenceRefs = phase === "red" ? ["red-observation.json"] : item.evidence;
+  const missingEvidence = evidenceRefs.filter((file) => !existsSync(resolve(directory, file)));
+  const status = commandState && missingEvidence.length === 0 ? phase === "red" ? "red_confirmed" : "passed" : "failed";
+  writeFileSync(resolve(directory, "commands.json"), `${JSON.stringify({ commands: commandResults, phase, run_id: runId }, null, 2)}\n`);
+  writeFileSync(resolve(directory, "result.json"), `${JSON.stringify({
+    acceptance_criteria: item.acceptance_criteria,
+    automation: ["automated"],
+    commit,
+    evidence_refs: evidenceRefs,
+    layer: ["UNIT", "API", "E2E", "PKG-SEC"],
+    manifest,
+    missing_evidence: missingEvidence,
+    phase,
+    red_reason: item.red_reason,
+    requirements: item.requirements,
+    run_id: runId,
+    status,
+    task_id: "TASK-WP5-04",
+    test_id: item.id,
+    work_package: "WP-5",
+    worktree_under_test: dirty ? "uncommitted implementation" : "clean committed implementation",
+  }, null, 2)}\n`);
+  summaries.push({ missing_evidence: missingEvidence, status, test_id: item.id });
+}
+const status = summaries.every((item) => item.status === (phase === "red" ? "red_confirmed" : "passed"))
+  ? phase === "red" ? "red_confirmed" : "passed"
+  : "failed";
+writeFileSync(resolve(runDirectory, "commands.json"), `${JSON.stringify({ commands: commandResults, phase, run_id: runId }, null, 2)}\n`);
+writeFileSync(resolve(runDirectory, "evidence.json"), `${JSON.stringify({ cases: summaries, phase, run_id: runId, status }, null, 2)}\n`);
+console.log(JSON.stringify({ cases: summaries, phase, run_id: runId, status }, null, 2));
+if (status === "failed") process.exit(1);
diff --git a/scripts/run-wp5-05-validation.mjs b/scripts/run-wp5-05-validation.mjs
new file mode 100644
index 0000000..cb393bf
--- /dev/null
+++ b/scripts/run-wp5-05-validation.mjs
@@ -0,0 +1,63 @@
+import { createHash } from "node:crypto";
+import { spawnSync } from "node:child_process";
+import { existsSync, mkdirSync, readFileSync, writeFileSync } from "node:fs";
+import { resolve } from "node:path";
+
+const phaseIndex = process.argv.indexOf("--phase");
+const phase = phaseIndex >= 0 ? process.argv[phaseIndex + 1] : "green";
+if (!new Set(["red", "green"]).has(phase)) throw new Error(`Unsupported phase: ${phase}`);
+const runId = process.env.DADA_TDD_RUN_ID ?? `wp5-05-${phase}-${new Date().toISOString().replace(/[^0-9]/g, "")}`;
+const runDirectory = resolve("artifacts", "tdd", runId);
+const caseDirectory = resolve(runDirectory, "cases", "TDD-WP5-UPL-001-upload-metering");
+if (existsSync(runDirectory)) throw new Error(`Evidence run already exists: ${runId}`);
+mkdirSync(caseDirectory, { recursive: true });
+
+const commands = phase === "red"
+  ? [["red-focused", "pnpm --filter @dada/shared-contracts build && pnpm exec vitest run tests/integration/wp5-05-sticker-release.test.ts tests/api/wp5-05-sticker-upload.test.ts"]]
+  : [
+    ["unit", "pnpm test:unit"],
+    ["integration", "pnpm test:integration"],
+    ["api", "pnpm test:api"],
+    ["e2e", "pnpm test:e2e"],
+    ["security", "pnpm test:security"],
+    ["tdd-trace", "pnpm validate:tdd-trace"],
+  ];
+const results = [];
+for (const [name, command] of commands) {
+  const started_at = new Date().toISOString();
+  const result = spawnSync(process.env.ComSpec ?? "cmd.exe", ["/d", "/s", "/c", command], {
+    encoding: "utf8", env: { ...process.env, DADA_EVIDENCE_DIR_WP5_UPL: caseDirectory }, maxBuffer: 40 * 1024 * 1024,
+  });
+  if (result.stdout) process.stdout.write(result.stdout);
+  if (result.stderr) process.stderr.write(result.stderr);
+  results.push({ command, exit_code: result.status ?? 1, finished_at: new Date().toISOString(), name, started_at });
+  if (phase === "green" && (result.status ?? 1) !== 0) break;
+}
+
+const redConfirmed = phase === "red" && results.length === 1 && results[0].exit_code !== 0;
+if (phase === "red") writeFileSync(resolve(caseDirectory, "red-observation.json"), `${JSON.stringify({
+  expected_failure: "后台上传未流式校验、原图/缩略图漏计量或 full 仍写入",
+  observed_command: results[0].command,
+  observed_exit_code: results[0].exit_code,
+  status: redConfirmed ? "red_confirmed" : "failed",
+}, null, 2)}\n`);
+const evidenceRefs = phase === "red" ? ["red-observation.json"] : ["response.json", "db-diff.json", "fs-before.json", "fs-after.json"];
+const missingEvidence = evidenceRefs.filter((name) => !existsSync(resolve(caseDirectory, name)));
+const commandState = phase === "red" ? redConfirmed : results.length === commands.length && results.every((item) => item.exit_code === 0);
+const status = commandState && missingEvidence.length === 0 ? phase === "red" ? "red_confirmed" : "passed" : "failed";
+const manifest = { path: "tasks.manifest.json", sha256: createHash("sha256").update(readFileSync("tasks.manifest.json")).digest("hex").toUpperCase() };
+const commit = spawnSync("git", ["rev-parse", "--short", "HEAD"], { encoding: "utf8" }).stdout.trim();
+const dirty = spawnSync("git", ["status", "--porcelain"], { encoding: "utf8" }).stdout.trim().length > 0;
+writeFileSync(resolve(caseDirectory, "commands.json"), `${JSON.stringify({ commands: results, phase, run_id: runId }, null, 2)}\n`);
+writeFileSync(resolve(caseDirectory, "result.json"), `${JSON.stringify({
+  acceptance_criteria: ["AC-31", "AC-55"], automation: ["automated"], commit,
+  evidence_refs: evidenceRefs, layer: ["INTEGRATION", "API", "E2E", "PKG-SEC"], manifest,
+  missing_evidence: missingEvidence, phase, red_reason: "后台上传未流式校验、原图/缩略图漏计量或 full 仍写入",
+  requirements: ["ADMIN-06"], run_id: runId, status, task_id: "TASK-WP5-05",
+  test_id: "TDD-WP5-UPL-001-upload-metering", work_package: "WP-5",
+  worktree_under_test: dirty ? "uncommitted implementation" : "clean committed implementation",
+}, null, 2)}\n`);
+writeFileSync(resolve(runDirectory, "commands.json"), `${JSON.stringify({ commands: results, phase, run_id: runId }, null, 2)}\n`);
+writeFileSync(resolve(runDirectory, "evidence.json"), `${JSON.stringify({ cases: [{ missing_evidence: missingEvidence, status, test_id: "TDD-WP5-UPL-001-upload-metering" }], phase, run_id: runId, status }, null, 2)}\n`);
+console.log(JSON.stringify({ phase, run_id: runId, status }, null, 2));
+if (status === "failed") process.exit(1);
diff --git a/tests/api/wp5-04-asset-access.test.ts b/tests/api/wp5-04-asset-access.test.ts
new file mode 100644
index 0000000..0413778
--- /dev/null
+++ b/tests/api/wp5-04-asset-access.test.ts
@@ -0,0 +1,150 @@
+import { randomUUID } from "node:crypto";
+import { mkdirSync, mkdtempSync, rmSync, writeFileSync } from "node:fs";
+import { tmpdir } from "node:os";
+import { join, resolve } from "node:path";
+
+import { afterEach, describe, expect, it } from "vitest";
+
+import { createApp } from "../../apps/api/src/app.js";
+import { RegistrationService } from "../../apps/api/src/registration.js";
+import { MockResendAdapter } from "../../apps/api/src/resend-adapter.js";
+import { createAssetReleaseManifest } from "../../packages/asset-release-manifest/src/index.js";
+
+const now = Date.parse("2026-08-03T10:00:00.000Z");
+const releaseVersion = "asset-20260803.1";
+const publicId = "7f0c9530-a7d9-4bf1-8c65-0e9298dd04ac";
+const previewId = "ab18fd72-60e1-44e3-a9a0-3dfccb12e17c";
+const ungrantedPreviewId = "d8fe890d-6df4-46a9-a578-96c1f8361ac0";
+const privateId = "e3792605-5252-4d3b-a101-827408ab3515";
+const headers = { host: "127.0.0.1:43121", origin: "http://127.0.0.1:43121" };
+const roots: string[] = [];
+const registrations: RegistrationService[] = [];
+
+function addUser(registration: RegistrationService, role: "super_admin" | "user") {
+  const userId = randomUUID();
+  registration.database.prepare(`INSERT INTO users (
+    user_id, normalized_email, role, status, counts_toward_stage_limit, registration_id, created_at
+  ) VALUES (?, ?, ?, 'active', ?, ?, ?)`).run(
+    userId,
+    `${role}-${userId}@example.invalid`,
+    role,
+    role === "user" ? 1 : 0,
+    randomUUID(),
+    now,
+  );
+  if (role === "user") {
+    registration.database.prepare("INSERT INTO user_profiles (user_id, creator_name, social_id) VALUES (?, 'Asset User', '@asset_user')").run(userId);
+    registration.database.prepare("INSERT INTO credit_accounts (user_id, available_balance, reserved_balance, updated_at) VALUES (?, 10, 0, ?)").run(userId, now);
+  } else {
+    registration.database.prepare("INSERT INTO admin_access (user_id, allowed) VALUES (?, 1)").run(userId);
+  }
+  return { session: registration.issueAuthenticatedSession(userId, role === "user" ? "user" : "admin"), userId };
+}
+
+function evidence(name: string, value: unknown) {
+  const directory = process.env.DADA_EVIDENCE_DIR_WP5_RES;
+  if (!directory) return;
+  mkdirSync(directory, { recursive: true });
+  writeFileSync(resolve(directory, name), `${JSON.stringify(value, null, 2)}\n`);
+}
+
+function harness() {
+  const root = mkdtempSync(join(tmpdir(), "dada-wp5-04-api-"));
+  roots.push(root);
+  const registration = new RegistrationService({
+    challengePepper: Buffer.alloc(32, 0x31), clock: () => now,
+    currentPrivacyNoticeVersion: "p0a-registration-notice-v1", databasePath: join(root, "dada.sqlite3"),
+    invitePepper: Buffer.alloc(32, 0x32), resend: new MockResendAdapter(), sessionPepper: Buffer.alloc(32, 0x33),
+  });
+  registrations.push(registration);
+  const owner = addUser(registration, "user");
+  const intruder = addUser(registration, "user");
+  const admin = addUser(registration, "super_admin");
+  const assetReleases = createAssetReleaseManifest({
+    items: [
+      { access_class: "public_release_asset", cache_kind: "thumbnail", content: Buffer.from("public"), mime_type: "image/png", relative_path: "public/FLOWER001.png", resource_id: publicId, root_ref: "canonical-assets" },
+      { access_class: "internal_preview_asset", content: Buffer.from("preview"), mime_type: "image/webp", relative_path: "preview/FLOWER009.webp", resource_id: previewId, root_ref: "canonical-assets" },
+      { access_class: "internal_preview_asset", content: Buffer.from("ungranted-preview"), mime_type: "image/webp", relative_path: "preview/FLOWER010.webp", resource_id: ungrantedPreviewId, root_ref: "canonical-assets" },
+      { access_class: "private_user_asset", content: Buffer.from("private"), mime_type: "image/png", owner_id: owner.userId, relative_path: "private/generated.png", resource_id: privateId, root_ref: "managed-assets" },
+    ],
+    release_version: releaseVersion,
+  });
+  let previewGranted = true;
+  let previewChecks = 0;
+  const appPromise = createApp({
+    assetReleases,
+    browserGate: false,
+    networkBoundary: { allowTestPort: true },
+    previewAssetAuthorizer: ({ resourceId, userId }) => {
+      previewChecks += 1;
+      return previewGranted && userId === owner.userId && resourceId === previewId;
+    },
+    privateAssetAdminAuthorizer: ({ adminUserId, ownerId }) => adminUserId === admin.userId && ownerId === owner.userId,
+    registration,
+  });
+  return { admin, appPromise, intruder, owner, previewChecks: () => previewChecks, revokePreview: () => { previewGranted = false; } };
+}
+
+afterEach(() => {
+  for (const registration of registrations.splice(0)) registration.close();
+  for (const root of roots.splice(0)) rmSync(root, { force: true, recursive: true });
+});
+
+describe("TDD-WP5-RES-001 three access classes", () => {
+  it("separates route projections, per-request authorization, and cache headers", async () => {
+    const test = harness();
+    const app = await test.appPromise;
+    const ownerCookie = `dada_session=${test.owner.session.sessionToken}`;
+    const intruderCookie = `dada_session=${test.intruder.session.sessionToken}`;
+    const adminCookie = `dada_admin_session=${test.admin.session.sessionToken}`;
+
+    const publicManifest = await app.inject({ headers, method: "GET", url: `/api/v1/assets/public/${releaseVersion}/manifest` });
+    const publicAsset = await app.inject({ headers, method: "GET", url: `/api/v1/assets/public/${releaseVersion}/${publicId}` });
+    const previewManifest = await app.inject({ headers: { ...headers, cookie: ownerCookie }, method: "GET", url: `/api/v1/assets/preview/${releaseVersion}/manifest` });
+    const previewAsset = await app.inject({ headers: { ...headers, cookie: ownerCookie }, method: "GET", url: `/api/v1/assets/preview/${releaseVersion}/${previewId}` });
+    const privateManifest = await app.inject({ headers: { ...headers, cookie: ownerCookie }, method: "GET", url: `/api/v1/private-assets/${releaseVersion}/manifest` });
+    const privateAsset = await app.inject({ headers: { ...headers, cookie: ownerCookie }, method: "GET", url: `/api/v1/private-assets/${releaseVersion}/${privateId}` });
+    const deniedPrivate = await app.inject({ headers: { ...headers, cookie: intruderCookie }, method: "GET", url: `/api/v1/private-assets/${releaseVersion}/${privateId}` });
+    const controlledAdmin = await app.inject({ headers: { ...headers, cookie: adminCookie }, method: "GET", url: `/api/v1/private-assets/${releaseVersion}/${privateId}` });
+
+    expect(publicManifest.statusCode).toBe(200);
+    expect(publicManifest.headers["cache-control"]).toBe("public, max-age=31536000, immutable");
+    expect(publicManifest.json().items).toEqual([expect.objectContaining({ access_class: "public_release_asset", resource_id: publicId })]);
+    expect(JSON.stringify(publicManifest.json())).not.toMatch(/preview|private|relative_path|root_ref|[A-Z]:\\\\/i);
+    expect(publicAsset.statusCode).toBe(200);
+    expect(publicAsset.rawPayload).toEqual(Buffer.from("public"));
+    expect(publicAsset.headers["cache-control"]).toBe("public, max-age=31536000, immutable");
+
+    expect(previewManifest.statusCode).toBe(200);
+    expect(previewManifest.headers["cache-control"]).toBe("private, no-store");
+    expect(previewManifest.json().items).toEqual([expect.objectContaining({ resource_id: previewId })]);
+    expect(JSON.stringify(previewManifest.json())).not.toContain(ungrantedPreviewId);
+    expect(previewAsset.statusCode).toBe(200);
+    expect(previewAsset.headers["cache-control"]).toBe("private, no-store");
+    expect(privateManifest.json().items).toEqual([expect.objectContaining({ access_class: "private_user_asset", resource_id: privateId })]);
+    expect(privateAsset.rawPayload).toEqual(Buffer.from("private"));
+    expect(privateAsset.headers["cache-control"]).toBe("private, no-store");
+    expect(deniedPrivate.statusCode).toBe(404);
+    expect(controlledAdmin.statusCode).toBe(200);
+
+    const publicGuess = await app.inject({ headers, method: "GET", url: `/api/v1/assets/public/${releaseVersion}/${privateId}` });
+    expect(publicGuess.statusCode).toBe(404);
+    test.revokePreview();
+    const revoked = await app.inject({ headers: { ...headers, cookie: ownerCookie }, method: "GET", url: `/api/v1/assets/preview/${releaseVersion}/${previewId}` });
+    expect(revoked.statusCode).toBe(404);
+    expect(test.previewChecks()).toBe(4);
+
+    evidence("response.json", {
+      controlled_admin_status: controlledAdmin.statusCode,
+      private_intruder_status: deniedPrivate.statusCode,
+      public_guess_status: publicGuess.statusCode,
+      revoked_preview_status: revoked.statusCode,
+    });
+    evidence("headers.json", {
+      private: privateAsset.headers["cache-control"],
+      preview: previewAsset.headers["cache-control"],
+      public: publicAsset.headers["cache-control"],
+    });
+    await app.close();
+  });
+});
diff --git a/tests/api/wp5-05-sticker-upload.test.ts b/tests/api/wp5-05-sticker-upload.test.ts
new file mode 100644
index 0000000..057d96a
--- /dev/null
+++ b/tests/api/wp5-05-sticker-upload.test.ts
@@ -0,0 +1,109 @@
+import { createHash, randomUUID } from "node:crypto";
+import { mkdirSync, mkdtempSync, rmSync, writeFileSync } from "node:fs";
+import { tmpdir } from "node:os";
+import { join, resolve } from "node:path";
+
+import { afterEach, describe, expect, it } from "vitest";
+
+import { createApp } from "../../apps/api/src/app.js";
+import { ManagedStorage } from "../../apps/api/src/managed-storage.js";
+import { RegistrationService } from "../../apps/api/src/registration.js";
+import { MockResendAdapter } from "../../apps/api/src/resend-adapter.js";
+import { StickerReleaseService } from "../../apps/api/src/sticker-releases.js";
+
+const now = Date.parse("2026-08-03T12:00:00.000Z");
+const png = Buffer.from("iVBORw0KGgoAAAANSUhEUgAAAAQAAAADCAYAAAC09K7GAAAACXBIWXMAAAPoAAAD6AG1e1JrAAAAEklEQVQImWO4E6XxHxkzEBQAANIxHF3ECQOzAAAAAElFTkSuQmCC", "base64");
+const roots: string[] = [];
+const closeables: Array<{ close(): void }> = [];
+const baseHeaders = { host: "127.0.0.1:43121", origin: "http://127.0.0.1:43121" };
+
+async function multipart() {
+  const form = new FormData();
+  form.append("stable_id", "STK1408");
+  form.append("part", "25");
+  form.append("order", "184");
+  form.append("enabled", "true");
+  form.append("original_byte_size", String(png.byteLength));
+  form.append("original_sha256", createHash("sha256").update(png).digest("hex"));
+  form.append("sticker_file", new Blob([png], { type: "image/png" }), "STK1408.png");
+  const serialized = new Response(form);
+  return { contentType: serialized.headers.get("content-type")!, payload: Buffer.from(await serialized.arrayBuffer()) };
+}
+
+function evidence(value: unknown) {
+  const directory = process.env.DADA_EVIDENCE_DIR_WP5_UPL;
+  if (!directory) return;
+  mkdirSync(directory, { recursive: true });
+  writeFileSync(resolve(directory, "response.json"), `${JSON.stringify(value, null, 2)}\n`);
+}
+
+afterEach(() => {
+  for (const value of closeables.splice(0).reverse()) value.close();
+  for (const root of roots.splice(0)) rmSync(root, { force: true, recursive: true });
+});
+
+describe("TASK-WP5-05 admin sticker API", () => {
+  it("requires admin mutation controls, publishes upload, and exposes current and versioned public resources", async () => {
+    const dataRoot = mkdtempSync(join(tmpdir(), "dada-wp5-05-api-"));
+    roots.push(dataRoot);
+    mkdirSync(join(dataRoot, "db"), { recursive: true });
+    const databasePath = join(dataRoot, "db", "dada.sqlite3");
+    const registration = new RegistrationService({
+      challengePepper: Buffer.alloc(32, 0x41), clock: () => now,
+      currentPrivacyNoticeVersion: "p0a-registration-notice-v1", databasePath,
+      invitePepper: Buffer.alloc(32, 0x42), resend: new MockResendAdapter(), sessionPepper: Buffer.alloc(32, 0x43),
+    });
+    const storage = new ManagedStorage({ dataRoot, databasePath });
+    const stickers = new StickerReleaseService({ clock: () => now, databasePath, storage });
+    closeables.push(stickers, storage, registration);
+    const adminId = randomUUID();
+    registration.database.prepare(`INSERT INTO users (
+      user_id, normalized_email, role, status, counts_toward_stage_limit, registration_id, created_at
+    ) VALUES (?, 'sticker-admin@example.invalid', 'super_admin', 'active', 0, ?, ?)`).run(adminId, randomUUID(), now);
+    registration.database.prepare("INSERT INTO admin_access (user_id, allowed) VALUES (?, 1)").run(adminId);
+    const session = registration.issueAuthenticatedSession(adminId, "admin");
+    const csrf = registration.issueAdminCsrfToken(session.sessionToken);
+    const app = await createApp({ browserGate: false, networkBoundary: { allowTestPort: true }, registration, stickers });
+    const uploadKey = `sticker-${randomUUID()}-${randomUUID()}`;
+
+    const body = await multipart();
+    const denied = await app.inject({ headers: { ...baseHeaders, "content-type": body.contentType }, method: "POST", payload: body.payload, url: "/api/v1/admin/assets/static-stickers" });
+    expect(denied.statusCode).toBe(401);
+
+    const acceptedBody = await multipart();
+    const accepted = await app.inject({
+      headers: {
+        ...baseHeaders, cookie: `dada_admin_session=${session.sessionToken}`, "content-type": acceptedBody.contentType,
+        "idempotency-key": uploadKey, "x-csrf-token": csrf,
+      },
+      method: "POST", payload: acceptedBody.payload, url: "/api/v1/admin/assets/static-stickers",
+    });
+    expect(accepted.statusCode).toBe(201);
+    expect(accepted.json()).toMatchObject({ item: { stable_id: "STK1408" }, release_version: "asset-20260803.1" });
+    const replayBody = await multipart();
+    const replay = await app.inject({
+      headers: {
+        ...baseHeaders, cookie: `dada_admin_session=${session.sessionToken}`, "content-type": replayBody.contentType,
+        "idempotency-key": uploadKey, "x-csrf-token": csrf,
+      },
+      method: "POST", payload: replayBody.payload, url: "/api/v1/admin/assets/static-stickers",
+    });
+    expect(replay.statusCode).toBe(200);
+    expect(replay.json()).toMatchObject({ created: false, release_version: "asset-20260803.1" });
+    expect(storage.inspectCounts()).toMatchObject({ managed_files: 2 });
+
+    const adminList = await app.inject({ headers: { ...baseHeaders, cookie: `dada_admin_session=${session.sessionToken}` }, method: "GET", url: "/api/v1/admin/assets/static-stickers" });
+    const publicList = await app.inject({ headers: baseHeaders, method: "GET", url: "/api/v1/static-stickers/current" });
+    const original = await app.inject({ headers: baseHeaders, method: "GET", url: "/api/v1/assets/public/asset-20260803.1/STK1408" });
+    const thumbnail = await app.inject({ headers: baseHeaders, method: "GET", url: "/api/v1/assets/public/asset-20260803.1/STK1408?variant=thumbnail" });
+    expect(adminList.statusCode).toBe(200);
+    expect(publicList.json()).toMatchObject({ count: 1, items: [{ stable_id: "STK1408" }] });
+    expect(original.rawPayload).toEqual(png);
+    expect(thumbnail.statusCode).toBe(200);
+    expect(thumbnail.headers["content-type"]).toMatch(/^image\/png/);
+    expect(thumbnail.rawPayload).not.toEqual(png);
+
+    evidence({ admin_list_status: adminList.statusCode, public_count: publicList.json().count, upload_status: accepted.statusCode });
+    await app.close();
+  });
+});
diff --git a/tests/e2e/wp5-04-resource-isolation.spec.ts b/tests/e2e/wp5-04-resource-isolation.spec.ts
new file mode 100644
index 0000000..2373e18
--- /dev/null
+++ b/tests/e2e/wp5-04-resource-isolation.spec.ts
@@ -0,0 +1,149 @@
+import { mkdirSync, writeFileSync } from "node:fs";
+import { resolve } from "node:path";
+
+import { expect, test } from "@playwright/test";
+import { createServer, type ViteDevServer } from "vite";
+
+const releaseVersion = "asset-20260803.1";
+const publicId = "7f0c9530-a7d9-4bf1-8c65-0e9298dd04ac";
+const previewId = "ab18fd72-60e1-44e3-a9a0-3dfccb12e17c";
+const privateId = "e3792605-5252-4d3b-a101-827408ab3515";
+let vite: ViteDevServer;
+let webUrl: string;
+const requestCounts = { preview: 0, private: 0, public: 0 };
+
+function writeEvidence(directory: string | undefined, name: string, value: unknown) {
+  if (!directory) return;
+  mkdirSync(directory, { recursive: true });
+  writeFileSync(resolve(directory, name), `${JSON.stringify(value, null, 2)}\n`);
+}
+
+test.beforeAll(async () => {
+  vite = await createServer({
+    configFile: false,
+    plugins: [{
+      name: "wp5-04-three-resource-classes",
+      configureServer(server) {
+        server.middlewares.use((request, response, next) => {
+          const routes = [
+            { access: "public", body: "public-content", id: publicId, prefix: "/api/v1/assets/public/" },
+            { access: "preview", body: "preview-content", id: previewId, prefix: "/api/v1/assets/preview/" },
+            { access: "private", body: "private-content", id: privateId, prefix: "/api/v1/private-assets/" },
+          ] as const;
+          const route = routes.find((item) => request.url === `${item.prefix}${releaseVersion}/${item.id}`);
+          if (!route) return next();
+          requestCounts[route.access] += 1;
+          response.statusCode = 200;
+          response.setHeader("Cache-Control", route.access === "public" ? "public, max-age=31536000, immutable" : "private, no-store");
+          response.setHeader("Content-Type", "application/octet-stream");
+          response.end(route.body);
+        });
+      },
+    }],
+    publicDir: resolve("apps/web/public"),
+    root: process.cwd(),
+    server: { host: "127.0.0.1", port: 0 },
+  });
+  await vite.listen();
+  const address = vite.httpServer?.address();
+  if (!address || typeof address === "string") throw new Error("Vite did not expose a test port.");
+  webUrl = `http://127.0.0.1:${address.port}`;
+});
+
+test.afterAll(async () => vite.close());
+
+test("TDD-WP5-04 enumerates no preview or private client state", async ({ context, page }) => {
+  requestCounts.preview = 0;
+  requestCounts.private = 0;
+  requestCounts.public = 0;
+  await page.goto(`${webUrl}/tests/e2e/fixtures/public-asset-cache.html`);
+  await expect(page.locator("#status")).toHaveText("ready");
+  await page.reload();
+  await expect(page.locator("#status")).toHaveText("ready");
+
+  const online = await page.evaluate(async ({ privateId, previewId, publicId, releaseVersion }) => {
+    const cache = window.dadaCacheProbe.cache;
+    await cache.clear();
+    const cached = await cache.cache({
+      access_class: "public_release_asset",
+      cache_kind: "thumbnail",
+      release_version: releaseVersion,
+      resource_id: publicId,
+    });
+    const rejected = await Promise.all([
+      cache.cache({ access_class: "internal_preview_asset", cache_kind: "thumbnail", release_version: releaseVersion, resource_id: previewId }),
+      cache.cache({ access_class: "private_user_asset", cache_kind: "thumbnail", release_version: releaseVersion, resource_id: privateId }),
+    ]);
+    const preview = await fetch(`/api/v1/assets/preview/${releaseVersion}/${previewId}`);
+    const privateAsset = await fetch(`/api/v1/private-assets/${releaseVersion}/${privateId}`);
+    const inspection = await cache.inspect();
+    const registrations = await navigator.serviceWorker.getRegistrations();
+    const databases = await indexedDB.databases();
+    return {
+      cached,
+      inspection,
+      private_bytes: (await privateAsset.arrayBuffer()).byteLength,
+      private_cache_control: privateAsset.headers.get("cache-control"),
+      preview_bytes: (await preview.arrayBuffer()).byteLength,
+      preview_cache_control: preview.headers.get("cache-control"),
+      rejected,
+      service_workers: registrations.map((registration) => ({
+        active: registration.active?.state,
+        scope: registration.scope,
+        script_url: registration.active?.scriptURL,
+      })),
+      indexed_db_names: databases.map((database) => database.name).filter(Boolean).sort(),
+      local_storage_keys: Object.keys(localStorage),
+      session_storage_keys: Object.keys(sessionStorage),
+    };
+  }, { privateId, previewId, publicId, releaseVersion });
+
+  await context.setOffline(true);
+  const offline = await page.evaluate(async ({ privateId, previewId, publicId, releaseVersion }) => {
+    const read = async (url: string) => {
+      try {
+        const response = await fetch(url);
+        return { body: await response.text(), status: response.status };
+      } catch {
+        return { body: null, status: "network_error" };
+      }
+    };
+    return {
+      preview: await read(`/api/v1/assets/preview/${releaseVersion}/${previewId}`),
+      private: await read(`/api/v1/private-assets/${releaseVersion}/${privateId}`),
+      public: await read(`/api/v1/assets/public/${releaseVersion}/${publicId}`),
+    };
+  }, { privateId, previewId, publicId, releaseVersion });
+  await context.setOffline(false);
+
+  expect(online.cached.status).toBe("cached");
+  expect(online.rejected).toEqual([
+    { status: "rejected_not_allowlisted" },
+    { status: "rejected_not_allowlisted" },
+  ]);
+  expect(online.preview_cache_control).toBe("private, no-store");
+  expect(online.private_cache_control).toBe("private, no-store");
+  expect(online.inspection.cache_keys).toHaveLength(1);
+  expect(online.inspection.cache_names).toEqual(["dada-public-assets-v1"]);
+  expect(online.inspection.entries).toEqual([expect.objectContaining({ resource_id: publicId })]);
+  expect(JSON.stringify(online.inspection)).not.toContain(previewId);
+  expect(JSON.stringify(online.inspection)).not.toContain(privateId);
+  expect(online.indexed_db_names).toEqual(["dada-public-asset-cache-v1"]);
+  expect(online.local_storage_keys).toEqual([]);
+  expect(online.session_storage_keys).toEqual([]);
+  expect(online.service_workers).toHaveLength(1);
+  expect(offline.public).toEqual({ body: "public-content", status: 200 });
+  expect(offline.preview.status).toBe("network_error");
+  expect(offline.private.status).toBe("network_error");
+  expect(requestCounts).toEqual({ preview: 1, private: 1, public: 1 });
+
+  const cacheEnumeration = {
+    business_database_calls: 0,
+    offline,
+    online,
+    origin_request_counts: { ...requestCounts },
+  };
+  writeEvidence(process.env.DADA_EVIDENCE_DIR_WP5_CACHE, "cache-enumeration.json", cacheEnumeration);
+  writeEvidence(process.env.DADA_EVIDENCE_DIR_WP5_CACHE, "service-worker.json", { registrations: online.service_workers });
+  writeEvidence(process.env.DADA_EVIDENCE_DIR_WP5_RES, "cache-enumeration.json", cacheEnumeration);
+});
diff --git a/tests/e2e/wp5-05-admin-assets.spec.ts b/tests/e2e/wp5-05-admin-assets.spec.ts
new file mode 100644
index 0000000..3d26b4a
--- /dev/null
+++ b/tests/e2e/wp5-05-admin-assets.spec.ts
@@ -0,0 +1,131 @@
+import { mkdirSync } from "node:fs";
+import { resolve } from "node:path";
+
+import { expect, test, type Page } from "@playwright/test";
+import { createServer, type ViteDevServer } from "vite";
+
+let vite: ViteDevServer;
+let webUrl: string;
+const png = Buffer.from("iVBORw0KGgoAAAANSUhEUgAAAAQAAAADCAYAAAC09K7GAAAACXBIWXMAAAPoAAAD6AG1e1JrAAAAEklEQVQImWO4E6XxHxkzEBQAANIxHF3ECQOzAAAAAElFTkSuQmCC", "base64");
+const adminSession = { csrf_token: "csrf-wp5-05-admin-000000000000000000000000000000000" };
+const projectId = "00000000-0000-4000-8000-000000001405";
+const userSession = {
+  audience: "user", authenticated: true, credits: { available_balance: 10, reserved_balance: 0 },
+  csrf_token: "csrf-wp5-05-user-0000000000000000000000000000000000",
+  expires_at: "2026-09-03T12:00:00.000Z",
+  user: { creator_name: "Sticker User", role: "user", social_id: "@sticker", status: "active", user_id: projectId },
+};
+
+function asset(stableId = "STK1408") {
+  return {
+    enabled: true, file_state: "committed", height: 3, mime: "image/png", mime_type: "image/png", order: 184,
+    original_byte_size: png.byteLength, original_filename: `${stableId}.png`, original_reference: `/api/v1/assets/public/asset-20260803.1/${stableId}`,
+    origin: "admin_uploaded", part: 25, relative_path: `managed-assets/stickers/original/${stableId}.png`, resource_version: "asset-20260803.1",
+    sha256: "0".repeat(64), stable_id: stableId, thumbnail_byte_size: 75,
+    thumbnail_reference: { media: "thumbnail", resource_id: stableId, resource_version: "asset-20260803.1", url: `/api/v1/assets/public/asset-20260803.1/${stableId}?variant=thumbnail` }, width: 4,
+  };
+}
+
+function assetsResponse(status: "active" | "full" | "unavailable" = "active", items = [asset()]) {
+  return {
+    count: items.length, items, release_version: items.length ? "asset-20260803.1" : null,
+    storage: { capacity_notice_level: status === "active" ? "normal" : "critical", hard_limit_bytes: 5_368_709_120, managed_content_bytes: status === "full" ? 5_368_709_120 : 150, storage_status: status },
+  };
+}
+
+test.beforeAll(async () => {
+  vite = await createServer({ configFile: resolve("apps/web/vite.config.ts"), root: resolve("apps/web"), server: { host: "127.0.0.1", port: 0 } });
+  await vite.listen();
+  const address = vite.httpServer?.address();
+  if (!address || typeof address === "string") throw new Error("Vite did not expose a test port.");
+  webUrl = `http://127.0.0.1:${address.port}`;
+});
+
+test.afterAll(async () => vite.close());
+
+async function routeAdminSession(page: Page) {
+  await page.route("**/api/v1/admin-auth/session", (route) => route.fulfill({ body: JSON.stringify(adminSession), contentType: "application/json", status: 200 }));
+  await page.route("**/api/v1/assets/public/**", (route) => route.fulfill({ body: png, contentType: "image/png", status: 200 }));
+}
+
+test("TDD-WP5-UPL-001-upload-metering uploads and publishes with stable metadata controls", async ({ page }) => {
+  await routeAdminSession(page);
+  let uploaded = false;
+  let multipartBody = "";
+  await page.route("**/api/v1/admin/assets/static-stickers", async (route) => {
+    if (route.request().method() === "POST") {
+      multipartBody = route.request().postDataBuffer()?.toString("latin1") ?? "";
+      uploaded = true;
+      return route.fulfill({ body: JSON.stringify({ created: true, item: asset(), release_version: "asset-20260803.1" }), contentType: "application/json", status: 201 });
+    }
+    return route.fulfill({ body: JSON.stringify(assetsResponse("active", uploaded ? [asset()] : [])), contentType: "application/json", status: 200 });
+  });
+
+  await page.goto(`${webUrl}/admin/assets`);
+  await expect(page.getByRole("heading", { name: "普通贴纸" })).toBeVisible();
+  await expect(page.getByText("当前没有后台上传的普通贴纸。")).toBeVisible();
+  await page.getByLabel("贴纸文件").setInputFiles({ buffer: png, mimeType: "image/png", name: "STK1408.png" });
+  await page.getByRole("button", { name: "上传并发布" }).click();
+  await expect(page.getByRole("rowheader", { name: /STK1408/ })).toBeVisible();
+  expect(multipartBody).toContain("STK1408");
+  expect(multipartBody).toContain("image/png");
+  expect(multipartBody).toContain("original_sha256");
+  const evidenceRoot = process.env.DADA_EVIDENCE_DIR_WP5_UPL;
+  if (evidenceRoot) {
+    const directory = resolve(evidenceRoot, "screenshots");
+    mkdirSync(directory, { recursive: true });
+    await page.screenshot({ fullPage: true, path: resolve(directory, "admin-assets-uploaded.png") });
+  }
+});
+
+test("storage full disables every upload control and load failure exposes retry", async ({ page }) => {
+  await page.setViewportSize({ height: 844, width: 390 });
+  await routeAdminSession(page);
+  await page.route("**/api/v1/admin/assets/static-stickers", (route) => route.fulfill({ body: JSON.stringify(assetsResponse("full")), contentType: "application/json", status: 200 }));
+  await page.goto(`${webUrl}/admin/assets`);
+  await expect(page.getByText("当前存储状态禁止新增原图和缩略图。")).toBeVisible();
+  await expect(page.getByLabel("贴纸文件")).toBeDisabled();
+  await expect(page.getByRole("button", { name: "上传并发布" })).toBeDisabled();
+  const evidenceRoot = process.env.DADA_EVIDENCE_DIR_WP5_UPL;
+  if (evidenceRoot) {
+    const directory = resolve(evidenceRoot, "screenshots");
+    mkdirSync(directory, { recursive: true });
+    await page.screenshot({ fullPage: true, path: resolve(directory, "admin-assets-full-mobile.png") });
+  }
+
+  await page.unroute("**/api/v1/admin/assets/static-stickers");
+  await page.route("**/api/v1/admin/assets/static-stickers", (route) => route.fulfill({ status: 503 }));
+  await page.reload();
+  await expect(page.getByRole("alert")).toContainText("素材状态暂时无法读取");
+  await expect(page.getByRole("button", { name: "重试" })).toBeVisible();
+});
+
+test("the editor merges the current uploaded release and saves its resource version", async ({ page }) => {
+  let savedResourceVersion = "";
+  let originalRequests = 0;
+  await page.route("**/api/v1/auth/session", (route) => route.fulfill({ body: JSON.stringify(userSession), contentType: "application/json", status: 200 }));
+  await page.route("**/api/v1/static-stickers/current", (route) => route.fulfill({ body: JSON.stringify({ count: 1, items: [asset()], release_version: "asset-20260803.1" }), contentType: "application/json", status: 200 }));
+  await page.route(`**/api/v1/projects/${projectId}`, (route) => route.fulfill({ body: JSON.stringify({
+    canvas_state: { background: { adjustments: { brightness: 0, contrast: 0, crop: null, filter: "none", fit: "fill", saturation: 0, sharpness: 0, temperature: 0 }, asset_id: null }, elements: [], pixel_height: 1440, pixel_width: 1080, ratio: "3:4", schema_version: 1 },
+    created_at: "2026-08-03T12:00:00.000Z", current_image_id: null, images: [], name: "上传贴纸", project_id: projectId, ratio: "3:4", state_version: 1,
+  }), contentType: "application/json", status: 200 }));
+  await page.route(`**/api/v1/projects/${projectId}/state`, async (route) => {
+    const body = route.request().postDataJSON() as { canvas_state: { elements: Array<{ resource_version: string }> } };
+    savedResourceVersion = body.canvas_state.elements[0]?.resource_version ?? "";
+    await route.fulfill({ body: JSON.stringify({ save_status: "saved", state_version: 2 }), contentType: "application/json", status: 200 });
+  });
+  await page.route("**/api/v1/assets/recent?asset_kind=text_template", (route) => route.fulfill({ body: JSON.stringify({ items: [] }), contentType: "application/json", status: 200 }));
+  await page.route("**/api/v1/assets/public/**", async (route) => {
+    if (!new URL(route.request().url()).searchParams.has("variant")) originalRequests += 1;
+    await route.fulfill({ body: png, contentType: "image/png", status: 200 });
+  });
+
+  await page.goto(`${webUrl}/app/projects/${projectId}/editor`);
+  await page.getByRole("button", { name: "普通贴纸", exact: true }).click();
+  await expect(page.getByText("共 1,408 张", { exact: true })).toBeVisible();
+  const list = page.getByTestId("static-sticker-list");
+  await list.evaluate((element) => { element.scrollTop = element.scrollHeight; element.dispatchEvent(new Event("scroll")); });
+  await list.getByRole("button", { name: "添加贴纸 STK1408" }).click();
+  await expect.poll(() => savedResourceVersion).toBe("asset-20260803.1");
+  await expect.poll(() => originalRequests).toBeGreaterThan(0);
+});
diff --git a/tests/integration/wp5-05-sticker-release.test.ts b/tests/integration/wp5-05-sticker-release.test.ts
new file mode 100644
index 0000000..55028f6
--- /dev/null
+++ b/tests/integration/wp5-05-sticker-release.test.ts
@@ -0,0 +1,135 @@
+import { createHash, randomUUID } from "node:crypto";
+import { existsSync, mkdirSync, mkdtempSync, readdirSync, rmSync, writeFileSync } from "node:fs";
+import { tmpdir } from "node:os";
+import { join, resolve } from "node:path";
+import { Readable } from "node:stream";
+
+import { afterEach, describe, expect, it } from "vitest";
+
+import { HARD_LIMIT_BYTES, ManagedStorage, StorageCapacityError, StorageUnavailableError } from "../../apps/api/src/managed-storage.js";
+import { StickerReleaseService } from "../../apps/api/src/sticker-releases.js";
+
+const now = Date.parse("2026-08-03T12:00:00.000Z");
+const png = Buffer.from("iVBORw0KGgoAAAANSUhEUgAAAAQAAAADCAYAAAC09K7GAAAACXBIWXMAAAPoAAAD6AG1e1JrAAAAEklEQVQImWO4E6XxHxkzEBQAANIxHF3ECQOzAAAAAElFTkSuQmCC", "base64");
+const webp = Buffer.from("UklGRjoAAABXRUJQVlA4IC4AAADQAQCdASoGAAUAAUAmJaACdLoB+AADsAD+9IiH/pNnibPE2fJI/+Uq8Fjc3wAA", "base64");
+const roots: string[] = [];
+const closeables: Array<{ close(): void }> = [];
+
+function filesBelow(path: string): string[] {
+  if (!existsSync(path)) return [];
+  return readdirSync(path, { withFileTypes: true }).flatMap((entry) => {
+    const child = join(path, entry.name);
+    return entry.isDirectory() ? filesBelow(child) : [child];
+  });
+}
+
+function evidence(name: string, value: unknown) {
+  const directory = process.env.DADA_EVIDENCE_DIR_WP5_UPL;
+  if (!directory) return;
+  mkdirSync(directory, { recursive: true });
+  writeFileSync(resolve(directory, name), `${JSON.stringify(value, null, 2)}\n`);
+}
+
+function fixture() {
+  const dataRoot = mkdtempSync(join(tmpdir(), "dada-wp5-05-integration-"));
+  roots.push(dataRoot);
+  mkdirSync(join(dataRoot, "db"), { recursive: true });
+  const databasePath = join(dataRoot, "db", "dada.sqlite3");
+  const storage = new ManagedStorage({ dataRoot, databasePath });
+  const stickers = new StickerReleaseService({ clock: () => now, databasePath, storage });
+  closeables.push(stickers, storage);
+  return { dataRoot, stickers, storage };
+}
+
+async function upload(stickers: StickerReleaseService, stableId: string, order: number, bytes = png, mimeType: "image/png" | "image/webp" = "image/png") {
+  return stickers.upload({
+    actorId: randomUUID(),
+    content: Readable.from(bytes),
+    enabled: true,
+    expectedByteSize: bytes.byteLength,
+    expectedMimeType: mimeType,
+    expectedSha256: createHash("sha256").update(bytes).digest("hex"),
+    fileName: mimeType === "image/png" ? `${stableId}.png` : `${stableId}.webp`,
+    idempotencyKey: `upload-${randomUUID()}-${randomUUID()}`,
+    order,
+    part: 25,
+    stableId,
+  });
+}
+
+afterEach(() => {
+  for (const value of closeables.splice(0).reverse()) value.close();
+  for (const root of roots.splice(0)) rmSync(root, { force: true, recursive: true });
+});
+
+describe("TDD-WP5-UPL-001 upload metering", () => {
+  it("decodes PNG, publishes an immutable release, meters original and thumbnail, and preserves old release reads", async () => {
+    const test = fixture();
+    const before = { files: filesBelow(join(test.dataRoot, "managed-assets")), state: test.storage.getState() };
+    const published = await upload(test.stickers, "STK1408", 184);
+    const afterUpload = test.storage.getState();
+
+    expect(published.release_version).toBe("asset-20260803.1");
+    expect(published.item).toMatchObject({ enabled: true, height: 3, mime_type: "image/png", origin: "admin_uploaded", stable_id: "STK1408", width: 4 });
+    expect(afterUpload.managed_content_bytes).toBe(published.original.byte_size + published.thumbnail.byte_size);
+    expect(test.storage.inspectCounts()).toMatchObject({ active_reservations: 0, managed_files: 2, pending_cleanup: 0 });
+    expect(filesBelow(join(test.dataRoot, "managed-assets"))).toHaveLength(2);
+    expect(test.stickers.listPublic()).toMatchObject({ count: 1, items: [{ stable_id: "STK1408" }] });
+
+    const disabled = test.stickers.update({ actorId: randomUUID(), enabled: false, stableId: "STK1408" });
+    expect(disabled.release_version).toBe("asset-20260803.2");
+    expect(test.stickers.listPublic().items).toEqual([]);
+    expect(test.stickers.listPublic(published.release_version).items).toHaveLength(1);
+    expect(test.stickers.readPublicAsset(published.release_version, "STK1408", "original")?.bytes).toEqual(png);
+    expect(test.stickers.readPublicAsset(disabled.release_version, "STK1408", "original")).toBeUndefined();
+
+    evidence("fs-before.json", before);
+    evidence("fs-after.json", { files: filesBelow(join(test.dataRoot, "managed-assets")), state: test.storage.getState() });
+    evidence("db-diff.json", { releases: test.stickers.inspectCounts(), storage: test.storage.inspectCounts() });
+  });
+
+  it("allows exact equality then blocks full and unavailable storage without partial files or rows", async () => {
+    const sizing = fixture();
+    const measured = await upload(sizing.stickers, "STK1408", 184);
+    const writeBytes = measured.original.byte_size + measured.thumbnail.byte_size;
+
+    const exact = fixture();
+    exact.storage.applyControlledMeasurement(HARD_LIMIT_BYTES - writeBytes);
+    const exactResult = await upload(exact.stickers, "STK1408", 184);
+    expect(exactResult.original.byte_size + exactResult.thumbnail.byte_size).toBe(writeBytes);
+    expect(exact.storage.getState().storage_status).toBe("full");
+    const filesAtFull = filesBelow(join(exact.dataRoot, "managed-assets"));
+    const countsAtFull = exact.stickers.inspectCounts();
+    await expect(upload(exact.stickers, "STK1409", 185)).rejects.toBeInstanceOf(StorageCapacityError);
+    expect(filesBelow(join(exact.dataRoot, "managed-assets"))).toEqual(filesAtFull);
+    expect(exact.stickers.inspectCounts()).toEqual(countsAtFull);
+
+    const unavailable = fixture();
+    unavailable.storage.setAvailability({ dataRootWritable: false, diskSpaceAvailable: true, sqliteWritable: true });
+    await expect(upload(unavailable.stickers, "STK1408", 184)).rejects.toBeInstanceOf(StorageUnavailableError);
+    expect(filesBelow(join(unavailable.dataRoot, "managed-assets"))).toEqual([]);
+    expect(unavailable.stickers.inspectCounts()).toEqual({ items: 0, releases: 0, upload_receipts: 0 });
+  });
+
+  it("rejects a forged PNG before release or managed-file commit", async () => {
+    const test = fixture();
+    const forged = Buffer.concat([png.subarray(0, 8), Buffer.from("not-a-decodable-png")]);
+    await expect(upload(test.stickers, "STK1408", 184, forged)).rejects.toThrow("content_decode_invalid");
+    expect(test.storage.inspectCounts()).toMatchObject({ active_reservations: 0, managed_files: 0 });
+    expect(test.stickers.inspectCounts()).toEqual({ items: 0, releases: 0, upload_receipts: 0 });
+    expect(filesBelow(join(test.dataRoot, "managed-assets"))).toEqual([]);
+  });
+
+  it("decodes WebP and rejects stable-ID or part-order conflicts without extra writes", async () => {
+    const test = fixture();
+    const published = await upload(test.stickers, "STK1408", 184, webp, "image/webp");
+    expect(published.item).toMatchObject({ height: 5, mime_type: "image/webp", width: 6 });
+    expect(test.stickers.readPublicAsset(published.release_version, "STK1408", "original")?.bytes).toEqual(webp);
+    const files = filesBelow(join(test.dataRoot, "managed-assets"));
+    const counts = test.stickers.inspectCounts();
+    await expect(upload(test.stickers, "STK1408", 185)).rejects.toMatchObject({ httpStatus: 409, reason: "sticker_stable_id_conflict" });
+    await expect(upload(test.stickers, "STK1409", 184)).rejects.toMatchObject({ httpStatus: 409, reason: "sticker_order_conflict" });
+    expect(filesBelow(join(test.dataRoot, "managed-assets"))).toEqual(files);
+    expect(test.stickers.inspectCounts()).toEqual(counts);
+  });
+});
diff --git a/tests/integration/wp5-06-sticker-cleanup.test.ts b/tests/integration/wp5-06-sticker-cleanup.test.ts
new file mode 100644
index 0000000..b15ad1f
--- /dev/null
+++ b/tests/integration/wp5-06-sticker-cleanup.test.ts
@@ -0,0 +1,139 @@
+import { randomUUID } from "node:crypto";
+import { existsSync, mkdirSync, mkdtempSync, rmSync } from "node:fs";
+import { tmpdir } from "node:os";
+import { join } from "node:path";
+
+import { afterEach, describe, expect, it } from "vitest";
+
+import { ManagedStorage } from "../../apps/api/src/managed-storage.js";
+import { RegistrationService } from "../../apps/api/src/registration.js";
+import { MockResendAdapter } from "../../apps/api/src/resend-adapter.js";
+import { StickerReleaseService } from "../../apps/api/src/sticker-releases.js";
+import { ProjectPurgeCleanup } from "../../apps/worker/src/project-purge-cleanup.js";
+
+const roots: string[] = [];
+const closeables: Array<{ close(): void }> = [];
+
+function fixture() {
+  const dataRoot = mkdtempSync(join(tmpdir(), "dada-wp5-06-cleanup-"));
+  roots.push(dataRoot);
+  mkdirSync(join(dataRoot, "db"), { recursive: true });
+  const databasePath = join(dataRoot, "db", "dada.sqlite3");
+  const registration = new RegistrationService({
+    challengePepper: Buffer.alloc(32, 0x61),
+    currentPrivacyNoticeVersion: "p0a-registration-notice-v1",
+    databasePath,
+    invitePepper: Buffer.alloc(32, 0x62),
+    resend: new MockResendAdapter(),
+    sessionPepper: Buffer.alloc(32, 0x63),
+  });
+  const storage = new ManagedStorage({ dataRoot, databasePath });
+  const stickers = new StickerReleaseService({ databasePath, storage });
+  closeables.push(stickers, storage, registration);
+  return { dataRoot, databasePath, database: registration.database, storage };
+}
+
+function seedAdmin(database: RegistrationService["database"]) {
+  const adminId = randomUUID();
+  database.prepare(`
+    INSERT INTO users (
+      user_id, normalized_email, role, status, counts_toward_stage_limit,
+      registration_id, created_at
+    ) VALUES (?, ?, 'super_admin', 'active', 0, ?, ?)
+  `).run(adminId, `${adminId}@example.invalid`, randomUUID(), Date.now());
+  database.prepare("INSERT INTO admin_access (user_id, allowed) VALUES (?, 1)").run(adminId);
+  return adminId;
+}
+
+async function seedHistoricalPair(test: ReturnType<typeof fixture>) {
+  const original = await test.storage.commitBufferFixture("sticker_original", "STK2401.png", Buffer.from("original-history"));
+  const thumbnail = await test.storage.commitBufferFixture("sticker_thumbnail", "STK2401-thumbnail.png", Buffer.from("thumbnail-history"));
+  const insert = test.database.prepare(`
+    INSERT INTO sticker_managed_file_history (
+      managed_file_id, stable_id, resource_version, file_kind, created_at
+    ) VALUES (?, 'STK2401', 'asset-20260701.1', ?, ?)
+  `);
+  insert.run(original.file_id, "original", Date.now());
+  insert.run(thumbnail.file_id, "thumbnail", Date.now());
+  return { original, thumbnail };
+}
+
+afterEach(() => {
+  for (const value of closeables.splice(0).reverse()) value.close();
+  for (const root of roots.splice(0)) rmSync(root, { force: true, recursive: true });
+});
+
+describe("TDD-WP5-CLN-001 sticker history cleanup", () => {
+  it("denies the whole batch when a reference appears after the candidate snapshot", async () => {
+    const test = fixture();
+    const adminId = seedAdmin(test.database);
+    const files = await seedHistoricalPair(test);
+    const candidates = test.storage.listAssetCleanupCandidates();
+    expect(candidates.items).toEqual(expect.arrayContaining([
+      expect.objectContaining({ file_id: files.original.file_id, file_kind: "original", reference_count: 0, stable_id: "STK2401" }),
+      expect.objectContaining({ file_id: files.thumbnail.file_id, file_kind: "thumbnail", reference_count: 0, stable_id: "STK2401" }),
+    ]));
+    const intent = test.storage.createAssetCleanupIntent({
+      actorId: adminId,
+      fileIds: [files.original.file_id, files.thumbnail.file_id],
+      idempotencyKey: `cleanup-${randomUUID()}-${randomUUID()}`,
+      snapshotVersion: candidates.candidate_snapshot_version,
+    });
+
+    test.storage.addAssetReference(files.original.file_id, "release");
+    expect(() => test.storage.confirmAssetCleanupIntent({
+      actorId: adminId,
+      confirmationToken: intent.confirmation_token,
+      requestId: intent.request_id,
+    })).toThrow("ASSET_HISTORY_REFERENCE_CONFLICT");
+
+    expect(test.database.prepare("SELECT status FROM asset_cleanup_requests WHERE request_id = ?").get(intent.request_id)).toEqual({ status: "denied" });
+    expect(test.database.prepare("SELECT COUNT(*) AS count FROM file_cleanup_queue WHERE status = 'pending'").get()).toEqual({ count: 0 });
+    expect(test.database.prepare("SELECT COUNT(*) AS count FROM admin_operation_logs WHERE target_ref = ? AND result = 'failed'").get(intent.request_id)).toEqual({ count: 1 });
+  });
+
+  it("requires the same admin, queues without reducing capacity, then remeasures after physical deletion", async () => {
+    const test = fixture();
+    const adminId = seedAdmin(test.database);
+    const otherAdminId = seedAdmin(test.database);
+    const files = await seedHistoricalPair(test);
+    const bytesBefore = test.storage.getState().managed_content_bytes;
+    const candidates = test.storage.listAssetCleanupCandidates();
+    const intent = test.storage.createAssetCleanupIntent({
+      actorId: adminId,
+      fileIds: [files.original.file_id, files.thumbnail.file_id],
+      idempotencyKey: `cleanup-${randomUUID()}-${randomUUID()}`,
+      snapshotVersion: candidates.candidate_snapshot_version,
+    });
+
+    expect(() => test.storage.confirmAssetCleanupIntent({
+      actorId: otherAdminId,
+      confirmationToken: intent.confirmation_token,
+      requestId: intent.request_id,
+    })).toThrow("ASSET_CLEANUP_CANDIDATE_STALE");
+    const queued = test.storage.confirmAssetCleanupIntent({
+      actorId: adminId,
+      confirmationToken: intent.confirmation_token,
+      requestId: intent.request_id,
+    });
+    expect(queued).toMatchObject({ file_count: 2, status: "queued" });
+    expect(test.storage.getState().managed_content_bytes).toBe(bytesBefore);
+    expect(existsSync(join(test.dataRoot, files.original.relative_path))).toBe(true);
+    expect(test.database.prepare("SELECT COUNT(*) AS count FROM file_cleanup_queue WHERE status = 'pending'").get()).toEqual({ count: 2 });
+
+    const worker = new ProjectPurgeCleanup({ dataRoot: test.dataRoot, databasePath: test.databasePath });
+    const result = worker.processFileCleanup();
+    worker.close();
+    expect(result).toEqual({ completed: 2, failed: 0 });
+    expect(existsSync(join(test.dataRoot, files.original.relative_path))).toBe(false);
+    expect(existsSync(join(test.dataRoot, files.thumbnail.relative_path))).toBe(false);
+    expect(test.storage.getState()).toMatchObject({ managed_content_bytes: 0, storage_status: "active" });
+    expect(test.database.prepare("SELECT status FROM asset_cleanup_requests WHERE request_id = ?").get(intent.request_id)).toEqual({ status: "completed" });
+    expect(test.database.prepare("SELECT operation_type, result FROM admin_operation_logs WHERE target_ref = ? ORDER BY occurred_at").all(intent.request_id)).toEqual([
+      { operation_type: "asset_cleanup_requested", result: "succeeded" },
+      { operation_type: "asset_cleanup_validated", result: "succeeded" },
+      { operation_type: "asset_cleanup_scheduled", result: "succeeded" },
+      { operation_type: "asset_cleanup_physical_completed", result: "succeeded" },
+    ]);
+  });
+});
diff --git a/tests/unit/wp5-04-asset-release-manifest.test.ts b/tests/unit/wp5-04-asset-release-manifest.test.ts
new file mode 100644
index 0000000..c9e2f3a
--- /dev/null
+++ b/tests/unit/wp5-04-asset-release-manifest.test.ts
@@ -0,0 +1,101 @@
+import { createHash } from "node:crypto";
+
+import { describe, expect, it } from "vitest";
+
+import { createAssetReleaseManifest } from "../../packages/asset-release-manifest/src/index.js";
+
+const releaseVersion = "asset-20260803.1";
+const publicId = "7f0c9530-a7d9-4bf1-8c65-0e9298dd04ac";
+const previewId = "ab18fd72-60e1-44e3-a9a0-3dfccb12e17c";
+const privateId = "e3792605-5252-4d3b-a101-827408ab3515";
+
+function fixture() {
+  return createAssetReleaseManifest({
+    items: [
+      {
+        access_class: "public_release_asset",
+        cache_kind: "thumbnail",
+        content: Buffer.from("public-content"),
+        mime_type: "image/png",
+        relative_path: "public/thumbnails/FLOWER001.png",
+        resource_id: publicId,
+        root_ref: "canonical-assets",
+      },
+      {
+        access_class: "internal_preview_asset",
+        content: Buffer.from("preview-content"),
+        mime_type: "image/webp",
+        relative_path: "preview/batch-7/FLOWER009.webp",
+        resource_id: previewId,
+        root_ref: "canonical-assets",
+      },
+      {
+        access_class: "private_user_asset",
+        content: Buffer.from("private-content"),
+        mime_type: "image/png",
+        owner_id: "owner-1",
+        relative_path: "private/owner-1/generated.png",
+        resource_id: privateId,
+        root_ref: "managed-assets",
+      },
+    ],
+    release_version: releaseVersion,
+  });
+}
+
+describe("TASK-WP5-04 immutable asset release manifest", () => {
+  it("projects only the selected access class and never exposes source paths", () => {
+    const manifest = fixture();
+    const projected = manifest.project("public_release_asset", releaseVersion);
+
+    expect(Object.isFrozen(projected)).toBe(true);
+    expect(projected?.manifest_sha256).toMatch(/^[0-9a-f]{64}$/);
+    expect(projected?.items).toEqual([expect.objectContaining({
+      access_class: "public_release_asset",
+      resource_id: publicId,
+      sha256: createHash("sha256").update("public-content").digest("hex"),
+      url: `/api/v1/assets/public/${releaseVersion}/${publicId}`,
+    })]);
+    const serialized = JSON.stringify(projected);
+    expect(serialized).not.toContain(previewId);
+    expect(serialized).not.toContain(privateId);
+    expect(serialized).not.toContain("relative_path");
+    expect(serialized).not.toContain("root_ref");
+    expect(serialized).not.toMatch(/[A-Z]:\\\\/i);
+  });
+
+  it("keeps resource identifiers opaque, verifies file hashes, and rejects unsafe manifests", () => {
+    const manifest = fixture();
+    expect(manifest.read("public_release_asset", releaseVersion, publicId)?.bytes).toEqual(Buffer.from("public-content"));
+    expect(manifest.read("public_release_asset", releaseVersion, previewId)).toBeUndefined();
+    expect(manifest.project("private_user_asset", releaseVersion, { ownerId: "owner-1" })?.items)
+      .toEqual([expect.objectContaining({ resource_id: privateId })]);
+    expect(manifest.project("private_user_asset", releaseVersion, { ownerId: "owner-2" })?.items).toEqual([]);
+
+    expect(() => createAssetReleaseManifest({
+      items: [{
+        access_class: "public_release_asset",
+        cache_kind: "thumbnail",
+        content: Buffer.from("tampered"),
+        mime_type: "image/png",
+        relative_path: "public/tampered.png",
+        resource_id: publicId,
+        root_ref: "canonical-assets",
+        sha256: "0".repeat(64),
+      }],
+      release_version: releaseVersion,
+    })).toThrow(/sha-?256/i);
+    expect(() => createAssetReleaseManifest({
+      items: [{
+        access_class: "public_release_asset",
+        cache_kind: "thumbnail",
+        content: Buffer.from("unsafe"),
+        mime_type: "image/png",
+        relative_path: "/outside/private.png",
+        resource_id: publicId,
+        root_ref: "canonical-assets",
+      }],
+      release_version: releaseVersion,
+    })).toThrow(/relative path/i);
+  });
+});