diff --git a/server/adapters/repos/api-key-scopes.ts b/server/adapters/repos/api-key-scopes.ts
index 6f2dc72a..42ee3ddd 100644
--- a/server/adapters/repos/api-key-scopes.ts
+++ b/server/adapters/repos/api-key-scopes.ts
@@ -1,8 +1,7 @@
-import { type ApiKeyScope, ApiKeyTemplate, apiKeyMetadata, parseApiKeyScope } from '@shared/api-key-templates'
-import { and, eq, inArray } from 'drizzle-orm'
-import { apikey, member } from '../../db/auth-schema'
+import { type ApiKeyScope, ApiKeyTemplate, parseApiKeyScope } from '@shared/api-key-templates'
+import { inArray } from 'drizzle-orm'
+import { apikey } from '../../db/auth-schema'
 import type { Database } from '../../platform/interface'
-import { resolveOrganizationOwnerUserId } from './organization-owner'
 
 const WORKSPACE_TEMPLATES = [ApiKeyTemplate.IHOST, ApiKeyTemplate.REMOTE_DOWNLOAD]
 
@@ -17,80 +16,6 @@ export function scopeForApiKey(configId: string, metadata: unknown): ApiKeyScope
   return null
 }
 
-export async function normalizeLegacyApiKey(
-  db: Database,
-  key: { id: string; configId: string; referenceId: string; metadata: unknown },
-): Promise<{ referenceId: string; scope: ApiKeyScope } | null> {
-  const existingScope = scopeForApiKey(key.configId, key.metadata)
-  if (existingScope) return { referenceId: key.referenceId, scope: existingScope }
-
-  if (key.configId === ApiKeyTemplate.WEBDAV) {
-    const scope = { mode: 'user-workspaces' } as const
-    await db
-      .update(apikey)
-      .set({ metadata: JSON.stringify(apiKeyMetadata(scope)), updatedAt: new Date() })
-      .where(and(eq(apikey.id, key.id), eq(apikey.referenceId, key.referenceId)))
-    return { referenceId: key.referenceId, scope }
-  }
-
-  if (!WORKSPACE_TEMPLATES.includes(key.configId as (typeof WORKSPACE_TEMPLATES)[number])) return null
-
-  let ownerUserId: string
-  try {
-    ownerUserId = await resolveOrganizationOwnerUserId(db, key.referenceId)
-  } catch {
-    await db.update(apikey).set({ enabled: false, updatedAt: new Date() }).where(eq(apikey.id, key.id))
-    return null
-  }
-
-  const scope = { mode: 'workspace', orgId: key.referenceId } as const
-  await db
-    .update(apikey)
-    .set({
-      referenceId: ownerUserId,
-      metadata: JSON.stringify(apiKeyMetadata(scope)),
-      updatedAt: new Date(),
-    })
-    .where(and(eq(apikey.id, key.id), eq(apikey.referenceId, key.referenceId)))
-  return { referenceId: ownerUserId, scope }
-}
-
-export async function normalizeLegacyApiKeysForUser(db: Database, userId: string): Promise<void> {
-  const webDavKeys = await db
-    .select({ id: apikey.id, metadata: apikey.metadata })
-    .from(apikey)
-    .where(and(eq(apikey.configId, ApiKeyTemplate.WEBDAV), eq(apikey.referenceId, userId)))
-  const legacyWebDavKeyIds = webDavKeys
-    .filter(({ metadata }) => scopeForApiKey(ApiKeyTemplate.WEBDAV, parseMetadata(metadata)) === null)
-    .map(({ id }) => id)
-  if (legacyWebDavKeyIds.length > 0) {
-    await db
-      .update(apikey)
-      .set({
-        metadata: JSON.stringify(apiKeyMetadata({ mode: 'user-workspaces' })),
-        updatedAt: new Date(),
-      })
-      .where(inArray(apikey.id, legacyWebDavKeyIds))
-  }
-
-  const ownedOrgs = await db
-    .select({ orgId: member.organizationId })
-    .from(member)
-    .where(and(eq(member.userId, userId), eq(member.role, 'owner')))
-
-  for (const { orgId } of ownedOrgs) {
-    if ((await resolveOrganizationOwnerUserId(db, orgId)) !== userId) continue
-    await db
-      .update(apikey)
-      .set({
-        referenceId: userId,
-        metadata: JSON.stringify(apiKeyMetadata({ mode: 'workspace', orgId })),
-        updatedAt: new Date(),
-      })
-      .where(and(inArray(apikey.configId, WORKSPACE_TEMPLATES), eq(apikey.referenceId, orgId)))
-  }
-}
-
 export async function deleteApiKeysScopedToOrganization(db: Database, orgId: string): Promise<void> {
   const rows = await db
     .select({ id: apikey.id, configId: apikey.configId, referenceId: apikey.referenceId, metadata: apikey.metadata })
diff --git a/server/adapters/repos/api-keys-rate-limit.integration.test.ts b/server/adapters/repos/api-keys-rate-limit.integration.test.ts
index a7d898fd..4d02e326 100644
--- a/server/adapters/repos/api-keys-rate-limit.integration.test.ts
+++ b/server/adapters/repos/api-keys-rate-limit.integration.test.ts
@@ -3,6 +3,7 @@ import { describe, expect, it } from 'vitest'
 import {
   WEBDAV_API_KEY_RATE_LIMIT_MAX_REQUESTS,
   WEBDAV_API_KEY_RATE_LIMIT_WINDOW_MS,
+  WEBDAV_RATE_LIMITER_BINDING,
 } from '../../../shared/api-key-templates.js'
 import { authedHeaders, createTestApp } from '../../test/setup.js'
 import { ApiKeyRateLimitError } from '../../usecases/ports'
@@ -108,6 +109,26 @@ describe('API keys', () => {
     expect(listed.apiKeys.every((key) => key.referenceId === userId)).toBe(true)
   })
 
+  it('defers Better Auth WebDAV key bookkeeping when the native limiter is authoritative', async () => {
+    const backgroundTasks: Promise<unknown>[] = []
+    const { app, db, auth } = await createTestApp({}, { [WEBDAV_RATE_LIMITER_BINDING]: {} }, (task) =>
+      backgroundTasks.push(task),
+    )
+    await authedHeaders(app)
+    const { userId } = await getUserAndOrg(db)
+    // biome-ignore lint/suspicious/noExplicitAny: better-auth plugin API is not fully typed
+    const webdav = (await (auth.api as any).createApiKey({
+      body: { configId: 'webdav', userId },
+    })) as { key: string }
+    await Promise.all(backgroundTasks.splice(0))
+
+    await expect(
+      apiKeys.verifyApiKeyForPermission(auth, db, webdav.key, 'webdav', 'read', 'webdav'),
+    ).resolves.toMatchObject({ referenceId: userId })
+    expect(backgroundTasks.length).toBeGreaterThan(0)
+    await Promise.all(backgroundTasks)
+  })
+
   it('persists the configured defaults for each API key template', async () => {
     const { app, db, auth } = await createTestApp()
     await authedHeaders(app)
@@ -159,7 +180,7 @@ describe('API keys', () => {
     })
   })
 
-  it('normalizes a legacy organization-owned key to the current owner', async () => {
+  it('rejects legacy API keys instead of upgrading them during verification', async () => {
     const { app, db, auth } = await createTestApp()
     const headers = await authedHeaders(app)
     const { orgId, userId } = await getUserAndOrg(db)
@@ -176,32 +197,18 @@ describe('API keys', () => {
     `)
     await db.run(sql`UPDATE apikey SET metadata = '{}' WHERE id = ${webdav.id}`)
 
-    await expect(apiKeys.verifyApiKey(auth, db, remoteDownload.key, 'remote-download')).resolves.toMatchObject({
-      referenceId: userId,
-      scope: { mode: 'workspace', orgId },
-    })
+    await expect(apiKeys.verifyApiKey(auth, db, remoteDownload.key, 'remote-download')).resolves.toBeNull()
     const row = await getApiKeyRow(db, remoteDownload.id)
-    expect(row.reference_id).toBe(userId)
-    expect(JSON.parse(row.metadata as string)).toEqual({ scope: { mode: 'workspace', orgId } })
+    expect(row.reference_id).toBe(orgId)
+    expect(JSON.parse(row.metadata as string)).toEqual({})
 
     const listResponse = await app.request('/api/auth/api-key/list', { headers })
     expect(listResponse.status).toBe(200)
     const listed = (await listResponse.json()) as {
       apiKeys: Array<{ id: string; metadata: { scope: { mode: string; orgId?: string } } }>
     }
-    expect(listed.apiKeys).toEqual(
-      expect.arrayContaining([
-        expect.objectContaining({
-          id: ihost.id,
-          metadata: { scope: { mode: 'workspace', orgId } },
-        }),
-        expect.objectContaining({
-          id: webdav.id,
-          metadata: { scope: { mode: 'user-workspaces' } },
-        }),
-      ]),
-    )
-    expect(await getApiKeyRow(db, ihost.id)).toMatchObject({ reference_id: userId })
+    expect(listed.apiKeys).toEqual([expect.objectContaining({ id: webdav.id, metadata: {} })])
+    expect(await getApiKeyRow(db, ihost.id)).toMatchObject({ reference_id: orgId })
   })
 
   it('deletes workspace-scoped keys with their organization but preserves WebDAV keys', async () => {
diff --git a/server/adapters/repos/api-keys.ts b/server/adapters/repos/api-keys.ts
index ea610338..24e34b4e 100644
--- a/server/adapters/repos/api-keys.ts
+++ b/server/adapters/repos/api-keys.ts
@@ -4,7 +4,7 @@ import { eq } from 'drizzle-orm'
 import { apikey } from '../../db/auth-schema'
 import type { Database } from '../../platform/interface'
 import { type ApiKeyAuth, type ApiKeyGateway, ApiKeyRateLimitError, type VerifiedApiKey } from '../../usecases/ports'
-import { normalizeLegacyApiKey } from './api-key-scopes'
+import { scopeForApiKey } from './api-key-scopes'
 
 type VerifyApiKeyResult = {
   valid: boolean
@@ -25,7 +25,7 @@ export function createApiKeyGateway(): ApiKeyGateway {
       if (!resolvedConfigId) return null
       const result = await verify(auth, { configId: resolvedConfigId, key })
       throwIfRateLimited(result)
-      if (result?.valid && result.key) return normalizeVerifiedApiKey(db, result.key)
+      if (result?.valid && result.key) return normalizeVerifiedApiKey(result.key)
       return null
     },
 
@@ -38,7 +38,7 @@ export function createApiKeyGateway(): ApiKeyGateway {
         permissions: { [resource]: [action] },
       })
       throwIfRateLimited(result)
-      if (result?.valid && result.key) return normalizeVerifiedApiKey(db, result.key)
+      if (result?.valid && result.key) return normalizeVerifiedApiKey(result.key)
       return null
     },
 
@@ -48,17 +48,14 @@ export function createApiKeyGateway(): ApiKeyGateway {
   }
 }
 
-async function normalizeVerifiedApiKey(
-  db: Database,
-  key: NonNullable<VerifyApiKeyResult['key']>,
-): Promise<VerifiedApiKey | null> {
-  const normalized = await normalizeLegacyApiKey(db, key)
-  if (!normalized) return null
+async function normalizeVerifiedApiKey(key: NonNullable<VerifyApiKeyResult['key']>): Promise<VerifiedApiKey | null> {
+  const scope = scopeForApiKey(key.configId, key.metadata)
+  if (!scope) return null
   return {
     id: key.id,
     configId: key.configId,
-    referenceId: normalized.referenceId,
-    scope: normalized.scope,
+    referenceId: key.referenceId,
+    scope,
     permissions: key.permissions,
   }
 }
diff --git a/server/auth.ts b/server/auth.ts
index eda8c22d..16e522c9 100644
--- a/server/auth.ts
+++ b/server/auth.ts
@@ -38,7 +38,7 @@ import {
 } from '../shared/oauth-providers'
 import { generateUserOrgSlug, isPersonalOrgLike } from '../shared/org-slugs'
 import { createEmailGateway } from './adapters/gateways/email'
-import { deleteApiKeysScopedToOrganization, normalizeLegacyApiKeysForUser } from './adapters/repos/api-key-scopes'
+import { deleteApiKeysScopedToOrganization } from './adapters/repos/api-key-scopes'
 import { createAuditRepo } from './adapters/repos/audit'
 import { createInviteRepo } from './adapters/repos/invite'
 import { createLicenseBindingRepo } from './adapters/repos/license-binding'
@@ -311,6 +311,7 @@ export async function createAuth(
   secret: string,
   baseURL?: string,
   trustedOrigins?: string[],
+  backgroundTaskHandler?: (promise: Promise<unknown>) => void,
 ) {
   const isPlatform = 'db' in initialSource
   const rawPlatform = isPlatform ? initialSource : null
@@ -347,6 +348,7 @@ export async function createAuth(
       // better-auth silently disables it under NODE_ENV=test, so tests would
       // never exercise the real CSRF/origin behavior.
       disableOriginCheck: false,
+      ...(backgroundTaskHandler ? { backgroundTasks: { handler: backgroundTaskHandler } } : {}),
     },
     user: {
       additionalFields: {
@@ -382,7 +384,7 @@ export async function createAuth(
     session: {
       cookieCache: {
         enabled: true,
-        maxAge: 60 * 5,
+        maxAge: 60,
       },
     },
     socialProviders: Object.fromEntries(
@@ -393,11 +395,6 @@ export async function createAuth(
         if (ctx.path === '/delete-user') {
           throw new APIError('FORBIDDEN', { message: 'Self-service account deletion is not available' })
         }
-        if (ctx.path === '/api-key/list') {
-          const session = await getSessionFromCtx(ctx)
-          if (session?.user.id) await normalizeLegacyApiKeysForUser(db, session.user.id)
-          return
-        }
         if (ctx.path !== '/api-key/create') return
 
         const body = ctx.body as Record<string, unknown> | undefined
@@ -568,6 +565,10 @@ export async function createAuth(
           configId: ApiKeyTemplate.WEBDAV,
           references: 'user',
           enableMetadata: true,
+          // Cloudflare's native limiter remains the authoritative synchronous
+          // rate limit. Better Auth can therefore move its bookkeeping write
+          // off the response path without weakening enforcement.
+          deferUpdates: usesNativeWebDavRateLimit && backgroundTaskHandler !== undefined,
           rateLimit: {
             enabled: !usesNativeWebDavRateLimit,
             // Filesystem clients such as macOS Finder issue bursts of PROPFIND
diff --git a/server/http/admin-users-ba.integration.test.ts b/server/http/admin-users-ba.integration.test.ts
index ef016845..b620ac22 100644
--- a/server/http/admin-users-ba.integration.test.ts
+++ b/server/http/admin-users-ba.integration.test.ts
@@ -42,8 +42,8 @@ describe('better-auth admin user endpoints (migration target)', () => {
     expect(res.status).toBe(403)
   })
 
-  it('POST /api/auth/admin/ban-user sets banned, and our middleware then rejects the user [spec: users/disable]', async () => {
-    const { app, db } = await createTestApp()
+  it('POST /api/auth/admin/ban-user sets banned and revokes the Better Auth session [spec: users/disable] [spec: users/disabled-session-rejected]', async () => {
+    const { app, db, auth } = await createTestApp()
     const headers = await adminCookie(app)
     const memberHeaders = await authedHeaders(app, 'ban-me@example.com', 'password123456')
     const rows = await db.all<{ id: string }>(sql`SELECT id FROM user WHERE email = 'ban-me@example.com'`)
@@ -68,9 +68,17 @@ describe('better-auth admin user endpoints (migration target)', () => {
     )
     expect(disableEvt).toEqual([{ user_id: adminId, target_id: userId }])
 
-    // The banned user's existing session is rejected by our auth middleware.
-    const blocked = await app.request('/api/quotas/me', { headers: memberHeaders })
-    expect(blocked.status).toBe(403)
+    // Better Auth's signed cookie cache has a bounded revocation window, so
+    // ordinary routes can still use this one-minute cached session.
+    const cached = await app.request('/api/quotas/me', { headers: memberHeaders })
+    expect(cached.status).toBe(200)
+
+    // Bypassing the cookie cache proves that Better Auth deleted the session.
+    const revoked = await auth.api.getSession({
+      headers: new Headers(memberHeaders),
+      query: { disableCookieCache: true },
+    })
+    expect(revoked).toBeNull()
 
     // Unban restores access and is audited as user_enable.
     const unban = await app.request('/api/auth/admin/unban-user', {
diff --git a/server/http/share-utils.ts b/server/http/share-utils.ts
index 18c6f01b..16f79495 100644
--- a/server/http/share-utils.ts
+++ b/server/http/share-utils.ts
@@ -26,9 +26,6 @@ export function escapeLike(s: string): string {
   return s.replace(/[\\%_]/g, '\\$&')
 }
 
-export async function readUserId(c: Context<Env>): Promise<string | null> {
-  const session = (await c.get('auth').api.getSession({ headers: c.req.raw.headers })) as {
-    user: { id: string }
-  } | null
-  return session?.user?.id ?? null
+export function readUserId(c: Context<Env>): string | null {
+  return c.get('userId')
 }
diff --git a/server/http/users.integration.test.ts b/server/http/users.integration.test.ts
index e081e310..cdbbcd7a 100644
--- a/server/http/users.integration.test.ts
+++ b/server/http/users.integration.test.ts
@@ -82,20 +82,6 @@ describe('User entitlements API (admin)', () => {
     expect(res.status).toBe(404)
   })
 
-  it('auth middleware rejects a banned user on an existing session [spec: users/disabled-session-rejected]', async () => {
-    const { app, db } = await createTestApp()
-
-    // Capture a live session, then ban the user. Admin ban/unban is served by
-    // better-auth's /admin/ban-user; here we only assert our middleware enforces it.
-    const userHeaders = await authedHeaders(app, 'banned@example.com')
-    await db.run(sql`UPDATE user SET banned = 1 WHERE email = 'banned@example.com'`)
-
-    const res = await app.request('/api/quotas/me', { headers: userHeaders })
-    expect(res.status).toBe(403)
-    const body = (await res.json()) as { error: { message: string } }
-    expect(body.error.message).toBe('Account disabled')
-  })
-
   it('POST /api/users/:id/entitlements grants storage entitlement for a personal org [spec: users/grant-entitlement]', async () => {
     const { app, db } = await createTestApp()
     const headers = await adminHeaders(app)
diff --git a/server/http/webdav.ts b/server/http/webdav.ts
index c97a7449..ce03262a 100644
--- a/server/http/webdav.ts
+++ b/server/http/webdav.ts
@@ -26,7 +26,6 @@ import { isDownloadFailureStatus, transferAuditActor, transferFailureReason } fr
 import type { Env } from '../middleware/platform'
 import {
   ApiKeyRateLimitError,
-  type CachePolicy,
   insufficientCredits,
   type RecordAuditEventInput,
   type StorageRecord,
@@ -80,41 +79,10 @@ type DavAuth = {
   permissions: Record<string, string[]> | null
 }
 
-type VerifiedWebDavAuth = Extract<Awaited<ReturnType<typeof resolveWebDavAuth>>, { ok: true }>
-
 interface NativeRateLimiter {
   limit(options: { key: string }): Promise<{ success: boolean }>
 }
 
-// The native limiter still counts every request. This only collapses repeated D1
-// verification inside a Finder burst; memory-only storage bounds revocation lag
-// to one second and keeps credential-derived keys out of KV.
-const WEBDAV_AUTH_CACHE_POLICY: CachePolicy<VerifiedWebDavAuth> = {
-  namespace: 'webdav-auth',
-  version: 1,
-  ttlMs: 1_000,
-  maxEntries: 256,
-  distributed: false,
-  validate(value): value is VerifiedWebDavAuth {
-    if (typeof value !== 'object' || value === null) return false
-    const auth = value as Partial<VerifiedWebDavAuth>
-    return (
-      auth.ok === true &&
-      typeof auth.userId === 'string' &&
-      typeof auth.keyId === 'string' &&
-      typeof auth.configId === 'string' &&
-      (auth.permissions === null ||
-        (typeof auth.permissions === 'object' && auth.permissions !== null && !Array.isArray(auth.permissions)))
-    )
-  },
-}
-
-class WebDavAuthRejected extends Error {
-  constructor(readonly outcome: Exclude<Awaited<ReturnType<typeof resolveWebDavAuth>>, { ok: true }>) {
-    super('WebDAV authentication rejected')
-  }
-}
-
 const cloudBaseUrl = (c: DavContext): string => c.get('platform').getEnv('ZPAN_CLOUD_URL') ?? ZPAN_CLOUD_URL_DEFAULT
 
 async function requireWebDavApiKey(c: DavContext): Promise<DavAuth | Response> {
@@ -135,29 +103,16 @@ async function requireWebDavApiKey(c: DavContext): Promise<DavAuth | Response> {
   }
 
   const startedAt = performance.now()
-  const loadAuth = async () => {
-    const result = await resolveWebDavAuth(c.get('deps'), {
-      auth: c.get('auth'),
-      db: c.get('platform').db,
-      username: credentials.username,
-      password: credentials.password,
-      resource: WEBDAV_RESOURCE,
-      action,
-      configId: ApiKeyTemplate.WEBDAV,
-    })
-    if (!result.ok) throw new WebDavAuthRejected(result)
-    return result
-  }
-  let result: Awaited<ReturnType<typeof resolveWebDavAuth>>
-  try {
-    result =
-      nativeRateLimiter && credentialKey
-        ? (await c.get('deps').cache.getOrLoad(WEBDAV_AUTH_CACHE_POLICY, `${credentialKey}:${action}`, loadAuth)).value
-        : await loadAuth()
-  } catch (error) {
-    if (!(error instanceof WebDavAuthRejected)) throw error
-    result = error.outcome
-  }
+  const result = await resolveWebDavAuth(c.get('deps'), {
+    auth: c.get('auth'),
+    db: c.get('platform').db,
+    username: credentials.username,
+    password: credentials.password,
+    resource: WEBDAV_RESOURCE,
+    action,
+    configId: ApiKeyTemplate.WEBDAV,
+    cacheKey: nativeRateLimiter && credentialKey ? `${credentialKey}:${action}` : undefined,
+  })
   c.get('webDavTrace').push(`auth:${Math.round(performance.now() - startedAt)}`)
   if (!result.ok) {
     if (result.reason === 'rate_limited')
diff --git a/server/middleware/auth.ts b/server/middleware/auth.ts
index 87339512..0717be39 100644
--- a/server/middleware/auth.ts
+++ b/server/middleware/auth.ts
@@ -77,12 +77,6 @@ export const authMiddleware = createMiddleware<Env>(async (c, next) => {
   const auth = c.get('auth')
   const result = (await auth.api.getSession({ headers: c.req.raw.headers })) as SessionWithPlugins | null
 
-  if (result?.user?.id) {
-    if (await c.get('deps').userAdmin.isBanned(result.user.id)) {
-      throw forbidden('Account disabled')
-    }
-  }
-
   c.set('userId', result?.user?.id ?? null)
   c.set('userRole', result?.user?.role ?? null)
 
@@ -118,12 +112,14 @@ export const requireAuth = createMiddleware<Env>(async (c, next) => {
 })
 
 export const requireAdmin = createMiddleware<Env>(async (c, next) => {
-  const userId = c.get('userId')
-  if (!userId) {
+  const result = (await c.get('auth').api.getSession({
+    headers: c.req.raw.headers,
+    query: { disableCookieCache: true },
+  })) as SessionWithPlugins | null
+  if (!result?.user?.id) {
     throw unauthorized('Unauthorized')
   }
-  const userRole = c.get('userRole')
-  if (userRole !== 'admin') {
+  if (result.user.role !== 'admin') {
     throw forbidden('Forbidden')
   }
   await next()
diff --git a/server/test/setup.ts b/server/test/setup.ts
index 7f2bf02c..41cc152d 100644
--- a/server/test/setup.ts
+++ b/server/test/setup.ts
@@ -628,6 +628,7 @@ const APP_SCHEMA_SQL = `
 export async function createTestApp(
   envOverrides: Record<string, string> = {},
   bindingOverrides: Record<string, unknown> = {},
+  backgroundTaskHandler?: (promise: Promise<unknown>) => void,
 ) {
   // Each test app is a brand-new site; drop origin state cached by a previous
   // app in the same test file.
@@ -643,7 +644,7 @@ export async function createTestApp(
     getEnv: (key: string) => envOverrides[key],
     getBinding: <T = unknown>(key: string) => bindingOverrides[key] as T | undefined,
   }
-  const auth = await createAuth(platform, 'test-secret', 'http://localhost:3000')
+  const auth = await createAuth(platform, 'test-secret', 'http://localhost:3000', undefined, backgroundTaskHandler)
   const deps = createDeps(platform)
   const app = createApp(platform, auth, deps)
 
diff --git a/server/usecases/webdav.test.ts b/server/usecases/webdav.test.ts
index f5e33dc3..09579862 100644
--- a/server/usecases/webdav.test.ts
+++ b/server/usecases/webdav.test.ts
@@ -4,6 +4,7 @@ import type { Database } from '../platform/interface'
 import type {
   ApiKeyAuth,
   ApiKeyGateway,
+  CacheService,
   CloudTrafficReportRepo,
   DavLock,
   DownloadTaskRecord,
@@ -125,6 +126,12 @@ function makeDeps(
       verifyApiKeyForPermission: async () => ({ id: 'k1', configId: 'webdav', referenceId: 'u1', permissions: null }),
       ...overrides.apiKeys,
     } as unknown as ApiKeyGateway,
+    cache: {
+      mode: 'off',
+      getOrLoad: async (_policy, _key, loader) => ({ value: await loader(), tier: 'bypass' }),
+      replace: async () => {},
+      invalidate: async () => {},
+    } as CacheService,
     userAdmin: {
       isBanned: async () => false,
       matchesActiveUsername: async () => true,
diff --git a/server/usecases/webdav.ts b/server/usecases/webdav.ts
index d9bd66ad..62b4b921 100644
--- a/server/usecases/webdav.ts
+++ b/server/usecases/webdav.ts
@@ -21,6 +21,7 @@ import { assertFolderNotUsedByDownload } from './downloads/download-folders'
 import {
   type ApiKeyAuth,
   ApiKeyRateLimitError,
+  type CachePolicy,
   type DavDeadProperty,
   type DavLock,
   type DeadPropertyUpdate,
@@ -48,7 +49,65 @@ export type WebDavAuthOutcome =
   | { ok: false; reason: 'unauthorized' }
   | { ok: false; reason: 'rate_limited'; retryAfterMs?: number; message: string }
 
+type VerifiedWebDavAuth = Extract<WebDavAuthOutcome, { ok: true }>
+
+const WEBDAV_AUTH_CACHE_POLICY: CachePolicy<VerifiedWebDavAuth> = {
+  namespace: 'webdav-auth',
+  version: 1,
+  ttlMs: 1_000,
+  maxEntries: 256,
+  distributed: false,
+  validate(value): value is VerifiedWebDavAuth {
+    if (typeof value !== 'object' || value === null) return false
+    const auth = value as Partial<VerifiedWebDavAuth>
+    return (
+      auth.ok === true &&
+      typeof auth.userId === 'string' &&
+      typeof auth.keyId === 'string' &&
+      typeof auth.configId === 'string' &&
+      (auth.permissions === null ||
+        (typeof auth.permissions === 'object' && auth.permissions !== null && !Array.isArray(auth.permissions)))
+    )
+  },
+}
+
+class WebDavAuthRejected extends Error {
+  constructor(readonly outcome: Exclude<WebDavAuthOutcome, { ok: true }>) {
+    super('WebDAV authentication rejected')
+  }
+}
+
 export async function resolveWebDavAuth(
+  deps: Pick<Deps, 'apiKeys' | 'cache' | 'userAdmin'>,
+  params: {
+    auth: ApiKeyAuth
+    db: Database
+    username: string
+    password: string
+    resource: string
+    action: 'read' | 'write'
+    configId: string
+    cacheKey?: string
+  },
+): Promise<WebDavAuthOutcome> {
+  const load = () => verifyWebDavAuth(deps, params)
+  if (!params.cacheKey) return load()
+
+  try {
+    return (
+      await deps.cache.getOrLoad(WEBDAV_AUTH_CACHE_POLICY, params.cacheKey, async () => {
+        const result = await load()
+        if (!result.ok) throw new WebDavAuthRejected(result)
+        return result
+      })
+    ).value
+  } catch (error) {
+    if (error instanceof WebDavAuthRejected) return error.outcome
+    throw error
+  }
+}
+
+async function verifyWebDavAuth(
   deps: Pick<Deps, 'apiKeys' | 'userAdmin'>,
   params: {
     auth: ApiKeyAuth
diff --git a/spec/users.feature b/spec/users.feature
index affb1248..fda07b90 100644
--- a/spec/users.feature
+++ b/spec/users.feature
@@ -1,8 +1,8 @@
 Feature: User administration
   Admin user management runs through better-auth's admin plugin
   (/api/auth/admin/*). ZPan owns the per-user storage quota and the entitlement
-  grants against each user's personal org, and enforces bans in its auth
-  middleware.
+  grants against each user's personal org. Better Auth owns ban enforcement and
+  session revocation.
 
   @users/admin-only @api
   Scenario: Non-admins cannot administer users
@@ -35,10 +35,10 @@ Feature: User administration
     Then the API responds 404
 
   @users/disabled-session-rejected @api
-  Scenario: A disabled user's existing session is rejected
+  Scenario: A disabled user's server session is revoked
     Given a user disabled mid-session
-    When they make an authenticated request
-    Then the auth middleware rejects it
+    When authentication bypasses the bounded signed-cookie cache
+    Then Better Auth rejects the revoked session
 
   @users/delete @api
   Scenario: Admins delete a user
diff --git a/workers/bootstrap.ts b/workers/bootstrap.ts
index 6fc03ad8..ffa52ba8 100644
--- a/workers/bootstrap.ts
+++ b/workers/bootstrap.ts
@@ -1,3 +1,4 @@
+import { waitUntil } from 'cloudflare:workers'
 import { createCloudflareKvBackend } from '../server/adapters/cache/cloudflare-kv'
 import { createRuntimeCache, resolveCacheMode } from '../server/adapters/cache/runtime-cache'
 import { createArchiveJobsGateway } from '../server/adapters/gateways/archive-jobs'
@@ -90,7 +91,7 @@ async function appForRequest(
   const cachedAuth = runtime.authBySlot.get(slot)
   if (cachedApp && cachedAuth) return cachedApp
 
-  const auth = await createAuth(runtime.platform, env.BETTER_AUTH_SECRET, baseURL, trustedOrigins)
+  const auth = await createAuth(runtime.platform, env.BETTER_AUTH_SECRET, baseURL, trustedOrigins, waitUntil)
   const app = createApp(runtime.platform, auth, runtime.deps)
   runtime.authBySlot.set(slot, auth)
   runtime.appBySlot.set(slot, app)