diff --git a/docs/IM_PLATFORM.zh.md b/docs/IM_PLATFORM.zh.md
index 60cd473..e4f55f4 100644
--- a/docs/IM_PLATFORM.zh.md
+++ b/docs/IM_PLATFORM.zh.md
@@ -66,6 +66,8 @@ interface IMPlatform<L> {
 
 同一个 Cordis platform entry 对应一个账号和一个虚拟手机号。bridge 在 `/platform-accounts` 页面展示平台资料、手机号和每 30 秒轮换的六位 TOTP 登录码。`user.avatar` 继续使用 adapter 的 typed `IMMedia<L>`，页面头像由 bridge 调用 `downloadMedia()` 读取；TOTP secret 和 credentials 不会下发到浏览器。
 
+页面上的「删除账号」删掉的是**这一条 platform entry 和它的登录面**：平台会话、虚拟手机号、TOTP secret、两步验证密码和客户端授权一起清理，绑定在这些凭据上的客户端会被登出，最后 entry 从配置文件里移除（所以重启后不会再被 provision）。消息、会话和 `mtproto_im_user` 身份行保留：它们按 platform session 隔离，条目删掉后不再可达，用同一个 entry id 重新配置时旧消息仍属于同一个平台用户。删除只对由配置文件（loader）管理的 entry 生效，adapter 直接 `ctx.plugin()` 注册的条目会被拒绝，需要自行停用。
+
 ## 2. ID 与幂等
 
 - user、conversation、message、media 和 group ID 都是 opaque string。
diff --git a/packages/bridge/client/accounts.tsx b/packages/bridge/client/accounts.tsx
index 609e11f..9f8c992 100644
--- a/packages/bridge/client/accounts.tsx
+++ b/packages/bridge/client/accounts.tsx
@@ -7,9 +7,13 @@ import {
   Index,
   onCleanup,
   Show,
+  untrack,
 } from 'solid-js'
 import type {
   PlatformAccountDashboardData,
+  PlatformAccountDuplicateGroup,
+  PlatformAccountRemovalPreview,
+  PlatformAccountServerEndpoint,
   PlatformAccountView,
 } from '../src/dashboard-types.js'
 import { useRpc, type PageProps } from 'cordis-webui-solidjs/client'
@@ -24,18 +28,27 @@ import {
 import { sessionToken } from 'cordis-webui-solidjs/session'
 import {
   copyText,
+  describeDuplicateGroup,
+  duplicateOwners,
+  duplicatePlatformIds,
+  formatEndpoint,
   formatPhone,
   parseTelegramLoginUrl,
   remainingSeconds,
   safeImageURL,
   sameOriginPath,
+  withServerEndpoint,
 } from './bridge-model.js'
 export default function AccountsPage(props: PageProps) {
   const rpc = useRpc<PlatformAccountDashboardData>(props.entryId),
     action = useAction()
   const [now, setNow] = createSignal(Date.now()),
     [qr, setQr] = createSignal(false),
-    [copied, setCopied] = createSignal(false)
+    [copied, setCopied] = createSignal(false),
+    [endpointKey, setEndpointKey] = createSignal(''),
+    [selected, setSelected] = createSignal<string[]>([]),
+    [deleting, setDeleting] = createSignal<string[] | null>(null),
+    [duplicates, setDuplicates] = createSignal<PlatformAccountDuplicateGroup[]>([])
   const tick = () => {
       if (!document.hidden) setNow(Date.now())
     },
@@ -55,8 +68,42 @@ export default function AccountsPage(props: PageProps) {
       ),
   )
   const ids = createMemo(() => [...accounts().keys()])
+  // Duplicate detection is a durable backend answer, so it is fetched once per
+  // connection instead of riding the per-second account snapshot.
+  const duplicateScan = useAction()
+  const scanDuplicates = async () => {
+    await duplicateScan.run(async () => {
+      setDuplicates((await rpc.data.findDuplicateAccounts()) ?? [])
+    })
+  }
+  createEffect(() => {
+    if (!rpc.ready) return
+    untrack(() => void scanDuplicates())
+  })
+  const duplicateOf = createMemo(() => duplicateOwners(duplicates()))
+  // Copying for another endpoint must not silently change the default: nothing is
+  // selected until the reader picks an endpoint, and the primary entry wins then.
+  const endpoints = createMemo<PlatformAccountServerEndpoint[]>(
+    () => rpc.data.serverEndpoints ?? [],
+  )
+  const endpoint = createMemo(() => {
+    const list = endpoints(),
+      key = endpointKey()
+    return (
+      list.find((item) => formatEndpoint(item) === key) ??
+      list.find((item) => item.primary) ??
+      list[0]
+    )
+  })
+  // The page displays and copies the same document, for the selected endpoint.
+  const configuredEndpoint = createMemo(() => {
+    const config = rpc.data.serverConfig,
+      target = endpoint()
+    // Without an advertised endpoint list the document stays exactly as configured.
+    return config && target ? withServerEndpoint(config, target) : config
+  })
   const configuration = createMemo(() =>
-    JSON.stringify(rpc.data.serverConfig, null, 2),
+    JSON.stringify(configuredEndpoint(), null, 2),
   )
   const [search, setSearch] = createSignal(''),
     [limit, setLimit] = createSignal(24)
@@ -68,6 +115,20 @@ export default function AccountsPage(props: PageProps) {
         .includes(search().toLowerCase())
     }),
   )
+  const duplicateIds = createMemo(() => duplicatePlatformIds(duplicates()))
+  const toggle = (id: string, on: boolean) =>
+    setSelected((current) =>
+      on
+        ? current.includes(id)
+          ? current
+          : [...current, id]
+        : current.filter((value) => value !== id),
+    )
+  const afterRemoval = async () => {
+    setSelected([])
+    setDeleting(null)
+    await scanDuplicates()
+  }
   return (
     <>
       <PageHeader
@@ -78,7 +139,12 @@ export default function AccountsPage(props: PageProps) {
             <button
               class="button outlined"
               disabled={action.busy() || !rpc.ready}
-              onClick={() => void action.run(() => rpc.data.refresh())}
+              onClick={() =>
+                void action.run(async () => {
+                  await rpc.data.refresh()
+                  await scanDuplicates()
+                })
+              }
             >
               Refresh accounts
             </button>
@@ -102,18 +168,39 @@ export default function AccountsPage(props: PageProps) {
               Import this server configuration into a patched Crossgram client.
             </p>
           </div>
-          <button
-            class="button tonal"
-            disabled={!rpc.ready || !rpc.data.serverConfig}
-            onClick={() =>
-              void action.run(async () => {
-                await copyText(configuration()!)
-                setCopied(true)
-              })
-            }
-          >
-            {copied() ? 'Configuration copied' : 'Copy server configuration'}
-          </button>
+          <div class="connection-config-actions">
+            <Show when={endpoints().length > 1}>
+              <label class="field endpoint-picker">
+                <span>Endpoint</span>
+                <select
+                  aria-label="Copy endpoint"
+                  value={endpoint() ? formatEndpoint(endpoint()!) : ''}
+                  onChange={(event) => setEndpointKey(event.currentTarget.value)}
+                >
+                  <For each={endpoints()}>
+                    {(item) => (
+                      <option value={formatEndpoint(item)}>
+                        {formatEndpoint(item)}
+                        {item.primary ? ' (main)' : ''}
+                      </option>
+                    )}
+                  </For>
+                </select>
+              </label>
+            </Show>
+            <button
+              class="button tonal"
+              disabled={!rpc.ready || !rpc.data.serverConfig}
+              onClick={() =>
+                void action.run(async () => {
+                  await copyText(configuration()!)
+                  setCopied(true)
+                })
+              }
+            >
+              {copied() ? 'Configuration copied' : 'Copy server configuration'}
+            </button>
+          </div>
           <details>
             <summary>View server configuration</summary>
             <pre aria-label="Server configuration">{configuration()}</pre>
@@ -123,6 +210,36 @@ export default function AccountsPage(props: PageProps) {
           <h2>Your identities</h2>
           <span class="muted">{ids().length} accounts</span>
         </div>
+        <Show when={duplicateIds().length}>
+          <section class="panel account-duplicates" data-duplicates>
+            <div>
+              <strong>
+                {duplicateIds().length} duplicate account
+                {duplicateIds().length > 1 ? 's' : ''}
+              </strong>
+              <p>
+                Entries that resolve to the same platform user, or that lost
+                their virtual phone to another entry. Nothing is deleted until
+                you confirm the list.
+              </p>
+              <ul class="muted">
+                <For each={duplicates()}>
+                  {(group) => <li>{describeDuplicateGroup(group)}</li>}
+                </For>
+              </ul>
+            </div>
+            <button
+              class="button outlined"
+              onClick={() =>
+                setSelected((current) => [
+                  ...new Set([...current, ...duplicateIds()]),
+                ])
+              }
+            >
+              Select duplicates
+            </button>
+          </section>
+        </Show>
         <label class="field account-search">
           <span class="sr-only">Find an account</span>
           <input
@@ -135,6 +252,25 @@ export default function AccountsPage(props: PageProps) {
             }}
           />
         </label>
+        <Show when={selected().length}>
+          <div
+            class="toolbar account-selection"
+            role="group"
+            aria-label="Selected accounts"
+          >
+            <span class="muted">{selected().length} selected</span>
+            <button class="button outlined" onClick={() => setSelected([])}>
+              Clear selection
+            </button>
+            <button
+              class="button danger"
+              disabled={!rpc.ready}
+              onClick={() => setDeleting(selected())}
+            >
+              Delete selected
+            </button>
+          </div>
+        </Show>
         <div class="platform-account-grid">
           <For each={filtered().slice(0, limit())}>
             {(id) => (
@@ -142,6 +278,10 @@ export default function AccountsPage(props: PageProps) {
                 account={accounts().get(id)!}
                 now={now()}
                 connected={rpc.ready}
+                selected={selected().includes(id)}
+                duplicateOf={duplicateOf().get(id)}
+                onSelect={(on) => toggle(id, on)}
+                onDelete={() => setDeleting([id])}
                 setPassword={(password) => rpc.data.setLoginPassword(id, password)}
               />
             )}
@@ -176,6 +316,14 @@ export default function AccountsPage(props: PageProps) {
           onClose={() => setQr(false)}
         />
       </Show>
+      <Show when={deleting()}>
+        <DeleteAccounts
+          data={rpc.data}
+          platformIds={deleting()!}
+          onClose={() => setDeleting(null)}
+          onDeleted={afterRemoval}
+        />
+      </Show>
     </>
   )
 }
@@ -183,6 +331,11 @@ export function AccountCard(props: {
   account: PlatformAccountView
   now: number
   connected: boolean
+  selected: boolean
+  /** Entry this account duplicates, when the backend proved it is a duplicate. */
+  duplicateOf?: string
+  onSelect: (selected: boolean) => void
+  onDelete: () => void
   setPassword: (password: string | null) => Promise<void>
 }) {
   const [failedAvatar, setFailedAvatar] = createSignal(false),
@@ -211,9 +364,18 @@ export function AccountCard(props: {
   return (
     <article
       class="panel identity-card"
+      classList={{ selected: props.selected }}
       data-platform={props.account.platformId}
     >
       <header>
+        <label class="account-select">
+          <input
+            type="checkbox"
+            checked={props.selected}
+            aria-label={'Select ' + props.account.platformId}
+            onChange={(event) => props.onSelect(event.currentTarget.checked)}
+          />
+        </label>
         <div class="identity-avatar">
           <Show
             when={avatar() && !failedAvatar()}
@@ -238,6 +400,13 @@ export function AccountCard(props: {
         </div>
         <span class="chip">{props.account.platformKind}</span>
       </header>
+      <Show when={props.duplicateOf}>
+        <div class="identity-duplicate" data-duplicate-of={props.duplicateOf}>
+          <span class="chip duplicate">
+            Duplicate of {props.duplicateOf}
+          </span>
+        </div>
+      </Show>
       <dl class="identity-meta">
         <div>
           <dt>Platform</dt>
@@ -361,11 +530,110 @@ export function AccountCard(props: {
           }}
         />
       </Show>
+      <div class="toolbar identity-actions">
+        <button
+          class="button danger"
+          aria-label={'Delete ' + props.account.platformId}
+          disabled={!props.connected}
+          onClick={props.onDelete}
+        >
+          Delete account
+        </button>
+      </div>
       <ActionError error={action.error()} />
     </article>
   )
 }
 
+/**
+ * Confirmation for one or more platform entries. The description comes from the
+ * backend, so the dialog names the exact entries and how many Telegram clients
+ * are signed in through them before anything is removed.
+ */
+function DeleteAccounts(props: {
+  data: PlatformAccountDashboardData
+  platformIds: string[]
+  onClose: () => void
+  onDeleted: () => Promise<void>
+}) {
+  const [preview, setPreview] =
+    createSignal<PlatformAccountRemovalPreview>()
+  const load = useAction(),
+    remove = useAction()
+  void load.run(async () => {
+    setPreview(await props.data.describeAccountRemoval(props.platformIds))
+  })
+  const unmanaged = () =>
+    (preview()?.targets ?? []).filter((target) => !target.managed)
+  const accounts = () => preview()?.targets ?? []
+  return (
+    <Modal title="Delete platform accounts" onClose={props.onClose}>
+      <p>
+        The platform entries below are removed from the configuration, together
+        with their virtual phone, login code and two-step verification password.
+        Their message history stays in the database.
+      </p>
+      <Show when={load.busy() && !preview()}>
+        <p role="status">Checking what will be removed…</p>
+      </Show>
+      <ul class="removal-targets">
+        <For each={accounts()}>
+          {(target) => (
+            <li>
+              <strong>{target.displayName || target.platformId}</strong>
+              <span class="muted">
+                {' '}
+                {target.displayName ? target.platformId + ' · ' : ''}
+                {target.platformKind}
+              </span>
+            </li>
+          )}
+        </For>
+      </ul>
+      <Show when={preview()?.clientAuthorizations}>
+        <p class="notice error" role="alert">
+          {preview()!.clientAuthorizations} Telegram client
+          {preview()!.clientAuthorizations > 1 ? 's' : ''} signed in through
+          the selected entries will be signed out.
+        </p>
+      </Show>
+      <Show when={unmanaged().length}>
+        <p class="notice error" role="alert">
+          {unmanaged()
+            .map((target) => target.platformId)
+            .join(', ')}{' '}
+          {unmanaged().length > 1 ? 'are' : 'is'} not managed by the
+          configuration file. Disable the plugin entry instead.
+        </p>
+      </Show>
+      <ActionError error={load.error() || remove.error()} />
+      <div class="toolbar">
+        <button
+          class="button danger"
+          disabled={
+            remove.busy() || load.busy() || !preview() || unmanaged().length > 0
+          }
+          onClick={() =>
+            void remove.run(async () => {
+              await props.data.deleteAccounts(props.platformIds)
+              await props.onDeleted()
+            })
+          }
+        >
+          {remove.busy() ? 'Deleting…' : 'Delete accounts'}
+        </button>
+        <button
+          class="button outlined"
+          disabled={remove.busy()}
+          onClick={props.onClose}
+        >
+          Cancel
+        </button>
+      </div>
+    </Modal>
+  )
+}
+
 function PasswordModal(props: {
   hasPassword: boolean
   onClose: () => void
diff --git a/packages/bridge/client/bridge-model.test.ts b/packages/bridge/client/bridge-model.test.ts
index 805acf2..93f4556 100644
--- a/packages/bridge/client/bridge-model.test.ts
+++ b/packages/bridge/client/bridge-model.test.ts
@@ -1,12 +1,21 @@
 import { afterEach, describe, expect, it, vi } from 'vitest'
+import type {
+  CrossGramServerConfig,
+  PlatformAccountDuplicateGroup,
+} from '../src/dashboard-types.js'
 import {
   botLink,
   copyText,
+  describeDuplicateGroup,
+  duplicateOwners,
+  duplicatePlatformIds,
+  formatEndpoint,
   formatPhone,
   parseTelegramLoginUrl,
   remainingSeconds,
   safeImageURL,
   sameOriginPath,
+  withServerEndpoint,
 } from './bridge-model.js'
 afterEach(() => vi.restoreAllMocks())
 describe('bridge dashboard input boundaries', () => {
@@ -53,3 +62,87 @@ describe('bridge dashboard input boundaries', () => {
     await expect(copyText('credential')).rejects.toThrow('permission denied')
   })
 })
+describe('copied configuration endpoints', () => {
+  const config: CrossGramServerConfig = {
+    name: 'CrossGram',
+    enable_special_config: false,
+    host: '203.0.113.8',
+    port: 4430,
+    rsa_key: 'PUBLIC_KEY',
+    dcs: [
+      { id: 1, ip: '203.0.113.8', port: 4430 },
+      { id: 2, ip: '203.0.113.8', port: 4430 },
+    ],
+  }
+  it('formats endpoints the way a client configuration spells them', () => {
+    expect(formatEndpoint({ host: '203.0.113.8', port: 4430 })).toBe(
+      '203.0.113.8:4430',
+    )
+    expect(formatEndpoint({ host: '2001:db8::1', port: 8443 })).toBe(
+      '[2001:db8::1]:8443',
+    )
+  })
+  it('rewrites only the host and port of a copied document', () => {
+    const rewritten = withServerEndpoint(config, {
+      host: 'backup.example.test',
+      port: 8443,
+      primary: false,
+    })
+    expect(rewritten).toEqual({
+      ...config,
+      host: 'backup.example.test',
+      port: 8443,
+      dcs: [
+        { id: 1, ip: 'backup.example.test', port: 8443 },
+        { id: 2, ip: 'backup.example.test', port: 8443 },
+      ],
+    })
+    // The copied document keeps the page's readable layout, only the address differs.
+    expect(JSON.stringify(rewritten, null, 2)).toContain('"host": "backup.example.test"')
+    // Selecting the primary endpoint leaves the document exactly as configured.
+    expect(
+      withServerEndpoint(config, {
+        host: '203.0.113.8',
+        port: 4430,
+        primary: true,
+      }),
+    ).toEqual(config)
+  })
+})
+
+describe('duplicate account presentation', () => {
+  const groups: PlatformAccountDuplicateGroup[] = [
+    {
+      keep: 'qqnt',
+      remove: ['qqnt-2', 'qqnt-3'],
+      reason: 'virtual-phone',
+    },
+    { keep: 'matrix', remove: ['matrix-2'], reason: 'identity' },
+  ]
+  it('maps every duplicated entry to the entry that keeps the account', () => {
+    expect([...duplicateOwners(groups)]).toEqual([
+      ['qqnt-2', 'qqnt'],
+      ['qqnt-3', 'qqnt'],
+      ['matrix-2', 'matrix'],
+    ])
+    expect(duplicateOwners([]).size).toBe(0)
+  })
+  it('lists duplicated entries once, in a stable order', () => {
+    expect(duplicatePlatformIds(groups)).toEqual([
+      'matrix-2',
+      'qqnt-2',
+      'qqnt-3',
+    ])
+    expect(
+      duplicatePlatformIds([...groups, { keep: 'other', remove: ['qqnt-2'], reason: 'identity' }]),
+    ).toEqual(['matrix-2', 'qqnt-2', 'qqnt-3'])
+  })
+  it('states why a group counts as duplicated', () => {
+    expect(describeDuplicateGroup(groups[0]!)).toBe(
+      'qqnt-2, qqnt-3 duplicate qqnt (already serves the same virtual phone)',
+    )
+    expect(describeDuplicateGroup(groups[1]!)).toBe(
+      'matrix-2 duplicates matrix (resolves to the same platform user)',
+    )
+  })
+})
diff --git a/packages/bridge/client/bridge-model.ts b/packages/bridge/client/bridge-model.ts
index 56f4af5..edcb5fb 100644
--- a/packages/bridge/client/bridge-model.ts
+++ b/packages/bridge/client/bridge-model.ts
@@ -1,3 +1,8 @@
+import type {
+  CrossGramServerConfig,
+  PlatformAccountDuplicateGroup,
+  PlatformAccountServerEndpoint,
+} from '../src/dashboard-types.js'
 export function parseTelegramLoginUrl(value: string): string | undefined {
   try {
     const url = new URL(value),
@@ -60,5 +65,61 @@ export function formatPhone(value?: string): string {
     return '+888 ' + digits.slice(3).replace(/(\d)(?=(\d{3})+$)/g, '$1 ')
   return '+' + digits.replace(/(\d)(?=(\d{3})+$)/g, '$1 ')
 }
+/** `host:port`, bracketing IPv6 hosts the way a client configuration spells them. */
+export function formatEndpoint(endpoint: { host: string; port: number }): string {
+  return (
+    (endpoint.host.includes(':') ? '[' + endpoint.host + ']' : endpoint.host) +
+    ':' +
+    endpoint.port
+  )
+}
+/** Point a copy of the server configuration at one advertised endpoint. */
+export function withServerEndpoint(
+  config: CrossGramServerConfig,
+  endpoint: PlatformAccountServerEndpoint,
+): CrossGramServerConfig {
+  return {
+    ...config,
+    host: endpoint.host,
+    port: endpoint.port,
+    dcs: config.dcs.map((dc) => ({ ...dc, ip: endpoint.host, port: endpoint.port })),
+  }
+}
+/**
+ * Entry each duplicated platform entry duplicates. The backend only reports
+ * entries it can prove are duplicates, so the map is safe to render directly.
+ */
+export function duplicateOwners(
+  groups: readonly PlatformAccountDuplicateGroup[],
+): Map<string, string> {
+  const owners = new Map<string, string>()
+  for (const group of groups)
+    for (const platformId of group.remove)
+      if (!owners.has(platformId)) owners.set(platformId, group.keep)
+  return owners
+}
+/** Every entry that duplicates another one, in a stable order. */
+export function duplicatePlatformIds(
+  groups: readonly PlatformAccountDuplicateGroup[],
+): string[] {
+  return [...new Set(groups.flatMap((group) => group.remove))].sort()
+}
+/** Describe one duplicate group for the cleanup banner. */
+export function describeDuplicateGroup(
+  group: PlatformAccountDuplicateGroup,
+): string {
+  const reason =
+    group.reason === 'virtual-phone'
+      ? 'already serves the same virtual phone'
+      : 'resolves to the same platform user'
+  return (
+    group.remove.join(', ') +
+    (group.remove.length > 1 ? ' duplicate ' : ' duplicates ') +
+    group.keep +
+    ' (' +
+    reason +
+    ')'
+  )
+}
 
 export { sameOriginPath, copyText } from "cordis-webui-solidjs/utils"
diff --git a/packages/bridge/client/style.css b/packages/bridge/client/style.css
index d97e413..679901f 100644
--- a/packages/bridge/client/style.css
+++ b/packages/bridge/client/style.css
@@ -29,6 +29,77 @@
     margin: 20px 0;
     max-width: 480px;
   }
+  .connection-config-actions {
+    display: flex;
+    align-items: flex-end;
+    gap: 12px;
+    flex-wrap: wrap;
+  }
+  .endpoint-picker {
+    min-width: 0;
+  }
+  .endpoint-picker select {
+    max-width: 260px;
+  }
+  .account-duplicates {
+    display: flex;
+    align-items: center;
+    justify-content: space-between;
+    flex-wrap: wrap;
+    gap: 16px;
+    border-color: var(--tertiary);
+  }
+  .account-duplicates strong {
+    font-size: 15px;
+  }
+  .account-duplicates p {
+    margin-top: 6px;
+    font-size: 12.5px;
+    opacity: 0.85;
+  }
+  .account-duplicates ul {
+    margin: 8px 0 0;
+    padding-left: 18px;
+    font-size: 12px;
+    overflow-wrap: anywhere;
+  }
+  .account-selection {
+    margin-bottom: 16px;
+  }
+  .identity-card.selected {
+    outline: 2px solid var(--primary);
+    outline-offset: -1px;
+  }
+  .identity-card > header {
+    gap: 12px;
+  }
+  .account-select {
+    display: flex;
+    align-items: center;
+    flex: none;
+  }
+  .account-select input {
+    width: 18px;
+    height: 18px;
+  }
+  .identity-duplicate {
+    display: flex;
+  }
+  .chip.duplicate {
+    background: var(--tertiary-container);
+    color: var(--on-tertiary-container);
+  }
+  .identity-actions {
+    margin-top: auto;
+  }
+  .removal-targets {
+    margin: 0;
+    padding-left: 18px;
+    display: grid;
+    gap: 6px;
+    font-size: 13px;
+    overflow-wrap: anywhere;
+  }
   .platform-account-grid {
     display: grid;
     grid-template-columns: repeat(auto-fill, minmax(min(100%, 350px), 1fr));
diff --git a/packages/bridge/src/account-dashboard.test.ts b/packages/bridge/src/account-dashboard.test.ts
index c95dba3..d7be195 100644
--- a/packages/bridge/src/account-dashboard.test.ts
+++ b/packages/bridge/src/account-dashboard.test.ts
@@ -1,7 +1,7 @@
 import { describe, expect, it } from 'vitest'
 import type { ProvisionedPlatformAccount } from './platform-account.js'
 import {
-  makeCrossGramServerConfig, makePlatformAccountView, makeUnavailableAccountView,
+  makeCrossGramServerConfig, makePlatformAccountView, makeServerEndpoints, makeUnavailableAccountView,
 } from './account-dashboard.js'
 
 const provisioned: ProvisionedPlatformAccount = {
@@ -60,4 +60,19 @@ describe('platform account dashboard projection', () => {
       /altEndpoints|privateKey|rsaKeyPath|token|credentials|totp/i,
     )
   })
+
+  it('offers the advertised endpoints for copying, main first and without duplicates', () => {
+    expect(makeServerEndpoints('203.0.113.8', 4430, [
+      'backup.example:8443',
+      '203.0.113.8:4430',
+      '[2001:db8::1]:4430',
+    ])).toEqual([
+      { host: '203.0.113.8', port: 4430, primary: true },
+      { host: 'backup.example', port: 8443, primary: false },
+      { host: '2001:db8::1', port: 4430, primary: false },
+    ])
+    expect(makeServerEndpoints('203.0.113.8', 4430)).toEqual([
+      { host: '203.0.113.8', port: 4430, primary: true },
+    ])
+  })
 })
diff --git a/packages/bridge/src/account-dashboard.ts b/packages/bridge/src/account-dashboard.ts
index 213db92..ec11504 100644
--- a/packages/bridge/src/account-dashboard.ts
+++ b/packages/bridge/src/account-dashboard.ts
@@ -1,9 +1,10 @@
 import type { ProvisionedPlatformAccount } from './platform-account.js'
 import { getLoginCodeState } from './login-code.js'
 import { isValidSrpVerifier } from './login-srp.js'
+import { parseEndpoint } from './synthetic.js'
 
-import type { CrossGramServerConfig, PlatformAccountStatus, PlatformAccountView } from './dashboard-types.js'
-export type { CrossGramServerConfig, CrossGramServerConfigDc, PlatformAccountDashboardData, PlatformAccountStatus, PlatformAccountView } from './dashboard-types.js'
+import type { CrossGramServerConfig, PlatformAccountServerEndpoint, PlatformAccountStatus, PlatformAccountView } from './dashboard-types.js'
+export type { CrossGramServerConfig, CrossGramServerConfigDc, PlatformAccountDashboardData, PlatformAccountStatus, PlatformAccountServerEndpoint, PlatformAccountView } from './dashboard-types.js'
 
 export function makeCrossGramServerConfig(
   host: string,
@@ -20,6 +21,29 @@ export function makeCrossGramServerConfig(
   }
 }
 
+/**
+ * Endpoints a copied configuration can point at: the configured main endpoint
+ * first, then every advertised alternative in configuration order. The list only
+ * describes where a client may connect; it never changes what the bridge
+ * advertises to clients through `help.getConfig`.
+ */
+export function makeServerEndpoints(
+  host: string,
+  port: number,
+  altEndpoints: readonly string[] = [],
+): PlatformAccountServerEndpoint[] {
+  const endpoints: PlatformAccountServerEndpoint[] = [{ host, port, primary: true }]
+  const seen = new Set([`${host}:${port}`])
+  for (const endpoint of altEndpoints) {
+    const parsed = parseEndpoint(endpoint)
+    const key = `${parsed.host}:${parsed.port}`
+    if (seen.has(key)) continue
+    seen.add(key)
+    endpoints.push({ ...parsed, primary: false })
+  }
+  return endpoints
+}
+
 export function makePlatformAccountView(
   platformId: string,
   platformKind: string,
diff --git a/packages/bridge/src/account-duplicates.test.ts b/packages/bridge/src/account-duplicates.test.ts
new file mode 100644
index 0000000..fdd5821
--- /dev/null
+++ b/packages/bridge/src/account-duplicates.test.ts
@@ -0,0 +1,69 @@
+import { describe, expect, it } from 'vitest'
+import { findDuplicateAccounts, type PlatformAccountDuplicateCandidate } from './account-duplicates.js'
+
+const candidate = (
+  platformId: string,
+  values: Partial<PlatformAccountDuplicateCandidate> = {},
+): PlatformAccountDuplicateCandidate => ({
+  platformId,
+  platformKind: 'qq',
+  clientAuthorizations: 0,
+  ...values,
+})
+
+describe('platform account duplicate detection', () => {
+  it('groups entries that resolve to the same platform user and keeps the entry clients use', () => {
+    expect(findDuplicateAccounts([
+      candidate('qq-one', { userId: 'qq-10001', clientAuthorizations: 1 }),
+      candidate('qq-two', { userId: 'qq-10001', clientAuthorizations: 3 }),
+      candidate('qq-other', { userId: 'qq-10002' }),
+      candidate('matrix', { platformKind: 'matrix', userId: 'qq-10001' }),
+    ])).toEqual([
+      { keep: 'qq-two', remove: ['qq-one'], reason: 'identity' },
+    ])
+  })
+
+  it('prefers the stable entry id order when no entry is signed in', () => {
+    expect(findDuplicateAccounts([
+      candidate('qq-b', { userId: 'uid' }),
+      candidate('qq-a', { userId: 'uid' }),
+    ])).toEqual([{ keep: 'qq-a', remove: ['qq-b'], reason: 'identity' }])
+  })
+
+  it('reports an entry that lost its virtual phone to the entry already serving the account', () => {
+    expect(findDuplicateAccounts([
+      candidate('qqnt', { userId: 'uid', clientAuthorizations: 2 }),
+      candidate('qqnt-2', { claimedBy: 'qqnt' }),
+      candidate('qqnt-3', { claimedBy: 'qqnt' }),
+    ])).toEqual([
+      {
+        keep: 'qqnt',
+        remove: ['qqnt-2', 'qqnt-3'],
+        reason: 'virtual-phone',
+      },
+    ])
+  })
+
+  it('never reports an entry twice or invents duplicates from unrelated failures', () => {
+    expect(findDuplicateAccounts([
+      candidate('qqnt', { userId: 'uid' }),
+      // The same user id, but the phone claim already explains the entry.
+      candidate('qqnt-2', { userId: 'uid', claimedBy: 'qqnt' }),
+      // Adapter failures without an identity are not duplicates.
+      candidate('offline', { platformKind: 'discord' }),
+      candidate('unsupported', { platformKind: 'wechat' }),
+      // A claim from an entry that is no longer registered proves nothing.
+      candidate('stale', { claimedBy: 'removed-entry' }),
+    ])).toEqual([
+      { keep: 'qqnt', remove: ['qqnt-2'], reason: 'virtual-phone' },
+    ])
+  })
+
+  it('reports nothing when every account is distinct', () => {
+    expect(findDuplicateAccounts([
+      candidate('qq-one', { userId: 'uid-1' }),
+      candidate('qq-two', { userId: 'uid-2' }),
+      candidate('offline'),
+    ])).toEqual([])
+  })
+})
diff --git a/packages/bridge/src/account-duplicates.ts b/packages/bridge/src/account-duplicates.ts
new file mode 100644
index 0000000..0be1712
--- /dev/null
+++ b/packages/bridge/src/account-duplicates.ts
@@ -0,0 +1,82 @@
+import type { PlatformAccountDuplicateGroup } from './dashboard-types.js'
+
+/** One registered platform entry, reduced to the durable facts duplicate detection needs. */
+export interface PlatformAccountDuplicateCandidate {
+  platformId: string
+  platformKind: string
+  /** Platform-owned user id, present once the adapter provisioned successfully. */
+  userId?: string
+  /**
+   * Platform entry that already owns this entry's virtual phone. Only set when
+   * provisioning failed on the deterministic phone invariant, which proves the
+   * entry describes an account another entry is already serving.
+   */
+  claimedBy?: string
+  /** Telegram clients signed in through the entry. */
+  clientAuthorizations: number
+}
+
+/**
+ * Group platform entries that describe the same platform account.
+ *
+ * Two entries are duplicates when either
+ * - their adapters resolved to the same platform user (`platformKind` plus `userId`), or
+ * - one of them could not be provisioned because another entry already owns its
+ *   virtual phone, which is only possible for a platform identity that is already served.
+ *
+ * Entries that failed for any other reason (adapter offline, provider unsupported)
+ * carry no identity at all, so they are never reported as duplicates.
+ *
+ * The kept entry is the one clients are already signed in through, with the stable
+ * entry id order as the tie-breaker.
+ */
+export function findDuplicateAccounts(
+  candidates: readonly PlatformAccountDuplicateCandidate[],
+): PlatformAccountDuplicateGroup[] {
+  const known = new Set(candidates.map((candidate) => candidate.platformId))
+  const groups = new Map<string, PlatformAccountDuplicateGroup>()
+  const claimed = new Set<string>()
+  const groupFor = (keep: string, reason: PlatformAccountDuplicateGroup['reason']) => {
+    const existing = groups.get(keep)
+    if (existing) return existing
+    const group: PlatformAccountDuplicateGroup = { keep, remove: [], reason }
+    groups.set(keep, group)
+    return group
+  }
+  // Claimed entries come first so a failed duplicate is never also reported as an
+  // identity duplicate of the entry whose phone it failed to claim.
+  for (const candidate of candidates) {
+    if (!candidate.claimedBy || !known.has(candidate.claimedBy)) continue
+    groupFor(candidate.claimedBy, 'virtual-phone').remove.push(candidate.platformId)
+    claimed.add(candidate.platformId)
+  }
+  const byIdentity = new Map<string, PlatformAccountDuplicateCandidate[]>()
+  for (const candidate of candidates) {
+    if (claimed.has(candidate.platformId) || !candidate.userId) continue
+    const key = `${candidate.platformKind}\0${candidate.userId}`
+    const members = byIdentity.get(key)
+    if (members) members.push(candidate)
+    else byIdentity.set(key, [candidate])
+  }
+  for (const members of byIdentity.values()) {
+    if (members.length < 2) continue
+    const [keep, ...remove] = [...members].sort(compareDuplicateMembers)
+    const group = groupFor(keep!.platformId, 'identity')
+    for (const member of remove) {
+      if (!group.remove.includes(member.platformId)) group.remove.push(member.platformId)
+    }
+  }
+  return [...groups.values()]
+    .filter((group) => group.remove.length > 0)
+    .sort((left, right) => left.keep.localeCompare(right.keep))
+}
+
+function compareDuplicateMembers(
+  left: PlatformAccountDuplicateCandidate,
+  right: PlatformAccountDuplicateCandidate,
+): number {
+  return (
+    right.clientAuthorizations - left.clientAuthorizations ||
+    left.platformId.localeCompare(right.platformId)
+  )
+}
diff --git a/packages/bridge/src/account-removal-loader.test.ts b/packages/bridge/src/account-removal-loader.test.ts
new file mode 100644
index 0000000..c1da2ae
--- /dev/null
+++ b/packages/bridge/src/account-removal-loader.test.ts
@@ -0,0 +1,70 @@
+import { mkdtemp, readFile, writeFile } from 'node:fs/promises'
+import { tmpdir } from 'node:os'
+import { join } from 'node:path'
+import { pathToFileURL } from 'node:url'
+import { Context } from 'cordis'
+import { Loader } from '@cordisjs/plugin-loader'
+import { afterEach, describe, expect, it } from 'vitest'
+import { isLoaderManagedEntry, platformEntry, removePlatformEntry } from './account-removal.js'
+
+const disposals: Array<() => Promise<void>> = []
+
+afterEach(async () => {
+  for (const dispose of disposals.splice(0)) await dispose()
+})
+
+/**
+ * The real loader keys entries loaded from a config file with the path of the
+ * tree that loaded them, which app.yml goes through in production
+ * (`@cordisjs/plugin-cli-cordis` loads the file with `@cordisjs/plugin-include`).
+ * Deleting an account therefore has to be checked against the real tree, not a
+ * stand-in: removing the qualified key alone silently leaves the entry in place.
+ */
+async function fixture() {
+  const directory = await mkdtemp(join(tmpdir(), 'account-removal-loader-'))
+  const config = join(directory, 'app.yml')
+  await writeFile(join(directory, 'package.json'), JSON.stringify({
+    name: 'account-removal-loader-test', type: 'module', dependencies: {},
+  }), 'utf8')
+  const plugin = join(directory, 'plugin.mjs')
+  await writeFile(plugin, 'export function apply() {}', 'utf8')
+  const name = pathToFileURL(plugin).href
+  await writeFile(config, [
+    `- id: bridge01`, `  name: '${name}'`, '',
+    `- id: qqnt`, `  name: '${name}'`, '',
+    `- id: qqnt-2`, `  name: '${name}'`, '',
+  ].join('\n'), 'utf8')
+  const ctx = new Context()
+  const loader = ctx.plugin(Loader)
+  await loader
+  disposals.push(async () => { await Promise.resolve((loader as any).dispose?.()) })
+  await ctx.loader.create({
+    name: '@cordisjs/plugin-include',
+    config: { path: pathToFileURL(config).href, enableLogs: false },
+  })
+  await new Promise(resolve => setTimeout(resolve, 100))
+  return { ctx, config }
+}
+
+describe('platform entry removal against the real loader', () => {
+  it('finds and deletes an entry loaded from the configuration file', async () => {
+    const { ctx, config } = await fixture()
+    expect(platformEntry(ctx, 'qqnt-2')?.options.id).toBe('qqnt-2')
+    expect(platformEntry(ctx, 'qqnt-2')?.id).not.toBe('qqnt-2')
+    expect(isLoaderManagedEntry(ctx, 'qqnt')).toBe(true)
+
+    removePlatformEntry(ctx, 'qqnt-2')
+    const remaining = [...ctx.loader!.entries()].map(entry => entry.options.id)
+    expect(remaining).not.toContain('qqnt-2')
+    expect(remaining).toContain('qqnt')
+    // The owning tree writes the file back, so the duplicate cannot return on restart.
+    await new Promise(resolve => setTimeout(resolve, 50))
+    expect(await readFile(config, 'utf8')).not.toContain('qqnt-2')
+    expect(isLoaderManagedEntry(ctx, 'qqnt-2')).toBe(false)
+  })
+
+  it('refuses an entry the configuration file never declared', async () => {
+    const { ctx } = await fixture()
+    expect(() => removePlatformEntry(ctx, 'qqnt-3')).toThrow('不是由配置文件管理的')
+  })
+})
diff --git a/packages/bridge/src/account-removal.test.ts b/packages/bridge/src/account-removal.test.ts
new file mode 100644
index 0000000..b6db5ed
--- /dev/null
+++ b/packages/bridge/src/account-removal.test.ts
@@ -0,0 +1,155 @@
+import { afterEach, describe, expect, it, vi } from 'vitest'
+import { Context } from 'cordis'
+import Database from '@cordisjs/plugin-database'
+import SQLiteDriver from '@cordisjs/plugin-database-sqlite'
+import { defineModels } from './models.js'
+import {
+  countPlatformClientAuthorizations, isLoaderManagedEntry, platformEntry, removePlatformAccount,
+  removePlatformEntry,
+} from './account-removal.js'
+
+const disposals: Array<() => Promise<void>> = []
+
+afterEach(async () => {
+  await Promise.all(disposals.splice(0).map(dispose => dispose()))
+})
+
+async function createDatabase() {
+  const ctx = new Context()
+  const fibers = [ctx.plugin(Database), ctx.plugin(SQLiteDriver, { path: ':memory:' })]
+  await Promise.all(fibers)
+  await new Promise(resolve => setTimeout(resolve, 25))
+  defineModels(ctx)
+  await ctx.database.prepared()
+  disposals.push(async () => {
+    for (const fiber of fibers.reverse()) await Promise.resolve((fiber as any).dispose?.())
+  })
+  return ctx.database
+}
+
+/** Seed one platform entry with a session, a virtual phone and one signed-in client. */
+async function seedAccount(
+  database: Awaited<ReturnType<typeof createDatabase>>,
+  platformId: string,
+  suffix: string,
+) {
+  await database.create('mtproto_platform_session', {
+    id: `session-${suffix}`, platformId, userId: `user-${suffix}`, credentials: {},
+    metadata: {}, active: true, createdAt: new Date(),
+  })
+  await database.create('mtproto_auth_session', {
+    id: `auth-${suffix}`, virtualPhone: `8880000000000${suffix}`, totpSecret: 'secret',
+    platformId, platformSessionId: `session-${suffix}`,
+  })
+  await database.create('mtproto_auth_binding', {
+    authKeyId: `key-${suffix}`, platformId, platformSessionId: `session-${suffix}`,
+  })
+  await database.create('mtproto_client_authorization', {
+    authKeyId: `key-${suffix}`, platformSessionId: `session-${suffix}`, apiId: 1,
+    deviceModel: 'device', platform: 'Android', systemVersion: '1', appName: 'Telegram',
+    appVersion: '1', dateCreated: 1, dateActive: 2, ip: '127.0.0.1', country: 'Local network',
+    region: '', encryptedRequestsDisabled: false, callRequestsDisabled: false, unconfirmed: false,
+  })
+  await database.create('mtproto_authorization_settings', {
+    platformSessionId: `session-${suffix}`, ttlDays: 180,
+  })
+}
+
+describe('platform account removal', () => {
+  it('removes one entry together with its login credentials and revokes its clients', async () => {
+    const database = await createDatabase()
+    await seedAccount(database, 'qqnt-2', '2')
+    await seedAccount(database, 'qqnt', '1')
+    const revoke = vi.fn(async () => {})
+
+    await expect(removePlatformAccount(database, 'qqnt-2', revoke)).resolves.toEqual({
+      platformSessions: 1,
+      authSessions: 1,
+      authBindings: 1,
+      clientAuthorizations: 1,
+      authorizationSettings: 1,
+    })
+    expect(revoke).toHaveBeenCalledWith(['key-2'])
+    expect(await database.get('mtproto_platform_session', { platformId: 'qqnt-2' })).toEqual([])
+    expect(await database.get('mtproto_auth_session', { platformId: 'qqnt-2' })).toEqual([])
+    expect(await database.get('mtproto_auth_binding', { platformId: 'qqnt-2' })).toEqual([])
+    expect(await database.get('mtproto_client_authorization', {})).toHaveLength(1)
+    expect(await database.get('mtproto_authorization_settings', {})).toHaveLength(1)
+    // The entry that keeps the account is untouched.
+    expect(await database.get('mtproto_auth_session', { platformId: 'qqnt' })).toHaveLength(1)
+    expect(await countPlatformClientAuthorizations(database, 'qqnt')).toBe(1)
+    expect(await countPlatformClientAuthorizations(database, 'qqnt-2')).toBe(0)
+  })
+
+  it('removes a legacy entry whose auth session points at a session row that is gone', async () => {
+    const database = await createDatabase()
+    await seedAccount(database, 'legacy', 'l')
+    await database.remove('mtproto_platform_session', { platformId: 'legacy' })
+
+    await expect(removePlatformAccount(database, 'legacy')).resolves.toMatchObject({
+      platformSessions: 0,
+      authSessions: 1,
+      clientAuthorizations: 1,
+    })
+    expect(await database.get('mtproto_auth_session', { platformId: 'legacy' })).toEqual([])
+    expect(await database.get('mtproto_client_authorization', {})).toEqual([])
+  })
+})
+
+describe('cordis entry removal', () => {
+  /** Minimal stand-in for the loader tree, keyed the way the real loader keys entries. */
+  const loader = (entries: Array<[string, string]>) => {
+    const removed: string[] = []
+    const tree = { remove: (id: string) => { removed.push(id) } }
+    return {
+      removed,
+      service: {
+        entries: () => entries.map(([id, configuredId]) => ({
+          id,
+          options: { id: configuredId },
+          parent: { tree },
+        })),
+      },
+    }
+  }
+  const context = (service?: unknown) => {
+    const ctx = new Context()
+    return {
+      ctx,
+      provide: () => ctx.provide('loader', service as never),
+    }
+  }
+
+  it('deletes the entry through the tree that owns it', () => {
+    const target = loader([['bridge01', 'bridge01'], ['qqnt-2', 'qqnt-2']])
+    const { ctx, provide } = context(target.service)
+    provide()
+    expect(isLoaderManagedEntry(ctx, 'qqnt-2')).toBe(true)
+    removePlatformEntry(ctx, 'qqnt-2')
+    // The owning tree removes entries by their configured id, not by loader key.
+    expect(target.removed).toEqual(['qqnt-2'])
+  })
+
+  it('finds an entry loaded from a config file under its qualified loader key', () => {
+    const target = loader([['7ffc5890:qqnt', 'qqnt'], ['7ffc5890:qqnt-2', 'qqnt-2']])
+    const { ctx, provide } = context(target.service)
+    provide()
+    expect(platformEntry(ctx, 'qqnt-2')?.id).toBe('7ffc5890:qqnt-2')
+    removePlatformEntry(ctx, 'qqnt')
+    expect(target.removed).toEqual(['qqnt'])
+  })
+
+  it('refuses to delete an entry the configuration file does not own', () => {
+    const { ctx, provide } = context(loader([['bridge01', 'bridge01']]).service)
+    provide()
+    expect(isLoaderManagedEntry(ctx, 'qqnt-2')).toBe(false)
+    expect(platformEntry(ctx, 'qqnt-2')).toBeUndefined()
+    expect(() => removePlatformEntry(ctx, 'qqnt-2')).toThrow(
+      '平台条目 qqnt-2 不是由配置文件管理的',
+    )
+    // A deployment without a loader keeps accounts undeletable rather than half deleted.
+    const bare = new Context()
+    expect(isLoaderManagedEntry(bare, 'qqnt-2')).toBe(false)
+    expect(() => removePlatformEntry(bare, 'qqnt-2')).toThrow('不是由配置文件管理的')
+  })
+})
diff --git a/packages/bridge/src/account-removal.ts b/packages/bridge/src/account-removal.ts
new file mode 100644
index 0000000..8dd81fb
--- /dev/null
+++ b/packages/bridge/src/account-removal.ts
@@ -0,0 +1,139 @@
+import type { Database } from '@cordisjs/plugin-database'
+import type { Context } from 'cordis'
+
+/** The Cordis configuration-tree surface the account page needs. */
+export interface PlatformEntryLoader {
+  entries(): Iterable<PlatformEntry>
+}
+export interface PlatformEntry {
+  /** Loader key, qualified with the tree path for entries inside a config file. */
+  id: string
+  options: { id: string }
+  parent: { tree: { remove(id: string): void } }
+}
+
+export interface PlatformAccountRemovalCounts {
+  platformSessions: number
+  authSessions: number
+  authBindings: number
+  clientAuthorizations: number
+  authorizationSettings: number
+}
+
+/**
+ * Loader-owned configuration tree, when this deployment keeps plugin entries in
+ * a file. Without it an entry only exists in memory, so the bridge cannot make a
+ * deletion durable and refuses instead.
+ */
+export function platformEntryLoader(ctx: Context): PlatformEntryLoader | undefined {
+  const loader = ctx.get('loader') as PlatformEntryLoader | undefined
+  return loader && typeof loader.entries === 'function' ? loader : undefined
+}
+
+/**
+ * The loader entry that provisions this platform account, if a config file owns it.
+ *
+ * A platform entry loaded from a config file reports its configured id, while the
+ * loader keys the same entry with the path of the tree that loaded it, so both
+ * spellings are accepted.
+ */
+export function platformEntry(ctx: Context, platformId: string): PlatformEntry | undefined {
+  const loader = platformEntryLoader(ctx)
+  if (!loader) return undefined
+  const entries = [...loader.entries()]
+  return entries.find(entry => entry.id === platformId)
+    ?? entries.find(entry => entry.options?.id === platformId)
+}
+
+/** Whether the Cordis loader owns this entry id and can delete it. */
+export function isLoaderManagedEntry(ctx: Context, entryId: string): boolean {
+  return platformEntry(ctx, entryId) !== undefined
+}
+
+/**
+ * Delete the plugin entry that provisions a platform account. The entry is
+ * removed through the tree that owns it, which is also the tree that writes the
+ * configuration file back, so the account cannot return on the next start.
+ */
+export function removePlatformEntry(ctx: Context, entryId: string): void {
+  const entry = platformEntry(ctx, entryId)
+  if (!entry) {
+    throw new Error(`平台条目 ${entryId} 不是由配置文件管理的，请到插件页面手动停用它。`)
+  }
+  entry.parent.tree.remove(entry.options.id)
+}
+
+/**
+ * Remove the login surface of one platform entry: the platform session, its
+ * virtual phone, TOTP secret and two-step password, the bindings of every
+ * Telegram client signed in through it, and their authorizations.
+ *
+ * Message and conversation history is deliberately left alone: it is scoped by
+ * platform session, so it is unreachable once the session is gone, while the
+ * identity rows stay reusable if the same entry id is configured again.
+ */
+export async function removePlatformAccount(
+  database: Database,
+  platformId: string,
+  revokeAuthKeys: (authKeyIds: string[]) => Promise<void> = async () => {},
+): Promise<PlatformAccountRemovalCounts> {
+  await database.prepared()
+  const [sessions, authSessions, bindings] = await Promise.all([
+    database.get('mtproto_platform_session', { platformId }),
+    database.get('mtproto_auth_session', { platformId }),
+    database.get('mtproto_auth_binding', { platformId }),
+  ])
+  const platformSessionIds = [...new Set([
+    ...sessions.map(session => session.id),
+    ...authSessions.map(auth => auth.platformSessionId),
+  ])]
+  let clientAuthorizations = 0
+  let authorizationSettings = 0
+  for (const platformSessionId of platformSessionIds) {
+    const [clients, settings] = await Promise.all([
+      database.get('mtproto_client_authorization', { platformSessionId }),
+      database.get('mtproto_authorization_settings', { platformSessionId }),
+    ])
+    clientAuthorizations += clients.length
+    authorizationSettings += settings.length
+    await Promise.all([
+      database.remove('mtproto_client_authorization', { platformSessionId }),
+      database.remove('mtproto_authorization_settings', { platformSessionId }),
+    ])
+  }
+  await Promise.all([
+    database.remove('mtproto_auth_binding', { platformId }),
+    database.remove('mtproto_auth_session', { platformId }),
+    database.remove('mtproto_platform_session', { platformId }),
+  ])
+  // Revoke after the rows are gone, so a client cannot re-authorize in between.
+  await revokeAuthKeys(bindings.map(binding => binding.authKeyId))
+  return {
+    platformSessions: sessions.length,
+    authSessions: authSessions.length,
+    authBindings: bindings.length,
+    clientAuthorizations,
+    authorizationSettings,
+  }
+}
+
+/** Telegram clients signed in through one platform entry. */
+export async function countPlatformClientAuthorizations(
+  database: Database,
+  platformId: string,
+): Promise<number> {
+  await database.prepared()
+  const [sessions, authSessions] = await Promise.all([
+    database.get('mtproto_platform_session', { platformId }),
+    database.get('mtproto_auth_session', { platformId }),
+  ])
+  const platformSessionIds = [...new Set([
+    ...sessions.map(session => session.id),
+    ...authSessions.map(auth => auth.platformSessionId),
+  ])]
+  let count = 0
+  for (const platformSessionId of platformSessionIds) {
+    count += (await database.get('mtproto_client_authorization', { platformSessionId })).length
+  }
+  return count
+}
diff --git a/packages/bridge/src/dashboard-types.ts b/packages/bridge/src/dashboard-types.ts
index 9bedef8..4beb957 100644
--- a/packages/bridge/src/dashboard-types.ts
+++ b/packages/bridge/src/dashboard-types.ts
@@ -26,6 +26,44 @@ export interface CrossGramServerConfigDc {
   port: number
 }
 
+/** One `host:port` a copied server configuration can point at. */
+export interface PlatformAccountServerEndpoint {
+  host: string
+  port: number
+  /** The endpoint the bridge advertises first; also the default selection for a copy. */
+  primary: boolean
+}
+
+/** One platform entry that describes the same platform account as another entry. */
+export interface PlatformAccountDuplicateGroup {
+  /** Entry that keeps the account. */
+  keep: string
+  /** Entries that duplicate `keep`. */
+  remove: string[]
+  /**
+   * `identity`: both entries resolve to the same platform user.
+   * `virtual-phone`: the entry lost its deterministic virtual phone to `keep`.
+   */
+  reason: 'identity' | 'virtual-phone'
+}
+
+/** What deleting one platform entry removes, resolved before the confirmation. */
+export interface PlatformAccountRemovalTarget {
+  platformId: string
+  platformKind: string
+  displayName?: string
+  /** Telegram clients signed in through the entry; deleting it signs them out. */
+  clientAuthorizations: number
+  /** Whether the Cordis loader owns the entry, so the bridge can delete it. */
+  managed: boolean
+}
+
+export interface PlatformAccountRemovalPreview {
+  targets: PlatformAccountRemovalTarget[]
+  /** Sum of `targets[].clientAuthorizations`. */
+  clientAuthorizations: number
+}
+
 export interface CrossGramServerConfig {
   name: 'CrossGram'
   enable_special_config: false
@@ -38,11 +76,21 @@ export interface CrossGramServerConfig {
 export interface PlatformAccountDashboardData {
   accounts: PlatformAccountView[]
   serverConfig: CrossGramServerConfig
+  /** Endpoints `serverConfig` can be copied for; the primary entry comes first. */
+  serverEndpoints: PlatformAccountServerEndpoint[]
   loginTokenApprovalUrl: string
   updatedAt: number
   refresh(): Promise<void>
   /** Set, replace, or clear (null/empty) the two-step verification password. */
   setLoginPassword(platformId: string, password: string | null): Promise<void>
+  /** Platform entries that describe the same platform account as another entry. */
+  findDuplicateAccounts(): Promise<PlatformAccountDuplicateGroup[]>
+  /** Resolve what deleting these entries would remove, before the confirmation. */
+  describeAccountRemoval(
+    platformIds: string[],
+  ): Promise<PlatformAccountRemovalPreview>
+  /** Delete platform entries together with every login credential they own. */
+  deleteAccounts(platformIds: string[]): Promise<void>
 }
 
 export interface StickerDashboardAccount {
diff --git a/packages/bridge/src/index.ts b/packages/bridge/src/index.ts
index 9953de4..8b0a6dd 100644
--- a/packages/bridge/src/index.ts
+++ b/packages/bridge/src/index.ts
@@ -29,7 +29,8 @@ import { StickerRpc } from './sticker-rpc.js'
 import { ReactionRpc } from './reaction-rpc.js'
 import { TelegramResourceService } from './resource-provider.js'
 import {
-  migrateLegacyVirtualPhones, PlatformAccountProvisioner, type ProvisionedPlatformAccount,
+  migrateLegacyVirtualPhones, PlatformAccountProvisioner, VirtualPhoneClaimedError,
+  type ProvisionedPlatformAccount,
 } from './platform-account.js'
 import { verifyLoginCode } from './login-code.js'
 import {
@@ -38,9 +39,14 @@ import {
 import { DraftStore } from './draft-store.js'
 import { NotificationSettingsStore } from './notification-settings.js'
 import {
-  makeCrossGramServerConfig, makePlatformAccountView, makeUnavailableAccountView,
+  makeCrossGramServerConfig, makePlatformAccountView, makeServerEndpoints, makeUnavailableAccountView,
   type PlatformAccountDashboardData,
 } from './account-dashboard.js'
+import type { PlatformAccountRemovalTarget } from './dashboard-types.js'
+import { findDuplicateAccounts, type PlatformAccountDuplicateCandidate } from './account-duplicates.js'
+import {
+  countPlatformClientAuthorizations, isLoaderManagedEntry, removePlatformAccount, removePlatformEntry,
+} from './account-removal.js'
 import { AuthTransferStore } from './auth-transfer.js'
 import {
   LoginTokenStore, LoginTokenStoreFullError, LoginTokenSourceLimitError, parseTelegramLoginToken,
@@ -251,6 +257,18 @@ export function apply(ctx: Context, config: BridgeConfig = {}): void {
     (authKeyId, originConnection) => ctx.mtproto.beginAuthKeyRevocation(authKeyId, originConnection),
     authKeyId => ctx.mtproto.finishAuthKeyRevocation(authKeyId),
   )
+  // Deleting a platform account signs out every client that logged in through
+  // it. Revocation is best effort after the rows are gone, so one stuck key can
+  // never keep a deleted account around.
+  const revokeBoundClients = async (authKeyIds: string[]): Promise<void> => {
+    for (const authKeyId of authKeyIds) {
+      try {
+        await ctx.mtproto.revokeAuthKey(new Uint8Array(Buffer.from(authKeyId, 'hex')))
+      } catch (error) {
+        bridgeLogger.warn('failed to revoke authorization of a deleted account (%s): %s', authKeyId, String(error))
+      }
+    }
+  }
   const store = new MessageStore(ctx.database, undefined, ctx.updateStore, historyTrace, messageProjection)
   const drafts = new DraftStore(ctx.database)
   const notificationSettings = new NotificationSettingsStore(
@@ -545,6 +563,9 @@ export function apply(ctx: Context, config: BridgeConfig = {}): void {
     serverConfig: makeCrossGramServerConfig(
       config.serverHost ?? '127.0.0.1', config.serverPort ?? 4430, ctx.mtproto.rsaKey.publicKeyPem,
     ),
+    serverEndpoints: makeServerEndpoints(
+      config.serverHost ?? '127.0.0.1', config.serverPort ?? 4430, config.altEndpoints,
+    ),
     loginTokenApprovalUrl: `${apiPrefix}/login-tokens`,
     updatedAt: Date.now(),
     stickerAccounts: [],
@@ -566,6 +587,72 @@ export function apply(ctx: Context, config: BridgeConfig = {}): void {
     async refreshBots() {
       await publishBots()
     },
+    async findDuplicateAccounts() {
+      await ctx.database.prepared()
+      const candidates = await Promise.all([...registry.ids].sort().map(
+        async (platformId): Promise<PlatformAccountDuplicateCandidate> => {
+          const platform = registry.get(platformId)
+          const error = accountErrors.get(platformId)
+          return {
+            platformId,
+            platformKind: platform?.platformKind ?? platformId,
+            userId: provisionedAccounts.get(platformId)?.profile.id,
+            claimedBy: error instanceof VirtualPhoneClaimedError ? error.ownerPlatformId : undefined,
+            clientAuthorizations: await countPlatformClientAuthorizations(ctx.database, platformId),
+          }
+        },
+      ))
+      return findDuplicateAccounts(candidates)
+    },
+    async describeAccountRemoval(platformIds) {
+      await ctx.database.prepared()
+      const requested = normalizePlatformIds(platformIds)
+      const targets: PlatformAccountRemovalTarget[] = []
+      for (const platformId of requested) {
+        const platform = registry.get(platformId)
+        const account = provisionedAccounts.get(platformId)
+        targets.push({
+          platformId,
+          platformKind: platform?.platformKind ?? platformId,
+          displayName: account
+            ? [account.profile.firstName, account.profile.lastName].filter(Boolean).join(' ')
+              || account.profile.username
+            : undefined,
+          clientAuthorizations: await countPlatformClientAuthorizations(ctx.database, platformId),
+          managed: isLoaderManagedEntry(ctx, platformId),
+        })
+      }
+      return {
+        targets,
+        clientAuthorizations: targets.reduce((total, target) => total + target.clientAuthorizations, 0),
+      }
+    },
+    async deleteAccounts(platformIds) {
+      await ctx.database.prepared()
+      const requested = normalizePlatformIds(platformIds)
+      if (!requested.length) throw new Error('没有选择要删除的账号。')
+      // Validate every entry before removing anything, so an unmanaged entry can
+      // never leave the configuration half deleted.
+      for (const platformId of requested) {
+        if (!registry.get(platformId)) throw new Error(`平台条目不存在：${platformId}，请刷新后重试。`)
+        if (!isLoaderManagedEntry(ctx, platformId)) {
+          throw new Error(`平台条目 ${platformId} 不是由配置文件管理的，请到插件页面手动停用它。`)
+        }
+      }
+      for (const platformId of requested) {
+        const platform = registry.require(platformId)
+        platforms.deactivateSession(platformId, platform)
+        await subscriptions.stopPlatform(platformId)
+        await removePlatformAccount(ctx.database, platformId, revokeBoundClients)
+        provisionedAccounts.delete(platformId)
+        accountErrors.delete(platformId)
+        // Removing the entry unregisters the adapter, so provisioning cannot
+        // recreate the account, and the plugin list stays in sync with app.yml.
+        removePlatformEntry(ctx, platformId)
+      }
+      publishAccounts()
+      await publishStickerPacks()
+    },
     async setStickerPackAssigned(platformSessionId, providerId, packId, assigned) {
       const pack = publishedStickerPacks.find((item) =>
         item.providerId === providerId && item.packId === packId)
@@ -1458,6 +1545,13 @@ function normPhone(p: string): string {
   return p.replace(/\D/g, '')
 }
 
+/** Deduplicate requested platform entry ids; the browser may repeat them across sections. */
+function normalizePlatformIds(platformIds: readonly string[]): string[] {
+  return [...new Set(platformIds.filter(
+    (platformId): platformId is string => typeof platformId === 'string' && platformId.length > 0,
+  ))]
+}
+
 /** Completes a new authorization only after its binding can receive transient replays. */
 export async function finalizeAuthorizedSession(
   rpc: ServerRpcContext,
diff --git a/packages/bridge/src/platform-account.ts b/packages/bridge/src/platform-account.ts
index e5065aa..6e2e662 100644
--- a/packages/bridge/src/platform-account.ts
+++ b/packages/bridge/src/platform-account.ts
@@ -157,9 +157,24 @@ async function allocateVirtualPhone(database: Database): Promise<string> {
   throw new Error('failed to allocate a unique virtual phone')
 }
 
+/**
+ * Raised when a platform entry cannot own the virtual phone its identity maps
+ * to because another entry already serves it. The account page uses this to
+ * name the entry that owns the account and to offer deleting the duplicate.
+ */
+export class VirtualPhoneClaimedError extends Error {
+  constructor(
+    readonly virtualPhone: string,
+    readonly ownerPlatformId: string,
+  ) {
+    super(`virtual phone +${virtualPhone} is already assigned to platform entry "${ownerPlatformId}"`)
+    this.name = 'VirtualPhoneClaimedError'
+  }
+}
+
 async function ensureVirtualPhoneAvailable(database: Database, virtualPhone: string, authId?: string): Promise<void> {
   const owner = (await database.get('mtproto_auth_session', { virtualPhone })).find(auth => auth.id !== authId)
-  if (owner) throw new Error(`QQ virtual phone ${virtualPhone} is already assigned to another auth session`)
+  if (owner) throw new VirtualPhoneClaimedError(virtualPhone, owner.platformId)
 }
 
 function qqVirtualPhone(user: IMUser): string {
diff --git a/packages/cordis-webui-solidjs/client/pages/crossgram-components.test.tsx b/packages/cordis-webui-solidjs/client/pages/crossgram-components.test.tsx
index 7b866da..ac11762 100644
--- a/packages/cordis-webui-solidjs/client/pages/crossgram-components.test.tsx
+++ b/packages/cordis-webui-solidjs/client/pages/crossgram-components.test.tsx
@@ -31,7 +31,15 @@ describe('bounded Crossgram components', () => {
         validUntil: 3000,
       })
     const root = mount(() => (
-      <AccountCard account={account()} now={now()} connected setPassword={async () => {}} />
+      <AccountCard
+        account={account()}
+        now={now()}
+        connected
+        selected={false}
+        onSelect={() => {}}
+        onDelete={() => {}}
+        setPassword={async () => {}}
+      />
     ))
     const card = root.querySelector('article')!,
       copy = root.querySelector(
@@ -47,6 +55,42 @@ describe('bounded Crossgram components', () => {
     expect(copy.disabled).toBe(true)
     expect(copy.textContent).toBe('------')
   })
+  it('selects and marks a duplicate card without disturbing the account card itself', () => {
+    const selected: boolean[] = []
+    const [marker, setMarker] = createSignal<string | undefined>(undefined)
+    const root = mount(() => (
+      <AccountCard
+        account={{
+          platformId: 'qqnt-2',
+          platformKind: 'QQ',
+          status: 'error',
+          error: 'virtual phone is already assigned',
+        }}
+        now={0}
+        connected
+        selected={marker() === 'selected'}
+        duplicateOf={marker() === 'duplicate' ? 'qqnt' : undefined}
+        onSelect={(value) => selected.push(value)}
+        onDelete={() => {}}
+        setPassword={async () => {}}
+      />
+    ))
+    const checkbox = root.querySelector<HTMLInputElement>(
+      '[aria-label="Select qqnt-2"]',
+    )!
+    checkbox.checked = true
+    checkbox.dispatchEvent(new Event('change', { bubbles: true }))
+    expect(selected).toEqual([true])
+    expect(root.querySelector('[data-duplicate-of]')).toBeNull()
+    setMarker('duplicate')
+    expect(root.querySelector('[data-duplicate-of]')?.textContent).toContain(
+      'Duplicate of qqnt',
+    )
+    expect(
+      root.querySelector<HTMLButtonElement>('[aria-label="Delete qqnt-2"]')
+        ?.textContent,
+    ).toBe('Delete account')
+  })
   it('renders only one page of large statistics tables and reuses table rows across live snapshots', () => {
     const [rows, setRows] = createSignal(
       Array.from({ length: 5000 }, (_, index) => ({
diff --git a/packages/cordis-webui-solidjs/src/bridge.browser.e2e.test.ts b/packages/cordis-webui-solidjs/src/bridge.browser.e2e.test.ts
index f107a81..9301cf3 100644
--- a/packages/cordis-webui-solidjs/src/bridge.browser.e2e.test.ts
+++ b/packages/cordis-webui-solidjs/src/bridge.browser.e2e.test.ts
@@ -11,6 +11,7 @@ import {
   LoginTokenStore,
   parseTelegramLoginToken,
 } from '../../bridge/src/login-token.js'
+import { findDuplicateAccounts } from '../../bridge/src/account-duplicates.js'
 import SolidWebUI from './index.js'
 describe('Crossgram accounts, stickers and bots in the Solid shell', () => {
   it('keeps identity cards stable, decodes QR in a worker, requires explicit account approval and manages sticker/bot pages on a phone', async () => {
@@ -32,7 +33,9 @@ describe('Crossgram accounts, stickers and bots in the Solid shell', () => {
       const tokenUrl =
           'tg://login?token=' + Buffer.from(issued).toString('base64url'),
         approvals: unknown[] = [],
-        assignments: unknown[][] = []
+        assignments: unknown[][] = [],
+        described: string[][] = [],
+        removed: string[][] = []
       ctx.server.post('/bridge/login-tokens/:platform/approve', async (req) => {
         const body = await req.json(),
           token = parseTelegramLoginToken(body.token)
@@ -76,15 +79,33 @@ describe('Crossgram accounts, stickers and bots in the Solid shell', () => {
             status: 'error',
             error: 'Platform disconnected',
           },
+          {
+            // A second QQ entry that could not claim the virtual phone of `qq-main`
+            // carries no profile, exactly like the backend error projection.
+            platformId: 'qq-duplicate',
+            platformKind: 'QQ',
+            status: 'error',
+            userId: '12345',
+            virtualPhone: '+888123456789',
+            error: 'virtual phone is already assigned to platform entry',
+          },
         ],
         serverConfig: {
           name: 'CrossGram',
           enable_special_config: false,
           host: 'example.test',
           port: 4430,
-          rsa_key: 'PUBLIC_TEST_KEY',
-          dcs: [],
+          rsa_key:
+            '-----BEGIN RSA PUBLIC KEY-----\nPUBLIC_TEST_KEY\n-----END RSA PUBLIC KEY-----',
+          dcs: [
+            { id: 1, ip: 'example.test', port: 4430 },
+            { id: 2, ip: 'example.test', port: 4430 },
+          ],
         },
+        serverEndpoints: [
+          { host: 'example.test', port: 4430, primary: true },
+          { host: 'backup.test', port: 8443, primary: false },
+        ],
         loginTokenApprovalUrl: '/bridge/login-tokens',
         updatedAt: Date.now(),
         stickerAccounts: [
@@ -139,6 +160,52 @@ describe('Crossgram accounts, stickers and bots in the Solid shell', () => {
         async refreshBots() {},
         async refreshStickerPacks() {},
         async setLoginPassword() {},
+        async findDuplicateAccounts() {
+          return findDuplicateAccounts(
+            data.accounts.map((account) => ({
+              platformId: account.platformId,
+              platformKind: account.platformKind,
+              userId: account.userId,
+              clientAuthorizations:
+                account.platformId === 'qq-main'
+                  ? 2
+                  : account.platformId === 'matrix-alt'
+                    ? 1
+                    : 0,
+            })),
+          )
+        },
+        async describeAccountRemoval(platformIds) {
+          described.push(platformIds)
+          return {
+            targets: platformIds.map((platformId) => ({
+              platformId,
+              platformKind:
+                data.accounts.find((account) => account.platformId === platformId)
+                  ?.platformKind ?? 'unknown',
+              displayName: data.accounts.find(
+                (account) => account.platformId === platformId,
+              )?.displayName,
+              clientAuthorizations:
+                platformId === 'qq-main' ? 2 : platformId === 'matrix-alt' ? 1 : 0,
+              managed: platformId !== 'offline',
+            })),
+            clientAuthorizations: platformIds.reduce(
+              (total, platformId) =>
+                total +
+                (platformId === 'qq-main' ? 2 : platformId === 'matrix-alt' ? 1 : 0),
+              0,
+            ),
+          }
+        },
+        async deleteAccounts(platformIds) {
+          removed.push(platformIds)
+          entry.mutate((value) => {
+            value.accounts = value.accounts.filter(
+              (account) => !platformIds.includes(account.platformId),
+            )
+          })
+        },
         async setStickerPackAssigned(account, provider, pack, assigned) {
           assignments.push([account, provider, pack, assigned])
           entry.mutate((value) => {
@@ -237,9 +304,64 @@ describe('Crossgram accounts, stickers and bots in the Solid shell', () => {
       await page
         .getByRole('button', { name: 'Copy server configuration', exact: true })
         .click()
-      expect(
-        JSON.parse(await page.evaluate(() => navigator.clipboard.readText())),
-      ).toMatchObject({ host: 'example.test', rsa_key: 'PUBLIC_TEST_KEY' })
+      const copiedConfiguration = await page.evaluate(() =>
+        navigator.clipboard.readText(),
+      )
+      expect(JSON.parse(copiedConfiguration)).toEqual(data.serverConfig)
+      expect(copiedConfiguration).toContain('PUBLIC_TEST_KEY')
+      // Phones open the console over plain http, where navigator.clipboard is missing and
+      // copyText falls back to a hidden textarea; that path must produce the same document.
+      await page.evaluate(() =>
+        Object.defineProperty(navigator.clipboard, 'writeText', {
+          value: undefined,
+          configurable: true,
+        }),
+      )
+      await page
+        .getByRole('button', { name: 'Configuration copied', exact: true })
+        .click()
+      expect(await page.evaluate(() => navigator.clipboard.readText())).toBe(
+        copiedConfiguration,
+      )
+      // The clipboard and the readable document on the page are the same configuration.
+      const displayedConfiguration = await page
+        .getByLabel('Server configuration')
+        .textContent()
+      expect(JSON.parse(displayedConfiguration!)).toEqual(
+        JSON.parse(copiedConfiguration),
+      )
+      // Copying for another endpoint only rewrites host/port, so a reader who needs
+      // the backup address does not have to edit the pasted document by hand. The
+      // mobile fallback path above is still active, so this covers it as well.
+      const endpointPicker = page.getByLabel('Copy endpoint')
+      expect(await endpointPicker.inputValue()).toBe('example.test:4430')
+      await page
+        .getByRole('button', { name: 'Configuration copied', exact: true })
+        .click()
+      expect(await page.evaluate(() => navigator.clipboard.readText())).toBe(
+        copiedConfiguration,
+      )
+      await endpointPicker.selectOption('backup.test:8443')
+      expect(await page.getByLabel('Server configuration').textContent()).toContain(
+        '"host": "backup.test"',
+      )
+      await page
+        .getByRole('button', { name: 'Configuration copied', exact: true })
+        .click()
+      const alternateConfiguration = await page.evaluate(() =>
+        navigator.clipboard.readText(),
+      )
+      expect(JSON.parse(alternateConfiguration)).toEqual({
+        ...data.serverConfig,
+        host: 'backup.test',
+        port: 8443,
+        dcs: data.serverConfig.dcs.map((dc) => ({
+          ...dc,
+          ip: 'backup.test',
+          port: 8443,
+        })),
+      })
+      await endpointPicker.selectOption('example.test:4430')
       await page
         .getByRole('button', { name: 'Approve QR login', exact: true })
         .click()
@@ -340,6 +462,95 @@ describe('Crossgram accounts, stickers and bots in the Solid shell', () => {
       await page
         .getByRole('heading', { name: 'Primary account', exact: true })
         .waitFor()
+
+      // Duplicate entries are reported by the backend with the entry that owns the
+      // account, so the reader can see what would go before selecting anything.
+      const duplicates = page.locator('[data-duplicates]')
+      await duplicates.getByText('1 duplicate account', { exact: true }).waitFor()
+      expect(await duplicates.textContent()).toContain(
+        'qq-duplicate duplicates qq-main',
+      )
+      const duplicateCard = page.locator('[data-platform="qq-duplicate"]')
+      expect(
+        await duplicateCard.locator('[data-duplicate-of]').textContent(),
+      ).toContain('Duplicate of qq-main')
+      if (process.env.WEBUI_SCREENSHOTS) {
+        await mkdir(process.env.WEBUI_SCREENSHOTS, { recursive: true })
+        await page.screenshot({
+          path: join(
+            process.env.WEBUI_SCREENSHOTS,
+            'accounts-duplicates-mobile.png',
+          ),
+          fullPage: true,
+          animations: 'disabled',
+        })
+      }
+
+      // An entry the configuration file does not own cannot be deleted, and the
+      // dialog says so instead of dropping the entry from the runtime only.
+      await page.getByRole('button', { name: 'Delete offline', exact: true }).click()
+      const unmanagedDialog = page.getByRole('dialog', {
+        name: 'Delete platform accounts',
+      })
+      await unmanagedDialog.getByText('offline is not managed by').waitFor()
+      expect(
+        await unmanagedDialog
+          .getByRole('button', { name: 'Delete accounts', exact: true })
+          .isDisabled(),
+      ).toBe(true)
+      await unmanagedDialog
+        .getByRole('button', { name: 'Cancel', exact: true })
+        .click()
+
+      // Deleting an account clients are signed in through is confirmed with the
+      // exact number of sessions that lose access.
+      await page
+        .getByRole('button', { name: 'Delete qq-main', exact: true })
+        .click()
+      const inUseDialog = page.getByRole('dialog', {
+        name: 'Delete platform accounts',
+      })
+      await inUseDialog
+        .getByText(/2 Telegram clients signed in through the selected entries will be signed out\./)
+        .waitFor()
+      await inUseDialog
+        .getByRole('button', { name: 'Cancel', exact: true })
+        .click()
+
+      await page
+        .getByRole('button', { name: 'Select duplicates', exact: true })
+        .click()
+      await page.getByText('1 selected', { exact: true }).waitFor()
+      expect(
+        await page
+          .getByRole('checkbox', { name: 'Select qq-duplicate', exact: true })
+          .isChecked(),
+      ).toBe(true)
+      await page
+        .getByRole('button', { name: 'Delete selected', exact: true })
+        .click()
+      const deleteDialog = page.getByRole('dialog', {
+        name: 'Delete platform accounts',
+      })
+      await deleteDialog.getByText('qq-duplicate', { exact: false }).first().waitFor()
+      if (process.env.WEBUI_SCREENSHOTS) {
+        await page.screenshot({
+          path: join(
+            process.env.WEBUI_SCREENSHOTS,
+            'accounts-delete-confirm-mobile.png',
+          ),
+          animations: 'disabled',
+        })
+      }
+      await deleteDialog
+        .getByRole('button', { name: 'Delete accounts', exact: true })
+        .click()
+      await page.locator('[data-platform="qq-duplicate"]').waitFor({ state: 'detached' })
+      await duplicates.waitFor({ state: 'detached' })
+      expect(removed).toEqual([['qq-duplicate']])
+      expect(described).toContainEqual(['qq-duplicate'])
+      expect(await page.locator('.identity-card').count()).toBe(3)
+
       if (process.env.WEBUI_SCREENSHOTS) {
         await mkdir(process.env.WEBUI_SCREENSHOTS, { recursive: true })
         await page.screenshot({
@@ -359,6 +570,32 @@ describe('Crossgram accounts, stickers and bots in the Solid shell', () => {
           fullPage: true,
           animations: 'disabled',
         })
+        // A native <select> popup cannot be captured by Chromium, so the endpoint
+        // picker is documented with the main endpoint selected and then with the
+        // backup endpoint selected next to the document it produces.
+        await page.evaluate(() => scrollTo(0, 0))
+        await page
+          .locator('.connection-config')
+          .screenshot({
+            path: join(
+              process.env.WEBUI_SCREENSHOTS,
+              'accounts-endpoint-main-desktop.png',
+            ),
+            animations: 'disabled',
+          })
+        await page.getByLabel('Copy endpoint').selectOption('backup.test:8443')
+        await page
+          .locator('.connection-config details')
+          .evaluate((details) => details.setAttribute('open', 'open'))
+        await page
+          .locator('.connection-config')
+          .screenshot({
+            path: join(
+              process.env.WEBUI_SCREENSHOTS,
+              'accounts-endpoint-backup-desktop.png',
+            ),
+            animations: 'disabled',
+          })
       }
       expect(errors).toEqual([])
       entry.dispose()