diff --git a/client/src/pages/admin/AdminUsersTab.test.tsx b/client/src/pages/admin/AdminUsersTab.test.tsx
index 3e870a96e..2471924bf 100644
--- a/client/src/pages/admin/AdminUsersTab.test.tsx
+++ b/client/src/pages/admin/AdminUsersTab.test.tsx
@@ -102,6 +102,15 @@ describe('AdminUsersTab', () => {
     expect(screen.getByText('A')).toBeInTheDocument();
   });
 
+  it('FE-ADMUSR-006b: the column shows the last activity, not only the last sign-in', () => {
+    renderTab({
+      users: [buildAdminUser({ id: 5, username: 'busy', last_login: '2025-06-01T10:30:00.000Z', last_active: '2025-06-09T18:00:00.000Z' })],
+    });
+
+    expect(screen.getByRole('columnheader', { name: 'Last Active' })).toBeInTheDocument();
+    expect(screen.getByText(/9 Jun|Jun 9/)).toBeInTheDocument();
+  });
+
   it('FE-ADMUSR-006: renders an em dash when the user never logged in', () => {
     renderTab({ users: [buildAdminUser({ id: 4, username: 'never', last_login: null })] });
 
diff --git a/client/src/pages/admin/AdminUsersTab.tsx b/client/src/pages/admin/AdminUsersTab.tsx
index 73400c5ad..b31b3c4f2 100644
--- a/client/src/pages/admin/AdminUsersTab.tsx
+++ b/client/src/pages/admin/AdminUsersTab.tsx
@@ -9,7 +9,7 @@ import { EditorField, Segmented } from '../../components/shared/dialogParts'
 import { SettingsCard, SettingRows, SettingsHint, StatusPill, SETTINGS_BUTTON, SETTINGS_BUTTON_PRIMARY, SETTINGS_ICON_BUTTON } from '../../components/Settings/settingsKit'
 import type { TranslationFn } from '../../types'
 import type { useAdmin } from './useAdmin'
-import { inviteStatus } from './adminModel'
+import { formatLastActive, inviteStatus } from './adminModel'
 
 interface AdminUsersTabProps {
   admin: ReturnType<typeof useAdmin>
@@ -73,7 +73,7 @@ export default function AdminUsersTab({ admin, t, locale }: AdminUsersTabProps):
                   <th className={TH}>{t('admin.table.email')}</th>
                   <th className={TH}>{t('admin.table.role')}</th>
                   <th className={TH}>{t('admin.table.created')}</th>
-                  <th className={TH}>{t('admin.table.lastLogin')}</th>
+                  <th className={TH}>{t('admin.table.lastActive')}</th>
                   <th className={`${TH} text-end`}>{t('admin.table.actions')}</th>
                 </tr>
               </thead>
@@ -114,7 +114,8 @@ export default function AdminUsersTab({ admin, t, locale }: AdminUsersTabProps):
                         {new Date(u.created_at).toLocaleDateString(locale)}
                       </td>
                       <td className={`${TD} whitespace-nowrap font-geist tabular-nums text-content-muted`} style={fs(12)}>
-                        {u.last_login ? new Date(u.last_login).toLocaleDateString(locale, { day: 'numeric', month: 'short', hour: '2-digit', minute: '2-digit', hour12 }) : '—'}
+                        {/* Activity, not only sign-ins: a renewing cookie keeps people signed in for weeks. */}
+                        {formatLastActive(u.last_active ?? u.last_login, locale, hour12)}
                       </td>
                       <td className={TD}>
                         <div className="flex items-center justify-end gap-1.5">
diff --git a/client/src/pages/admin/adminModel.test.ts b/client/src/pages/admin/adminModel.test.ts
index 36397cdb1..ef0514977 100644
--- a/client/src/pages/admin/adminModel.test.ts
+++ b/client/src/pages/admin/adminModel.test.ts
@@ -1,7 +1,7 @@
-// FE-ADMMODEL-001 to -005: the invite status both admin user views show.
+// FE-ADMMODEL-001 to -005: the invite status both admin user views show; -010 to -012 the users list.
 import { describe, expect, it } from 'vitest';
 
-import { inviteStatus } from './adminModel';
+import { formatLastActive, inviteStatus, mergeSavedUser, type AdminUser } from './adminModel';
 
 const NOW = new Date('2026-10-09T12:00:00Z');
 
@@ -47,3 +47,40 @@ describe('inviteStatus', () => {
     expect(inviteStatus({ expires_at: '2999-01-01T00:00:00Z', max_uses: 0, used_count: 0 }).isActive).toBe(true);
   });
 });
+
+describe('formatLastActive', () => {
+  it('FE-ADMMODEL-010: a dash for never, the year only once it is not this one', () => {
+    expect(formatLastActive(null, 'en-GB', false, NOW)).toBe('—');
+    const thisYear = formatLastActive('2026-03-04T10:30:00Z', 'en-GB', false, NOW);
+    const lastYear = formatLastActive('2025-03-04T10:30:00Z', 'en-GB', false, NOW);
+    expect(thisYear).not.toContain('2026');
+    expect(lastYear).toContain('2025');
+  });
+
+  it('FE-ADMMODEL-011: follows the 12 and 24 hour setting', () => {
+    expect(formatLastActive('2026-03-04T15:30:00Z', 'en-US', true, NOW)).toMatch(/PM/i);
+    expect(formatLastActive('2026-03-04T15:30:00Z', 'en-US', false, NOW)).not.toMatch(/PM/i);
+  });
+});
+
+describe('mergeSavedUser', () => {
+  it('FE-ADMMODEL-012: takes the account fields from the reply and keeps the rest of the row', () => {
+    const row: AdminUser = {
+      id: 2,
+      username: 'old',
+      email: 'old@e.com',
+      role: 'user',
+      created_at: '2026-01-01T00:00:00Z',
+      last_login: '2026-10-01T08:00:00Z',
+      last_active: '2026-10-08T17:30:00Z',
+      online: true,
+      avatar_url: '/a.jpg',
+    };
+    expect(mergeSavedUser(row, { username: 'new', email: 'new@e.com', role: 'admin' })).toEqual({
+      ...row,
+      username: 'new',
+      email: 'new@e.com',
+      role: 'admin',
+    });
+  });
+});
diff --git a/client/src/pages/admin/adminModel.ts b/client/src/pages/admin/adminModel.ts
index 1a70efc18..5f6e87c42 100644
--- a/client/src/pages/admin/adminModel.ts
+++ b/client/src/pages/admin/adminModel.ts
@@ -7,11 +7,37 @@ export interface AdminUser {
   role: 'admin' | 'user'
   created_at: string
   last_login?: string | null
+  /** The later of the last sign-in and the last request the account made. */
+  last_active?: string | null
   online?: boolean
   oidc_issuer?: string | null
   avatar_url?: string | null
 }
 
+/**
+ * The row after an edit. The update answers with the account fields only, so
+ * what the list derives (avatar, last activity, online) stays from the row; a
+ * reply that replaced the whole row showed the user as never signed in.
+ */
+export function mergeSavedUser(row: AdminUser, saved: Pick<AdminUser, 'username' | 'email' | 'role'>): AdminUser {
+  return { ...row, username: saved.username, email: saved.email, role: saved.role }
+}
+
+/** When a user was last active, with the year once it is not this one. */
+export function formatLastActive(iso: string | null | undefined, locale: string, hour12: boolean, now = new Date()): string {
+  if (!iso) return '—'
+  const at = new Date(iso)
+  const sameYear = at.getFullYear() === now.getFullYear()
+  return at.toLocaleDateString(locale, {
+    day: 'numeric',
+    month: 'short',
+    ...(sameYear ? {} : { year: 'numeric' }),
+    hour: '2-digit',
+    minute: '2-digit',
+    hour12,
+  })
+}
+
 export interface AdminStats {
   totalUsers: number
   totalTrips: number
diff --git a/client/src/pages/admin/useAdmin.test.tsx b/client/src/pages/admin/useAdmin.test.tsx
index 747bc8d3c..02fac79d1 100644
--- a/client/src/pages/admin/useAdmin.test.tsx
+++ b/client/src/pages/admin/useAdmin.test.tsx
@@ -701,6 +701,49 @@ describe('useAdmin', () => {
     expect(toastCalls).toContainEqual({ type: 'success', message: 'User updated' });
   });
 
+  it('FE-ADMHOOK-036d: the open users tab asks again who is online, without the spinner', async () => {
+    const ticks: Array<() => void> = [];
+    const spy = vi.spyOn(window, 'setInterval').mockImplementation(((fn: () => void) => {
+      ticks.push(fn);
+      return 0;
+    }) as unknown as typeof window.setInterval);
+    try {
+      const { result } = await mountAdmin();
+      expect(result.current.users[1].online).not.toBe(true);
+      server.use(http.get('/api/admin/users', () => HttpResponse.json({ users: [me, { ...alice, online: true }] })));
+      await act(async () => {
+        ticks.forEach((tick) => tick());
+      });
+      await waitFor(() => expect(result.current.users[1].online).toBe(true));
+      expect(result.current.isLoading).toBe(false);
+    } finally {
+      spy.mockRestore();
+    }
+  });
+
+  it('FE-ADMHOOK-036c: a saved row keeps what the list derives (avatar, activity, online)', async () => {
+    server.use(
+      http.put('/api/admin/users/:id', ({ params }) =>
+        // The update answers with the account fields only.
+        HttpResponse.json({ user: { id: Number(params.id), username: 'alice2', email: 'a2@e.com', role: 'user', created_at: '2026-01-01 00:00:00' } })
+      )
+    );
+    const { result } = await mountAdmin();
+    const before = result.current.users[1];
+    act(() => result.current.handleEditUser(before));
+    act(() => result.current.setEditForm({ username: 'alice2', email: 'a2@e.com', role: 'user', password: '' }));
+    await act(async () => {
+      await result.current.handleSaveUser();
+    });
+
+    const after = result.current.users[1];
+    expect(after).toMatchObject({ username: 'alice2', email: 'a2@e.com' });
+    expect(after.last_login).toBe(before.last_login);
+    expect(after.online).toBe(before.online);
+    expect(after.avatar_url).toBe(before.avatar_url);
+    expect(after.created_at).toBe(before.created_at);
+  });
+
   it('FE-ADMHOOK-037: handleSaveUser refuses a password shorter than eight characters', async () => {
     let called = false;
     server.use(
diff --git a/client/src/pages/admin/useAdmin.ts b/client/src/pages/admin/useAdmin.ts
index 4f543cc0b..a6a94ce8c 100644
--- a/client/src/pages/admin/useAdmin.ts
+++ b/client/src/pages/admin/useAdmin.ts
@@ -1,4 +1,4 @@
-import { useCallback, useEffect, useState } from 'react'
+import { useCallback, useEffect, useRef, useState } from 'react'
 import { useNavigate, useSearchParams } from 'react-router'
 import apiClient, { adminApi, authApi } from '../../api/client'
 import { useAuthStore } from '../../store/authStore'
@@ -8,7 +8,7 @@ import { useTranslation } from '../../i18n'
 import { getApiErrorMessage } from '../../types'
 import { useToast } from '../../components/shared/Toast'
 import { managedAdminTabs } from '../../managed'
-import type { AdminUser, AdminStats, OidcConfig, UpdateInfo } from './adminModel'
+import { mergeSavedUser, type AdminUser, type AdminStats, type OidcConfig, type UpdateInfo } from './adminModel'
 import type { TransitProvider, TransitKeySource } from '@trek/shared'
 import { passwordErrorKey } from '../../utils/passwordError'
 
@@ -35,6 +35,9 @@ const ADMIN_TAB_IDS = [
  */
 const MANAGED_HIDDEN = ['storage', 'github', 'backup']
 
+/** How often the open users list asks again who is online and active. */
+const USERS_REFRESH_MS = 30_000
+
 /**
  * Admin page logic — owns every admin data slice (users, stats, invites, auth
  * toggles, OIDC, feature flags, API keys, SMTP, version/update) plus the CRUD
@@ -246,6 +249,34 @@ export function useAdmin() {
     }
   }
 
+  // Who is online and when someone was last active change while the list is
+  // open; it was read once and went stale until a reload. Refreshed quietly
+  // while the users tab is in view, and at once when the page comes back.
+  // Bumped by every local change to the list; a refresh asked before one is out of date.
+  const usersWrites = useRef(0)
+  useEffect(() => {
+    if (activeTab !== 'users') return
+    let cancelled = false
+    const refresh = async () => {
+      if (document.visibilityState !== 'visible') return
+      const asked = usersWrites.current
+      try {
+        const data = await adminApi.users()
+        if (!cancelled && asked === usersWrites.current) setUsers(data.users)
+      } catch {
+        /* the list on screen stays; the next tick asks again */
+      }
+    }
+    const timer = window.setInterval(() => { void refresh() }, USERS_REFRESH_MS)
+    const onVisible = () => { void refresh() }
+    document.addEventListener('visibilitychange', onVisible)
+    return () => {
+      cancelled = true
+      window.clearInterval(timer)
+      document.removeEventListener('visibilitychange', onVisible)
+    }
+  }, [activeTab])
+
   const loadAppConfig = async () => {
     try {
       const config = await authApi.getAppConfig()
@@ -420,6 +451,7 @@ export function useAdmin() {
     }
     try {
       const data = await adminApi.createUser(createForm)
+      usersWrites.current += 1
       setUsers(prev => [data.user, ...prev])
       setShowCreateUser(false)
       setCreateForm({ username: '', email: '', password: '', role: 'user' })
@@ -484,7 +516,8 @@ export function useAdmin() {
         payload.password = editForm.password.trim()
       }
       const data = await adminApi.updateUser(editingUser.id, payload)
-      setUsers(prev => prev.map(u => u.id === editingUser.id ? data.user : u))
+      usersWrites.current += 1
+      setUsers(prev => prev.map(u => u.id === editingUser.id ? mergeSavedUser(u, data.user) : u))
       setEditingUser(null)
       toast.success(t('admin.toast.userUpdated'))
     } catch (err: unknown) {
@@ -502,6 +535,7 @@ export function useAdmin() {
     if (!opts.confirmed && !confirm(t('admin.deleteUser', { name: user.username }))) return
     try {
       await adminApi.deleteUser(user.id)
+      usersWrites.current += 1
       setUsers(prev => prev.filter(u => u.id !== user.id))
       toast.success(t('admin.toast.userDeleted'))
     } catch (err: unknown) {
diff --git a/server/src/db/repositories/UserSessions.repository.ts b/server/src/db/repositories/UserSessions.repository.ts
index 24b4fd1d6..22aa0516d 100644
--- a/server/src/db/repositories/UserSessions.repository.ts
+++ b/server/src/db/repositories/UserSessions.repository.ts
@@ -1,5 +1,6 @@
 import type { UserSessions } from '../entities/UserSessions.entity';
 import { Users } from '../entities/Users.entity';
+import type { DB } from '../kysely/db';
 import type { AssertRowKeys } from './_shared/rows';
 import { TrekRepository } from './_shared/trek-repository';
 
@@ -154,6 +155,20 @@ export class UserSessionsRepository extends TrekRepository<UserSessions> {
     );
   }
 
+  /**
+   * `SELECT user_id, MAX(last_seen_at) FROM user_sessions GROUP BY user_id`: when
+   * each account last made an authenticated request, over every row the nightly
+   * purge has kept, revoked ones included (the activity still happened).
+   */
+  async lastSeenByUser(): Promise<Map<number, string>> {
+    const rows = await this.kysely<Pick<DB, 'user_sessions'>>()
+      .selectFrom('user_sessions')
+      .select((eb) => ['user_id', eb.fn.max('last_seen_at').as('last_seen_at')])
+      .groupBy('user_id')
+      .execute();
+    return new Map(rows.map((row) => [Number(row.user_id), String(row.last_seen_at)]));
+  }
+
   /**
    * Every active session with its owner's email, read before the database
    * file is swapped (a demo reset, a backup restore):
diff --git a/server/src/nest/admin/admin.service.ts b/server/src/nest/admin/admin.service.ts
index 254baf50a..9302b7dd7 100644
--- a/server/src/nest/admin/admin.service.ts
+++ b/server/src/nest/admin/admin.service.ts
@@ -108,6 +108,13 @@ const VERSION_FAILURE_TTL = 60_000;
  * and module-scoped pieces (compareVersions, isDocker, the version cache) live
  * in admin.helpers.ts.
  */
+/** The later of two stored timestamps; both are canonical UTC text, which sorts as it reads. */
+function latest(a: string | null | undefined, b: string | null | undefined): string | null {
+  if (!a) return b ?? null;
+  if (!b) return a;
+  return a > b ? a : b;
+}
+
 /** The 409 the up-front checks give, for a write that lost the race to another one. */
 function identityTakenMessage(err: UserIdentityTakenError): string {
   return err.field === 'email' ? 'Email already taken' : 'Username already taken';
@@ -148,6 +155,7 @@ export class AdminService {
     // Guests (#1362) are accountless trip participants, not real users — keep them out
     // of admin user management entirely.
     const users = await this.users.listForAdmin();
+    const lastSeen = await this.sessions.lastSeenByUser();
     let onlineUserIds = new Set<number>();
     try {
       // The catch stays here rather than in the facade: an admin list that shows
@@ -163,6 +171,10 @@ export class AdminService {
       created_at: utcSuffix(u.created_at),
       updated_at: utcSuffix(u.updated_at as string),
       last_login: utcSuffix(u.last_login),
+      // The later of the last sign-in and the last request. The cookie renews
+      // itself while someone keeps using TREK, so they may not have signed in
+      // for weeks and still have been here an hour ago.
+      last_active: utcSuffix(latest(u.last_login, lastSeen.get(u.id))),
       online: onlineUserIds.has(u.id),
     }));
   }
diff --git a/server/src/nest/sessions/sessions.service.ts b/server/src/nest/sessions/sessions.service.ts
index 503598ccb..1b32cf1dd 100644
--- a/server/src/nest/sessions/sessions.service.ts
+++ b/server/src/nest/sessions/sessions.service.ts
@@ -164,6 +164,15 @@ export class SessionsService {
     await this.sessions.touchLastSeen(id, now);
   }
 
+  /**
+   * When each account was last active: the newest `last_seen_at` of its
+   * sessions. A sign-in is rare once the cookie renews itself on every visit,
+   * so this is what tells an admin who is still using the instance.
+   */
+  async lastSeenByUser(): Promise<Map<number, string>> {
+    return this.sessions.lastSeenByUser();
+  }
+
   /** The user's active sessions, most recently used first, the one in `currentId` flagged. */
   async list(userId: number, currentId?: string): Promise<UserSession[]> {
     const rows = await this.sessions.listActiveForUser(userId, dbNow());
diff --git a/server/tests/unit/db/repositories/UserSessions.repository.test.ts b/server/tests/unit/db/repositories/UserSessions.repository.test.ts
index b3dba7016..8f841721d 100644
--- a/server/tests/unit/db/repositories/UserSessions.repository.test.ts
+++ b/server/tests/unit/db/repositories/UserSessions.repository.test.ts
@@ -274,4 +274,18 @@ describe('UserSessionsRepository', () => {
       user_agent: 'First',
     });
   });
+  it('SESSREPO-014: lastSeenByUser gives each account its newest last_seen_at, revoked rows included', async () => {
+    const { user } = createUser(testDb);
+    const { user: other } = createUser(testDb);
+    const { user: idle } = createUser(testDb);
+    await add('a', user.id);
+    await add('b', user.id);
+    await add('c', other.id);
+    await sessions.touchLastSeen('a', NOW);
+    await revoke(['c'], NOW);
+    const seen = await sessions.lastSeenByUser();
+    expect(seen.get(user.id)).toBe(NOW);
+    expect(seen.get(other.id)).toBe(EARLIER);
+    expect(seen.has(idle.id)).toBe(false);
+  });
 });
diff --git a/server/tests/unit/nest/admin.service.test.ts b/server/tests/unit/nest/admin.service.test.ts
index f65cf4bff..58e669b4e 100644
--- a/server/tests/unit/nest/admin.service.test.ts
+++ b/server/tests/unit/nest/admin.service.test.ts
@@ -275,6 +275,34 @@ describe('listUsers', () => {
     expect(users.length).toBeGreaterThanOrEqual(2);
     expect(users.every((u: any) => u.online === false)).toBe(true);
   });
+
+  it('ADMIN-SVC-001b — last_active is the later of the last sign-in and the last request', async () => {
+    const { user: busy } = createUser(testDb);
+    const { user: quiet } = createUser(testDb);
+    const { user: never } = createUser(testDb);
+    await updateRows(orm, Users, { id: busy.id }, { last_login: '2026-10-01 08:00:00' });
+    await updateRows(orm, Users, { id: quiet.id }, { last_login: '2026-10-05 08:00:00' });
+    // The cookie renewed itself for a week: no new sign-in, but requests until the 8th.
+    await insertRow(orm, UserSessions, {
+      id: 'busy-session',
+      user: busy.id,
+      created_at: '2026-10-01 08:00:00',
+      last_seen_at: '2026-10-08 17:30:00',
+      expires_at: '2999-01-01 00:00:00',
+    });
+    await insertRow(orm, UserSessions, {
+      id: 'quiet-session',
+      user: quiet.id,
+      created_at: '2026-10-02 08:00:00',
+      last_seen_at: '2026-10-02 09:00:00',
+      expires_at: '2999-01-01 00:00:00',
+    });
+    const users = await listUsers();
+    const of = (id: number) => users.find((u) => u.id === id);
+    expect(of(busy.id)).toMatchObject({ last_login: '2026-10-01T08:00:00Z', last_active: '2026-10-08T17:30:00Z' });
+    expect(of(quiet.id)).toMatchObject({ last_login: '2026-10-05T08:00:00Z', last_active: '2026-10-05T08:00:00Z' });
+    expect(of(never.id)).toMatchObject({ last_login: null, last_active: null });
+  });
 });
 
 // ── createUser ────────────────────────────────────────────────────────────────
diff --git a/shared/src/i18n/ar/admin.ts b/shared/src/i18n/ar/admin.ts
index 95ca432ef..e14806ba8 100644
--- a/shared/src/i18n/ar/admin.ts
+++ b/shared/src/i18n/ar/admin.ts
@@ -92,7 +92,7 @@ const admin: TranslationStrings = {
   'admin.table.email': 'البريد الإلكتروني',
   'admin.table.role': 'الدور',
   'admin.table.created': 'تم الإنشاء',
-  'admin.table.lastLogin': 'آخر تسجيل دخول',
+  'admin.table.lastActive': 'آخر نشاط',
   'admin.table.actions': 'الإجراءات',
   'admin.you': '(أنت)',
   'admin.editUser': 'تعديل المستخدم',
diff --git a/shared/src/i18n/az/admin.ts b/shared/src/i18n/az/admin.ts
index 5562b2c9a..d64885c1e 100644
--- a/shared/src/i18n/az/admin.ts
+++ b/shared/src/i18n/az/admin.ts
@@ -91,7 +91,7 @@ const admin: TranslationStrings = {
   'admin.table.email': 'E-poçt',
   'admin.table.role': 'Rol',
   'admin.table.created': 'Yaradılıb',
-  'admin.table.lastLogin': 'Son giriş',
+  'admin.table.lastActive': 'Son aktivlik',
   'admin.table.actions': 'Əməliyyatlar',
   'admin.you': '(Siz)',
   'admin.editUser': 'İstifadəçini redaktə et',
diff --git a/shared/src/i18n/br/admin.ts b/shared/src/i18n/br/admin.ts
index efdcf9aed..57691dea7 100644
--- a/shared/src/i18n/br/admin.ts
+++ b/shared/src/i18n/br/admin.ts
@@ -35,7 +35,7 @@ const admin: TranslationStrings = {
   'admin.table.email': 'E-mail',
   'admin.table.role': 'Função',
   'admin.table.created': 'Criado',
-  'admin.table.lastLogin': 'Último acesso',
+  'admin.table.lastActive': 'Última atividade',
   'admin.table.actions': 'Ações',
   'admin.you': '(Você)',
   'admin.editUser': 'Editar usuário',
diff --git a/shared/src/i18n/ca/admin.ts b/shared/src/i18n/ca/admin.ts
index 6a366761d..52c321bd6 100644
--- a/shared/src/i18n/ca/admin.ts
+++ b/shared/src/i18n/ca/admin.ts
@@ -36,7 +36,7 @@ const admin: TranslationStrings = {
   'admin.table.email': 'Correu',
   'admin.table.role': 'Rol',
   'admin.table.created': 'Creat',
-  'admin.table.lastLogin': 'Últim accés',
+  'admin.table.lastActive': 'Última activitat',
   'admin.table.actions': 'Accions',
   'admin.you': '(Tu)',
   'admin.editUser': 'Editar usuari',
diff --git a/shared/src/i18n/cs/admin.ts b/shared/src/i18n/cs/admin.ts
index e1f2a817a..0813deaeb 100644
--- a/shared/src/i18n/cs/admin.ts
+++ b/shared/src/i18n/cs/admin.ts
@@ -39,7 +39,7 @@ const admin: TranslationStrings = {
   'admin.table.email': 'E-mail',
   'admin.table.role': 'Role',
   'admin.table.created': 'Vytvořeno',
-  'admin.table.lastLogin': 'Poslední přihlášení',
+  'admin.table.lastActive': 'Naposledy aktivní',
   'admin.table.actions': 'Akce',
   'admin.you': '(Vy)',
   'admin.editUser': 'Upravit uživatele',
diff --git a/shared/src/i18n/de/admin.ts b/shared/src/i18n/de/admin.ts
index bdbd3f666..2a2795360 100644
--- a/shared/src/i18n/de/admin.ts
+++ b/shared/src/i18n/de/admin.ts
@@ -36,7 +36,7 @@ const admin: TranslationStrings = {
   'admin.table.email': 'E-Mail',
   'admin.table.role': 'Rolle',
   'admin.table.created': 'Erstellt',
-  'admin.table.lastLogin': 'Letzter Login',
+  'admin.table.lastActive': 'Zuletzt aktiv',
   'admin.table.actions': 'Aktionen',
   'admin.you': '(Du)',
   'admin.editUser': 'Benutzer bearbeiten',
diff --git a/shared/src/i18n/en/admin.ts b/shared/src/i18n/en/admin.ts
index d5f73c693..099a0ea99 100644
--- a/shared/src/i18n/en/admin.ts
+++ b/shared/src/i18n/en/admin.ts
@@ -87,7 +87,7 @@ const admin: TranslationStrings = {
   'admin.table.email': 'Email',
   'admin.table.role': 'Role',
   'admin.table.created': 'Created',
-  'admin.table.lastLogin': 'Last Login',
+  'admin.table.lastActive': 'Last Active',
   'admin.table.actions': 'Actions',
   'admin.you': '(You)',
   'admin.editUser': 'Edit User',
diff --git a/shared/src/i18n/es/admin.ts b/shared/src/i18n/es/admin.ts
index 7e6e94f99..b5816107b 100644
--- a/shared/src/i18n/es/admin.ts
+++ b/shared/src/i18n/es/admin.ts
@@ -36,7 +36,7 @@ const admin: TranslationStrings = {
   'admin.table.email': 'Correo',
   'admin.table.role': 'Rol',
   'admin.table.created': 'Creado',
-  'admin.table.lastLogin': 'Último acceso',
+  'admin.table.lastActive': 'Última actividad',
   'admin.table.actions': 'Acciones',
   'admin.you': '(Tú)',
   'admin.editUser': 'Editar usuario',
diff --git a/shared/src/i18n/et/admin.ts b/shared/src/i18n/et/admin.ts
index e392dc0a5..ad1f406d8 100644
--- a/shared/src/i18n/et/admin.ts
+++ b/shared/src/i18n/et/admin.ts
@@ -89,7 +89,7 @@ const admin: TranslationStrings = {
   'admin.table.email': 'E-post',
   'admin.table.role': 'Roll',
   'admin.table.created': 'Loodud',
-  'admin.table.lastLogin': 'Viimane sisselogimine',
+  'admin.table.lastActive': 'Viimati aktiivne',
   'admin.table.actions': 'Toimingud',
   'admin.you': '(Sina)',
   'admin.editUser': 'Muuda kasutajat',
diff --git a/shared/src/i18n/fr/admin.ts b/shared/src/i18n/fr/admin.ts
index 8e24c44c5..b2a121cd1 100644
--- a/shared/src/i18n/fr/admin.ts
+++ b/shared/src/i18n/fr/admin.ts
@@ -35,7 +35,7 @@ const admin: TranslationStrings = {
   'admin.table.email': 'E-mail',
   'admin.table.role': 'Rôle',
   'admin.table.created': 'Créé le',
-  'admin.table.lastLogin': 'Dernière connexion',
+  'admin.table.lastActive': 'Dernière activité',
   'admin.table.actions': 'Actions',
   'admin.you': '(Vous)',
   'admin.editUser': "Modifier l'utilisateur",
diff --git a/shared/src/i18n/gr/admin.ts b/shared/src/i18n/gr/admin.ts
index e043d6f3b..a6a78736c 100644
--- a/shared/src/i18n/gr/admin.ts
+++ b/shared/src/i18n/gr/admin.ts
@@ -91,7 +91,7 @@ const admin: TranslationStrings = {
   'admin.table.email': 'Email',
   'admin.table.role': 'Ρόλος',
   'admin.table.created': 'Δημιουργήθηκε',
-  'admin.table.lastLogin': 'Τελευταία Σύνδεση',
+  'admin.table.lastActive': 'Τελευταία Δραστηριότητα',
   'admin.table.actions': 'Ενέργειες',
   'admin.you': '(Εσείς)',
   'admin.editUser': 'Επεξεργασία Χρήστη',
diff --git a/shared/src/i18n/hu/admin.ts b/shared/src/i18n/hu/admin.ts
index b0145622c..f9bf34df3 100644
--- a/shared/src/i18n/hu/admin.ts
+++ b/shared/src/i18n/hu/admin.ts
@@ -35,7 +35,7 @@ const admin: TranslationStrings = {
   'admin.table.email': 'E-mail',
   'admin.table.role': 'Szerepkör',
   'admin.table.created': 'Létrehozva',
-  'admin.table.lastLogin': 'Utolsó belépés',
+  'admin.table.lastActive': 'Utoljára aktív',
   'admin.table.actions': 'Műveletek',
   'admin.you': '(Te)',
   'admin.editUser': 'Felhasználó szerkesztése',
diff --git a/shared/src/i18n/id/admin.ts b/shared/src/i18n/id/admin.ts
index a4dd8dc14..f72bd1fd5 100644
--- a/shared/src/i18n/id/admin.ts
+++ b/shared/src/i18n/id/admin.ts
@@ -83,7 +83,7 @@ const admin: TranslationStrings = {
   'admin.table.email': 'Email',
   'admin.table.role': 'Peran',
   'admin.table.created': 'Dibuat',
-  'admin.table.lastLogin': 'Login Terakhir',
+  'admin.table.lastActive': 'Terakhir Aktif',
   'admin.table.actions': 'Tindakan',
   'admin.you': '(Kamu)',
   'admin.editUser': 'Edit Pengguna',
diff --git a/shared/src/i18n/it/admin.ts b/shared/src/i18n/it/admin.ts
index 119499063..e8b16dc53 100644
--- a/shared/src/i18n/it/admin.ts
+++ b/shared/src/i18n/it/admin.ts
@@ -35,7 +35,7 @@ const admin: TranslationStrings = {
   'admin.table.email': 'Email',
   'admin.table.role': 'Ruolo',
   'admin.table.created': 'Creato',
-  'admin.table.lastLogin': 'Ultimo Accesso',
+  'admin.table.lastActive': 'Ultima Attività',
   'admin.table.actions': 'Azioni',
   'admin.you': '(Tu)',
   'admin.editUser': 'Modifica Utente',
diff --git a/shared/src/i18n/ja/admin.ts b/shared/src/i18n/ja/admin.ts
index e6ef2aaa5..4a4677c78 100644
--- a/shared/src/i18n/ja/admin.ts
+++ b/shared/src/i18n/ja/admin.ts
@@ -77,7 +77,7 @@ const admin: TranslationStrings = {
   'admin.table.email': 'メール',
   'admin.table.role': '権限',
   'admin.table.created': '作成日',
-  'admin.table.lastLogin': '最終ログイン',
+  'admin.table.lastActive': '最終アクティブ',
   'admin.table.actions': '操作',
   'admin.you': '（あなた）',
   'admin.editUser': 'ユーザーを編集',
diff --git a/shared/src/i18n/ko/admin.ts b/shared/src/i18n/ko/admin.ts
index aa64f2bc9..0d152a6e0 100644
--- a/shared/src/i18n/ko/admin.ts
+++ b/shared/src/i18n/ko/admin.ts
@@ -82,7 +82,7 @@ const admin: TranslationStrings = {
   'admin.table.email': '이메일',
   'admin.table.role': '역할',
   'admin.table.created': '생성일',
-  'admin.table.lastLogin': '마지막 로그인',
+  'admin.table.lastActive': '마지막 활동',
   'admin.table.actions': '작업',
   'admin.you': '(나)',
   'admin.editUser': '사용자 편집',
diff --git a/shared/src/i18n/nl/admin.ts b/shared/src/i18n/nl/admin.ts
index ae5e882a1..6496fb137 100644
--- a/shared/src/i18n/nl/admin.ts
+++ b/shared/src/i18n/nl/admin.ts
@@ -36,7 +36,7 @@ const admin: TranslationStrings = {
   'admin.table.email': 'E-mail',
   'admin.table.role': 'Rol',
   'admin.table.created': 'Aangemaakt',
-  'admin.table.lastLogin': 'Laatste login',
+  'admin.table.lastActive': 'Laatst actief',
   'admin.table.actions': 'Acties',
   'admin.you': '(Jij)',
   'admin.editUser': 'Gebruiker bewerken',
diff --git a/shared/src/i18n/pl/admin.ts b/shared/src/i18n/pl/admin.ts
index e66fb39fe..dad6f4f01 100644
--- a/shared/src/i18n/pl/admin.ts
+++ b/shared/src/i18n/pl/admin.ts
@@ -34,7 +34,7 @@ const admin: TranslationStrings = {
   'admin.table.email': 'E-mail',
   'admin.table.role': 'Rola',
   'admin.table.created': 'Utworzono',
-  'admin.table.lastLogin': 'Ostatnie logowanie',
+  'admin.table.lastActive': 'Ostatnia aktywność',
   'admin.table.actions': 'Akcje',
   'admin.you': '(Ty)',
   'admin.editUser': 'Edytuj użytkownika',
diff --git a/shared/src/i18n/ru/admin.ts b/shared/src/i18n/ru/admin.ts
index b64bfadbd..68cded24f 100644
--- a/shared/src/i18n/ru/admin.ts
+++ b/shared/src/i18n/ru/admin.ts
@@ -44,7 +44,7 @@ const admin: TranslationStrings = {
   'admin.table.email': 'Эл. почта',
   'admin.table.role': 'Роль',
   'admin.table.created': 'Создан',
-  'admin.table.lastLogin': 'Последний вход',
+  'admin.table.lastActive': 'Последняя активность',
   'admin.table.actions': 'Действия',
   'admin.you': '(Вы)',
   'admin.editUser': 'Редактировать пользователя',
diff --git a/shared/src/i18n/sk/admin.ts b/shared/src/i18n/sk/admin.ts
index 78c8bb79a..c005acf42 100644
--- a/shared/src/i18n/sk/admin.ts
+++ b/shared/src/i18n/sk/admin.ts
@@ -91,7 +91,7 @@ const admin: TranslationStrings = {
   'admin.table.email': 'E-mail',
   'admin.table.role': 'Rola',
   'admin.table.created': 'Vytvorené',
-  'admin.table.lastLogin': 'Posledné prihlásenie',
+  'admin.table.lastActive': 'Naposledy aktívny',
   'admin.table.actions': 'Akcie',
   'admin.you': '(Vy)',
   'admin.editUser': 'Upraviť používateľa',
diff --git a/shared/src/i18n/sv/admin.ts b/shared/src/i18n/sv/admin.ts
index dea92b916..6263ba486 100644
--- a/shared/src/i18n/sv/admin.ts
+++ b/shared/src/i18n/sv/admin.ts
@@ -88,7 +88,7 @@ const admin: TranslationStrings = {
   'admin.table.email': 'E-post',
   'admin.table.role': 'Roll',
   'admin.table.created': 'Skapad',
-  'admin.table.lastLogin': 'Senast inloggad',
+  'admin.table.lastActive': 'Senast aktiv',
   'admin.table.actions': 'Åtgärder',
   'admin.you': '(Du)',
   'admin.editUser': 'Redigera anvädnare',
diff --git a/shared/src/i18n/th/admin.ts b/shared/src/i18n/th/admin.ts
index 7a5312e55..d63da8b25 100644
--- a/shared/src/i18n/th/admin.ts
+++ b/shared/src/i18n/th/admin.ts
@@ -83,7 +83,7 @@ const admin: TranslationStrings = {
   'admin.table.email': 'อีเมล',
   'admin.table.role': 'บทบาท',
   'admin.table.created': 'สร้างแล้ว',
-  'admin.table.lastLogin': 'เข้าสู่ระบบครั้งล่าสุด',
+  'admin.table.lastActive': 'ใช้งานล่าสุด',
   'admin.table.actions': 'การดำเนินการ',
   'admin.you': '(คุณ)',
   'admin.editUser': 'แก้ไขผู้ใช้',
diff --git a/shared/src/i18n/tr/admin.ts b/shared/src/i18n/tr/admin.ts
index 7fa6b2b91..4ac6e3a61 100644
--- a/shared/src/i18n/tr/admin.ts
+++ b/shared/src/i18n/tr/admin.ts
@@ -88,7 +88,7 @@ const admin: TranslationStrings = {
   'admin.table.email': 'E-posta',
   'admin.table.role': 'Rol',
   'admin.table.created': 'Oluşturulma',
-  'admin.table.lastLogin': 'Son Giriş',
+  'admin.table.lastActive': 'Son Etkinlik',
   'admin.table.actions': 'İşlemler',
   'admin.you': '(Siz)',
   'admin.editUser': 'Kullanıcıyı Düzenle',
diff --git a/shared/src/i18n/uk/admin.ts b/shared/src/i18n/uk/admin.ts
index fb33ec561..eacb0fa27 100644
--- a/shared/src/i18n/uk/admin.ts
+++ b/shared/src/i18n/uk/admin.ts
@@ -44,7 +44,7 @@ const admin: TranslationStrings = {
   'admin.table.email': 'Ел. пошта',
   'admin.table.role': 'Роль',
   'admin.table.created': 'Створено',
-  'admin.table.lastLogin': 'Останній вхід',
+  'admin.table.lastActive': 'Остання активність',
   'admin.table.actions': 'Дії',
   'admin.you': '(Ви)',
   'admin.editUser': 'Редагувати користувача',
diff --git a/shared/src/i18n/vi/admin.ts b/shared/src/i18n/vi/admin.ts
index aace92cdc..564a21641 100644
--- a/shared/src/i18n/vi/admin.ts
+++ b/shared/src/i18n/vi/admin.ts
@@ -84,7 +84,7 @@ const admin: TranslationStrings = {
   'admin.table.email': 'Email',
   'admin.table.role': 'Vai trò',
   'admin.table.created': 'Tạo',
-  'admin.table.lastLogin': 'Đăng nhập lần cuối',
+  'admin.table.lastActive': 'Hoạt động lần cuối',
   'admin.table.actions': 'hành động',
   'admin.you': '(Bạn)',
   'admin.editUser': 'Chỉnh sửa người dùng',
diff --git a/shared/src/i18n/zh-TW/admin.ts b/shared/src/i18n/zh-TW/admin.ts
index f2f701c3a..113d1dbc1 100644
--- a/shared/src/i18n/zh-TW/admin.ts
+++ b/shared/src/i18n/zh-TW/admin.ts
@@ -80,7 +80,7 @@ const admin: TranslationStrings = {
   'admin.table.email': '郵箱',
   'admin.table.role': '角色',
   'admin.table.created': '建立時間',
-  'admin.table.lastLogin': '最後登入',
+  'admin.table.lastActive': '最後活動',
   'admin.table.actions': '操作',
   'admin.you': '（你）',
   'admin.editUser': '編輯使用者',
diff --git a/shared/src/i18n/zh/admin.ts b/shared/src/i18n/zh/admin.ts
index 43e792916..51f717f1b 100644
--- a/shared/src/i18n/zh/admin.ts
+++ b/shared/src/i18n/zh/admin.ts
@@ -32,7 +32,7 @@ const admin: TranslationStrings = {
   'admin.table.email': '邮箱',
   'admin.table.role': '角色',
   'admin.table.created': '创建时间',
-  'admin.table.lastLogin': '最后登录',
+  'admin.table.lastActive': '最后活动',
   'admin.table.actions': '操作',
   'admin.you': '（你）',
   'admin.editUser': '编辑用户',
diff --git a/wiki/Admin-Users-and-Invites.md b/wiki/Admin-Users-and-Invites.md
index ed400272c..dcd5584d0 100644
--- a/wiki/Admin-Users-and-Invites.md
+++ b/wiki/Admin-Users-and-Invites.md
@@ -10,13 +10,15 @@ The **Users** card shows the number of accounts in its head and a table of every
 
 | Column | Description |
 |--------|-------------|
-| **User** | Avatar, username, and an always-visible presence dot (green = online, grey = offline) |
+| **User** | Avatar, username, and an always-visible presence dot (green = has TREK open, grey = offline) |
 | **Email** | Account email address |
 | **Role** | Badge showing **Administrator** or **User** |
 | **Created** | Account creation date |
-| **Last Login** | Date and time of most recent login |
+| **Last Active** | When the account last signed in or used TREK, whichever is later. A session renews itself while it is used, so someone can be active daily without signing in for weeks. The year shows once it is not the current one. |
 | **Actions** | Edit and delete buttons |
 
+The dots and the last activity refresh every 30 seconds while the list is open, and right away when you come back to the tab.
+
 Your own row is highlighted and marked **(You)**. Its delete button is disabled: you cannot delete your own account.
 
 ## User actions