diff --git a/html/admin.html b/html/admin.html
index 470e610..cb84d95 100644
--- a/html/admin.html
+++ b/html/admin.html
@@ -34,12 +34,12 @@
   /* Every container admin.js paints a table into is a scrollport of its own, so a
      sticky header always has something to stick to rather than sliding up behind
      the app bar. Same rule as console.css's .tscroll. */
-  #comments-admin, #audit-admin, #notif-box, #usage-admin, #projects-table, #defmem-table{
+  #comments-admin, #audit-admin, #notif-box, #usage-admin, #activity-admin, #projects-table, #defmem-table{
     overflow:auto; max-height:min(70vh,640px); overscroll-behavior:contain; }
   /* If admin.js wraps its table in its own .tscroll, the outer box steps aside so
      one table never ends up with two scrollbars. */
   #comments-admin:has(.tscroll), #audit-admin:has(.tscroll), #notif-box:has(.tscroll),
-  #usage-admin:has(.tscroll), #projects-table:has(.tscroll), #defmem-table:has(.tscroll){
+  #usage-admin:has(.tscroll), #activity-admin:has(.tscroll), #projects-table:has(.tscroll), #defmem-table:has(.tscroll){
     overflow:visible; max-height:none; }
 
   /* Comment text and audit detail are the two columns you are actually here to
@@ -53,7 +53,7 @@
     border:1px solid var(--border-strong); border-radius:0; margin-bottom:var(--s3); }
 
   @media (max-width:900px){
-    #comments-admin, #audit-admin, #notif-box, #usage-admin, #projects-table, #defmem-table{
+    #comments-admin, #audit-admin, #notif-box, #usage-admin, #activity-admin, #projects-table, #defmem-table{
       max-height:none; }
   }
 </style>
@@ -175,7 +175,41 @@
     <div id="audit-admin" class="note">Click refresh to load.</div>
   </div>
 
-  <!-- USAGE LOGS -->
+  <!-- ACTIVITY &amp; USAGE (CR-019) -->
+  <div class="card">
+    <h2>Activity &amp; usage</h2>
+    <div class="sub">Who is using the suite, which tools, and how often — recorded server-side on every
+      sign-in and page open, kept indefinitely. Filter below, or export a CSV: raw (real usernames) for
+      internal use, or sanitized (each user replaced with a stable, non-reversible id) for feeding into
+      Power BI or another external reporting tool without carrying real identities.</div>
+    <div class="toolbar">
+      <label for="act-from">From</label>
+      <input type="date" id="act-from" onchange="loadActivity()">
+      <label for="act-to">To</label>
+      <input type="date" id="act-to" onchange="loadActivity()">
+      <select id="act-project" onchange="loadActivity()"><option value="">All projects</option></select>
+      <input id="act-user" placeholder="Username…" oninput="loadActivity()">
+      <select id="act-tool" onchange="loadActivity()">
+        <option value="">All tools</option>
+        <option value="launcher">Launcher</option>
+        <option value="wizard">SOP wizard</option>
+        <option value="creator">Work package creator</option>
+        <option value="field_view">Field view</option>
+        <option value="admin">Admin console</option>
+        <option value="directory">User directory</option>
+      </select>
+      <button onclick="loadActivity()">Refresh</button>
+    </div>
+    <div id="activity-banner" class="banner" style="display:none"></div>
+    <div id="activity-admin" class="note">Loading…</div>
+    <div class="toolbar" style="margin-top:var(--s3)">
+      <button onclick="exportActivity(false)">Download CSV (raw)</button>
+      <button onclick="exportActivity(true)">Download CSV (sanitized)</button>
+    </div>
+    <div id="activity-export-banner" class="banner" style="display:none"></div>
+  </div>
+
+  <!-- USAGE LOGS (per-browser — retired once the report above is confirmed, T11.6) -->
   <div class="card">
     <h2>Usage logs</h2>
     <div class="sub">Engagement recorded by both tools — the work package creator and the SOP wizard —
diff --git a/html/admin.js b/html/admin.js
index f339bd1..e1a5934 100644
--- a/html/admin.js
+++ b/html/admin.js
@@ -24,6 +24,7 @@ function reveal(){
   loadNotifications();
   loadComments();
   loadAudit();
+  loadActivity();
   loadUsage();
 }
 function showDenied(){
@@ -189,6 +190,19 @@ async function loadProjects(){
   banner.style.display='none';
   _adminProjects = json;
   renderProjects();
+  populateActivityProjectFilter();
+}
+
+// The activity project filter reuses the same project list the Projects card
+// already fetched — no second /api/projects call just to fill a <select>.
+function populateActivityProjectFilter(){
+  const sel = document.getElementById('act-project');
+  if(!sel) return;
+  const cur = sel.value;
+  sel.innerHTML = '<option value="">All projects</option>' +
+    _adminProjects.slice().sort((a,b)=>String(a.name||'').localeCompare(String(b.name||'')))
+      .map(p => '<option value="'+uesc(p.id)+'">'+uesc(p.name||p.number||p.id)+'</option>').join('');
+  sel.value = cur;
 }
 
 function renderProjects(){
@@ -465,6 +479,90 @@ function renderAudit(){
     '</tr>').join('')+'</tbody></table>';
 }
 
+// ── activity & usage (CR-019) ────────────────────────────────────────────────────
+// Server-side, per-user activity — distinct from the "Activity log" card above
+// (that's AuditLog: business mutations) and from the "Usage logs" card below
+// (that's per-browser localStorage, D5/T7.10, on the way out per T11.6). This is
+// /api/usage/summary and /api/usage/export: real rows, aggregated server-side,
+// filterable by date/project/user/tool, and exportable raw or sanitized.
+function _activityFilters(){
+  const q = new URLSearchParams();
+  const from = document.getElementById('act-from').value; if(from) q.set('from', from);
+  const to = document.getElementById('act-to').value; if(to) q.set('to', to);
+  const proj = document.getElementById('act-project').value; if(proj) q.set('project_id', proj);
+  const user = (document.getElementById('act-user').value||'').trim(); if(user) q.set('username', user);
+  const tool = document.getElementById('act-tool').value; if(tool) q.set('tool', tool);
+  return q;
+}
+async function loadActivity(){
+  const banner = document.getElementById('activity-banner');
+  const box = document.getElementById('activity-admin');
+  if(!box) return;
+  banner.style.display='none';
+  box.textContent = 'Loading…';
+  const { status, json } = await api('GET', '/api/usage/summary?'+_activityFilters().toString());
+  if(status===403){
+    banner.className='banner bad'; banner.style.display='';
+    banner.textContent = '✕ Your account can’t see suite-wide activity here — this needs admin, or Project Super User on at least one project.';
+    box.innerHTML=''; return;
+  }
+  if(status!==200 || !json){
+    banner.className='banner bad'; banner.style.display='';
+    banner.textContent = '✕ Could not load activity ('+apiError(status, json, 'load failed')+').';
+    box.innerHTML=''; return;
+  }
+  renderActivity(json);
+}
+function renderActivity(sum){
+  const box = document.getElementById('activity-admin');
+  if(!sum.event_count){ box.innerHTML = '<div class="note">No activity matches this filter.</div>'; return; }
+  const fmt = s => s ? wpFormatDateTime(s) : '—';
+  const bucket = (label, obj, take) => {
+    const entries = Object.entries(obj).sort((a,b)=> b[0].localeCompare(a[0])).slice(0, take);
+    if(!entries.length) return '';
+    return '<table class="kv" style="margin-top:8px"><caption style="text-align:left;font-weight:600;margin-bottom:4px">'+
+      uesc(label)+'</caption>'+entries.map(([k,v]) => '<tr><th>'+uesc(k)+'</th><td>'+v+' active user'+(v===1?'':'s')+'</td></tr>').join('')+
+      '</table>';
+  };
+  const perTool = Object.entries(sum.by_tool||{});
+  const toolTable = perTool.length ? '<table class="users"><thead><tr><th>Tool</th><th>Events</th></tr></thead><tbody>'+
+    perTool.map(([t,n]) => '<tr><td>'+uesc(t||'(login)')+'</td><td>'+n+'</td></tr>').join('')+'</tbody></table>' :
+    '<div class="note">No per-tool data.</div>';
+  const perUser = Object.entries(sum.per_user_last_active||{}).sort((a,b)=> String(b[1]).localeCompare(String(a[1])));
+  const userTable = perUser.length ? '<table class="users"><thead><tr><th>User</th><th>Last active</th></tr></thead><tbody>'+
+    perUser.map(([u,t]) => '<tr><td><strong>'+uesc(u)+'</strong></td><td style="color:var(--muted)">'+fmt(t)+'</td></tr>').join('')+
+    '</tbody></table>' : '<div class="note">No per-user data.</div>';
+  box.innerHTML =
+    '<div class="note">'+sum.event_count+' event'+(sum.event_count===1?'':'s')+' matched.</div>'+
+    '<div class="row" style="gap:var(--s4);flex-wrap:wrap;align-items:flex-start">'+
+      '<div>'+bucket('Active users by day', sum.active_users.by_day, 30)+'</div>'+
+      '<div>'+bucket('Active users by week', sum.active_users.by_week, 12)+'</div>'+
+      '<div>'+bucket('Active users by month', sum.active_users.by_month, 12)+'</div>'+
+    '</div>'+
+    '<h2 style="margin-top:16px">By tool</h2>'+toolTable+
+    '<h2 style="margin-top:16px">Per-user last active</h2>'+userTable;
+}
+async function exportActivity(sanitize){
+  const banner = document.getElementById('activity-export-banner');
+  banner.className='banner'; banner.style.display=''; banner.textContent='Preparing export…';
+  const q = _activityFilters();
+  if(sanitize) q.set('sanitize', 'true');
+  const { status, json } = await api('GET', '/api/usage/export?'+q.toString());
+  if(status!==200 || typeof json !== 'string'){
+    banner.className='banner bad';
+    banner.textContent = '✕ Export failed ('+apiError(status, json, 'export failed')+').';
+    return;
+  }
+  const blob = new Blob([json], { type:'text/csv' });
+  const a = document.createElement('a');
+  a.href = URL.createObjectURL(blob);
+  a.download = 'usage_export_'+(sanitize?'sanitized':'raw')+'_'+new Date().toISOString().slice(0,10)+'.csv';
+  document.body.appendChild(a); a.click(); a.remove();
+  setTimeout(() => URL.revokeObjectURL(a.href), 1000);
+  banner.className='banner ok';
+  banner.textContent = '✓ Downloaded the '+(sanitize?'sanitized':'raw')+' export.';
+}
+
 // ── notifications / email settings ──────────────────────────────────────────────
 let _settings = {};
 async function loadSettings(){