diff --git a/backend/src/db.js b/backend/src/db.js
index 24083a6..ee398a5 100644
--- a/backend/src/db.js
+++ b/backend/src/db.js
@@ -252,6 +252,8 @@ if (!userCols2.includes('preferences'))
   db.exec("ALTER TABLE users ADD COLUMN preferences TEXT DEFAULT NULL");
 if (!userCols2.includes('last_active_at'))
   db.exec("ALTER TABLE users ADD COLUMN last_active_at DATETIME DEFAULT NULL");
+if (!userCols2.includes('hidden'))
+  db.exec("ALTER TABLE users ADD COLUMN hidden INTEGER NOT NULL DEFAULT 0");
 
 // ── Login-Sicherheit ──────────────────────────────────────────────────────────
 // Spalten für Account-Lockout in users-Tabelle
diff --git a/backend/src/routes/admin.js b/backend/src/routes/admin.js
index aa88ff3..33b05af 100644
--- a/backend/src/routes/admin.js
+++ b/backend/src/routes/admin.js
@@ -32,7 +32,7 @@ router.post('/restore', authenticate, requireAdmin, upload.single('database'), (
 // GET /api/admin/users – alle Benutzer mit Statistiken
 router.get('/users', authenticate, requireAdmin, (req, res) => {
   const users = db.prepare(`
-    SELECT u.id, u.username, u.role, u.created_at, u.last_active_at,
+    SELECT u.id, u.username, u.role, u.created_at, u.last_active_at, u.hidden,
       CASE WHEN p.user_id IS NOT NULL THEN 1 ELSE 0 END as has_pushover
     FROM users u
     LEFT JOIN pushover_settings p ON p.user_id = u.id
@@ -160,4 +160,13 @@ router.get('/login-log', authenticate, requireAdmin, (req, res) => {
   `).all());
 });
 
+// Toggle hidden
+router.put('/users/:id/hidden', authenticate, requireAdmin, (req, res) => {
+  const user = db.prepare('SELECT * FROM users WHERE id=?').get(req.params.id);
+  if (!user) return res.status(404).json({ error: 'Nicht gefunden' });
+  const newHidden = user.hidden ? 0 : 1;
+  db.prepare('UPDATE users SET hidden=? WHERE id=?').run(newHidden, user.id);
+  res.json({ hidden: newHidden });
+});
+
 module.exports = router;
diff --git a/frontend/src/App.jsx b/frontend/src/App.jsx
index 7c2700e..b66ec87 100644
--- a/frontend/src/App.jsx
+++ b/frontend/src/App.jsx
@@ -1259,7 +1259,7 @@ function ChangelogModal({ user, toast, onClose }) {
                   </div>
                   <div style={{display:'flex',alignItems:'center',gap:6,flexShrink:0}}>
                     <span style={{color:'rgba(255,255,255,0.2)',fontFamily:'monospace',fontSize:9}}>
-                      {fmtDate(e.created_at)}
+                      {typeof __BUILD_TIME__ !== 'undefined' && __BUILD_TIME__ ? __BUILD_TIME__ : fmtDate(e.created_at)}
                     </span>
                     {isAdmin && (
                       <button onClick={()=>del(e.id)}
@@ -1681,6 +1681,15 @@ function UserManagement({ toast }) {
                     borderRadius:4, padding:'1px 6px',
                   }}>🔔 Push</span>
                 )}
+                {!!u.hidden && (
+                  <span title="Für andere Benutzer unsichtbar" style={{
+                    marginLeft:4, fontSize:9, fontFamily:'monospace',
+                    color:'rgba(255,230,109,0.7)',
+                    background:'rgba(255,230,109,0.08)',
+                    border:'1px solid rgba(255,230,109,0.2)',
+                    borderRadius:4, padding:'1px 6px',
+                  }}>👁 versteckt</span>
+                )}
                 {u.last_active_at && (
                   <span style={{
                     marginLeft:6, fontSize:9, fontFamily:'monospace',
@@ -1701,6 +1710,20 @@ function UserManagement({ toast }) {
               <div style={{display:'flex',gap:5}}>
                 <button onClick={()=>{setResetId(u.id);setResetPw('');}}
                   style={{...S.btn('#ffe66d',true),fontSize:10}}>🔑 PW</button>
+                <button
+                  onClick={async ()=>{
+                    try {
+                      const r = await api(`/admin/users/${u.id}/hidden`,{method:'PUT'});
+                      setUsers(p=>p.map(x=>x.id===u.id?{...x,hidden:r.hidden}:x));
+                      toast(r.hidden ? 'Benutzer ausgeblendet' : 'Benutzer wieder sichtbar');
+                    } catch(e){ toast(e.message,'error'); }
+                  }}
+                  title={u.hidden ? 'Für andere Benutzer unsichtbar – klicken zum Einblenden' : 'Für andere Benutzer sichtbar – klicken zum Ausblenden'}
+                  style={{...S.btn(u.hidden?'#ffe66d':'rgba(255,255,255,0.3)',true),fontSize:10,
+                    opacity: u.role==='admin'?0.4:1,
+                    cursor: u.role==='admin'?'not-allowed':'pointer'}}>
+                  {u.hidden ? '👁 einblenden' : '👁 ausblenden'}
+                </button>
                 <button onClick={()=>del(u.id)} style={{...S.btn('#ff6b9d',true)}}>
                   <TrashIcon size={13} color="#ff6b9d"/>
                 </button>