diff --git a/manager/components/AdminNotifications.tsx b/manager/components/AdminNotifications.tsx
index 9d2f3c4..d24286f 100644
--- a/manager/components/AdminNotifications.tsx
+++ b/manager/components/AdminNotifications.tsx
@@ -63,8 +63,9 @@ const AdminNotifications: React.FC<Props> = ({ data, updateData, setView, onNavi
     if (!notif.read) handleMarkAsRead(notif.id);
     
     if (notif.title.toLowerCase().includes('justificativa') || notif.message.toLowerCase().includes('justificativa')) {
-      if (onNavigateToStudent) {
-        onNavigateToStudent(notif.studentId);
+      const targetId = (notif as any).fromStudentId || notif.studentId;
+      if (onNavigateToStudent && targetId !== 'admin') {
+        onNavigateToStudent(targetId);
       } else {
         setView(View.AttendanceQuery);
       }
@@ -94,8 +95,11 @@ const AdminNotifications: React.FC<Props> = ({ data, updateData, setView, onNavi
     );
     
     if (pendingAbsences.length > 0) {
-      // Tenta achar pelo studentId mencionado na mensagem ou aceita o mais recente
-      const matchedAbsence = pendingAbsences[0]; // aceita o mais recente pendente
+      // Tenta achar pelo studentId mencionado ou associado à notificação
+      const targetId = (notif as any).fromStudentId;
+      const matchedAbsence = targetId 
+        ? pendingAbsences.find(a => a.studentId === targetId) || pendingAbsences[0]
+        : pendingAbsences[0];
       
       const updatedAttendance = (data.attendance || []).map(a => 
         a.id === matchedAbsence.id ? { ...a, justificationAccepted: true } : a
@@ -168,7 +172,7 @@ const AdminNotifications: React.FC<Props> = ({ data, updateData, setView, onNavi
                     try {
                       const parsed = JSON.parse(notif.message);
                       displayMessage = parsed.motivo || displayMessage;
-                      attachmentFromMessage = parsed.arquivo_base64 || null;
+                      attachmentFromMessage = parsed.arquivo || parsed.arquivo_base64 || null;
                     } catch(e) {}
                   }
 
@@ -189,13 +193,14 @@ const AdminNotifications: React.FC<Props> = ({ data, updateData, setView, onNavi
                         {displayMessage}
                       </p>
                       {(!notif.read) && (
-                        <div className="flex justify-end mt-2 gap-2 opacity-0 group-hover:opacity-100 transition-opacity">
+                        <div className="flex justify-end mt-2 gap-2 transition-opacity">
                           {isJustificativa && (
                             <button 
                               onClick={(e) => { 
                                 e.stopPropagation(); 
-                                if (onNavigateToStudent) {
-                                  onNavigateToStudent(notif.studentId);
+                                const targetId = (notif as any).fromStudentId || notif.studentId;
+                                if (onNavigateToStudent && targetId !== 'admin') {
+                                  onNavigateToStudent(targetId);
                                 } else {
                                   setView(View.AttendanceQuery);
                                 }
diff --git a/manager/components/AttendanceQuery.tsx b/manager/components/AttendanceQuery.tsx
index 111887a..a2e9d51 100644
--- a/manager/components/AttendanceQuery.tsx
+++ b/manager/components/AttendanceQuery.tsx
@@ -111,6 +111,7 @@ const AttendanceQuery: React.FC<AttendanceQueryProps> = ({ data, updateData, dee
     try {
       const parsed = JSON.parse(attendanceForAttachment.justification);
       delete parsed.arquivo_base64;
+      delete parsed.arquivo;
       const updatedJustification = JSON.stringify(parsed);
       
       const updatedAttendance = (data.attendance || []).map(a => 
@@ -593,7 +594,7 @@ const AttendanceQuery: React.FC<AttendanceQueryProps> = ({ data, updateData, dee
                               try {
                                 const parsed = JSON.parse(justMotivo);
                                 justMotivo = parsed.motivo || justMotivo;
-                                justAttachment = parsed.arquivo_base64 || null;
+                                justAttachment = parsed.arquivo || parsed.arquivo_base64 || null;
                               } catch(e) {}
                             }
 
diff --git a/manager/components/Sidebar.tsx b/manager/components/Sidebar.tsx
index d28db8b..a0b5dea 100644
--- a/manager/components/Sidebar.tsx
+++ b/manager/components/Sidebar.tsx
@@ -32,9 +32,10 @@ interface SidebarProps {
   setView: (view: View) => void;
   user: User | null;
   logo?: string;
+  onLogout: () => void;
 }
 
-const Sidebar: React.FC<SidebarProps> = ({ currentView, setView, user, logo }) => {
+const Sidebar: React.FC<SidebarProps> = ({ currentView, setView, user, logo, onLogout }) => {
   const [isCollapsed, setIsCollapsed] = useState(false);
   const [isMobileOpen, setIsMobileOpen] = useState(false);
 
@@ -147,7 +148,7 @@ const Sidebar: React.FC<SidebarProps> = ({ currentView, setView, user, logo }) =
             )}
             {!isCollapsed && (
               <button 
-                onClick={() => window.location.reload()}
+                onClick={onLogout}
                 className="p-1.5 text-slate-400 hover:text-red-500 rounded-lg transition-all"
                 title="Sair"
               >
diff --git a/manager/index.tsx b/manager/index.tsx
index 4587e30..4355b11 100644
--- a/manager/index.tsx
+++ b/manager/index.tsx
@@ -28,6 +28,7 @@ import { DialogProvider } from './DialogContext';
 const App = () => {
   const [isAuthenticated, setIsAuthenticated] = useState(false);
   const [currentUser, setCurrentUser] = useState<User | null>(null);
+  const [isCheckingAuth, setIsCheckingAuth] = useState(true);
   const [currentView, setCurrentView] = useState<View>(View.Dashboard);
   const [deepLinkStudentId, setDeepLinkStudentId] = useState<string | null>(null);
   const [deepLinkClassId, setDeepLinkClassId] = useState<string | null>(null);
@@ -41,11 +42,23 @@ const App = () => {
 
   // 0. Load from IndexedDB on mount
   useEffect(() => {
-    const loadLocal = async () => {
-      const localData = await dbService.initData();
-      setData(prev => ({ ...prev, ...localData }));
+    const loadSessionAndData = async () => {
+      try {
+        const savedSession = localStorage.getItem('edumanager_session');
+        if (savedSession) {
+          const user = JSON.parse(savedSession);
+          setCurrentUser(user);
+          setIsAuthenticated(true);
+        }
+        const localData = await dbService.initData();
+        setData(prev => ({ ...prev, ...localData }));
+      } catch (e) {
+        console.error("Erro ao carregar sessão:", e);
+      } finally {
+        setIsCheckingAuth(false);
+      }
     };
-    loadLocal();
+    loadSessionAndData();
   }, []);
 
   // 1. Initial Cloud Fetch (Sync on Load)
@@ -122,37 +135,28 @@ const App = () => {
     dataRef.current = data;
   }, [data]);
 
+  // 4. Polling Inteligente (Substitui o Realtime do Supabase no ambiente Self-Hosted)
+  // Verifica mudanças no servidor a cada 30 segundos
   useEffect(() => {
-    if (isCloudEnabled) {
-      console.log("📡 Iniciando escuta em tempo real para school_data...");
-      // Cria um canal de escuta para a tabela school_data
-      const channel = supabase
-        .channel('school_data_changes')
-        .on(
-          'postgres_changes',
-          { event: 'UPDATE', schema: 'public', table: 'school_data', filter: 'id=eq.1' },
-          (payload) => {
-            // Quando houver um UPDATE (ex: Portal enviou justificativa)
-            const newData = payload.new.data as SchoolData;
-            
-            // Só atualiza se for uma mudança externa (evita loops)
-            if (newData.lastUpdated !== dataRef.current.lastUpdated) {
-              console.log("🔔 Nova mudança externa detectada em tempo real!");
-              setData(newData);
-              dbService.saveData(newData); // Sincroniza cache local
-            }
-          }
-        )
-        .subscribe((status) => {
-          console.log("🔌 Status da conexão Realtime:", status);
-        });
+    const pollInterval = setInterval(async () => {
+      // Pequena validação para não interromper ações do usuário
+      if (syncStatus === 'syncing') return;
+      
+      try {
+        const cloudData = await dbService.fetchFromCloud();
+        if (cloudData && cloudData.lastUpdated !== dataRef.current.lastUpdated) {
+          console.log("🔔 Polling: Novos dados detectados no servidor!");
+          setData(cloudData);
+          dbService.saveData(cloudData);
+          setSyncStatus('saved');
+        }
+      } catch (e) {
+        // Silencioso em caso de erro de rede temporário
+      }
+    }, 30000); // 30 segundos
 
-      return () => {
-        console.log("⚰️ Encerrando canal de Realtime");
-        supabase.removeChannel(channel);
-      };
-    }
-  }, [isCloudEnabled]);
+    return () => clearInterval(pollInterval);
+  }, [syncStatus]);
 
   const updateData = (newData: Partial<SchoolData>) => {
     setData(prev => ({ 
@@ -228,16 +232,32 @@ const App = () => {
     }
   };
 
+  if (isCheckingAuth) {
+    return (
+      <div className="min-h-screen bg-slate-50 flex items-center justify-center">
+        <RefreshCw size={48} className="text-indigo-600 animate-spin" />
+      </div>
+    );
+  }
+
   if (!isAuthenticated) {
     return <Auth data={data} onLogin={(user) => {
+      localStorage.setItem('edumanager_session', JSON.stringify(user));
       setCurrentUser(user);
       setIsAuthenticated(true);
     }} onUpdateUsers={handleUpdateUsers} />;
   }
 
+  const handleLogout = () => {
+    localStorage.removeItem('edumanager_session');
+    setIsAuthenticated(false);
+    setCurrentUser(null);
+    setCurrentView(View.Dashboard);
+  };
+
   return (
     <div className="flex min-h-screen bg-slate-50 relative">
-      <Sidebar currentView={currentView} setView={setCurrentView} user={currentUser} logo={data.logo} />
+      <Sidebar currentView={currentView} setView={setCurrentView} user={currentUser} logo={data.logo} onLogout={handleLogout} />
       <main className="flex-1 w-full overflow-y-auto max-h-screen pt-16 md:pt-0 relative">
         {/* Sync Indicator - Green Strip on the Right */}
         {syncStatus === 'syncing' && (
diff --git a/portal/server.selfhosted.js b/portal/server.selfhosted.js
index dcd3679..84e31ef 100644
--- a/portal/server.selfhosted.js
+++ b/portal/server.selfhosted.js
@@ -308,10 +308,14 @@ app.post('/api/portal/frequencia/justificar', authMiddleware, upload.single('arq
     }
 
     notifications.push({
-      id: `notif-${Date.now()}`, studentId: 'admin',
+      id: `notif-${Date.now()}`, 
+      studentId: 'admin',
+      fromStudentId: req.user.studentId, // Identificador para navegação no Manager
       title: 'Nova Justificativa de Falta',
       message: `${student?.name || 'Aluno'} enviou uma justificativa para a aula de ${date}.`,
-      attachment: publicUrl, read: false, createdAt: new Date().toISOString(),
+      attachment: publicUrl, 
+      read: false, 
+      createdAt: new Date().toISOString(),
     });
 
     schoolData.attendance = attendance;