Update

.env_dev

@@ -1,5 +1,5 @@
 PP_PASSWORD='$ouzs4D$@RAi9'
-DATABASE_URL=postgresql://tickettracker:${PP_PASSWORD}@172.22.0.3:5432/tickettracker_dev
+DATABASE_URL=postgresql://tickettracker:${PP_PASSWORD}@172.22.0.4:5432/tickettracker_dev
 APP_PORT=3911
 TICKETTRACKER_IMAGE=git.d-razz.de/michael/tickettracker:latest
 COOKIE_SECURE=false

backend/src/auth.ts

@@ -24,6 +24,11 @@ export type AuthUser = {
   zammad_time_unit_rounding_minutes: number;
   zammad_atoss_email_sync_enabled: boolean;
   zammad_article_type_id: number;
+  project_followup_enabled: boolean;
+  project_followup_weeks: number;
+  project_followup_second_enabled: boolean;
+  project_followup_second_weeks: number;
+  project_followup_complete_on_session: boolean;
 };
 
 declare global {
@@ -91,7 +96,12 @@ function publicUser(user: AuthUser) {
     zammad_time_unit_rounding_enabled: Boolean(user.zammad_time_unit_rounding_enabled),
     zammad_time_unit_rounding_minutes: Number(user.zammad_time_unit_rounding_minutes ?? 15),
     zammad_atoss_email_sync_enabled: Boolean(user.zammad_atoss_email_sync_enabled ?? true),
-    zammad_article_type_id: Number(user.zammad_article_type_id ?? 6)
+    zammad_article_type_id: Number(user.zammad_article_type_id ?? 6),
+    project_followup_enabled: Boolean(user.project_followup_enabled ?? true),
+    project_followup_weeks: Number(user.project_followup_weeks ?? 4),
+    project_followup_second_enabled: Boolean(user.project_followup_second_enabled ?? true),
+    project_followup_second_weeks: Number(user.project_followup_second_weeks ?? 2),
+    project_followup_complete_on_session: Boolean(user.project_followup_complete_on_session ?? true)
   };
 }
 
@@ -155,7 +165,12 @@ export async function requireAuth(req: Request, res: Response, next: NextFunctio
           u.zammad_time_unit_rounding_enabled,
           u.zammad_time_unit_rounding_minutes,
           u.zammad_atoss_email_sync_enabled,
-          COALESCE(u.zammad_article_type_id, 6) AS zammad_article_type_id
+          COALESCE(u.zammad_article_type_id, 6) AS zammad_article_type_id,
+          u.project_followup_enabled,
+          u.project_followup_weeks,
+          u.project_followup_second_enabled,
+          u.project_followup_second_weeks,
+          u.project_followup_complete_on_session
         FROM auth_sessions s
         JOIN users u ON u.id = s.user_id
         WHERE s.token_hash = $1

backend/src/migrations.ts

@@ -93,6 +93,11 @@ export async function migrate() {
   await query("ALTER TABLE users ADD COLUMN IF NOT EXISTS zammad_time_unit_rounding_minutes INTEGER NOT NULL DEFAULT 15;");
   await query("ALTER TABLE users ADD COLUMN IF NOT EXISTS zammad_atoss_email_sync_enabled BOOLEAN NOT NULL DEFAULT true;");
   await query("ALTER TABLE users ADD COLUMN IF NOT EXISTS zammad_article_type_id INTEGER DEFAULT 6;");
+  await query("ALTER TABLE users ADD COLUMN IF NOT EXISTS project_followup_enabled BOOLEAN NOT NULL DEFAULT true;");
+  await query("ALTER TABLE users ADD COLUMN IF NOT EXISTS project_followup_weeks INTEGER NOT NULL DEFAULT 4;");
+  await query("ALTER TABLE users ADD COLUMN IF NOT EXISTS project_followup_second_enabled BOOLEAN NOT NULL DEFAULT true;");
+  await query("ALTER TABLE users ADD COLUMN IF NOT EXISTS project_followup_second_weeks INTEGER NOT NULL DEFAULT 2;");
+  await query("ALTER TABLE users ADD COLUMN IF NOT EXISTS project_followup_complete_on_session BOOLEAN NOT NULL DEFAULT true;");
   await query("UPDATE users SET zammad_article_type_id = 6 WHERE zammad_article_type_id IS NULL;");
   await query("ALTER TABLE users ALTER COLUMN zammad_article_type_id SET DEFAULT 6;");
   await query("ALTER TABLE users ALTER COLUMN zammad_article_type_id SET NOT NULL;");
@@ -106,6 +111,16 @@ export async function migrate() {
       DROP CONSTRAINT IF EXISTS users_zammad_article_type_id_valid,
       ADD CONSTRAINT users_zammad_article_type_id_valid CHECK (zammad_article_type_id IN (1, 2, 3, 4, 5, 6));
   `);
+  await query(`
+    ALTER TABLE users
+      DROP CONSTRAINT IF EXISTS users_project_followup_weeks_valid,
+      ADD CONSTRAINT users_project_followup_weeks_valid CHECK (project_followup_weeks BETWEEN 1 AND 52);
+  `);
+  await query(`
+    ALTER TABLE users
+      DROP CONSTRAINT IF EXISTS users_project_followup_second_weeks_valid,
+      ADD CONSTRAINT users_project_followup_second_weeks_valid CHECK (project_followup_second_weeks BETWEEN 1 AND 52);
+  `);
 
   await query(`
     CREATE TABLE IF NOT EXISTS auth_sessions (
@@ -191,6 +206,9 @@ export async function migrate() {
   await query("ALTER TABLE tickets ADD COLUMN IF NOT EXISTS zammad_state_id BIGINT;");
   await query("UPDATE tickets SET zammad_state_id = 2 WHERE zammad_state_id = 1;");
   await query("ALTER TABLE tickets ADD COLUMN IF NOT EXISTS zammad_owner_id BIGINT;");
+  await query("ALTER TABLE tickets ADD COLUMN IF NOT EXISTS user_id BIGINT REFERENCES users(id) ON DELETE SET NULL;");
+  await query("ALTER TABLE tickets ADD COLUMN IF NOT EXISTS zammad_merged_from_ticket_id BIGINT;");
+  await query("ALTER TABLE tickets ADD COLUMN IF NOT EXISTS zammad_merged_from_ticket_number TEXT;");
   await query("ALTER TABLE tickets ADD COLUMN IF NOT EXISTS zammad_preferences JSONB NOT NULL DEFAULT '{}'::jsonb;");
   await query(`
     ALTER TABLE tickets
@@ -208,6 +226,55 @@ export async function migrate() {
       END IF;
     END $$;
   `);
+  await query(`
+    WITH unique_zammad_users AS (
+      SELECT zammad_user_id, MIN(id) AS user_id
+      FROM users
+      WHERE role = 'user'
+        AND active
+        AND zammad_user_id IS NOT NULL
+      GROUP BY zammad_user_id
+      HAVING COUNT(*) = 1
+    ),
+    zammad_ticket_owners AS (
+      SELECT t.id, uzu.user_id
+      FROM tickets t
+      LEFT JOIN unique_zammad_users uzu ON uzu.zammad_user_id = t.zammad_owner_id
+      WHERE t.zammad_owner_id IS NOT NULL
+    )
+    UPDATE tickets t
+    SET user_id = zto.user_id
+    FROM zammad_ticket_owners zto
+    WHERE t.id = zto.id
+      AND t.user_id IS DISTINCT FROM zto.user_id;
+  `);
+  await query(`
+    UPDATE tickets t
+    SET user_id = owner.user_id
+    FROM (
+      SELECT ticket_id, MIN(user_id) AS user_id
+      FROM projects
+      GROUP BY ticket_id
+    ) owner
+    WHERE t.user_id IS NULL
+      AND t.zammad_owner_id IS NULL
+      AND t.id = owner.ticket_id;
+  `);
+  await query(`
+    UPDATE tickets t
+    SET user_id = owner.user_id
+    FROM (
+      SELECT ticket_id, MIN(user_id) AS user_id
+      FROM sessions
+      WHERE user_id IS NOT NULL
+      GROUP BY ticket_id
+    ) owner
+    WHERE t.user_id IS NULL
+      AND t.zammad_owner_id IS NULL
+      AND t.id = owner.ticket_id;
+  `);
+  await query("CREATE INDEX IF NOT EXISTS idx_tickets_user ON tickets(user_id);");
+  await query("CREATE INDEX IF NOT EXISTS idx_tickets_zammad_owner ON tickets(zammad_owner_id);");
 
   await query(`
     CREATE TABLE IF NOT EXISTS sessions (
@@ -691,6 +758,43 @@ export async function migrate() {
   await query("ALTER TABLE projects ADD COLUMN IF NOT EXISTS closed_at TIMESTAMPTZ;");
   await query("ALTER TABLE projects ADD COLUMN IF NOT EXISTS close_review_required BOOLEAN NOT NULL DEFAULT false;");
   await query("ALTER TABLE projects ADD COLUMN IF NOT EXISTS manual_consumption_minutes INTEGER NOT NULL DEFAULT 0;");
+  await query("ALTER TABLE projects ADD COLUMN IF NOT EXISTS zammad_owner_id BIGINT;");
+  await query("ALTER TABLE projects ALTER COLUMN user_id DROP NOT NULL;");
+  await query(`
+    UPDATE projects p
+    SET zammad_owner_id = t.zammad_owner_id
+    FROM tickets t
+    WHERE p.ticket_id = t.id
+      AND p.zammad_owner_id IS NULL
+      AND t.zammad_owner_id IS NOT NULL;
+  `);
+  await query(`
+    UPDATE projects p
+    SET user_id = t.user_id,
+        zammad_owner_id = t.zammad_owner_id
+    FROM tickets t
+    WHERE p.ticket_id = t.id
+      AND t.zammad_owner_id IS NOT NULL
+      AND (
+        p.user_id IS DISTINCT FROM t.user_id
+        OR p.zammad_owner_id IS DISTINCT FROM t.zammad_owner_id
+      )
+      AND NOT EXISTS (
+        SELECT 1
+        FROM projects existing
+        WHERE existing.ticket_id = p.ticket_id
+          AND existing.id <> p.id
+          AND (
+            (t.user_id IS NOT NULL AND existing.user_id = t.user_id)
+            OR (
+              t.user_id IS NULL
+              AND existing.user_id IS NULL
+              AND existing.zammad_owner_id IS NOT DISTINCT FROM t.zammad_owner_id
+            )
+          )
+      );
+  `);
+  await query("CREATE UNIQUE INDEX IF NOT EXISTS idx_projects_zammad_owner_ticket ON projects(zammad_owner_id, ticket_id) WHERE user_id IS NULL AND zammad_owner_id IS NOT NULL;");
   await query(`
     DO $$
     BEGIN
@@ -782,13 +886,26 @@ export async function migrate() {
   `);
 
   await query(`
-    INSERT INTO projects (user_id, ticket_id, teamspace_project, description, goals)
+    INSERT INTO projects (user_id, zammad_owner_id, ticket_id, teamspace_project, description, goals)
-    SELECT DISTINCT s.user_id, s.ticket_id, COALESCE(t.title, ''), '', ''
+    SELECT DISTINCT
+      CASE
+        WHEN t.zammad_owner_id IS NOT NULL THEN zammad_owner_user.id
+        ELSE s.user_id
+      END,
+      t.zammad_owner_id,
+      s.ticket_id,
+      COALESCE(t.title, ''),
+      '',
+      ''
     FROM sessions s
     JOIN tickets t ON t.id = s.ticket_id
+    LEFT JOIN users zammad_owner_user
+      ON zammad_owner_user.role = 'user'
+      AND zammad_owner_user.active
+      AND zammad_owner_user.zammad_user_id = t.zammad_owner_id
     WHERE s.work_type = 'consulting'
       AND s.user_id IS NOT NULL
-    ON CONFLICT (user_id, ticket_id) DO NOTHING;
+    ON CONFLICT DO NOTHING;
   `);
 
   await query(`
@@ -918,6 +1035,53 @@ export async function migrate() {
   await query("CREATE INDEX IF NOT EXISTS idx_ticket_todos_ticket_user ON ticket_todos(ticket_id, user_id);");
   await query("CREATE INDEX IF NOT EXISTS idx_ticket_todos_user_period ON ticket_todos(user_id, starts_on, ends_on);");
   await query("CREATE INDEX IF NOT EXISTS idx_ticket_todos_user_sort_order ON ticket_todos(user_id, sort_order, id);");
+
+  await query(`
+    CREATE TABLE IF NOT EXISTS project_followup_reminders (
+      id BIGSERIAL PRIMARY KEY,
+      user_id BIGINT NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+      project_id BIGINT NOT NULL REFERENCES projects(id) ON DELETE CASCADE,
+      ticket_id BIGINT NOT NULL REFERENCES tickets(id) ON DELETE CASCADE,
+      todo_id BIGINT REFERENCES ticket_todos(id) ON DELETE SET NULL,
+      stage INTEGER NOT NULL DEFAULT 1,
+      latest_tt_update_at TIMESTAMPTZ NOT NULL,
+      due_on DATE NOT NULL,
+      created_at TIMESTAMPTZ NOT NULL DEFAULT now(),
+      updated_at TIMESTAMPTZ NOT NULL DEFAULT now(),
+      CONSTRAINT project_followup_reminders_stage_valid CHECK (stage IN (1, 2))
+    );
+  `);
+  await query("ALTER TABLE project_followup_reminders ADD COLUMN IF NOT EXISTS stage INTEGER NOT NULL DEFAULT 1;");
+  await query(`
+    ALTER TABLE project_followup_reminders
+      DROP CONSTRAINT IF EXISTS project_followup_reminders_stage_valid,
+      ADD CONSTRAINT project_followup_reminders_stage_valid CHECK (stage IN (1, 2));
+  `);
+  await query(`
+    DO $$
+    DECLARE
+      constraint_name text;
+    BEGIN
+      SELECT c.conname
+      INTO constraint_name
+      FROM pg_constraint c
+      WHERE c.conrelid = 'project_followup_reminders'::regclass
+        AND c.contype = 'u'
+        AND c.conkey = ARRAY[
+          (SELECT attnum FROM pg_attribute WHERE attrelid = 'project_followup_reminders'::regclass AND attname = 'user_id'),
+          (SELECT attnum FROM pg_attribute WHERE attrelid = 'project_followup_reminders'::regclass AND attname = 'project_id'),
+          (SELECT attnum FROM pg_attribute WHERE attrelid = 'project_followup_reminders'::regclass AND attname = 'latest_tt_update_at')
+        ]::smallint[];
+
+      IF constraint_name IS NOT NULL THEN
+        EXECUTE format('ALTER TABLE project_followup_reminders DROP CONSTRAINT %I', constraint_name);
+      END IF;
+    END $$;
+  `);
+  await query("CREATE UNIQUE INDEX IF NOT EXISTS idx_project_followup_reminders_unique_stage ON project_followup_reminders(user_id, project_id, latest_tt_update_at, stage);");
+  await query("CREATE INDEX IF NOT EXISTS idx_project_followup_reminders_user_project ON project_followup_reminders(user_id, project_id, latest_tt_update_at DESC);");
+  await query("CREATE INDEX IF NOT EXISTS idx_project_followup_reminders_todo ON project_followup_reminders(todo_id) WHERE todo_id IS NOT NULL;");
+
   await query("CREATE INDEX IF NOT EXISTS idx_recurring_billings_user_active ON recurring_billings(user_id, active);");
   await query("UPDATE recurring_billings SET active = true WHERE active = false;");
   await query(`

frontend/src/App.tsx

@@ -1,5 +1,4 @@
 import {
-  AlertCircle,
   CalendarDays,
   CheckCircle2,
   ClipboardCheck,
@@ -591,20 +590,57 @@ const sidebarTodoCalendarClasses: Record<TicketTodo["priority"], string> = {
 };
 
 const sidebarOverdueTodoClass = "border-red-500/60 bg-red-500/15 text-red-100";
+const sidebarTodoPriorityOrder: Record<TicketTodo["priority"], number> = {
+  urgent: 0,
+  high: 1,
+  medium: 2,
+  low: 3
+};
+
+function sortSidebarCurrentTodos(todos: TicketTodo[], today: string) {
+  return [...todos].sort((left, right) => {
+    const leftOverdue = isTodoOverdue(left, today);
+    const rightOverdue = isTodoOverdue(right, today);
+
+    if (leftOverdue !== rightOverdue) {
+      return leftOverdue ? -1 : 1;
+    }
+
+    return sidebarTodoPriorityOrder[left.priority] - sidebarTodoPriorityOrder[right.priority] || left.sort_order - right.sort_order || left.title.localeCompare(right.title, "de-DE", { sensitivity: "base" });
+  });
+}
 
 function notifyTodosChanged() {
   window.dispatchEvent(new Event("tickettracker:todos-changed"));
 }
 
 function SidebarTodayTodos({ todos, onNavigate }: SidebarTodayTodosProps) {
-  const [runningTodosOpen, setRunningTodosOpen] = useState(false);
+  const [todosModalOpen, setTodosModalOpen] = useState(false);
   const [modalBusy, setModalBusy] = useState(false);
   const today = currentDay();
   const fixedTodos = todos.filter((todo) => isTodoFixedOnDay(todo, today));
   const summarizedTodos = todos.filter((todo) => todo.status === "open" && isTodoActiveOnDay(todo, today) && !isTodoFixedOnDay(todo, today));
   const overdueTodos = todos.filter((todo) => isTodoOverdue(todo, today));
+  const currentTodos = sortSidebarCurrentTodos(
+    [...overdueTodos, ...fixedTodos, ...summarizedTodos].filter((todo, index, list) => list.findIndex((item) => item.id === todo.id) === index),
+    today
+  );
+  const visibleCurrentTodos = currentTodos.slice(0, 6);
+  const additionalTodosCount = Math.max(0, currentTodos.length - visibleCurrentTodos.length);
   const hasTodos = fixedTodos.length > 0 || summarizedTodos.length > 0 || overdueTodos.length > 0;
 
+  function todoStateLabel(todo: TicketTodo) {
+    if (isTodoOverdue(todo, today)) {
+      return "Überfällig";
+    }
+
+    if (isTodoFixedOnDay(todo, today)) {
+      return "Fester Termin";
+    }
+
+    return "Laufend";
+  }
+
   async function toggleTodo(todo: TicketTodo) {
     setModalBusy(true);
 
@@ -666,42 +702,30 @@ function SidebarTodayTodos({ todos, onNavigate }: SidebarTodayTodosProps) {
 
             {hasTodos ? (
               <div className="space-y-1">
-                {overdueTodos.slice(0, 3).map((todo) => (
+                {visibleCurrentTodos.map((todo) => (
                   <button
-                    key={`overdue-${todo.id}`}
+                    key={`current-${todo.id}`}
                     type="button"
-                    className="block w-full rounded-md border border-red-500/45 bg-red-500/10 px-2 py-1.5 text-left hover:bg-red-500/15"
+                    className={`block w-full rounded-md border px-2 py-1.5 text-left hover:brightness-110 ${isTodoOverdue(todo, today) ? sidebarOverdueTodoClass : sidebarTodoCalendarClasses[todo.priority]}`}
-                    onClick={() => onNavigate(`/tickets/${todo.ticket_id}`)}
-                  >
-                    <span className="flex min-w-0 items-center gap-1.5 text-[11px] font-semibold text-red-200">
-                      <AlertCircle className="size-3.5 shrink-0" />
-                      <span className="truncate">{todo.title}</span>
-                    </span>
-                    <span className="block truncate text-[11px] text-muted-foreground">{todo.ticket_number ?? "Ticket"} · {formatTodoPeriod(todo)}</span>
-                  </button>
-                ))}
-                {overdueTodos.length > 3 ? <p className="px-1 text-[11px] text-red-200">+{overdueTodos.length - 3} weitere überfällig</p> : null}
-
-                {fixedTodos.slice(0, 3).map((todo) => (
-                  <button
-                    key={`fixed-${todo.id}`}
-                    type="button"
-                    className={`block w-full rounded-md border px-2 py-1.5 text-left hover:brightness-110 ${sidebarTodoCalendarClasses[todo.priority]}`}
                     onClick={() => onNavigate(`/tickets/${todo.ticket_id}`)}
                   >
                     <span className="block truncate text-[11px] font-semibold">{todo.title}</span>
-                    <span className="block truncate text-[11px] text-muted-foreground">{todo.ticket_number ?? "Ticket"} · {todo.organization_name ?? "Keine Organisation"}</span>
+                    <span className="block truncate text-[11px] text-muted-foreground">
+                      {todo.ticket_number ?? "Ticket"} · {todoStateLabel(todo)}
+                    </span>
                   </button>
                 ))}
-                {fixedTodos.length > 3 ? <p className="px-1 text-[11px] text-muted-foreground">+{fixedTodos.length - 3} weitere feste Termine</p> : null}
 
-                {summarizedTodos.length > 0 ? (
+                {additionalTodosCount > 0 ? (
                   <button
                     type="button"
                     className="block w-full rounded-md border border-muted-foreground/20 bg-background/60 px-2 py-1.5 text-left text-[11px] font-medium text-muted-foreground hover:bg-muted"
-                    onClick={() => setRunningTodosOpen(true)}
+                    onClick={() => setTodosModalOpen(true)}
                   >
-                    +{summarizedTodos.length} laufende ToDo{summarizedTodos.length === 1 ? "" : "s"}
+                    <span className="block">+{additionalTodosCount} weitere aktuelle ToDo{additionalTodosCount === 1 ? "" : "s"}</span>
+                    <span className="block truncate font-normal">
+                      {overdueTodos.length} überfällig · {summarizedTodos.length} laufend · {fixedTodos.length} feste
+                    </span>
                   </button>
                 ) : null}
               </div>
@@ -712,22 +736,24 @@ function SidebarTodayTodos({ todos, onNavigate }: SidebarTodayTodosProps) {
         </SidebarGroupContent>
       </SidebarGroup>
 
-      <Dialog open={runningTodosOpen} onOpenChange={setRunningTodosOpen}>
+      <Dialog open={todosModalOpen} onOpenChange={setTodosModalOpen}>
         <DialogContent className="max-h-[calc(100dvh-2rem)] overflow-y-auto sm:max-w-xl">
           <DialogHeader>
-            <DialogTitle>ToDos am Tag</DialogTitle>
+            <DialogTitle>Aktuelle ToDos</DialogTitle>
-            <DialogDescription>Heute · {summarizedTodos.length} laufende ToDo(s)</DialogDescription>
+            <DialogDescription>
+              {overdueTodos.length} überfällig · {fixedTodos.length} feste Termine · {summarizedTodos.length} laufende ToDo(s)
+            </DialogDescription>
           </DialogHeader>
           <div className="space-y-2">
-            {summarizedTodos.map((todo) => (
+            {currentTodos.map((todo) => (
               <div key={todo.id} className={`rounded-md border p-2.5 ${isTodoOverdue(todo, today) ? sidebarOverdueTodoClass : sidebarTodoCalendarClasses[todo.priority]}`}>
                 <div className="flex flex-col gap-2">
                   <div className="flex items-start justify-between gap-3">
                     <div className="min-w-0">
                       <div className="flex min-w-0 flex-wrap items-center gap-2">
                         <span className="min-w-0 truncate text-sm font-semibold">{todo.title}</span>
+                        <Badge variant={isTodoOverdue(todo, today) ? "destructive" : isTodoFixedOnDay(todo, today) ? "outline" : "secondary"}>{todoStateLabel(todo)}</Badge>
                         <span className={`shrink-0 rounded-full border px-2 py-0.5 text-xs font-medium ${sidebarTodoPriorityClasses[todo.priority]}`}>{sidebarTodoPriorityLabels[todo.priority]}</span>
-                        {isTodoOverdue(todo, today) ? <Badge variant="destructive">überfällig</Badge> : null}
                       </div>
                       <p className="mt-1 truncate text-xs text-muted-foreground" title={todo.organization_name ?? "Keine Organisation"}>
                         {todo.organization_name ?? "Keine Organisation"}
@@ -749,7 +775,7 @@ function SidebarTodayTodos({ todos, onNavigate }: SidebarTodayTodosProps) {
                         size="sm"
                         variant="ghost"
                         onClick={() => {
-                          setRunningTodosOpen(false);
+                          setTodosModalOpen(false);
                           onNavigate(`/tickets/${todo.ticket_id}`);
                         }}
                       >
@@ -764,8 +790,8 @@ function SidebarTodayTodos({ todos, onNavigate }: SidebarTodayTodosProps) {
                 </div>
               </div>
             ))}
-            {summarizedTodos.length === 0 ? (
+            {currentTodos.length === 0 ? (
-              <p className="rounded-md border bg-muted/20 p-4 text-center text-sm text-muted-foreground">Keine laufenden ToDos an diesem Tag.</p>
+              <p className="rounded-md border bg-muted/20 p-4 text-center text-sm text-muted-foreground">Keine aktuellen ToDos.</p>
             ) : null}
           </div>
         </DialogContent>
@@ -1289,7 +1315,7 @@ export function App() {
 
     setOpenTickets((items) => items.filter((item) => item.key !== ticket.key));
 
-    if (pathWithoutSearch(path) === pathWithoutSearch(ticket.path)) {
+    if (route.page === "ticket" && route.ticketId === ticket.ticketId) {
       const returnPath = current.returnPath && pathWithoutSearch(current.returnPath) !== pathWithoutSearch(ticket.path) ? current.returnPath : "/analysis";
       routerNavigate(returnPath);
     }
@@ -1505,7 +1531,7 @@ export function App() {
             <SidebarMenuItem>
               <SidebarMenuButton tooltip="Worklog">
                 <FolderGit />
-                <span className="text-xs text-muted-foreground">v1.0.10-rc1</span>
+                <span className="text-xs text-muted-foreground">v1.0.11-rc1</span>
               </SidebarMenuButton>
             </SidebarMenuItem>
           </SidebarMenu>

frontend/src/api.ts

@@ -10,6 +10,7 @@ import type {
   ProjectSummary,
   RecurringBilling,
   StatisticsOverview,
+  StatisticsProjectFollowupOverview,
   TicketMeta,
   TicketPeriod,
   TicketTodo,
@@ -254,6 +255,11 @@ export function updateCurrentUser(payload: {
   zammadTimeUnitRoundingMinutes?: number;
   zammadAtossEmailSyncEnabled?: boolean;
   zammadArticleTypeId?: number;
+  projectFollowupEnabled?: boolean;
+  projectFollowupWeeks?: number;
+  projectFollowupSecondEnabled?: boolean;
+  projectFollowupSecondWeeks?: number;
+  projectFollowupCompleteOnSession?: boolean;
 }) {
   return request<{ user: AuthUser }>("/api/auth/me", {
     method: "PATCH",
@@ -672,6 +678,13 @@ export function updateProjectStatus(projectId: string, closed: boolean) {
   });
 }
 
+export function acknowledgeProjectReview(projectId: string) {
+  return request<{ project: { id: string; ticket_id: string; close_review_required: boolean } }>(`/api/projects/${projectId}/review`, {
+    method: "PATCH",
+    body: JSON.stringify({ acknowledged: true })
+  });
+}
+
 export function deleteProject(projectId: string) {
   return request<{ deleted: { id: string; ticket_id: string } }>(`/api/projects/${projectId}`, {
     method: "DELETE"
@@ -882,6 +895,10 @@ export function getStatisticsOverview(period: string, type: "month" | "week" = "
   return request<StatisticsOverview>(`/api/statistics/${type === "week" ? "weeks" : "months"}/${period}`);
 }
 
+export function getProjectFollowups() {
+  return request<StatisticsProjectFollowupOverview>("/api/statistics/project-followups");
+}
+
 export function getTicketPeriod(type: PeriodType, period: string, ticketId: string) {
   return request<TicketPeriod>(`/api/periods/${periodPath(type)}/${period}/tickets/${ticketId}`);
 }

frontend/src/types.ts

@@ -19,6 +19,11 @@ export type AuthUser = {
   zammad_time_unit_rounding_minutes: number;
   zammad_atoss_email_sync_enabled: boolean;
   zammad_article_type_id: number;
+  project_followup_enabled: boolean;
+  project_followup_weeks: number;
+  project_followup_second_enabled: boolean;
+  project_followup_second_weeks: number;
+  project_followup_complete_on_session: boolean;
 };
 
 export type DashboardWidgetType = "dayControl" | "today" | "month" | "openRatings" | "projectBudgets" | "todos" | "teamspace" | "favorites" | "divider" | "statistic" | "notes";
@@ -135,6 +140,11 @@ export type TicketMeta = {
   zammad_priority_id?: string | null;
   zammad_state_id?: string | null;
   zammad_owner_id?: string | null;
+  zammad_owner_user_id?: string | null;
+  zammad_owner_display_name?: string | null;
+  zammad_owner_username?: string | null;
+  is_foreign_zammad_owner?: boolean;
+  can_edit_ticket_data?: boolean;
   project_id?: string | null;
   is_project?: boolean;
   project_name?: string | null;
@@ -179,7 +189,12 @@ export type ProjectSummary = {
   work_type: WorkType | null;
   zammad_priority_id?: string | null;
   zammad_state_id?: string | null;
+  zammad_ticket_id?: string | null;
+  zammad_owner_id?: string | null;
+  ticket_zammad_owner_id?: string | null;
   zammad_pending_time?: string | null;
+  zammad_merged_from_ticket_id?: string | null;
+  zammad_merged_from_ticket_number?: string | null;
   teamspace_project: string | null;
   description: string;
   goals: string;
@@ -369,8 +384,16 @@ export type TicketPeriod = {
     organization_name: string | null;
     customer_name: string | null;
     work_type: WorkType | null;
+    zammad_ticket_id?: string | null;
+    zammad_group_id?: string | null;
     zammad_priority_id?: string | null;
     zammad_state_id?: string | null;
+    zammad_owner_id?: string | null;
+    zammad_owner_user_id?: string | null;
+    zammad_owner_display_name?: string | null;
+    zammad_owner_username?: string | null;
+    is_foreign_zammad_owner?: boolean;
+    can_edit_ticket_data?: boolean;
     closed_at: string | null;
     requires_closure: boolean;
     recurring_session_count: number;
@@ -477,6 +500,35 @@ export type StatisticsTeamspaceDay = {
   project_teamspace_project: string | null;
 };
 
+export type StatisticsProjectFollowup = {
+  project_id: string;
+  ticket_id: string;
+  ticket_number: string;
+  title: string | null;
+  organization_name: string | null;
+  teamspace_project: string | null;
+  hour_budget_minutes: number | null;
+  consumption_minutes: number;
+  remaining_minutes: number | null;
+  latest_tt_update: string;
+  last_session_at: string | null;
+  project_updated_at: string;
+  open_followup_todo_id: string | null;
+  followup_state: "open" | "done" | "dismissed" | null;
+  open_todos: number;
+  overdue_todos: number;
+};
+
+export type StatisticsProjectFollowupOverview = {
+  enabled: boolean;
+  weeks: number;
+  secondEnabled: boolean;
+  secondWeeks: number;
+  createdTodos: number;
+  updatedTodos: number;
+  projects: StatisticsProjectFollowup[];
+};
+
 export type StatisticsOverview = {
   periodType: "month" | "week";
   period: string;

frontend/src/views/DashboardPage.tsx

@@ -1861,12 +1861,14 @@ function DayControlWidget({ stats, projects, todos, onNavigate }: WidgetContentP
               const percent = projectConsumptionPercent(project);
 	              const hasUnassignedSessions = Number(project.unassigned_teamspace_session_count ?? 0) > 0;
 	              const detail = project.close_review_required
-                ? "Abschluss prüfen"
+	                ? project.zammad_merged_from_ticket_id || project.zammad_state_id !== "4" ? "Merge prüfen" : "Abschluss prüfen"
 	                : hasUnassignedSessions
 	                  ? `${project.unassigned_teamspace_session_count} Session(s) ohne TS-Zuordnung`
 	                  : `${percent ?? 0}% Kontingent verbraucht`;
 	              const note = project.close_review_required
-                ? "Abschluss in TT/Teamspace prüfen und ggf. Umbuchungen klären."
+	                ? project.zammad_merged_from_ticket_id || project.zammad_state_id !== "4"
+	                  ? "Lokale Projektdaten aus dem alten Ticket prüfen und in Zammad nachtragen."
+	                  : "Abschluss in TT/Teamspace prüfen und ggf. Umbuchungen klären."
                 : hasUnassignedSessions
                   ? "Sessions einem Teamspace-Projekt zuordnen."
                   : "Kontingent kritisch: Budget, Verbrauch und weitere Arbeit prüfen.";

frontend/src/views/ProfilePage.tsx

@@ -31,6 +31,11 @@ export function ProfilePage({ currentUser, onUserUpdated }: ProfilePageProps) {
   const [zammadTimeUnitRoundingEnabled, setZammadTimeUnitRoundingEnabled] = useState(currentUser.zammad_time_unit_rounding_enabled);
   const [zammadTimeUnitRoundingMinutes, setZammadTimeUnitRoundingMinutes] = useState(currentUser.zammad_time_unit_rounding_minutes);
   const [zammadArticleTypeId, setZammadArticleTypeId] = useState<ZammadArticleTypeId>(currentUser.zammad_article_type_id ?? 6);
+  const [projectFollowupEnabled, setProjectFollowupEnabled] = useState(currentUser.project_followup_enabled ?? true);
+  const [projectFollowupWeeks, setProjectFollowupWeeks] = useState(currentUser.project_followup_weeks ?? 4);
+  const [projectFollowupSecondEnabled, setProjectFollowupSecondEnabled] = useState(currentUser.project_followup_second_enabled ?? true);
+  const [projectFollowupSecondWeeks, setProjectFollowupSecondWeeks] = useState(currentUser.project_followup_second_weeks ?? 2);
+  const [projectFollowupCompleteOnSession, setProjectFollowupCompleteOnSession] = useState(currentUser.project_followup_complete_on_session ?? true);
   const [zammadQueue, setZammadQueue] = useState<ZammadSessionArticleQueueItem[]>([]);
   const [loadingZammadQueue, setLoadingZammadQueue] = useState(false);
   const [retryingZammadQueue, setRetryingZammadQueue] = useState(false);
@@ -48,6 +53,11 @@ export function ProfilePage({ currentUser, onUserUpdated }: ProfilePageProps) {
     setZammadTimeUnitRoundingEnabled(currentUser.zammad_time_unit_rounding_enabled);
     setZammadTimeUnitRoundingMinutes(currentUser.zammad_time_unit_rounding_minutes);
     setZammadArticleTypeId(currentUser.zammad_article_type_id ?? 6);
+    setProjectFollowupEnabled(currentUser.project_followup_enabled ?? true);
+    setProjectFollowupWeeks(currentUser.project_followup_weeks ?? 4);
+    setProjectFollowupSecondEnabled(currentUser.project_followup_second_enabled ?? true);
+    setProjectFollowupSecondWeeks(currentUser.project_followup_second_weeks ?? 2);
+    setProjectFollowupCompleteOnSession(currentUser.project_followup_complete_on_session ?? true);
   }, [currentUser]);
 
   async function loadZammadQueue() {
@@ -132,7 +142,12 @@ export function ProfilePage({ currentUser, onUserUpdated }: ProfilePageProps) {
           zammadSessionNoteDefaultEnabled,
           zammadTimeUnitRoundingEnabled,
           zammadTimeUnitRoundingMinutes,
-            zammadArticleTypeId
+          zammadArticleTypeId,
+          projectFollowupEnabled,
+          projectFollowupWeeks,
+          projectFollowupSecondEnabled,
+          projectFollowupSecondWeeks,
+          projectFollowupCompleteOnSession
         }
         : {})
     };
@@ -334,6 +349,89 @@ export function ProfilePage({ currentUser, onUserUpdated }: ProfilePageProps) {
                     onCheckedChange={setSessionBillingPromptEnabled}
                   />
                 </div>
+                <div className="mt-3 space-y-3 rounded-md border bg-background p-3">
+                  <div className="flex items-center justify-between gap-3">
+                    <div>
+                      <label className="text-sm font-medium" htmlFor="profile-project-followup-enabled">
+                        Automatische Wiedervorlagen
+                      </label>
+                      <p className="text-xs text-muted-foreground">Consulting-Projekte automatisch auf Wiedervorlage setzen.</p>
+                    </div>
+                    <Switch
+                      id="profile-project-followup-enabled"
+                      checked={projectFollowupEnabled}
+                      onCheckedChange={setProjectFollowupEnabled}
+                    />
+                  </div>
+
+                  {projectFollowupEnabled ? (
+                    <div className="space-y-3 border-t pt-3">
+                      <div>
+                        <p className="text-sm font-medium">1. Wiedervorlage aktiv</p>
+                        <p className="text-xs text-muted-foreground">Wenn automatische Wiedervorlagen aktiv sind, wird die erste WVL immer geprüft.</p>
+                      </div>
+
+                      <div className="grid gap-2 sm:max-w-xs">
+                        <label className="text-sm font-medium" htmlFor="profile-project-followup-weeks">
+                          1. Wiedervorlage nach Wochen
+                        </label>
+                        <Input
+                          id="profile-project-followup-weeks"
+                          type="number"
+                          min={1}
+                          max={52}
+                          value={projectFollowupWeeks}
+                          onChange={(event) => setProjectFollowupWeeks(Math.max(1, Math.min(52, Number(event.currentTarget.value) || 1)))}
+                        />
+                      </div>
+
+
+
+                      <div className="flex items-center justify-between gap-3">
+                        <div>
+                          <label className="text-sm font-medium" htmlFor="profile-project-followup-second-enabled">
+                            2. Wiedervorlage
+                          </label>
+                          <p className="text-xs text-muted-foreground">Nur anlegen, wenn die erste WVL erledigt oder gelöscht wurde und keine Session entstanden ist.</p>
+                        </div>
+                        <Switch
+                          id="profile-project-followup-second-enabled"
+                          checked={projectFollowupSecondEnabled}
+                          onCheckedChange={setProjectFollowupSecondEnabled}
+                        />
+                      </div>
+
+                      {projectFollowupSecondEnabled ? (
+                        <div className="grid gap-2 sm:max-w-xs">
+                          <label className="text-sm font-medium" htmlFor="profile-project-followup-second-weeks">
+                            2. Wiedervorlage nach weiteren Wochen
+                          </label>
+                          <Input
+                            id="profile-project-followup-second-weeks"
+                            type="number"
+                            min={1}
+                            max={52}
+                            value={projectFollowupSecondWeeks}
+                            onChange={(event) => setProjectFollowupSecondWeeks(Math.max(1, Math.min(52, Number(event.currentTarget.value) || 1)))}
+                          />
+                        </div>
+                      ) : null}
+                    </div>
+                  ) : null}
+                  <div className="flex items-center justify-between gap-3">
+                    <div>
+                      <label className="text-sm font-medium" htmlFor="profile-project-followup-complete-on-session">
+                        Automatische Wiedervorlagen durch Session erledigen
+                      </label>
+                      <p className="text-xs text-muted-foreground">Gilt für beide Zeiträume. Betrifft nur automatisch erzeugte Wiedervorlagen, niemals manuelle ToDos.</p>
+                    </div>
+                    <Switch
+                      id="profile-project-followup-complete-on-session"
+                      checked={projectFollowupCompleteOnSession}
+                      onCheckedChange={setProjectFollowupCompleteOnSession}
+                    />
+                  </div>
+                </div>
                 <div className="mt-3 flex items-center justify-between gap-3 rounded-md border bg-background p-3">
                   <div className="flex items-center gap-2">
                     <FileText className="size-4 text-muted-foreground" />

frontend/src/views/ProjectsPage.tsx

@@ -15,7 +15,7 @@ import { HelpLink } from "@/components/HelpLink";
 import { MultiFilterDropdown, type MultiFilterOption } from "@/components/MultiFilterDropdown";
 import { OrganizationSelect } from "@/components/OrganizationSelect";
 import { cn } from "@/lib/utils";
-import { addFavoriteTicket, createProject, getProjects, hideProject, lookupTicket, unhideProject, updateProject, updateProjectStatus } from "../api";
+import { acknowledgeProjectReview, addFavoriteTicket, createProject, getProjects, hideProject, lookupTicket, unhideProject, updateProject, updateProjectStatus } from "../api";
 import { currentMonth, formatMinutes } from "../format";
 import { projectHasRecurringBilling } from "../recurring-billings";
 import { ticketPattern } from "../timers";
@@ -1359,6 +1359,21 @@ export function ProjectsPage({ onNavigate, onStartTimer }: ProjectsPageProps) {
     }
   }
 
+  async function acknowledgeProjectReviewCheck(project: ProjectSummary) {
+    setSavingProjectStatusId(project.id);
+    try {
+      await acknowledgeProjectReview(project.id);
+      toast.success("Prüfung bestätigt");
+      await load();
+    } catch (error) {
+      toast.error("Prüfung konnte nicht bestätigt werden", {
+        description: error instanceof Error ? error.message : "Unbekannter Fehler"
+      });
+    } finally {
+      setSavingProjectStatusId(null);
+    }
+  }
+
   async function saveProjectFavorite(project: ProjectSummary) {
     try {
       await addFavoriteTicket(project.ticket_number);
@@ -1649,7 +1664,7 @@ export function ProjectsPage({ onNavigate, onStartTimer }: ProjectsPageProps) {
               const remaining = projectRemaining(project, viewSettings.standardTeamspaceOnly);
               const usedPercent = projectConsumptionPercent(project, viewSettings.standardTeamspaceOnly);
               const showBudgetedTeamspaceEntries = !viewSettings.standardTeamspaceOnly && budgetedTeamspaceEntries.length > 1;
-              const canEditProject = project.can_edit !== false;
+              const canEditProject = project.can_edit === true;
 
               return (
                 <div key={project.id} className="border-b last:border-b-0">
@@ -1769,9 +1784,26 @@ export function ProjectsPage({ onNavigate, onStartTimer }: ProjectsPageProps) {
                   </p>
                 ) : null}
                 {project.close_review_required ? (
-                  <p className="rounded-md border border-amber-500/30 bg-amber-500/10 px-2 py-1 text-xs text-amber-700 dark:text-amber-300">
+                  <div className="flex flex-col gap-2 rounded-md border border-amber-500/30 bg-amber-500/10 px-2 py-1 text-xs text-amber-700 dark:text-amber-300 sm:flex-row sm:items-center sm:justify-between">
-                    Zammad meldet das Consulting-Ticket als geschlossen. Bitte Zeiten in Teamspace und TicketTracker prüfen und das Projekt danach schließen.
+                    <span>
-                  </p>
+                      {project.zammad_merged_from_ticket_id || project.zammad_state_id !== "4"
+                        ? project.zammad_merged_from_ticket_id
+                          ? `Dieses Projekt wurde aus ${project.zammad_merged_from_ticket_number ?? `Zammad-ID ${project.zammad_merged_from_ticket_id}`} übernommen. Teamspace-Projekte und Budget bleiben lokal erhalten; bitte in Zammad prüfen und nachtragen.`
+                          : "Dieses Projekt steht zur TS/TT-Prüfung, obwohl das Zammad-Ticket offen ist. Teamspace-Projekte und Budget bleiben lokal erhalten; bitte in Zammad prüfen und nachtragen."
+                        : "Zammad meldet das Consulting-Ticket als geschlossen. Bitte Zeiten in Teamspace und TicketTracker prüfen und das Projekt danach schließen."}
+                    </span>
+                    <Button
+                      type="button"
+                      variant="outline"
+                      size="sm"
+                      className="h-7 shrink-0 px-2 text-xs"
+                      disabled={savingProjectStatusId === project.id || !canEditProject}
+                      onClick={() => void acknowledgeProjectReviewCheck(project)}
+                    >
+                      <CheckCircle2 className="mr-1.5 h-3.5 w-3.5" />
+                      Geprüft
+                    </Button>
+                  </div>
                 ) : null}
                 {showBudgetedTeamspaceEntries ? (
                   <div className="grid gap-1.5 md:grid-cols-2">

frontend/src/views/StatisticsPage.tsx

@@ -1,9 +1,11 @@
 import {
   ChevronLeft,
   ChevronRight,
+  BellPlus,
   CircleAlert,
   Clock3,
   ExternalLink,
+  ListChecks,
   RotateCcw,
   Ticket,
   TrendingUp,
@@ -20,11 +22,12 @@ import { Card, CardContent, CardDescription, CardHeader, CardTitle } from "@/com
 import { Input } from "@/components/ui/input";
 import { Pagination, PaginationContent, PaginationItem, PaginationNext, PaginationPrevious } from "@/components/ui/pagination";
 import { Progress } from "@/components/ui/progress";
+import { Tabs, TabsContent, TabsList, TabsTrigger } from "@/components/ui/tabs";
 import { Table, TableBody, TableCell, TableHead, TableHeader, TableRow } from "@/components/ui/table";
 import { HelpLink } from "@/components/HelpLink";
-import { getStatisticsOverview } from "../api";
+import { getProjectFollowups, getStatisticsOverview } from "../api";
-import { currentMonth, formatDate, formatMinutes } from "../format";
+import { currentMonth, formatDate, formatDateTime, formatMinutes } from "../format";
-import type { StatisticsDailyBucket, StatisticsGroup, StatisticsOverview, StatisticsTicket, WorkType } from "../types";
+import type { StatisticsDailyBucket, StatisticsGroup, StatisticsOverview, StatisticsProjectFollowup, StatisticsProjectFollowupOverview, StatisticsTicket, WorkType } from "../types";
 
 type StatisticsPageProps = {
   onNavigate: (to: string) => void;
@@ -361,12 +364,72 @@ function TicketHotspot({ ticket, month, onNavigate }: { ticket: StatisticsTicket
   );
 }
 
+function daysSince(value: string) {
+  const then = new Date(value).getTime();
+
+  if (!Number.isFinite(then)) {
+    return null;
+  }
+
+  return Math.max(0, Math.floor((Date.now() - then) / 86_400_000));
+}
+
+function ProjectFollowupRow({ project, onNavigate }: { project: StatisticsProjectFollowup; onNavigate: (to: string) => void }) {
+  const inactiveDays = daysSince(project.latest_tt_update);
+  const hasBudget = project.hour_budget_minutes !== null;
+
+  return (
+    <div className="grid gap-3 rounded-md border bg-background p-3 lg:grid-cols-[minmax(0,1fr)_auto] lg:items-center">
+      <div className="min-w-0 space-y-2">
+        <div className="flex flex-wrap items-center gap-2">
+          <span className="font-semibold">{project.ticket_number}</span>
+          {hasBudget ? (
+            <Badge variant={project.remaining_minutes !== null && project.remaining_minutes > 0 ? "warning" : "secondary"}>
+              {project.remaining_minutes !== null && project.remaining_minutes > 0 ? `${formatMinutes(project.remaining_minutes)} offen` : "Budget verbraucht"}
+            </Badge>
+          ) : (
+            <Badge variant="info">ohne Budget</Badge>
+          )}
+          {project.open_followup_todo_id ? <Badge variant="secondary">ToDo erstellt</Badge> : null}
+          {project.followup_state === "done" ? <Badge variant="success">erledigt</Badge> : null}
+          {project.followup_state === "dismissed" ? <Badge variant="outline">gelöscht</Badge> : null}
+          {project.overdue_todos > 0 ? <Badge variant="destructive">{project.overdue_todos} überfällig</Badge> : null}
+        </div>
+        <div className="min-w-0">
+          <p className="truncate text-sm">{project.title ?? project.teamspace_project ?? "Projekt ohne Titel"}</p>
+          <p className="truncate text-xs text-muted-foreground">{project.organization_name ?? "Keine Organisation"}</p>
+        </div>
+        <div className="flex flex-wrap gap-x-3 gap-y-1 text-xs text-muted-foreground">
+          <span>Letztes TT-Update {formatDateTime(project.latest_tt_update)}</span>
+          {inactiveDays !== null ? <span>{inactiveDays} Tag(e) inaktiv</span> : null}
+          <span>Budget {hasBudget ? formatMinutes(project.hour_budget_minutes!) : "nicht gesetzt"}</span>
+          <span>Verbraucht {formatMinutes(project.consumption_minutes)}</span>
+          <span>{project.open_todos} offene ToDo(s)</span>
+        </div>
+      </div>
+      <div className="flex flex-wrap gap-2 lg:justify-end">
+        <Button variant="secondary" size="sm" onClick={() => onNavigate(`/tickets/${project.ticket_id}?month=${currentMonth()}`)}>
+          Ticket
+          <ExternalLink className="size-4" />
+        </Button>
+        <Button variant="secondary" size="sm" onClick={() => onNavigate("/projects")}>
+          Projekte
+          <ExternalLink className="size-4" />
+        </Button>
+      </div>
+    </div>
+  );
+}
+
 export function StatisticsPage({ onNavigate }: StatisticsPageProps) {
   const [month, setMonth] = useState(currentMonth());
   const [stats, setStats] = useState<StatisticsOverview | null>(null);
+  const [followups, setFollowups] = useState<StatisticsProjectFollowupOverview | null>(null);
   const [loading, setLoading] = useState(false);
+  const [loadingFollowups, setLoadingFollowups] = useState(false);
   const [organizationPage, setOrganizationPage] = useState(1);
   const loadRequestId = useRef(0);
+  const followupRequestId = useRef(0);
 
   async function load() {
     const requestId = loadRequestId.current + 1;
@@ -396,6 +459,44 @@ export function StatisticsPage({ onNavigate }: StatisticsPageProps) {
     void load();
   }, [month]);
 
+  async function loadFollowups() {
+    const requestId = followupRequestId.current + 1;
+    followupRequestId.current = requestId;
+    setLoadingFollowups(true);
+
+    try {
+      const result = await getProjectFollowups();
+
+      if (requestId === followupRequestId.current) {
+        setFollowups(result);
+
+        if (result.createdTodos > 0 || result.updatedTodos > 0) {
+          window.dispatchEvent(new Event("tickettracker:todos-changed"));
+        }
+
+        if (result.createdTodos > 0) {
+          toast.success("Wiedervorlagen erstellt", {
+            description: `${result.createdTodos} ToDo(s) automatisch angelegt.`
+          });
+        }
+      }
+    } catch (error) {
+      if (requestId === followupRequestId.current) {
+        toast.error("Wiedervorlagen konnten nicht geladen werden", {
+          description: error instanceof Error ? error.message : "Unbekannter Fehler"
+        });
+      }
+    } finally {
+      if (requestId === followupRequestId.current) {
+        setLoadingFollowups(false);
+      }
+    }
+  }
+
+  useEffect(() => {
+    void loadFollowups();
+  }, []);
+
   useEffect(() => {
     function refreshVisible() {
       if (document.visibilityState === "visible") {
@@ -476,6 +577,15 @@ export function StatisticsPage({ onNavigate }: StatisticsPageProps) {
         </div>
       </div>
 
+      <Tabs defaultValue="overview" className="space-y-5">
+        <TabsList className="grid h-auto w-full grid-cols-2 gap-1 sm:grid-cols-4">
+          <TabsTrigger value="overview">Überblick</TabsTrigger>
+          <TabsTrigger value="groups">Kunden & Typen</TabsTrigger>
+          <TabsTrigger value="tickets">Tickets</TabsTrigger>
+          <TabsTrigger value="followups">Wiedervorlagen</TabsTrigger>
+        </TabsList>
+
+        <TabsContent value="overview" className="space-y-5">
       <div className="grid gap-3 sm:grid-cols-2 xl:grid-cols-4">
         <MetricCard
           label="Abgerechnet"
@@ -597,6 +707,9 @@ export function StatisticsPage({ onNavigate }: StatisticsPageProps) {
         </CardContent>
       </Card>
 
+        </TabsContent>
+
+        <TabsContent value="groups" className="space-y-5">
       <div className="grid gap-3 xl:grid-cols-[1.45fr_0.8fr]">
         <Card>
           <CardHeader className="gap-3 p-4 sm:flex-row sm:items-start sm:justify-between sm:space-y-0">
@@ -731,6 +844,9 @@ export function StatisticsPage({ onNavigate }: StatisticsPageProps) {
         </Card>
       </div>
 
+        </TabsContent>
+
+        <TabsContent value="tickets" className="space-y-5">
       <Card>
         <CardHeader className="gap-3 p-4 sm:flex-row sm:items-start sm:justify-between sm:space-y-0">
           <div>
@@ -768,6 +884,48 @@ export function StatisticsPage({ onNavigate }: StatisticsPageProps) {
           </CardContent>
         </Card>
       ) : null}
+        </TabsContent>
+
+        <TabsContent value="followups" className="space-y-5">
+          <Card>
+            <CardHeader className="gap-3 p-4 sm:flex-row sm:items-start sm:justify-between sm:space-y-0">
+              <div>
+                <CardTitle>Automatische Wiedervorlagen</CardTitle>
+                <CardDescription>
+                  {followups?.enabled === false
+                    ? "Automatische Wiedervorlagen sind im Profil deaktiviert."
+                    : followups?.secondEnabled === false
+                      ? `Erste Wiedervorlage nach ${followups?.weeks ?? "-"} Woche(n).`
+                      : `Erste Wiedervorlage nach ${followups?.weeks ?? "-"} Woche(n), zweite nach weiteren ${followups?.secondWeeks ?? "-"} Woche(n) ohne Session.`}
+                </CardDescription>
+              </div>
+              <div className="flex items-center gap-2">
+                <Badge variant="outline">{followups?.projects.length ?? 0} Projekt(e)</Badge>
+                {loadingFollowups ? <Badge variant="secondary">lädt...</Badge> : null}
+                <Button type="button" size="sm" variant="secondary" onClick={() => void loadFollowups()} disabled={loadingFollowups}>
+                  <BellPlus className="size-4" />
+                  Prüfen
+                </Button>
+              </div>
+            </CardHeader>
+            <CardContent className="space-y-3 px-4 pb-4">
+              {(followups?.projects ?? []).map((project) => (
+                <ProjectFollowupRow key={project.project_id} project={project} onNavigate={onNavigate} />
+              ))}
+              {!loadingFollowups && followups && followups.projects.length === 0 ? (
+                <div className="grid place-items-center gap-2 rounded-md border bg-muted/20 p-8 text-center">
+                  <ListChecks className="size-8 text-muted-foreground" />
+                  <div>
+                    <p className="font-medium">Keine Wiedervorlagen nötig</p>
+                    <p className="text-sm text-muted-foreground">Alle offenen Projektbudgets wurden innerhalb des eingestellten Zeitraums aktualisiert.</p>
+                  </div>
+                </div>
+              ) : null}
+              {loadingFollowups && !followups ? <p className="py-8 text-center text-sm text-muted-foreground">Wiedervorlagen werden geprüft...</p> : null}
+            </CardContent>
+          </Card>
+        </TabsContent>
+      </Tabs>
     </div>
   );
 }

frontend/src/views/TicketDetailPage.tsx

@@ -15,6 +15,7 @@ import { OrganizationSelect } from "@/components/OrganizationSelect";
 import { readRichActivityEditorValue, RichActivityEditor } from "@/components/RichActivityEditor";
 import { TodoPanel } from "@/components/TodoPanel";
 import {
+  acknowledgeProjectReview,
   createSession,
   deleteProject,
   deleteSession,
@@ -128,6 +129,10 @@ function notifyZammadArticleResult(result: CreateSessionResult) {
   }
 }
 
+function notifyTodosChanged() {
+  window.dispatchEvent(new Event("tickettracker:todos-changed"));
+}
+
 function zammadSyncStorageKey(userId: string) {
   return `tickettracker.zammad-sync.${userId}`;
 }
@@ -258,6 +263,18 @@ function teamspaceBillingKey(day: string, projectTeamspaceEntryId: string | null
   return `${projectTeamspaceEntryId ?? "ticket"}::${day}`;
 }
 
+function dayBillingProjectEntryIdForView(
+  projectTeamspaceEntryId: string | null | undefined,
+  hasMultipleProjectTeamspaceEntries: boolean,
+  defaultProjectEntryId: string | null
+) {
+  if (!hasMultipleProjectTeamspaceEntries) {
+    return null;
+  }
+
+  return projectTeamspaceEntryId ?? defaultProjectEntryId;
+}
+
 function projectEditForm(project: ProjectSummary): ProjectEditFormState {
   const entries = projectTeamspaceEntries(project).map((entry, index) => ({
     clientId: entry.id || projectEntryId(),
@@ -823,10 +840,12 @@ export function TicketDetailPage({ periodType, period, ticketId, onNavigate, onS
   }, [periodType, period, ticketId]);
 
   useEffect(() => {
-    const defaultEntryId = data?.project ? projectTeamspaceEntries(data.project).find((entry) => entry.is_default)?.id ?? null : null;
+    const loadedProjectEntries = data?.project ? projectTeamspaceEntries(data.project) : [];
+    const hasMultipleEntries = loadedProjectEntries.length > 1;
+    const defaultEntryId = loadedProjectEntries.find((entry) => entry.is_default)?.id ?? null;
     const nextInputs = Object.fromEntries(
       (data?.dayBillings ?? []).map((billing) => [
-        teamspaceBillingKey(billing.day, billing.project_teamspace_entry_id ?? defaultEntryId),
+        teamspaceBillingKey(billing.day, dayBillingProjectEntryIdForView(billing.project_teamspace_entry_id, hasMultipleEntries, defaultEntryId)),
         formatHoursInput(billing.billed_minutes)
       ])
     );
@@ -893,8 +912,17 @@ export function TicketDetailPage({ periodType, period, ticketId, onNavigate, onS
   const projectBudgetMinutes = project?.hour_budget_minutes ?? null;
   const projectConsumptionUsagePercent = project ? projectConsumptionPercent(projectConsumptionMinutes, projectBudgetMinutes) : null;
   const projectRemainingMinutes = projectBudgetMinutes && projectBudgetMinutes > 0 ? projectBudgetMinutes - projectConsumptionMinutes : null;
-  const canEditProject = project?.can_edit !== false;
+  const canEditProject = project?.can_edit === true;
-  const canEditTicketData = !project || canEditProject;
+  const ticketManagedByZammad = Boolean(ticket?.zammad_ticket_id);
+  const canEditTicketData = ticket?.can_edit_ticket_data === true;
+  const zammadOwnerLabel = ticket?.zammad_owner_display_name
+    || ticket?.zammad_owner_username
+    || (ticket?.zammad_owner_id ? `Zammad-Owner ${ticket.zammad_owner_id}` : null);
+  const projectOwnerLabel = project?.owner_display_name
+    || project?.owner_username
+    || (project?.zammad_owner_id ? `Zammad-Owner ${project.zammad_owner_id}` : null)
+    || zammadOwnerLabel;
+  const currentZammadUserLabel = currentUser.zammad_user_id ? `Zammad-User ${currentUser.zammad_user_id}` : "dein Zammad-User";
   const isProject = Boolean(project);
   const isGlobalTicket = periodType === "all";
   const isPeriodClosed = Boolean(data?.closed);
@@ -919,11 +947,11 @@ export function TicketDetailPage({ periodType, period, ticketId, onNavigate, onS
     () =>
       new Map(
         (data?.dayBillings ?? []).map((billing) => [
-          teamspaceBillingKey(billing.day, billing.project_teamspace_entry_id ?? defaultProjectEntryId),
+          teamspaceBillingKey(billing.day, dayBillingProjectEntryIdForView(billing.project_teamspace_entry_id, requiresProjectTeamspaceEntry, defaultProjectEntryId)),
           billing.billed_minutes
         ])
       ),
-    [data?.dayBillings, defaultProjectEntryId]
+    [data?.dayBillings, defaultProjectEntryId, requiresProjectTeamspaceEntry]
   );
   const savedDayBillingInput = (key: string) => formatHoursInput(dayBillingMap.get(key));
   const isDayBillingDirty = (key: string) => (dayBillingInputs[key] ?? "") !== savedDayBillingInput(key);
@@ -1026,6 +1054,7 @@ export function TicketDetailPage({ periodType, period, ticketId, onNavigate, onS
   const periodTeamspaceMinutes = (data?.dayBillings ?? []).reduce((sum, billing) => sum + Number(billing.billed_minutes ?? 0), 0);
   const ticketDataDirty = Boolean(
     ticket &&
+      canEditTicketData &&
       (editTicketNumber !== ticket.ticket_number ||
         editTicketTitle !== (ticket.title ?? "") ||
         editOrganizationId !== (ticket.organization_id ?? "") ||
@@ -1185,6 +1214,9 @@ export function TicketDetailPage({ periodType, period, ticketId, onNavigate, onS
         : `${result.created} angelegt, ${result.skipped} ohne Transfer.`;
       const notify = result.created === 0 && result.errors.length > 0 ? toast.error : toast.success;
       notify("Mail-Sessions importiert", { description });
+      if (result.created > 0) {
+        notifyTodosChanged();
+      }
       await load();
     } catch (error) {
       toast.error("Mail-Sessions konnten nicht importiert werden", {
@@ -1262,8 +1294,10 @@ export function TicketDetailPage({ periodType, period, ticketId, onNavigate, onS
     }
 
     if (!canEditTicketData) {
-      toast.error("Projekt ist geteilt", {
+      toast.error(ticketManagedByZammad ? "Ticketdaten kommen aus Zammad" : "Ticket gehört einem anderen Owner", {
-        description: "Nur der Zammad-Owner kann Ticket- und Projektdaten ändern."
+        description: ticketManagedByZammad
+          ? "Nummer, Art, Titel und Organisation werden durch den Zammad-Sync verwaltet."
+          : "Nur der Owner kann Ticketdaten ändern."
       });
       return;
     }
@@ -1312,7 +1346,7 @@ export function TicketDetailPage({ periodType, period, ticketId, onNavigate, onS
       return;
     }
 
-    if (project.can_edit === false) {
+    if (!canEditProject) {
       toast.error("Projekt ist geteilt", {
         description: "Nur der Zammad-Owner kann die Projektdaten bearbeiten."
       });
@@ -1330,7 +1364,7 @@ export function TicketDetailPage({ periodType, period, ticketId, onNavigate, onS
       return;
     }
 
-    if (project.can_edit === false) {
+    if (!canEditProject) {
       toast.error("Projekt ist geteilt", {
         description: "Nur der Zammad-Owner kann die Projektdaten bearbeiten."
       });
@@ -1385,7 +1419,7 @@ export function TicketDetailPage({ periodType, period, ticketId, onNavigate, onS
       return;
     }
 
-    if (project.can_edit === false) {
+    if (!canEditProject) {
       toast.error("Projekt ist geteilt", {
         description: "Nur der Zammad-Owner kann den Projektstatus ändern."
       });
@@ -1406,6 +1440,32 @@ export function TicketDetailPage({ periodType, period, ticketId, onNavigate, onS
     }
   }
 
+  async function acknowledgeProjectReviewCheck() {
+    if (!project) {
+      return;
+    }
+
+    if (!canEditProject) {
+      toast.error("Projekt ist geteilt", {
+        description: "Nur der Zammad-Owner kann die Prüfung bestätigen."
+      });
+      return;
+    }
+
+    setSavingProjectStatus(true);
+    try {
+      await acknowledgeProjectReview(project.id);
+      toast.success("Prüfung bestätigt");
+      await load();
+    } catch (error) {
+      toast.error("Prüfung konnte nicht bestätigt werden", {
+        description: error instanceof Error ? error.message : "Unbekannter Fehler"
+      });
+    } finally {
+      setSavingProjectStatus(false);
+    }
+  }
+
   async function submitTicketSession(event: FormEvent) {
     event.preventDefault();
 
@@ -1487,6 +1547,7 @@ export function TicketDetailPage({ periodType, period, ticketId, onNavigate, onS
         description: "Der Eintrag wurde diesem Ticket zugeordnet. Betroffene Abschlüsse wurden wieder geöffnet."
       });
       notifyZammadArticleResult(result);
+      notifyTodosChanged();
       setTicketSession({
         ...emptyTicketSessionForm(),
         organizationId: ticket.organization_id ?? "",
@@ -1762,6 +1823,26 @@ export function TicketDetailPage({ periodType, period, ticketId, onNavigate, onS
         </Alert>
       ) : null}
 
+      {ticket?.is_foreign_zammad_owner ? (
+        <Alert className="py-3 text-sm">
+          <AlertCircle className="size-4" />
+          <AlertTitle>Anderer Zammad-Owner</AlertTitle>
+          <AlertDescription>
+            Dieses Ticket gehört in Zammad {zammadOwnerLabel ? `${zammadOwnerLabel}` : "einem anderen Owner"}; du bist {currentZammadUserLabel}. Du kannst deine Sessions sehen, Projekt- und Ticketdaten sind für dich geschützt.
+          </AlertDescription>
+        </Alert>
+      ) : null}
+
+      {ticketManagedByZammad ? (
+        <Alert className="py-3 text-sm">
+          <AlertCircle className="size-4" />
+          <AlertTitle>Ticketdaten werden von Zammad verwaltet</AlertTitle>
+          <AlertDescription>
+            Nummer, Art, Titel und Organisation wurden durch den Zammad-Sync übernommen und können in TicketTracker nicht manuell geändert werden.
+          </AlertDescription>
+        </Alert>
+      ) : null}
+
       <div className="grid gap-4">
         <Card>
           <CardHeader className="p-4 pb-2">
@@ -1771,7 +1852,9 @@ export function TicketDetailPage({ periodType, period, ticketId, onNavigate, onS
                 <CardDescription>
                   {canEditTicketData
                     ? "Änderungen an Organisation und Art werden auf alle vorhandenen Sessions dieses Tickets übernommen."
-                    : "Dieses Projekt ist geteilt. Nur der Zammad-Owner kann Ticket- und Projektdaten ändern."}
+                    : ticketManagedByZammad
+                      ? "Nummer, Art, Titel und Organisation kommen aus Zammad und sind lokal gesperrt."
+                      : "Nur der Owner kann Ticketdaten ändern."}
                 </CardDescription>
               </div>
               <HelpLink anchor="ticketdaten" label="Hilfe zu Ticketdaten" />
@@ -1842,8 +1925,8 @@ export function TicketDetailPage({ periodType, period, ticketId, onNavigate, onS
                   {(project.unassigned_teamspace_session_count ?? 0) > 0 ? <Badge variant="warning">{project.unassigned_teamspace_session_count} ohne TS</Badge> : null}
                 </CardTitle>
                 <CardDescription>
-                  {!canEditProject && project.owner_display_name
+                  {!canEditProject && projectOwnerLabel
-                    ? `Eigentümer: ${project.owner_display_name}`
+                    ? `Eigentümer: ${projectOwnerLabel}`
                     : showBudgetedProjectEntries
                       ? `${budgetedProjectEntries.length} budgetierte Teamspace-Einträge`
                       : budgetedProjectEntries[0] ? teamspaceEntryDisplayLabel(budgetedProjectEntries[0]) : project.teamspace_project || "Kein Teamspace-Projekt hinterlegt"}
@@ -1879,9 +1962,28 @@ export function TicketDetailPage({ periodType, period, ticketId, onNavigate, onS
             ) : null}
             {project.close_review_required ? (
               <Alert variant="warning">
-                <div className="font-medium">Zeiten prüfen</div>
+                <div className="flex flex-col gap-3 sm:flex-row sm:items-start sm:justify-between">
+                  <div className="space-y-1">
+                    <div className="font-medium">{project.zammad_merged_from_ticket_id || project.zammad_state_id !== "4" ? "Merge prüfen" : "Zeiten prüfen"}</div>
                     <div className="text-sm text-muted-foreground">
-                  Zammad meldet dieses Consulting-Ticket als geschlossen. Bitte Zeiten in Teamspace und TicketTracker prüfen und das Projekt danach schließen.
+                      {project.zammad_merged_from_ticket_id || project.zammad_state_id !== "4"
+                        ? project.zammad_merged_from_ticket_id
+                          ? `Dieses Projekt wurde aus ${project.zammad_merged_from_ticket_number ?? `Zammad-ID ${project.zammad_merged_from_ticket_id}`} übernommen. Teamspace-Projekte, Budget und Zuordnungen bleiben lokal erhalten; bitte in Zammad prüfen und nachtragen.`
+                          : "Dieses Projekt steht zur TS/TT-Prüfung, obwohl das Zammad-Ticket offen ist. Teamspace-Projekte, Budget und Zuordnungen bleiben lokal erhalten; bitte in Zammad prüfen und nachtragen."
+                        : "Zammad meldet dieses Consulting-Ticket als geschlossen. Bitte Zeiten in Teamspace und TicketTracker prüfen und das Projekt danach schließen."}
+                    </div>
+                  </div>
+                  <Button
+                    type="button"
+                    variant="outline"
+                    size="sm"
+                    className="shrink-0"
+                    disabled={savingProjectStatus || !canEditProject}
+                    onClick={() => void acknowledgeProjectReviewCheck()}
+                  >
+                    <CheckCircle2 className="mr-2 h-4 w-4" />
+                    Geprüft
+                  </Button>
                 </div>
               </Alert>
             ) : null}

frontend/src/views/TimerPage.tsx

@@ -141,6 +141,10 @@ function notifyZammadArticleResult(result: CreateSessionResult) {
   }
 }
 
+function notifyTodosChanged() {
+  window.dispatchEvent(new Event("tickettracker:todos-changed"));
+}
+
 function escapeHtml(value: string) {
   return value
     .replace(/&/g, "&")
@@ -773,6 +777,7 @@ export function TimerPage({ timers, setTimers, selectedTimerId, setSelectedTimer
         description: `${finished.ticketNumber} wurde mit ${finished.roundedMinutes} Minute(n) erfasst.`
       });
       notifyZammadArticleResult(result);
+      notifyTodosChanged();
       try {
         const timerResult = await deleteActiveTimer(finished.timerId);
         removeTimerActivityDraft(currentUser.id, finished.timerId);
@@ -868,6 +873,7 @@ export function TimerPage({ timers, setTimers, selectedTimerId, setSelectedTimer
         description: manualLookupTicket?.is_project ? "Der Eintrag wurde dem Projekt zugeordnet." : "Der Eintrag ist in deiner Ticketliste offen."
       });
       notifyZammadArticleResult(result);
+      notifyTodosChanged();
       setManualSession({
         ...emptyManualSession(),
         day: manualSession.day,

frontend/src/views/TodosPage.tsx

@@ -21,6 +21,7 @@ type TodosPageProps = {
 
 type TodoSortMode = "custom" | "priority" | "title" | "ticket" | "organization" | "date" | "updated";
 type TodoGroupMode = "ticket" | "priority" | "organization" | "status";
+type CalendarDayMode = "current";
 
 type TodoPreferences = {
   status: TodoStatus | "all";
@@ -277,6 +278,23 @@ function sortTodos(todos: TicketTodo[], sortMode: TodoSortMode) {
   return [...todos].sort((left, right) => compareTodos(left, right, sortMode));
 }
 
+function uniqueTodos(todos: TicketTodo[]) {
+  return todos.filter((todo, index, list) => list.findIndex((item) => item.id === todo.id) === index);
+}
+
+function sortCurrentTodos(todos: TicketTodo[], today: string) {
+  return [...todos].sort((left, right) => {
+    const leftOverdue = isTodoOverdue(left, today);
+    const rightOverdue = isTodoOverdue(right, today);
+
+    if (leftOverdue !== rightOverdue) {
+      return leftOverdue ? -1 : 1;
+    }
+
+    return priorityOrder[left.priority] - priorityOrder[right.priority] || left.sort_order - right.sort_order || compareText(left.title, right.title);
+  });
+}
+
 function matchesTicketSearch(todo: TicketTodo, search: string) {
   const normalizedSearch = normalizeSearch(search);
 
@@ -400,9 +418,9 @@ export function TodosPage({ onNavigate }: TodosPageProps) {
   const [modalEndsOn, setModalEndsOn] = useState("");
   const [modalBusy, setModalBusy] = useState(false);
   const [selectedCalendarDay, setSelectedCalendarDay] = useState<string | null>(null);
-  const [selectedCalendarDayMode, setSelectedCalendarDayMode] = useState<"summarized" | "overdue">("summarized");
+  const [selectedCalendarDayMode, setSelectedCalendarDayMode] = useState<CalendarDayMode>("current");
   const [returnCalendarDay, setReturnCalendarDay] = useState<string | null>(null);
-  const [returnCalendarDayMode, setReturnCalendarDayMode] = useState<"summarized" | "overdue">("summarized");
+  const [returnCalendarDayMode, setReturnCalendarDayMode] = useState<CalendarDayMode>("current");
 
   async function load() {
     setLoading(true);
@@ -422,6 +440,13 @@ export function TodosPage({ onNavigate }: TodosPageProps) {
     void load();
   }, []);
 
+  useEffect(() => {
+    const onTodosChanged = () => void load();
+
+    window.addEventListener("tickettracker:todos-changed", onTodosChanged);
+    return () => window.removeEventListener("tickettracker:todos-changed", onTodosChanged);
+  }, []);
+
   useEffect(() => {
     window.localStorage.setItem(todoPreferencesKey, JSON.stringify(preferences));
   }, [preferences]);
@@ -432,7 +457,7 @@ export function TodosPage({ onNavigate }: TodosPageProps) {
     if (selectedTodoId && !selectedTodo) {
       setSelectedTodoId(null);
       setReturnCalendarDay(null);
-      setReturnCalendarDayMode("summarized");
+      setReturnCalendarDayMode("current");
     }
   }, [selectedTodo, selectedTodoId]);
 
@@ -473,7 +498,19 @@ export function TodosPage({ onNavigate }: TodosPageProps) {
 
     return entries;
   }, [calendarDays, todos]);
-  const selectedCalendarDayTodos = selectedCalendarDay ? calendarTodosByDay.get(selectedCalendarDay)?.[selectedCalendarDayMode] ?? [] : [];
+  const selectedCalendarDayTodos = useMemo(() => {
+    if (!selectedCalendarDay) {
+      return [];
+    }
+
+    const dayTodos = calendarTodosByDay.get(selectedCalendarDay);
+
+    if (!dayTodos) {
+      return [];
+    }
+
+    return sortCurrentTodos(uniqueTodos([...dayTodos.overdue, ...dayTodos.single, ...dayTodos.summarized]), currentDay());
+  }, [calendarTodosByDay, selectedCalendarDay]);
   const counts = useMemo(
     () => ({
       open: todos.filter((todo) => todo.status === "open").length,
@@ -531,7 +568,7 @@ export function TodosPage({ onNavigate }: TodosPageProps) {
     });
   }
 
-  function openTodoModal(todo: TicketTodo, returnToDay: string | null = null, returnToDayMode: "summarized" | "overdue" = "summarized") {
+  function openTodoModal(todo: TicketTodo, returnToDay: string | null = null, returnToDayMode: CalendarDayMode = "current") {
     setReturnCalendarDay(returnToDay);
     setReturnCalendarDayMode(returnToDayMode);
     setSelectedTodoId(todo.id);
@@ -545,7 +582,7 @@ export function TodosPage({ onNavigate }: TodosPageProps) {
   function closeTodoModal() {
     setSelectedTodoId(null);
     setReturnCalendarDay(null);
-    setReturnCalendarDayMode("summarized");
+    setReturnCalendarDayMode("current");
   }
 
   function backToCalendarDay() {
@@ -557,7 +594,7 @@ export function TodosPage({ onNavigate }: TodosPageProps) {
     const mode = returnCalendarDayMode;
     setSelectedTodoId(null);
     setReturnCalendarDay(null);
-    setReturnCalendarDayMode("summarized");
+    setReturnCalendarDayMode("current");
     setSelectedCalendarDayMode(mode);
     setSelectedCalendarDay(day);
   }
@@ -904,6 +941,9 @@ export function TodosPage({ onNavigate }: TodosPageProps) {
               const summarizedTodos = dayTodos.summarized;
               const overdueTodos = dayTodos.overdue;
               const totalTodos = singleTodos.length + summarizedTodos.length + overdueTodos.length;
+              const currentTodos = sortCurrentTodos(uniqueTodos([...overdueTodos, ...singleTodos, ...summarizedTodos]), currentDay());
+              const visibleCalendarTodos = currentTodos.slice(0, 2);
+              const additionalTodosCount = Math.max(0, currentTodos.length - visibleCalendarTodos.length);
 
               return (
                 <div
@@ -918,7 +958,7 @@ export function TodosPage({ onNavigate }: TodosPageProps) {
                   </div>
                   {!day.workingDay ? <div className="text-[10px] leading-tight text-muted-foreground">{day.holidayName ?? "Wochenende"}</div> : null}
                   <div className="space-y-1">
-                    {singleTodos.slice(0, 3).map((todo) => (
+                    {visibleCalendarTodos.map((todo) => (
                       <button
                         key={todo.id}
                         type="button"
@@ -929,31 +969,18 @@ export function TodosPage({ onNavigate }: TodosPageProps) {
                         <span className="block truncate text-muted-foreground">{todo.ticket_number ?? "Ticket"}</span>
                       </button>
                     ))}
-                    {singleTodos.length > 3 ? <span className="block px-1 text-[11px] text-muted-foreground">+{singleTodos.length - 3} weitere fixe</span> : null}
                   </div>
-                  <div className="mt-auto flex flex-wrap gap-1 pt-1">
+                  <div className="mt-auto pt-1">
-                    {summarizedTodos.length > 0 ? (
+                    {additionalTodosCount > 0 ? (
                       <button
                         type="button"
-                        className="min-w-0 flex-1 rounded-md border border-muted-foreground/20 bg-background/60 px-2 py-1 text-left text-[11px] leading-tight text-muted-foreground hover:bg-muted"
+                        className="block w-full rounded-md border border-muted-foreground/20 bg-background/60 px-2 py-1 text-left text-[11px] leading-tight text-muted-foreground hover:bg-muted"
                         onClick={() => {
-                          setSelectedCalendarDayMode("summarized");
+                          setSelectedCalendarDayMode("current");
                           setSelectedCalendarDay(day.iso);
                         }}
                       >
-                        +{summarizedTodos.length} ToDo{summarizedTodos.length === 1 ? "" : "s"}
+                        +{additionalTodosCount} weitere ToDo{additionalTodosCount === 1 ? "" : "s"}
-                      </button>
-                    ) : null}
-                    {overdueTodos.length > 0 ? (
-                      <button
-                        type="button"
-                        className="shrink-0 rounded-md border border-red-500/50 bg-red-500/10 px-2 py-1 text-left text-[11px] font-semibold leading-tight text-red-200 hover:bg-red-500/20"
-                        onClick={() => {
-                          setSelectedCalendarDayMode("overdue");
-                          setSelectedCalendarDay(day.iso);
-                        }}
-                      >
-                        +{overdueTodos.length} üf
                       </button>
                     ) : null}
                   </div>
@@ -1073,13 +1100,11 @@ export function TodosPage({ onNavigate }: TodosPageProps) {
       <Dialog open={Boolean(selectedCalendarDay)} onOpenChange={(open) => !open && setSelectedCalendarDay(null)}>
         <DialogContent className="max-h-[calc(100dvh-2rem)] overflow-y-auto sm:max-w-xl">
           <DialogHeader>
-            <DialogTitle>{selectedCalendarDayMode === "overdue" ? "Überfällige ToDos" : "ToDos am Tag"}</DialogTitle>
+            <DialogTitle>Aktuelle ToDos</DialogTitle>
             <DialogDescription>
               {selectedCalendarDay
-                ? `${formatTodoDate(selectedCalendarDay)} · ${selectedCalendarDayTodos.length} ${selectedCalendarDayMode === "overdue" ? "überfällige" : "laufende"} ToDo(s)`
+                ? `${formatTodoDate(selectedCalendarDay)} · ${selectedCalendarDayTodos.length} aktuelle ToDo(s)`
-                : selectedCalendarDayMode === "overdue"
+                : "Aktuelle ToDos dieses Tages"}
-                  ? "Überfällige ToDos dieses Tages"
-                  : "Laufende ToDos dieses Tages"}
             </DialogDescription>
           </DialogHeader>
           <div className="space-y-2">
@@ -1142,9 +1167,7 @@ export function TodosPage({ onNavigate }: TodosPageProps) {
               </div>
             ))}
             {selectedCalendarDayTodos.length === 0 ? (
-              <p className="rounded-md border bg-muted/20 p-4 text-center text-sm text-muted-foreground">
+              <p className="rounded-md border bg-muted/20 p-4 text-center text-sm text-muted-foreground">Keine aktuellen ToDos an diesem Tag.</p>
-                {selectedCalendarDayMode === "overdue" ? "Keine überfälligen ToDos an diesem Tag." : "Keine laufenden ToDos an diesem Tag."}
-              </p>
             ) : null}
           </div>
         </DialogContent>

frontend/src/views/ZammadSyncPage.tsx

@@ -433,7 +433,7 @@ function formatChangeValue(field: string, value: unknown) {
     return formatMinutes(value);
   }
 
-  if (field === "Teamspace-Projekte" || field === "Teamspace-Prüfung") {
+  if (field === "Teamspace-Projekte" || field === "Teamspace-Prüfung" || field === "Merge-Projektdaten") {
     return formatTeamspaceProjectList(value) || "-";
   }
 
@@ -493,6 +493,10 @@ function changeAllowedByFields(item: ZammadSyncItem, change: ZammadSyncChange, f
     return fields.projectName && consultingProjectCanBeTouched;
   }
 
+  if (change.field === "Merge-Projektdaten" || change.field === "Merge-Prüfung") {
+    return true;
+  }
+
   if (change.field === "Teamspace-Budget") {
     return fields.budget && consultingProjectCanBeTouched;
   }
@@ -578,6 +582,10 @@ function addCachedTeamspaceProjectChanges(changes: ZammadSyncChange[], localProj
   }
 }
 
+function mergeReviewMatchesCachedZammad(localTeamspaceProjects: unknown, zammadTeamspaceProjects: unknown) {
+  return !cachedValueChanged("Teamspace-Projekte", localTeamspaceProjects, zammadTeamspaceProjects);
+}
+
 function zammadPendingTodoPreview(zammad: Record<string, unknown>) {
   const stateId = numericValue(cachedValue(zammad, "stateId"));
   const pendingTime = cachedValue(zammad, "pendingTime");
@@ -651,6 +659,33 @@ function addCachedChange(changes: ZammadSyncChange[], field: string, from: unkno
   }
 }
 
+const preservedExistingPreviewChangeFields = new Set([
+  "Fremdes Ticket",
+  "Fremder Zammad-Owner",
+  "Owner",
+  "Ticket-Zuordnung",
+  "Hinweis",
+  "Ticketnummer",
+  "TicketTracker-Zusammenführung"
+]);
+
+const informationalExistingPreviewChangeFields = new Set([
+  "Fremdes Ticket",
+  "Fremder Zammad-Owner",
+  "Hinweis"
+]);
+
+function preserveExistingPreviewChanges(item: ZammadSyncItem, changes: ZammadSyncChange[], fields: ZammadSyncExistingFields) {
+  const existingFields = new Set(changes.map((change) => change.field));
+
+  const resultChanges = [
+    ...item.changes.filter((change) => preservedExistingPreviewChangeFields.has(change.field) && !existingFields.has(change.field) && changeAllowedByFields(item, change, fields)),
+    ...changes
+  ];
+
+  return resultChanges.some((change) => !informationalExistingPreviewChangeFields.has(change.field)) ? resultChanges : [];
+}
+
 function changesFromExistingPreviewCache(item: ZammadSyncItem, fields: ZammadSyncExistingFields) {
   if (!item.zammad) {
     return item.changes.filter((change) => changeAllowedByFields(item, change, fields));
@@ -666,6 +701,11 @@ function changesFromExistingPreviewCache(item: ZammadSyncItem, fields: ZammadSyn
   const localWorkType = cachedValue(local, "workType");
   const zammadWorkType = cachedValue(zammad, "workType");
   const zammadStateId = numericValue(cachedValue(zammad, "stateId"));
+  const mergeProtected = Boolean(
+    cachedValue(local, "zammadMergedFromTicketId")
+    || cachedValue(zammad, "mergedFromTicketId")
+    || (cachedValue(project, "closeReviewRequired") === true && zammadStateId !== 4)
+  );
   const pendingTodoExists = cachedValue(local, "zammadPendingTodoExists");
   const localTeamspaceProjects = cachedStringList(project, "teamspaceProjects");
   const zammadTeamspaceProjects = cachedStringList(zammad, "teamspaceProjects");
@@ -694,18 +734,18 @@ function changesFromExistingPreviewCache(item: ZammadSyncItem, fields: ZammadSyn
     addCachedChange(changes, "Organisation", cachedValue(local, "organizationId"), cachedValue(zammad, "organizationId"));
   }
 
-  if (fields.type) {
+  if (fields.type && !mergeProtected) {
     addCachedChange(changes, "Typ", localWorkType, zammadWorkType);
   }
 
-  if (fields.type && zammadWorkType === "support" && project) {
+  if (!mergeProtected && fields.type && zammadWorkType === "support" && project) {
     changes.push({ field: "Projekt/Teamspace-Daten", from: "vorhanden", to: "werden gelöscht" });
   }
 
-  const consultingProjectCanBeTouched = zammadWorkType === "consulting" && (fields.type || localWorkType === "consulting");
+  const consultingProjectCanBeTouched = !mergeProtected && zammadWorkType === "consulting" && (fields.type || localWorkType === "consulting");
 
   if (consultingProjectCanBeTouched) {
-    if (fields.type && !project) {
+    if (fields.type && localWorkType !== "consulting" && !project) {
       changes.push({ field: "Projekt", from: null, to: "wird angelegt" });
     }
 
@@ -722,7 +762,28 @@ function changesFromExistingPreviewCache(item: ZammadSyncItem, fields: ZammadSyn
     }
   }
 
-  return changes;
+  if (mergeProtected && project && cachedValue(project, "closeReviewRequired") === true && zammadStateId !== 4) {
+    if (mergeReviewMatchesCachedZammad(localTeamspaceProjectList, zammadTeamspaceProjectList)) {
+      changes.push({ field: "Merge-Prüfung", from: true, to: false });
+    } else {
+      if (localTeamspaceProjectList.length > 0 && zammadTeamspaceProjectList.length === 0) {
+        changes.push({
+          field: "Merge-Projektdaten",
+          from: normalizedTeamspaceProjectList(localTeamspaceProjectList),
+          to: "in Zammad fehlen; lokale Projektdaten bleiben erhalten und muessen dort nachgetragen werden"
+        });
+      } else if (cachedValueChanged("Teamspace-Projekte", localTeamspaceProjectList, zammadTeamspaceProjectList)) {
+        changes.push({
+          field: "Merge-Projektdaten",
+          from: normalizedTeamspaceProjectList(localTeamspaceProjectList),
+          to: normalizedTeamspaceProjectList(zammadTeamspaceProjectList)
+        });
+      }
+
+    }
+  }
+
+  return preserveExistingPreviewChanges(item, changes, fields);
 }
 
 function rebuildZammadSyncResultFromItems(mode: ZammadSyncResult["mode"], items: ZammadSyncItem[], checked = items.length): ZammadSyncResult {