Use global ticket detail entrypoint

backend/src/index.ts

@@ -2758,6 +2758,21 @@ app.post("/api/sessions", requireUser, async (req, res) => {
     throw badRequest("endedAt must be after startedAt");
   }
 
+  const monthClosureResult = await query<{ closed_at: string }>(
+    `
+      SELECT closed_at
+      FROM month_closures
+      WHERE month = date_trunc('month', $1::timestamptz AT TIME ZONE 'Europe/Berlin')::date
+        AND user_id = $2;
+    `,
+    [startedAt.toISOString(), user.id]
+  );
+
+  if (monthClosureResult.rows.length > 0) {
+    res.status(409).json({ error: "Monat ist abgeschlossen" });
+    return;
+  }
+
   const roundedMinutes = Math.max(1, Math.round(durationSeconds / 60));
   const created = await withTransaction(async (client) => {
     const existingTicketResult = await client.query<{ id: string; organization_id: string | null; customer_name: string | null; work_type: string | null }>(
@@ -3035,6 +3050,21 @@ app.patch("/api/tickets/:ticketId/day-billings/:day", requireUser, async (req, r
   const billedMinutes = parseOptionalBilledMinutes(req.body.billedMinutes);
   const userId = currentUser(req).id;
 
+  const monthClosureResult = await query<{ closed_at: string }>(
+    `
+      SELECT closed_at
+      FROM month_closures
+      WHERE month = date_trunc('month', $1::date)::date
+        AND user_id = $2;
+    `,
+    [day.start, userId]
+  );
+
+  if (monthClosureResult.rows.length > 0) {
+    res.status(409).json({ error: "Monat ist abgeschlossen" });
+    return;
+  }
+
   const sessionResult = await query<{ id: string }>(
     `
       SELECT id