diff --git a/backend/app/api/reports.py b/backend/app/api/reports.py
index b1abb9e..523a06b 100644
--- a/backend/app/api/reports.py
+++ b/backend/app/api/reports.py
@@ -119,17 +119,28 @@ def generate_report(
         with open(filepath, "wb") as f:
             f.write(xlsx_bytes)
 
-        # Save report metadata to DB
-        report = WeeklyReport(
-            jahr=jahr,
-            kw=kw,
-            report_date=date.today(),
-            report_data=report_data,
-            generated_by=user.id,
+        # Upsert report metadata (replace if same jahr/kw exists)
+        report = (
+            db.query(WeeklyReport)
+            .filter(WeeklyReport.jahr == jahr, WeeklyReport.kw == kw)
+            .first()
         )
-        report.report_file_path = filepath
+        if report:
+            report.report_date = date.today()
+            report.report_data = report_data
+            report.report_file_path = filepath
+            report.generated_by = user.id
+        else:
+            report = WeeklyReport(
+                jahr=jahr,
+                kw=kw,
+                report_date=date.today(),
+                report_data=report_data,
+                generated_by=user.id,
+            )
+            report.report_file_path = filepath
+            db.add(report)
 
-        db.add(report)
         db.commit()
         db.refresh(report)