diff --git a/app/main.py b/app/main.py
index 394f8d0..349357a 100644
--- a/app/main.py
+++ b/app/main.py
@@ -421,9 +421,18 @@ def _row_to_detail(row):
         field = cell.get("field", "")
         if field:
             rating_raw = cell.get("rating", 0)
-            # DB speichert rating als 1-5 Skala (1=−−,2=−,3=○,4=+,5=++),
-            # matrix_mini erwartet -2..+2. Mapping: DB-3=0, DB-4=+1, DB-5=+2, DB-2=−1, DB-1=−2
-            rating_normalized = int(rating_raw) - 3
+            # DB speichert rating als −5..+5 Skala (siehe models.py:MatrixEntry).
+            # matrix_mini erwartet die gleiche Skala — kein Shift.
+            # (Frueher 1..5 → -2..+2 mit `- 3`; DB-Migration auf -5..+5 ist
+            # laengst durch, der Shift war ein Bug der ratings={3,4,5} alle
+            # auf m-p mapped → "+/++ gleichfarbig"-Befund aus #177.)
+            try:
+                rating_normalized = int(rating_raw)
+            except (TypeError, ValueError):
+                rating_normalized = 0
+            # Defensiv: wenn rating ausserhalb -5..+5 liegt, clampen.
+            if rating_normalized < -5: rating_normalized = -5
+            if rating_normalized > 5:  rating_normalized = 5
             symbol = cell.get("symbol", "○")
             matrix_dict[field] = {"rating": rating_normalized, "symbol": symbol}