fix(dashboard): subtract cash prefill from income to fix Bilanz

500€ Kassen-Vorschuss was counted as income, inflating Einnahmen by 500€
and showing Bilanz -166€ instead of the correct -666€.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

gaehsnitz/suff.py

@@ -1,5 +1,6 @@
 import math
 from datetime import datetime, timedelta
+from decimal import Decimal
 from zoneinfo import ZoneInfo
 
 from django.conf import settings
@@ -747,9 +748,14 @@ DAY_LABELS = {1: "Donnerstag", 2: "Freitag", 3: "Samstag", 4: "Sonntag"}
 def dashboard_view(request):
     year = current_year()
 
+    CASH_PREFILL = Decimal("500.00")
+
     total_donations = Donation.objects.filter(date__year=year).aggregate(s=Sum("amount"))["s"] or 0
     total_costs = Payment.objects.filter(date__year=year).aggregate(s=Sum("amount"))["s"] or 0
-    user_payments_total = UserPayment.objects.filter(created_at__year=year).aggregate(s=Sum("amount"))["s"] or 0
+    cash_raw = UserPayment.objects.filter(created_at__year=year, method="cash").aggregate(s=Sum("amount"))["s"] or Decimal("0")
+    cash_net = cash_raw - CASH_PREFILL
+    non_cash = UserPayment.objects.filter(created_at__year=year).exclude(method="cash").aggregate(s=Sum("amount"))["s"] or Decimal("0")
+    user_payments_total = cash_net + non_cash  # real income, prefill excluded
 
     drinks = list(Drink.objects.filter(year=year).order_by("name"))
     drink_rows = [
@@ -958,6 +964,8 @@ def dashboard_view(request):
         "total_entry": total_entry,
         "method_split": method_split,
         "cash_total": cash_total,
+        "cash_prefill": CASH_PREFILL,
+        "cash_net": cash_net,
         "top_free_recipient": top_free_recipient,
         "free_total_count": free_total_count,
     }

gaehsnitz/templates/suff/dashboard.html

@@ -30,12 +30,16 @@
             <span class="hist-price">{{ total_donations|euro }}</span>
         </li>
         <li class="fin-row">
-            <span class="hist-what">Zahlungen (User-Tab)</span>
+            <span class="hist-what">Cashless (User-Tab)</span>
             <span class="hist-price">{{ user_payments_total|euro }}</span>
         </li>
         <li class="fin-row">
-            <span class="hist-what">Kasse (bar)</span>
-            <span class="hist-price">{{ cash_total|euro }}</span>
+            <span class="hist-what">Kasse (bar, nach Vorschuss)</span>
+            <span class="hist-price">{{ cash_net|euro }}</span>
+        </li>
+        <li class="fin-row">
+            <span class="hist-what">Kassen-Vorschuss</span>
+            <span class="hist-price">{{ cash_prefill|euro }}</span>
         </li>
         <li class="fin-row">
             <span class="hist-what">Einkaufspreis Getränke</span>