Rework real estate model: purchase price + mortgage + amortization only, no appreciation; amortization counts against savings quota; sale price/tax entered at transition time with correct mortgage payoff; carry over income/expenses to new phases

src/app/api/plans/[planId]/phases/route.ts

@@ -31,9 +31,12 @@ export async function POST(
   const lastPhase = await prisma.phase.findFirst({
     where: { planId },
     orderBy: { sequenceNumber: "desc" },
+    include: { incomeEntries: true, expenseEntries: true },
   });
   const nextSequence = (lastPhase?.sequenceNumber ?? 0) + 1;
 
+  // Einkommen und Ausgaben werden 1:1 aus der letzten Phase uebernommen (manuell
+  // anpassbar), damit man sie nicht bei jeder neuen Phase erneut eintippen muss.
   const phase = await prisma.phase.create({
     data: {
       planId,
@@ -41,7 +44,21 @@ export async function POST(
       name: parsed.data.name,
       durationYears: parsed.data.durationYears,
       inflationRate: parsed.data.inflationRate ?? null,
-      incomeMode: parsed.data.incomeMode,
+      incomeMode: lastPhase?.incomeMode ?? parsed.data.incomeMode,
+      incomeEntries: lastPhase
+        ? {
+            create: lastPhase.incomeEntries.map((e) => ({
+              personId: e.personId,
+              label: e.label,
+              amount: e.amount,
+            })),
+          }
+        : undefined,
+      expenseEntries: lastPhase
+        ? {
+            create: lastPhase.expenseEntries.map((e) => ({ label: e.label, amount: e.amount })),
+          }
+        : undefined,
     },
     include: phaseInclude,
   });