Rework core model: financial elements as plan-wide entities across phases; derived phase types (Erwerb/Pension/Misch) with retirement-capped durations and per-plan retirement age; AHV (gap years + couple ceiling), PK payout/annuity, 3a, real estate, other assets/debts; horizontal timeline with retirement markers; phase x element matrix with detail panel; savings/consumption quota + available-capital key figures with red status

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

@@ -0,0 +1,69 @@
+import { NextRequest, NextResponse } from "next/server";
+import { z } from "zod";
+import { prisma } from "@/lib/db";
+import { getOwnedPlan } from "@/lib/queries";
+import { getCurrentUserId } from "@/lib/session";
+import { PERSON_ONLY_CATEGORIES } from "@/lib/elements";
+
+const createSchema = z.object({
+  category: z.enum([
+    "INCOME",
+    "EXPENSE",
+    "AHV",
+    "PENSION_FUND",
+    "PILLAR_3A",
+    "REAL_ESTATE",
+    "OTHER_ASSET",
+    "OTHER_DEBT",
+  ]),
+  name: z.string().min(1).max(120),
+  ownerRole: z.enum(["PERSON_A", "PERSON_B", "HOUSEHOLD"]).nullable().optional(),
+});
+
+// Legt ein neues finanzielles Element (plan-weit) an. Personen-Pflicht je Kategorie.
+export async function POST(
+  request: NextRequest,
+  { params }: { params: Promise<{ planId: string }> }
+) {
+  const userId = await getCurrentUserId();
+  if (!userId) return NextResponse.json({ error: "Nicht authentifiziert." }, { status: 401 });
+  const { planId } = await params;
+
+  const plan = await getOwnedPlan(planId, userId);
+  if (!plan) return NextResponse.json({ error: "Plan nicht gefunden." }, { status: 404 });
+
+  const body = await request.json();
+  const parsed = createSchema.safeParse(body);
+  if (!parsed.success) return NextResponse.json({ error: "Ungueltige Eingabe." }, { status: 400 });
+
+  const { category, name } = parsed.data;
+  let ownerRole = parsed.data.ownerRole ?? null;
+
+  if (PERSON_ONLY_CATEGORIES.includes(category)) {
+    if (ownerRole !== "PERSON_A" && ownerRole !== "PERSON_B") {
+      return NextResponse.json(
+        { error: "Diese Kategorie muss einer Person zugeordnet werden." },
+        { status: 400 }
+      );
+    }
+  } else if (ownerRole == null) {
+    ownerRole = "HOUSEHOLD";
+  }
+
+  const maxOrder = await prisma.financialElement.aggregate({
+    where: { planId: plan.id },
+    _max: { orderIndex: true },
+  });
+
+  const element = await prisma.financialElement.create({
+    data: {
+      planId: plan.id,
+      category,
+      name,
+      ownerRole,
+      orderIndex: (maxOrder._max.orderIndex ?? 0) + 1,
+    },
+  });
+
+  return NextResponse.json({ element: { id: element.id } }, { status: 201 });
+}