Datenschutz vollmacht fixed, two time counter added

backend/src/controllers/contract.controller.ts

@@ -244,6 +244,79 @@ export async function getCockpit(req: AuthRequest, res: Response): Promise<void>
   }
 }
 
+// ==================== FOLGEZÄHLER ====================
+
+export async function addSuccessorMeter(req: AuthRequest, res: Response): Promise<void> {
+  try {
+    const contractId = parseInt(req.params.id);
+    const { meterId, installedAt, finalReadingPrevious } = req.body;
+
+    const contract = await prisma.contract.findUnique({
+      where: { id: contractId },
+      include: { energyDetails: { include: { contractMeters: { orderBy: { position: 'asc' } } } } },
+    });
+
+    if (!contract?.energyDetails) {
+      res.status(404).json({ success: false, error: 'Energievertrag nicht gefunden' } as ApiResponse);
+      return;
+    }
+
+    const ecdId = contract.energyDetails.id;
+    const existingMeters = contract.energyDetails.contractMeters;
+    const nextPosition = existingMeters.length > 0
+      ? Math.max(...existingMeters.map(m => m.position)) + 1
+      : 0;
+
+    // Vorherigen Zähler als gewechselt markieren
+    if (existingMeters.length > 0 && finalReadingPrevious !== undefined) {
+      const prevMeter = existingMeters[existingMeters.length - 1];
+      await prisma.contractMeter.update({
+        where: { id: prevMeter.id },
+        data: {
+          removedAt: installedAt ? new Date(installedAt) : new Date(),
+          finalReading: parseFloat(finalReadingPrevious),
+        },
+      });
+    }
+
+    const contractMeter = await prisma.contractMeter.create({
+      data: {
+        energyContractDetailsId: ecdId,
+        meterId: parseInt(meterId),
+        position: nextPosition,
+        installedAt: installedAt ? new Date(installedAt) : new Date(),
+      },
+      include: { meter: { include: { readings: true } } },
+    });
+
+    // Aktuellen Zähler am Vertrag aktualisieren
+    await prisma.energyContractDetails.update({
+      where: { id: ecdId },
+      data: { meterId: parseInt(meterId) },
+    });
+
+    res.json({ success: true, data: contractMeter } as ApiResponse);
+  } catch (error) {
+    res.status(400).json({
+      success: false,
+      error: error instanceof Error ? error.message : 'Fehler beim Hinzufügen des Folgezählers',
+    } as ApiResponse);
+  }
+}
+
+export async function removeContractMeter(req: AuthRequest, res: Response): Promise<void> {
+  try {
+    const contractMeterId = parseInt(req.params.contractMeterId);
+    await prisma.contractMeter.delete({ where: { id: contractMeterId } });
+    res.json({ success: true, data: null } as ApiResponse);
+  } catch (error) {
+    res.status(400).json({
+      success: false,
+      error: error instanceof Error ? error.message : 'Fehler beim Entfernen',
+    } as ApiResponse);
+  }
+}
+
 // ==================== SNOOZE (VERTRAG ZURÜCKSTELLEN) ====================
 
 export async function snoozeContract(req: Request, res: Response): Promise<void> {