First commit - es tut schon mal ganz gut

app/api/ausgaben/stats/route.ts

@@ -0,0 +1,69 @@
+import { NextResponse } from 'next/server';
+import { getDbPool } from '@/lib/db';
+import { RowDataPacket } from 'mysql2';
+
+// GET /api/ausgaben/stats - Get monthly statistics
+export async function GET(request: Request) {
+  try {
+    const { searchParams } = new URL(request.url);
+    const month = searchParams.get('month');
+    const year = searchParams.get('year');
+
+    if (!month || !year) {
+      return NextResponse.json(
+        { success: false, error: 'Month and year are required' },
+        { status: 400 }
+      );
+    }
+
+    const pool = getDbPool();
+
+    // Get total ausgaben and breakdown by payment type
+    const query = `
+      SELECT 
+        SUM(CASE WHEN Wie IN ('EC-R', 'EC-B', 'bar-R', 'bar-B', 'Ueber') THEN Wieviel ELSE 0 END) as totalAusgaben,
+        SUM(CASE WHEN Wie = 'EC-R' THEN Wieviel ELSE 0 END) as ECR,
+        SUM(CASE WHEN Wie = 'EC-B' THEN Wieviel ELSE 0 END) as ECB,
+        SUM(CASE WHEN Wie = 'bar-R' THEN Wieviel ELSE 0 END) as barR,
+        SUM(CASE WHEN Wie = 'bar-B' THEN Wieviel ELSE 0 END) as barB,
+        SUM(CASE WHEN Wie = 'Einnahme' THEN Wieviel ELSE 0 END) as Einnahmen,
+        SUM(CASE WHEN Wie = 'Ueber' THEN Wieviel ELSE 0 END) as Ueberweisungen
+      FROM Ausgaben_Tag
+      WHERE YEAR(Datum) = ? AND MONTH(Datum) = ?
+    `;
+
+    const [rows] = await pool.query<RowDataPacket[]>(query, [year, month]);
+
+    const data = rows[0] || {
+      totalAusgaben: 0,
+      ECR: 0,
+      ECB: 0,
+      barR: 0,
+      barB: 0,
+      Einnahmen: 0,
+      Ueberweisungen: 0,
+    };
+
+    // Convert string values from MySQL to numbers
+    const parsedData = {
+      totalAusgaben: parseFloat(data.totalAusgaben) || 0,
+      ECR: parseFloat(data.ECR) || 0,
+      ECB: parseFloat(data.ECB) || 0,
+      barR: parseFloat(data.barR) || 0,
+      barB: parseFloat(data.barB) || 0,
+      Einnahmen: parseFloat(data.Einnahmen) || 0,
+      Ueberweisungen: parseFloat(data.Ueberweisungen) || 0,
+    };
+
+    return NextResponse.json({
+      success: true,
+      data: parsedData,
+    });
+  } catch (error) {
+    console.error('Database error:', error);
+    return NextResponse.json(
+      { success: false, error: 'Database error' },
+      { status: 500 }
+    );
+  }
+}