Initiale Version: Stromverbrauch-Web-App (strom-next)

Next.js-App zur Visualisierung des Stromverbrauchs aus InfluxDB
(Bucket strom, measurement vzlogger, Feld arbeit = kumulativer
Zaehlerstand in Wh).

- 4 Balken-Diagramme: 24h (stuendlich), Woche (stuendlich),
  31 Tage (taeglich), Jahr (pro Monat, immer 12 Monate)
- Verbrauch via difference des Zaehlerstands, zeitzonen-korrekt
- 24h liest Rohdaten (aktuell), 7d/31d/365d den stuendlichen
  Downsampling-Rollup (arbeit_hourly) -> sub-sekunde
- Gesamtverbrauch je Zeitraum unter dem Chart
- Design/Layout angelehnt an Werte-Log "Verlauf"

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

app/api/verbrauch/route.ts

@@ -0,0 +1,48 @@
+import { NextRequest, NextResponse } from 'next/server';
+import { resolveRange } from '@/lib/ranges';
+import { fetchVerbrauch } from '@/lib/influx';
+import { RangeKey } from '@/types/strom';
+
+const VALID_RANGES: RangeKey[] = ['24h', '7d', '31d', '365d'];
+
+// GET /api/verbrauch?range=24h&date=YYYY-MM-DD
+//                    ?range=7d&date=YYYY-MM-DD
+//                    ?range=31d&month=YYYY-MM
+//                    ?range=365d&year=YYYY
+export async function GET(request: NextRequest) {
+  const sp = request.nextUrl.searchParams;
+  const range = sp.get('range') as RangeKey | null;
+
+  if (!range || !VALID_RANGES.includes(range)) {
+    return NextResponse.json(
+      { success: false, error: `Ungueltiger range-Parameter. Erlaubt: ${VALID_RANGES.join(', ')}` },
+      { status: 400 }
+    );
+  }
+
+  try {
+    const resolved = resolveRange(range, {
+      date: sp.get('date'),
+      month: sp.get('month'),
+      year: sp.get('year'),
+    });
+    const data = await fetchVerbrauch(resolved);
+
+    return NextResponse.json(
+      { success: true, data },
+      {
+        headers: {
+          'Cache-Control': 'no-store, no-cache, must-revalidate',
+          'Pragma': 'no-cache',
+          'Expires': '0',
+        },
+      }
+    );
+  } catch (error) {
+    console.error('InfluxDB error:', error);
+    return NextResponse.json(
+      { success: false, error: 'Fehler beim Laden der Verbrauchsdaten.' },
+      { status: 500 }
+    );
+  }
+}