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app/api/reorder/route.ts

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+import { NextResponse } from 'next/server';
+import db from '@/lib/db';
+
+export const dynamic = 'force-dynamic';
+
+// Body: { counters?: { id: number; order_index: number; group_id: number | null }[], groups?: { id: number; order_index: number }[] }
+export async function PUT(request: Request) {
+  const { counters, groups } = await request.json();
+
+  const updateCounters = db.prepare(
+    'UPDATE counters SET order_index = ?, group_id = ? WHERE id = ?'
+  );
+  const updateGroups = db.prepare(
+    'UPDATE groups SET order_index = ? WHERE id = ?'
+  );
+
+  const reorderAll = db.transaction(() => {
+    if (Array.isArray(counters)) {
+      for (const c of counters) {
+        updateCounters.run(c.order_index, c.group_id ?? null, c.id);
+      }
+    }
+    if (Array.isArray(groups)) {
+      for (const g of groups) {
+        updateGroups.run(g.order_index, g.id);
+      }
+    }
+  });
+
+  reorderAll();
+  return new NextResponse(null, { status: 204 });
+}