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app/api/counters/[id]/decrement/route.ts

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+import { NextResponse } from 'next/server';
+import db from '@/lib/db';
+
+export const dynamic = 'force-dynamic';
+
+type Params = { params: Promise<{ id: string }> };
+
+export async function POST(_req: Request, { params }: Params) {
+  const { id } = await params;
+  const tx = db.transaction(() => {
+    const row = db.prepare('UPDATE counters SET value = value - 1 WHERE id = ? AND value > 0 RETURNING *').get(Number(id));
+    if (row) db.prepare('INSERT INTO events (counter_id, delta, created_at) VALUES (?, -1, ?)').run(Number(id), Date.now());
+    return row;
+  });
+  const result = tx();
+  if (!result) return NextResponse.json({ error: 'Not found' }, { status: 404 });
+  return NextResponse.json(result);
+}