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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);
+}

app/api/counters/[id]/history/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 GET(_req: Request, { params }: Params) {
+  const { id } = await params;
+  const counter = db.prepare('SELECT * FROM counters WHERE id = ?').get(Number(id));
+  if (!counter) return NextResponse.json({ error: 'Not found' }, { status: 404 });
+
+  const cutoff = Date.now() - 365 * 24 * 60 * 60 * 1000;
+
+  const dailyActivity = db.prepare(`
+    SELECT
+      date(created_at / 1000, 'unixepoch', 'localtime') AS date,
+      SUM(delta) AS value
+    FROM events
+    WHERE counter_id = ? AND created_at >= ?
+    GROUP BY date
+    HAVING SUM(delta) > 0
+    ORDER BY date ASC
+  `).all(Number(id), cutoff);
+
+  const allTimeTotal = (db.prepare(
+    'SELECT COALESCE(SUM(delta), 0) AS total FROM events WHERE counter_id = ?'
+  ).get(Number(id)) as { total: number }).total;
+
+  return NextResponse.json({ counter, dailyActivity, allTimeTotal });
+}

app/api/counters/[id]/increment/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 = ? 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);
+}

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

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+import { NextResponse } from 'next/server';
+import fs from 'fs';
+import path from 'path';
+import db, { UPLOADS_DIR } from '@/lib/db';
+
+export const dynamic = 'force-dynamic';
+
+type Params = { params: Promise<{ id: string }> };
+
+export async function GET(_req: Request, { params }: Params) {
+  const { id } = await params;
+  const counter = db.prepare('SELECT * FROM counters WHERE id = ?').get(Number(id));
+  if (!counter) return NextResponse.json({ error: 'Not found' }, { status: 404 });
+  return NextResponse.json(counter);
+}
+
+export async function PUT(request: Request, { params }: Params) {
+  const { id } = await params;
+  const body = await request.json();
+  const existing = db.prepare('SELECT * FROM counters WHERE id = ?').get(Number(id)) as Record<string, unknown> | undefined;
+  if (!existing) return NextResponse.json({ error: 'Not found' }, { status: 404 });
+
+  const name = body.name?.trim() ?? existing.name;
+  const value = body.value !== undefined ? body.value : existing.value;
+  const group_id = body.group_id !== undefined ? body.group_id : existing.group_id;
+  const image_path = body.image_path !== undefined ? body.image_path : existing.image_path;
+
+  db.prepare(
+    'UPDATE counters SET name = ?, value = ?, group_id = ?, image_path = ? WHERE id = ?'
+  ).run(name, value, group_id, image_path, Number(id));
+
+  const updated = db.prepare('SELECT * FROM counters WHERE id = ?').get(Number(id));
+  return NextResponse.json(updated);
+}
+
+export async function DELETE(_req: Request, { params }: Params) {
+  const { id } = await params;
+  const existing = db.prepare('SELECT * FROM counters WHERE id = ?').get(Number(id)) as Record<string, unknown> | undefined;
+  if (!existing) return NextResponse.json({ error: 'Not found' }, { status: 404 });
+
+  // Remove associated image if present
+  if (existing.image_path) {
+    const imgFile = path.join(UPLOADS_DIR, path.basename(existing.image_path as string));
+    try { fs.unlinkSync(imgFile); } catch { /* ignore missing file */ }
+  }
+
+  db.prepare('DELETE FROM counters WHERE id = ?').run(Number(id));
+  return new NextResponse(null, { status: 204 });
+}