feat: add logging functionality for counter updates for incrementing on different dates (for stats)

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

@@ -0,0 +1,39 @@
+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(request: Request, { params }: Params) {
+  const { id } = await params;
+  const { date, delta } = await request.json();
+
+  if (!date || typeof date !== 'string' || !/^\d{4}-\d{2}-\d{2}$/.test(date)) {
+    return NextResponse.json({ error: 'Invalid date' }, { status: 400 });
+  }
+  if (delta !== 1 && delta !== -1) {
+    return NextResponse.json({ error: 'Delta must be 1 or -1' }, { status: 400 });
+  }
+
+  const existing = db.prepare('SELECT * FROM counters WHERE id = ? AND archived_at IS NULL').get(Number(id)) as Record<string, unknown> | undefined;
+  if (!existing) return NextResponse.json({ error: 'Not found' }, { status: 404 });
+
+  // Store at noon local server time so SQLite's 'localtime' grouping matches the picked date
+  const createdAt = new Date(`${date}T12:00:00`).getTime();
+  if (isNaN(createdAt)) return NextResponse.json({ error: 'Invalid date' }, { status: 400 });
+
+  const result = db.transaction(() => {
+    const updated = db.prepare(
+      delta === 1
+        ? 'UPDATE counters SET value = value + 1 WHERE id = ? RETURNING *'
+        : 'UPDATE counters SET value = value - 1 WHERE id = ? AND value > 0 RETURNING *'
+    ).get(Number(id)) as Record<string, unknown> | undefined;
+    if (!updated) return null;
+    db.prepare('INSERT INTO events (counter_id, delta, created_at) VALUES (?, ?, ?)').run(Number(id), delta, createdAt);
+    return updated;
+  })();
+
+  if (!result) return NextResponse.json({ error: 'Counter cannot go below 0' }, { status: 400 });
+  return NextResponse.json(result);
+}