Phase5: Automate bill creation

src/app/api/cron/send-reminders/route.ts

@@ -0,0 +1,33 @@
+import { NextResponse } from "next/server";
+import { runReminderSweep, verifyCronBearer } from "@/lib/cron";
+import { safeError } from "@/lib/errors";
+
+/**
+ * POST /api/cron/send-reminders
+ *
+ * Machine entry point for the daily reminder sweep. Same auth
+ * (bearer token in CRON_BEARER_TOKEN) and the same response
+ * contract as /api/cron/issue-monthly.
+ *
+ * Schedule: 09:00 Europe/Zurich daily. Picks invoices that are
+ * past their due date and haven't received the corresponding
+ * reminder level yet; sends one email per invoice per run.
+ */
+export const dynamic = "force-dynamic";
+
+export async function POST(request: Request) {
+  if (!verifyCronBearer(request.headers.get("authorization"))) {
+    return NextResponse.json({ error: "Unauthorized" }, { status: 401 });
+  }
+  try {
+    const { runId, summary } = await runReminderSweep({
+      triggeredBy: "cron",
+    });
+    return NextResponse.json({ runId, ...summary });
+  } catch (e) {
+    return NextResponse.json(
+      { error: safeError(e, "Reminder sweep failed.") },
+      { status: 500 }
+    );
+  }
+}