feat: Implement message check-in and status management, introduce flexible interval units, and add decryption routes for messages and attachments.

src/app/api/messages/[messageId]/status/route.ts

@@ -0,0 +1,36 @@
+import { NextResponse } from 'next/server';
+import { getServerSession } from 'next-auth';
+import { authOptions } from '@/lib/auth/options';
+import { prisma } from '@/lib/prisma';
+
+export async function POST(
+  req: Request,
+  { params }: { params: Promise<{ messageId: string }> }
+) {
+  const session = await getServerSession(authOptions);
+  if (!session?.user?.id) {
+    return NextResponse.json({ error: 'Unauthorized' }, { status: 401 });
+  }
+
+  const { messageId } = await params;
+  const { status } = await req.json();
+
+  if (!['DRAFT', 'ACTIVE'].includes(status)) {
+    return NextResponse.json({ error: 'Invalid status' }, { status: 400 });
+  }
+
+  const message = await prisma.message.findUnique({
+    where: { id: messageId, userId: session.user.id },
+  });
+
+  if (!message) {
+    return NextResponse.json({ error: 'Not found' }, { status: 404 });
+  }
+
+  const updated = await prisma.message.update({
+    where: { id: messageId },
+    data: { status, lastPing: new Date() },
+  });
+
+  return NextResponse.json({ success: true, status: updated.status });
+}