Add active users last 24h card to admin dashboard

src/app/admin/dashboard/page.tsx

@@ -3,6 +3,7 @@ import Link from "next/link";
 
 export default async function AdminDashboard() {
   const now = new Date();
+  const dayAgo = new Date(now.getTime() - 24 * 60 * 60 * 1000);
   const weekAgo = new Date(now.getTime() - 7 * 24 * 60 * 60 * 1000);
   const monthAgo = new Date(now.getTime() - 30 * 24 * 60 * 60 * 1000);
 
@@ -17,6 +18,7 @@ export default async function AdminDashboard() {
     homeworkTotal,
     progressTotal,
     balanceAggregate,
+    activeLast24h,
   ] = await Promise.all([
     prisma.user.count({ where: { role: "student" } }),
     prisma.user.count({ where: { role: "student", createdAt: { gte: monthAgo } } }),
@@ -32,6 +34,11 @@ export default async function AdminDashboard() {
     prisma.homeworkSubmission.count(),
     prisma.lessonProgress.count(),
     prisma.balanceTransaction.aggregate({ _sum: { amount: true } }),
+    prisma.session.findMany({
+      where: { createdAt: { gte: dayAgo } },
+      select: { userId: true },
+      distinct: ["userId"],
+    }).then((rows) => rows.length),
   ]);
 
   const totalBalance = Number(balanceAggregate._sum.amount ?? 0);
@@ -179,6 +186,14 @@ export default async function AdminDashboard() {
             </p>
             <p className="text-xs mt-0.5" style={{ color: "var(--muted-foreground)" }}>сумма по всем пользователям</p>
           </Link>
+
+          <div className="card-aubade p-5">
+            <p className="text-xs font-bold uppercase tracking-widest mb-3" style={{ color: "var(--muted-foreground)" }}>
+              Авторизации за 24 часа
+            </p>
+            <p className="text-3xl font-bold">{activeLast24h}</p>
+            <p className="text-xs mt-0.5" style={{ color: "var(--muted-foreground)" }}>уникальных пользователей</p>
+          </div>
         </div>
       </div>
     </div>