fix(dashboard,auth): today-window on @db.Date + query-cache cleared across logins

Two dashboard bugs reported after clock-in:

1. 'Dochazka dnes' / 'Pritomni dnes' showed everyone absent even after
   refresh: attendance.shift_date is @db.Date and Prisma truncates filter
   Dates to their UTC date part, so the local-midnight boundaries
   (new Date(y,m,d) = 22:00/23:00Z of the previous day) queried
   [yesterday, today) and matched zero of today's punches. Boundaries are
   now UTC-midnight instants of the local (Prague) calendar day.
   Reproduced empirically against real rows; route-level regression test
   added (dashboard.test.ts).

2. After logout + login as a different user, cached dashboards/buttons from
   the previous user were served: query keys are user-agnostic and the
   React Query cache outlives the session. logout(), login() and the 2FA
   verify path now clear the whole cache.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

src/__tests__/dashboard.test.ts

@@ -0,0 +1,100 @@
+import { describe, it, expect, beforeAll, afterAll } from "vitest";
+import Fastify from "fastify";
+import jwt from "jsonwebtoken";
+import prisma from "../config/database";
+import { config } from "../config/env";
+import dashboardRoutes from "../routes/admin/dashboard";
+
+// ---------------------------------------------------------------------------
+// Regression test for the "Docházka dnes" / "Přítomní dnes" dashboard window.
+//
+// attendance.shift_date is @db.Date and Prisma truncates a filter Date to its
+// UTC date part. The dashboard used local-midnight boundaries
+// (new Date(y, m, d) = 22:00/23:00 UTC of the PREVIOUS day under
+// TZ=Europe/Prague), which truncated to [yesterday, today) — today's punches
+// matched zero rows and everyone showed as absent. The boundaries must be
+// UTC-midnight instants of the LOCAL calendar day.
+//
+// Unlike the other suites this one has to use the REAL current date (the
+// route computes "today" internally), so fixtures are tracked by id and
+// deleted in afterAll.
+// ---------------------------------------------------------------------------
+
+let app: Awaited<ReturnType<typeof buildApp>>;
+let adminUserId: number;
+let adminToken: string;
+const createdIds: number[] = [];
+
+async function buildApp() {
+  const a = Fastify({ logger: false });
+  await a.register(dashboardRoutes, { prefix: "/api/admin/dashboard" });
+  return a;
+}
+
+beforeAll(async () => {
+  app = await buildApp();
+
+  const admin = await prisma.users.findFirst({
+    where: { roles: { name: "admin" } },
+    include: { roles: true },
+  });
+  if (!admin) throw new Error("Test setup: admin user not found");
+  adminUserId = admin.id;
+  adminToken = jwt.sign(
+    { sub: admin.id, username: admin.username, role: "admin" },
+    config.jwt.secret,
+    { expiresIn: "15m" },
+  );
+});
+
+afterAll(async () => {
+  if (createdIds.length) {
+    await prisma.attendance.deleteMany({ where: { id: { in: createdIds } } });
+  }
+  if (app) await app.close();
+});
+
+describe("GET /api/admin/dashboard — today's attendance window", () => {
+  it("counts a punched-in user as present (local-noon @db.Date row)", async () => {
+    const now = new Date();
+    // The attendance regime stores shift_date at LOCAL NOON (so the UTC date
+    // part equals the Prague calendar date) — same as punchAction does.
+    const row = await prisma.attendance.create({
+      data: {
+        user_id: adminUserId,
+        shift_date: new Date(
+          now.getFullYear(),
+          now.getMonth(),
+          now.getDate(),
+          12,
+          0,
+          0,
+        ),
+        leave_type: "work",
+        arrival_time: now,
+        departure_time: null,
+        notes: "dashboard_window_test",
+      },
+    });
+    createdIds.push(row.id);
+
+    const res = await app.inject({
+      method: "GET",
+      url: "/api/admin/dashboard",
+      headers: { Authorization: `Bearer ${adminToken}` },
+    });
+
+    expect(res.statusCode).toBe(200);
+    const body = res.json();
+    expect(body.success).toBe(true);
+
+    const attendance = body.data.attendance;
+    expect(attendance).toBeTruthy();
+    const me = attendance.users.find(
+      (u: { user_id: number }) => u.user_id === adminUserId,
+    );
+    expect(me).toBeTruthy();
+    expect(me.status).toBe("in");
+    expect(attendance.present_today).toBeGreaterThanOrEqual(1);
+  });
+});

src/admin/context/AuthContext.tsx

@@ -9,6 +9,7 @@ import {
   type ReactNode,
 } from "react";
 import { setSessionExpired, setTokenGetter, setRefreshFn } from "../utils/api";
+import { queryClient } from "../lib/queryClient";
 
 const API_BASE = "/api/admin";
 
@@ -232,6 +233,10 @@ export function AuthProvider({ children }: { children: ReactNode }) {
               remember,
             };
           }
+          // Query keys are user-agnostic (["dashboard"], ["attendance"], …),
+          // so anything cached from a previously logged-in user would be
+          // served to this one — drop the whole cache on every login.
+          queryClient.clear();
           setAccessTokenFn(data.data.access_token, data.data.expires_in);
           setUser(mapUser(data.data.user));
           cachedUserRef.current = mapUser(data.data.user);
@@ -288,6 +293,9 @@ export function AuthProvider({ children }: { children: ReactNode }) {
         );
         const data = await response.json();
         if (data.success) {
+          // Same reason as in login(): the cache may hold the previous
+          // user's data under user-agnostic keys.
+          queryClient.clear();
           setAccessTokenFn(data.data.access_token, data.data.expires_in);
           setUser(mapUser(data.data.user));
           cachedUserRef.current = mapUser(data.data.user);
@@ -327,6 +335,10 @@ export function AuthProvider({ children }: { children: ReactNode }) {
         clearTimeout(refreshTimeoutRef.current);
         refreshTimeoutRef.current = null;
       }
+      // The React Query cache outlives the session — without this, the next
+      // user to log in on this browser sees the previous user's cached
+      // dashboards/lists until each query refetches.
+      queryClient.clear();
     }
   }, [getAccessTokenFn]);
 

src/routes/admin/dashboard.ts

@@ -11,15 +11,16 @@ export default async function dashboardRoutes(
 ): Promise<void> {
   fastify.get("/", { preHandler: requireAuth }, async (request, reply) => {
     const now = new Date();
+    // shift_date is @db.Date: Prisma truncates a filter Date to its UTC date
+    // part, so these boundaries MUST be UTC-midnight instants of the LOCAL
+    // (Prague) calendar day. A local-midnight Date (new Date(y, m, d)) is
+    // 22:00/23:00 UTC of the PREVIOUS day and silently shifts the window to
+    // [yesterday, today) — the "Docházka dnes" card then matches zero rows.
     const todayStart = new Date(
-      now.getFullYear(),
-      now.getMonth(),
-      now.getDate(),
+      Date.UTC(now.getFullYear(), now.getMonth(), now.getDate()),
     );
     const todayEnd = new Date(
-      now.getFullYear(),
-      now.getMonth(),
-      now.getDate() + 1,
+      Date.UTC(now.getFullYear(), now.getMonth(), now.getDate() + 1),
     );
     const monthStart = new Date(now.getFullYear(), now.getMonth(), 1);
     const monthEnd = new Date(now.getFullYear(), now.getMonth() + 1, 1);