Fix false stale Fleet reports caused by clock skew

tests/unit/telemetry.test.ts

@@ -13,6 +13,31 @@ afterEach(async () => fixture.cleanup());
 
 const payload = gameEvent('round_change', 17);
 
+it('timestamps initial telemetry and subsequent status and telemetry events with the server clock', async () => {
+    const { GET } = await import('../../src/routes/api/events/servers/+server.js');
+    const { emit } = await import('../../src/lib/server/pipeline/bus.js');
+    const startedAt = Date.parse('2026-09-19T12:00:00Z');
+    const clock = vi.spyOn(Date, 'now').mockReturnValue(startedAt);
+    const reader = (await GET()).body!.getReader();
+    const nextEvent = async () => {
+        const frame = new TextDecoder().decode((await reader.read()).value);
+        return JSON.parse(frame.split('\n').find(line => line.startsWith('data: '))!.slice(6));
+    };
+    try {
+        await reader.read(); // Initial SSE comment.
+        expect(await nextEvent()).toMatchObject({ snapshot: true, entries: [], serverNow: startedAt });
+        clock.mockReturnValue(startedAt + 30_000);
+        emit({ type: 'server-status', entries: [] });
+        expect(await nextEvent()).toEqual({ type: 'server-status', entries: [], serverNow: startedAt + 30_000 });
+        clock.mockReturnValue(startedAt + 31_000);
+        emit({ type: 'server-telemetry', entries: [] });
+        expect(await nextEvent()).toEqual({ type: 'server-telemetry', entries: [], serverNow: startedAt + 31_000 });
+    } finally {
+        await reader.cancel();
+        clock.mockRestore();
+    }
+});
+
 it('persists full player stats, broadcasts updates, and leaves RCON safety data untouched', async () => {
     const { subscribe } = await import('../../src/lib/server/pipeline/bus.js');
     const listener = vi.fn();