server: infer archive collected_at from source events

internal/exporter/reanimator_converter_test.go

@@ -656,6 +656,43 @@ func TestConvertToReanimator_DeduplicatesAllSections(t *testing.T) {
 	}
 }
 
+func TestConvertToReanimator_StatusFallbackUsesCollectedAt(t *testing.T) {
+	collectedAt := time.Date(2026, 2, 10, 15, 30, 0, 0, time.UTC)
+	input := &models.AnalysisResult{
+		Filename:    "status-fallback.json",
+		CollectedAt: collectedAt,
+		Hardware: &models.HardwareConfig{
+			BoardInfo: models.BoardInfo{SerialNumber: "BOARD-001"},
+			Storage: []models.Storage{
+				{
+					Slot:         "U.2-1",
+					Model:        "PM9A3",
+					SerialNumber: "SSD-001",
+					Present:      true,
+					Status:       "OK",
+				},
+			},
+		},
+	}
+
+	out, err := ConvertToReanimator(input)
+	if err != nil {
+		t.Fatalf("ConvertToReanimator() failed: %v", err)
+	}
+	if len(out.Hardware.Storage) != 1 {
+		t.Fatalf("expected 1 storage entry, got %d", len(out.Hardware.Storage))
+	}
+
+	wantTs := collectedAt.UTC().Format(time.RFC3339)
+	got := out.Hardware.Storage[0]
+	if got.StatusCheckedAt != wantTs {
+		t.Fatalf("expected status_checked_at=%q, got %q", wantTs, got.StatusCheckedAt)
+	}
+	if got.StatusAtCollect == nil || got.StatusAtCollect.At != wantTs {
+		t.Fatalf("expected status_at_collection.at=%q, got %#v", wantTs, got.StatusAtCollect)
+	}
+}
+
 func TestConvertToReanimator_FirmwareExcludesDeviceBoundEntries(t *testing.T) {
 	input := &models.AnalysisResult{
 		Filename: "fw-filter-test.json",