Add PostgreSQL checkpoint functionality and update related database operations

internal/report/snapshots_pivot_test.go

@@ -0,0 +1,62 @@
+package report
+
+import (
+	"io"
+	"log/slog"
+	"strings"
+	"testing"
+
+	"github.com/xuri/excelize/v2"
+)
+
+func TestAddSummaryPivotSheetCreatesPivotTables(t *testing.T) {
+	xlsx := excelize.NewFile()
+	const dataSheet = "Snapshot Report"
+	if err := xlsx.SetSheetName("Sheet1", dataSheet); err != nil {
+		t.Fatalf("SetSheetName failed: %v", err)
+	}
+
+	headers := []string{"Name", "Datacenter", "ResourcePool", "AvgVcpuCount", "AvgRamGB", "AvgIsPresent"}
+	if err := xlsx.SetSheetRow(dataSheet, "A1", &headers); err != nil {
+		t.Fatalf("SetSheetRow header failed: %v", err)
+	}
+
+	row1 := []interface{}{"vm-1", "dc-1", "pool-1", 4.0, 16.0, 1.0}
+	if err := xlsx.SetSheetRow(dataSheet, "A2", &row1); err != nil {
+		t.Fatalf("SetSheetRow data failed: %v", err)
+	}
+
+	logger := slog.New(slog.NewTextHandler(io.Discard, nil))
+	addSummaryPivotSheet(logger, xlsx, dataSheet, headers, 1, "inventory_daily_summary_20260215")
+
+	pivots, err := xlsx.GetPivotTables("Summary")
+	if err != nil {
+		t.Fatalf("GetPivotTables failed: %v", err)
+	}
+	if len(pivots) != 4 {
+		t.Fatalf("expected 4 pivot tables, got %d", len(pivots))
+	}
+
+	expectedNames := map[string]bool{
+		"PivotAvgVcpu":         false,
+		"PivotAvgRam":          false,
+		"PivotProratedVmCount": false,
+		"PivotVmNameCount":     false,
+	}
+	for _, pivot := range pivots {
+		if _, ok := expectedNames[pivot.Name]; ok {
+			expectedNames[pivot.Name] = true
+		}
+		if strings.Contains(pivot.DataRange, "'") {
+			t.Fatalf("pivot %q has quoted DataRange %q; expected unquoted sheet reference", pivot.Name, pivot.DataRange)
+		}
+		if strings.Contains(pivot.PivotTableRange, "'") {
+			t.Fatalf("pivot %q has quoted PivotTableRange %q; expected unquoted sheet reference", pivot.Name, pivot.PivotTableRange)
+		}
+	}
+	for name, seen := range expectedNames {
+		if !seen {
+			t.Fatalf("missing expected pivot table %q", name)
+		}
+	}
+}