feat: enhance summary pivot specifications to include column fields

internal/report/snapshots.go

@@ -918,29 +918,31 @@ func addTotalsChartSheet(logger *slog.Logger, database db.Database, ctx context.
 }
 
 type summaryPivotSpec struct {
-	Metric      string
-	Title       string
-	TitleCell   string
-	PivotName   string
-	PivotRange  string
-	RowFields   []string
-	DataField   string
-	DataName    string
-	DataSummary string
+	Metric       string
+	Title        string
+	TitleCell    string
+	PivotName    string
+	PivotRange   string
+	RowFields    []string
+	ColumnFields []string
+	DataField    string
+	DataName     string
+	DataSummary  string
 }
 
 func defaultSummaryPivotSpecs(summarySheet string) []summaryPivotSpec {
 	return []summaryPivotSpec{
 		{
-			Metric:      "avg_vcpu",
-			Title:       "Sum of Avg vCPUs",
-			TitleCell:   "A1",
-			PivotName:   "PivotAvgVcpu",
-			PivotRange:  fmt.Sprintf("%s!A3:H40", summarySheet),
-			RowFields:   []string{"Datacenter", "ResourcePool"},
-			DataField:   "AvgVcpuCount",
-			DataName:    "Sum of Avg vCPUs",
-			DataSummary: "Sum",
+			Metric:       "avg_vcpu",
+			Title:        "Sum of Avg vCPUs",
+			TitleCell:    "A1",
+			PivotName:    "PivotAvgVcpu",
+			PivotRange:   fmt.Sprintf("%s!A3:H40", summarySheet),
+			RowFields:    []string{"Datacenter"},
+			ColumnFields: []string{"ResourcePool"},
+			DataField:    "AvgVcpuCount",
+			DataName:     "Sum of Avg vCPUs",
+			DataSummary:  "Sum",
 		},
 		{
 			Metric:      "avg_ram",
@@ -1117,6 +1119,19 @@ func addSummaryPivotSheet(logger *slog.Logger, xlsx *excelize.File, dataSheet st
 		if missingField {
 			continue
 		}
+		columns := make([]excelize.PivotTableField, 0, len(spec.ColumnFields))
+		for _, columnField := range spec.ColumnFields {
+			resolved, ok := resolveField(columnField)
+			if !ok {
+				logger.Warn("summary pivot skipped: missing column field", "table", tableName, "pivot", spec.PivotName, "field", columnField)
+				missingField = true
+				break
+			}
+			columns = append(columns, excelize.PivotTableField{Data: resolved})
+		}
+		if missingField {
+			continue
+		}
 		dataField, ok := resolveField(spec.DataField)
 		if !ok {
 			logger.Warn("summary pivot skipped: missing data field", "table", tableName, "pivot", spec.PivotName, "field", spec.DataField)
@@ -1128,6 +1143,7 @@ func addSummaryPivotSheet(logger *slog.Logger, xlsx *excelize.File, dataSheet st
 			DataRange:           dataRange,
 			PivotTableRange:     spec.PivotRange,
 			Rows:                rows,
+			Columns:             columns,
 			Data:                []excelize.PivotTableField{{Data: dataField, Name: spec.DataName, Subtotal: spec.DataSummary}},
 			RowGrandTotals:      true,
 			ColGrandTotals:      true,