improve aggregations

internal/tasks/inventorySnapshots.go

@@ -370,6 +370,16 @@ func filterSnapshotsWithRows(ctx context.Context, dbConn *sqlx.DB, snapshots []r
 	return filtered
 }
 
+func filterRecordsInRange(records []report.SnapshotRecord, start, end time.Time) []report.SnapshotRecord {
+	filtered := records[:0]
+	for _, r := range records {
+		if !r.SnapshotTime.Before(start) && r.SnapshotTime.Before(end) {
+			filtered = append(filtered, r)
+		}
+	}
+	return filtered
+}
+
 type columnDef struct {
 	Name string
 	Type string
@@ -437,18 +447,17 @@ func normalizeResourcePool(value string) string {
 	if trimmed == "" {
 		return ""
 	}
-	switch {
-	case strings.EqualFold(trimmed, "tin"):
-		return "Tin"
-	case strings.EqualFold(trimmed, "bronze"):
-		return "Bronze"
-	case strings.EqualFold(trimmed, "silver"):
-		return "Silver"
-	case strings.EqualFold(trimmed, "gold"):
-		return "Gold"
-	default:
-		return trimmed
+	lower := strings.ToLower(trimmed)
+	canonical := map[string]string{
+		"tin":    "Tin",
+		"bronze": "Bronze",
+		"silver": "Silver",
+		"gold":   "Gold",
 	}
+	if val, ok := canonical[lower]; ok {
+		return val
+	}
+	return trimmed
 }
 
 func (c *CronTask) reportsDir() string {