Add vCenter cache rebuild functionality and related API endpoint

db/helpers.go

@@ -1161,6 +1161,35 @@ CREATE TABLE IF NOT EXISTS vcenter_host_cache (
 	})
 }
 
+// ClearVcenterReferenceCache removes cached folder/resource-pool/host references for a vCenter.
+func ClearVcenterReferenceCache(ctx context.Context, dbConn *sqlx.DB, vcenter string) error {
+	vcenter = strings.TrimSpace(vcenter)
+	if vcenter == "" {
+		return nil
+	}
+	if err := EnsureVcenterReferenceCacheTables(ctx, dbConn); err != nil {
+		return err
+	}
+
+	tx, err := dbConn.BeginTxx(ctx, nil)
+	if err != nil {
+		return err
+	}
+	tables := []string{
+		"vcenter_folder_cache",
+		"vcenter_resource_pool_cache",
+		"vcenter_host_cache",
+	}
+	for _, tableName := range tables {
+		query := tx.Rebind(fmt.Sprintf(`DELETE FROM %s WHERE "Vcenter" = ?`, tableName))
+		if _, err := tx.ExecContext(ctx, query, vcenter); err != nil {
+			_ = tx.Rollback()
+			return err
+		}
+	}
+	return tx.Commit()
+}
+
 func LoadVcenterFolderCache(ctx context.Context, dbConn *sqlx.DB, vcenter string) (map[string]string, error) {
 	cache := make(map[string]string)
 	vcenter = strings.TrimSpace(vcenter)