using System.Security.Claims; namespace Shared.Excel; public static class ImportIdentity { public static string TenantId(ClaimsPrincipal user) => user.FindFirst("tenant_id")?.Value ?? user.FindFirst("tenant")?.Value ?? "default"; public static string UserId(ClaimsPrincipal user) => user.FindFirst(ClaimTypes.NameIdentifier)?.Value ?? user.Identity?.Name ?? "unknown"; }