Feat Backend ERP 1

src/SIGCM.Domain/Entities/ExternalClientMapping.cs

@@ -0,0 +1,10 @@
+namespace SIGCM.Domain.Entities;
+
+public class ExternalClientMapping
+{
+  public int LocalUserId { get; set; }
+  public required string ExternalSystemName { get; set; } // 'Tango', 'SAP', 'CustomBilling'
+  public required string ExternalClientId { get; set; }
+  public string? AdditionalData { get; set; } // JSON
+  public DateTime LastSyncedAt { get; set; }
+}