remove unique index of TenantId and Name from Site table as site name does not need to be unique. Remove TenantId column from Site table as it is not necessary and should be obtained from the Alias.

Oqtane.Client/Modules/Admin/SystemInfo/Index.razor

@@ -271,7 +271,7 @@
         }
 
         var tenants = await TenantService.GetTenantsAsync();
-        _tenant = tenants.Find(item => item.TenantId == PageState.Site.TenantId).Name;
+        _tenant = tenants.Find(item => item.TenantId == PageState.Alias.TenantId).Name;
         _history = await MigrationHistoryService.GetMigrationHistoryAsync();
 
         _initialized = true;