fix(ui): schema-library delete-audit name + busy guard + edit-row guard + sanitized create-race test (#260)

src/ZB.MOM.WW.ScadaBridge.CentralUI/Components/Pages/Design/SchemaLibrary.razor

@@ -93,10 +93,13 @@
                         <td>@(string.IsNullOrWhiteSpace(s.Scope) ? "—" : s.Scope)</td>
                         <td><code>lib:@s.Name</code></td>
                         <td class="text-end">
+                            @* Row actions are disabled while the editor is open so the
+                               row under edit (and its siblings) can't be deleted out from
+                               under the form, and while a delete is in flight (_busy). *@
                             <button class="btn btn-outline-primary btn-sm me-1"
-                                    @onclick="() => BeginEdit(s)">Edit</button>
+                                    @onclick="() => BeginEdit(s)" disabled="@(_editing || _busy)">Edit</button>
                             <button class="btn btn-outline-danger btn-sm"
-                                    @onclick="() => DeleteSchema(s)">Delete</button>
+                                    @onclick="() => DeleteSchema(s)" disabled="@(_editing || _busy)">Delete</button>
                         </td>
                     </tr>
                 }
@@ -208,21 +211,34 @@
 
     private async Task DeleteSchema(SharedSchema schema)
     {
+        // In-flight guard: an editor-open row action is already disabled in the markup,
+        // but the _busy gate is the authoritative guard against a double-invoked delete
+        // (and mirrors the Save path's guard).
+        if (_busy) return;
+
         var confirmed = await Dialog.ConfirmAsync(
             "Delete Schema",
             $"Delete library schema '{schema.Name}'? References to lib:{schema.Name} will no longer resolve.",
             danger: true);
         if (!confirmed) return;
 
-        var result = await SchemaLibraryService.DeleteAsync(schema.Id);
-        if (result.Success)
+        _busy = true;
+        try
         {
-            _toast.ShowSuccess($"Schema '{schema.Name}' deleted.");
-            await LoadAsync();
+            var result = await SchemaLibraryService.DeleteAsync(schema.Id);
+            if (result.Success)
+            {
+                _toast.ShowSuccess($"Schema '{schema.Name}' deleted.");
+                await LoadAsync();
+            }
+            else
+            {
+                _toast.ShowError(result.Error ?? "Delete failed.");
+            }
         }
-        else
+        finally
         {
-            _toast.ShowError(result.Error ?? "Delete failed.");
+            _busy = false;
         }
     }
 }

src/ZB.MOM.WW.ScadaBridge.CentralUI/Services/SchemaLibraryQueryService.cs

@@ -31,8 +31,11 @@ public sealed class SchemaLibraryQueryService : ISchemaLibraryQueryService
         var repo = scope.ServiceProvider.GetRequiredService<ISharedSchemaRepository>();
         var all = await repo.ListAsync(cancellationToken);
 
-        // Ordinal-keyed to match the lib:Name resolver's exact-name lookup. Last-wins on
-        // the (DB-unique) name guards against a transient duplicate read.
+        // Ordinal-keyed to match the lib:Name resolver's exact-name lookup. Name is
+        // DB-unique, so a list yields at most one row per name and no real collision
+        // occurs; the indexer assignment is defensive only — should two rows ever share
+        // a name (e.g. a mid-write transient read), the later one in enumeration order
+        // overwrites the earlier rather than throwing.
         var map = new Dictionary<string, string>(StringComparer.Ordinal);
         foreach (var schema in all)
         {

src/ZB.MOM.WW.ScadaBridge.ManagementService/ManagementActor.cs

@@ -2323,8 +2323,13 @@ public class ManagementActor : ReceiveActor
     private static async Task<object?> HandleDeleteSharedSchema(IServiceProvider sp, DeleteSharedSchemaCommand cmd, string user)
     {
         var repo = sp.GetRequiredService<ISharedSchemaRepository>();
+        // Pre-fetch the human-readable name before the row is gone so the audit
+        // EntityName records "Address" rather than the numeric id — mirroring the
+        // Site delete handler. Falls back to the id when the row is already absent.
+        var schema = await repo.GetByIdAsync(cmd.SharedSchemaId);
         await repo.DeleteAsync(cmd.SharedSchemaId);
-        await AuditAsync(sp, user, "Delete", "SharedSchema", cmd.SharedSchemaId.ToString(), cmd.SharedSchemaId.ToString(), null);
+        await AuditAsync(sp, user, "Delete", "SharedSchema", cmd.SharedSchemaId.ToString(),
+            schema?.Name ?? cmd.SharedSchemaId.ToString(), null);
         return true;
     }