Very small fixes.

src/Squidex.Domain.Apps.Entities/Rules/RuleGrain.cs

@@ -119,7 +119,7 @@ namespace Squidex.Domain.Apps.Entities.Rules
         {
             if (Snapshot.IsDeleted)
             {
-                throw new DomainException("Webhook has already been deleted.");
+                throw new DomainException("Rule has already been deleted.");
             }
         }
 

tools/Migrate_01/Migrations/PopulateGrainIndexes.cs

@@ -82,11 +82,11 @@ namespace Migrate_01.Migrations
         {
             var rulesByApp = new Dictionary<Guid, HashSet<Guid>>();
 
-            await statesForRules.ReadAllAsync((schema, version) =>
+            await statesForRules.ReadAllAsync((rule, version) =>
             {
-                if (!schema.IsDeleted)
+                if (!rule.IsDeleted)
                 {
-                    rulesByApp.GetOrAddNew(schema.AppId.Id).Add(schema.Id);
+                    rulesByApp.GetOrAddNew(rule.AppId.Id).Add(rule.Id);
                 }
 
                 return TaskHelper.Done;