Rewrite oauth application owner to deleted user

[OP#42311](https://community.openproject.org/wp/42311)

app/services/principals/replace_references_service.rb

@@ -48,6 +48,7 @@ module Principals
       rewrite_assigned_to(from, to)
       rewrite_responsible(from, to)
       rewrite_actor(from, to)
+      rewrite_owner(from, to)
     end
 
     def rewrite_custom_value(from, to)
@@ -107,6 +108,12 @@ module Principals
       end
     end
 
+    def rewrite_owner(from, to)
+      [::Doorkeeper::Application].each do |klass|
+        klass.where(owner_id: from.id).update_all(owner_id: to.id)
+      end
+    end
+
     def rewrite_assigned_to(from, to)
       [WorkPackage].each do |klass|
         klass.where(assigned_to_id: from.id).update_all(assigned_to_id: to.id)

spec/services/principals/replace_references_service_call_integration_spec.rb

@@ -419,5 +419,22 @@ describe Principals::ReplaceReferencesService, '#call', type: :model do
         end
       end
     end
+
+    context 'with OAuth application' do
+      it_behaves_like 'rewritten record',
+                      :oauth_application,
+                      :owner_id do
+        let(:attributes) do
+          {
+            name: "'foo'",
+            uid: "'bar'",
+            secret: "'bar'",
+            redirect_uri: "'urn:whatever'",
+            created_at: 'NOW()',
+            updated_at: 'NOW()'
+          }
+        end
+      end
+    end
   end
 end