Fill timestamp for Approver bulk insertion

ee/app/services/ee/merge_requests/refresh_service.rb

@@ -60,11 +60,15 @@ module EE
         return if users.empty?
         return unless merge_request.approvers_overwritten?
 
+        now = Time.now
+
         rows = users.map do |user|
           {
             target_id: merge_request.id,
             target_type: merge_request.class.name,
-            user_id: user.id
+            user_id: user.id,
+            created_at: now,
+            updated_at: now
           }
         end
 

ee/spec/services/ee/merge_requests/refresh_service_spec.rb

@@ -119,8 +119,12 @@ describe MergeRequests::RefreshService do
             it 'creates Approver' do
               expect { subject }.to change { Approver.count }.by(1)
 
+              new_approver = merge_request.approvers.last
+
               expect(merge_request.approvers.first.user).to eq(existing_approver)
-              expect(merge_request.approvers.last.user).to eq(owner)
+              expect(new_approver.user).to eq(owner)
+              expect(new_approver.created_at).to be_present
+              expect(new_approver.updated_at).to be_present
             end
           end
         end