in the data schemas folder, is there any other eventhisto schema with a different namespace ("nms")? if yes paste the code in here.

Can you share a screenshot of the xml schema structure

Depends on your installation but usually under

There are hundreds of fields that are not used most of the time on Adobe Campaign and will probably never get populated, just ignore them. You may end up breaking some kind of relationship between tables or get errors on the console as these fields are referenced by input forms and other features.

Why do you need to delete it? this is required for push notifications to work.

I support Vipuls approach.@OP what are you trying to achieve by deleting OOTB attributes?

That alerttype field does not seem an OOTB field, what version of Adobe Campaign are you running? could it be that your eventhisto schema was extended and this new field was added?

You need to whitelist the IP/range through security zones. or on that particular account on Operators.Go to "Administration\Access Management\ Operators\%youracc%\ Access Rights\" then go to lower panel "Security settings" Edit the access parameters and start from there. ​more information here https...

I executed that code from a workflow.

Add a Scheduler activity and configure it to execute every month.