Table Column attribute not released after deleting a DFF

Summary:

I had created a Job Offer DFF as a context segment initially with table column attribute ATTRIBUTE_NUMBER1. And we use this attribute to pull the value in the offer letter. Now due to limitations in using context segments in offer approval rules, we have decided to move this to global segment but need to use the same table column attribute.

So I went into Manage Contexts and deleted this DFF to release the table column attribute ATTRIBUTE_NUMBER1. The deployed, signed out and signed in. Now when i create the DFF in global segment, i dont see the table column ATTRIBUTE_NUMBER1. But when i try creating the DFF into the context segment again, i am able to see ATTRIBUTE_NUMBER1.