You can use the Customer Attribute upload dashboard for deleting users in bulk.
Prepare a csv file with the following columns. You need at least one user identifier (email or customer_id)
- _bsft_delete_user (required)
email,customer_id,_bsft_delete_user firstname.lastname@example.org,C123,true email@example.com,,true firstname.lastname@example.org,,true
Select .csv to be uploaded via direct file upload. Then map columns from .csv to standard Blueshift columns. For _bsft_delete_user column, in the attribute selection list click on "Create a new attribute" and select the "Type" as "Boolean" as shown below
Once you are done with mapping, review the sample rows and if everything looks good click on "Import Customer"
Once the upload is completed, it may take couple of mins for the user's to be completly deleted from our backend system.