It is possible to drop all data from your Dgraph Cloud backend, and start afresh while retaining the same endpoint. Be careful, as this operation isn’t reversible, and all data is lost. It is highly recommended that you export your data before you drop your data. In order to drop all data while retaining the schema, click Drop Data under the Schema tab in the sidebar. Drop Data

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Dropping data programmatically

In order to do this, call the dropData mutation on /admin/slash. As an example, if your GraphQL endpoint is https://frozen-mango.us-west-2.aws.cloud.dgraph.io/graphql, then the admin endpoint for schema is at https://frozen-mango.us-west-2.aws.cloud.dgraph.io/admin/slash. Please note that this endpoint requires Authentication. Please see the following curl as an example. 
curl 'https://<your-backend>/admin/slash' \
  -H 'X-Auth-Token: <your-token>' \
  -H 'Content-Type: application/graphql' \
  --data-binary 'mutation { dropData(allData: true) { response { code message } } }'
If you would like to drop the schema along with the data, then you can set the allDataAndSchema flag. 
curl 'https://<your-backend>/admin/slash' \
  -H 'X-Auth-Token: <your-token>' \
  -H 'Content-Type: application/graphql' \
  --data-binary 'mutation { dropData(allDataAndSchema: true) { response { code message } } }'