We do not recommend or support direct manipulation of CA SDM data via DB queries/tools.
You will need to use the pdm_extract and pdm_load utilities.
As always, we recommend testing any changes in a non-PROD environment first.
From a high level, here are the steps you will need to do:
1. Take backup of MDB database
2. Using the pdm_extract utility, extract the records of the users that you want to change
3. Edit the file with a text editor to change the Access Type to the Request Manager role (c_acctyp_id=xxxxx)
4. Save the changes to the modified file (i.e. usp_new.txt)
5. Load the modified file
pdm_load -f usp_new.txt
6. Do the same changes to the ca_contact table
7. Restart CA SDM services