I am unable to recollect correctly, but I think below can work.
It may be because the created_by field in database table still holds the creator information. I think for your use case, replace below with admin
INV_INVESTMENTS.CREATED_BY
ODF_CA_IDEA.CREATED_BY
INV_IDEAS.INITIATOR_ID
Also, backup the original creator to some custom field.
Another option would be try using IDEA XOG and see if you can find the attributes such as initiator etc so that DB changes can be avoided.
Please test the above only in DEV and by the way, I hope you know the consequences doing direct DB changes.