It is Constance that created the Registry and is the person that interviewed you to join the SOS Taskforce.
As one of the lead administrators of the Taskforce, it is Constance that assigns you with most of your SOS Assignments.
It is unknown which house Constance was sorted into by the Sorting Hat.
After a series of large-scale breaches of the International Statute of Wizarding Secrecy occurred (events that were later attributed to The Calamity), Constance was requested to help set up a new Taskforce within Ministry of Magic by Hermione Granger.
During in her capacity as a member of the Statute of Secrecy Task Force, Constance "Verified" the casting of a Muggle-Repelling Charm over documents and memorandums relating to the Calamity and the SOS Taskforce, preventing Muggles from being able to see/read the information.
Constance is yet to be targeted by the Calamity and thus there are currently no Foundables related to her.