Update README.md

[ewwollesen]

Added a query to swap the Id's of two users.

[coltoneshaw]

@ewwollesen so for this we would want to have the second user take full ownership of the first users data?

What context was this used? I wonder if we need to purge sessions too, just to be safe.

[ewwollesen]

@ewwollesen so for this we would want to have the second user take full ownership of the first users data?

What context was this used? I wonder if we need to purge sessions too, just to be safe.

This is for cases when they are using Email as the IdAttribute in SAML, and a user's email gets changed for some reason (getting married, for example). When it gets changed on the SAML side and they log in, it will create a new account. So this just swaps the old account with the new account.

That's not a bad idea though to revoke their sessions too first. I added a note to recommend that.