[keycloak-user] manipulate IdP attributes in authentication script

Hi, I'd like to know if it is possible to add a Script execution to "first broker login" and somehow manipulate (set/see/etc...) the user's IdP information? I'm asking this cause my Identity Provider is a federation (like eduGAIN), and I am having issues when users use the same credentials in 2 different IdPs...in Keycloak all attributes will be the same except the identity_provider_id which will cause a conflict (violates unique_id constraint) with the already existing user account in Keycloak, which already has a link to that Keycloak IdP (which in practice is a federation). Best regards, Cris