The account record information under Rule 17a-3(a)(17) and every record made under paragraph (a)(35) must be kept for at least six years, measured from whichever comes first: closure of the account, or the collection, provision, replacement or updating of the information. Superseded profile versions therefore stay on file for six years after replacement rather than being overwritten.
The graph holds this control, the 0 it maps to, and the evidence behind each claim, over MCP and REST.