slapd refuses to remove an RDN value, and every legacy account is cn=<name>,ou=People, so a name edit there always failed. Those accounts now see their name read-only (the view rejects the profile action and update_profile refuses as a backstop); uid-named accounts from website registration can still edit it. README documents the cn/mail self-write ACL and mail uniqueness overlay now applied in production. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>