classes.fresh chained WithContext onto a lazy NewDB session, which clones the
caller's statement with its conditions. A handle that carried a condition
made IsPrivilegedMember answer false for a member of a privileged group, so
the takeover guard would have let the request through. No caller passes such
a handle today: the admin hooks hand over the write's transaction handle.
- fresh builds the empty statement before anything is chained onto it
- IsPrivilegedMember and PrivilegedGroupIDs read through fresh
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