actionDB returned the Unscoped instance of the action's session, whose
conditions accumulate, so a bulk activate, deactivate or restore of two
applicable rows wrote only the first (the second update matched
"id = A AND id = B") while still counting it. A bulk deactivate
therefore left the other administrators active and signed in (D-10,
D-12). actionDB now ends with a plain Session, so every query starts
anew. Found by TestAdministratorsLifecycle.
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