The orphan sweeps in setRemoteTrafficLocked deleted the (node, email)
baseline row unconditionally whenever an email was missing from one
inbound's snapshot stats — even though baselines are keyed per node, not
per inbound. For a client attached to two inbounds of the same node whose
stats the node reports under only one of them, the sweep for the other
inbound deleted the baseline at the end of every sync cycle. Depending on
inbound order, the baseline written earlier in the same transaction was
wiped each time, so the next cycle computed delta against a missing
baseline (zero) and the client's traffic froze permanently.
Scope both sweeps to the union of emails across the whole snapshot: a
baseline is only dropped when the email left the node entirely.
MHSanaei
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