The Subscription-Userinfo header read total/expiry from client_traffics, but in a multi-node setup the master's node sync overwrites those with the node snapshot's zeros, so the header reported total=0; expire=0 even though the panel UI (which reads the clients table) showed the configured limits. AggregateTrafficByEmails now falls back to the clients table for total/expiry when the traffic row is zero, keeping up/down/lastOnline from client_traffics.
