ClientService.ResetAllTraffics zeroed up/down but, unlike every sibling reset
path, never restored enable=true, so clients that had been auto-disabled for
exceeding their quota stayed cut with zero usage after a reset. It also wrote
client_traffics directly on the shared DB handle instead of through the serial
traffic writer, reintroducing the cross-transaction lock-order deadlock the
writer exists to prevent. Restore enable and run the reset inside
submitTrafficWrite within one transaction.
addTrafficLocked stages the inbound and client deltas, then runs three helpers
(auto-renew, disable depleted clients, disable depleted inbounds) that are meant
to log and continue. All three reused the function-scope err that the deferred
commit/rollback inspects, so the last helper's error decided the whole tick: a
failure in disableInvalidInbounds rolled back the already-staged traffic while
AddTraffic reported success, and because xray had already advanced its counter
baseline that traffic was lost for good. Give each best-effort helper its own
error variable so only a genuine staging failure rolls the tick back.
MHSanaei