The sync adopts each node's reported clients through SyncInbound, which resolves
a client record by email alone — and clients.email is globally unique. A node
reporting a colliding email therefore overwrote that client's UUID even when the
client is attached only to a master inbound, and the master then rebuilt its own
Xray config with the node-supplied credential: the real user locked out.
Skip a reported client whose record is attached only to inbounds of other nodes.
A record attached nowhere stays adoptable, so the soft-orphan reattach path a
flapping node depends on is unaffected.
Sanaei