Errors
LEASE_LOST
A stale worker tried to commit after losing its lease.
What failed
A Runtime Engine worker reached its final commit after another worker reclaimed or replaced its work lease.
Why
Leases are fencing tokens. Before completion, suspension, retry, or failure is recorded, the kernel checks that the stored work row still carries the executor's lease token.
What still works
The stale worker exits without retrying, dead-lettering, or overwriting the current owner. The worker that owns the current lease can continue and commit normally.
Fix
No action is needed for occasional races. For consistently long-running work, keep the lease heartbeat enabled where the host supports timers or increase leaseTtlMs.