A change output's confirmation is credited by two independent, unordered
paths: the Electrum listener (event-driven, near-instant — credits it as
a UtxoEvent and folds it into cached_balance_sats via recompute_balance)
and this module's PendingTransaction.status flip (tx/confirmation.py,
polled every 10s). The listener normally wins that race, so for the gap
until the poller catches up, compute_pending_balance kept adding the same
change on top of a cached_balance_sats that already included it —
observed live as a user's displayed balance briefly jumping by exactly
the change amount before self-correcting a few seconds later.
Fix: skip any change output whose (txid, vout) already has a UtxoEvent
for this user before summing pending_change_sats.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
davideandClaude Sonnet 5
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