processLineage handles fund lineage tracking for a transaction. It processes both credit (incoming funds with provider tracking) and debit (fund allocation from shadow balances). Parameters: - ctx context.Context: The context for the operation. - txn *model.Transaction: The transaction being proces
(ctx context.Context, txn *model.Transaction, sourceBalance, destinationBalance *model.Balance)
source not stored for this graph (policy: none)
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