markUtxosAsSpentByIntent

Mark UTXOs as spent by their intent identifiers (intentHash + outputNo).

IMPORTANT: The blockchain identifies UTXOs by intentHash + outputNo, but our database uses transactionHash:outputIndex as the primary key. This method looks up UTXOs by intentHash and then marks them by their database ID.

spentByLocalTx flag:

• true (default): Our transaction SUCCEEDED and spent this UTXO. Healing will NOT restore it (we trust our local state over indexer lag).

• false: Something else spent it (e.g., error 115 = node says already spent). Healing CAN restore it if indexer shows it's actually available.

When to use each:

• Node accepts our transaction → spentByLocalTx=true

• Error 115 (UTXO already spent) → spentByLocalTx=false (we didn't spend it!)

Parameters