UNIQUE KEY `source_tx_hash` (`source_tx_hash`),
UNIQUE KEY `dest_tx_hash` (`dest_tx_hash`),
CONSTRAINT `cross_transactions_ibfk_1` FOREIGN KEY (`chain_id`) REFERENCES `chains` (`id`)
UNIQUE KEY `source_tx_hash` (`source_tx_hash`),
UNIQUE KEY `dest_tx_hash` (`dest_tx_hash`),
CONSTRAINT `cross_transactions_ibfk_1` FOREIGN KEY (`chain_id`) REFERENCES `chains` (`id`)