rvr-nextgen/database/migrations/structure/20230423_2022_currency_exchange_rates.sql

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CREATE TABLE `currency_exchange_rates` (
`id` int(10) unsigned NOT NULL AUTO_INCREMENT,
`currency_id` int(10) unsigned NOT NULL,
`exchange_rate` decimal(19,9) unsigned NOT NULL,
`valid_from` timestamp NOT NULL DEFAULT current_timestamp(),
PRIMARY KEY (`id`),
KEY `currency_id` (`currency_id`),
INDEX `valid_from` (`valid_from`),
CONSTRAINT `currency_exchange_rates_currency_id` FOREIGN KEY (`currency_id`) REFERENCES `currencies` (`id`)
) ENGINE = InnoDB DEFAULT CHARSET = utf8mb4;