reminder-bot/migrations/20230812111348_orphan_reminders.sql

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-- Drop existing constraint
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ALTER TABLE `reminders` DROP CONSTRAINT `reminders_ibfk_1`;
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ALTER TABLE `reminders` MODIFY COLUMN `channel_id` INT UNSIGNED;
ALTER TABLE `reminders` ADD COLUMN `guild_id` INT UNSIGNED;
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ALTER TABLE `reminders`
ADD CONSTRAINT `guild_id_fk`
FOREIGN KEY (`guild_id`)
REFERENCES `guilds`(`id`)
ON DELETE CASCADE;
ALTER TABLE `reminders`
ADD CONSTRAINT `channel_id_fk`
FOREIGN KEY (`channel_id`)
REFERENCES `channels`(`id`)
ON DELETE SET NULL;
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UPDATE `reminders` SET `guild_id` = (SELECT guilds.`id` FROM `channels` INNER JOIN `guilds` ON channels.guild_id = guilds.id WHERE reminders.channel_id = channels.id);