-- DropForeignKey
ALTER TABLE `ai_chat_messages` DROP FOREIGN KEY `fk_ai_chat_conv`;

-- AlterTable
ALTER TABLE `quotations` MODIFY `project_code` VARCHAR(100) NULL;

-- AddForeignKey
ALTER TABLE `ai_chat_messages` ADD CONSTRAINT `ai_chat_messages_conversation_id_fkey` FOREIGN KEY (`conversation_id`) REFERENCES `ai_conversations`(`id`) ON DELETE CASCADE ON UPDATE CASCADE;