-- AlterTable
ALTER TABLE `Message`
ADD COLUMN `answer` VARCHAR(191) NULL,
ADD COLUMN `answerDate` DATETIME(3) NULL,
ADD COLUMN `shownDate` DATETIME(3) NULL,
ADD COLUMN `surveyId` INTEGER NULL;

-- CreateTable
CREATE TABLE `Survey` (
    `id` INTEGER NOT NULL AUTO_INCREMENT,
    `content` VARCHAR(191) NOT NULL,
    `answers` JSON NULL,
    `publicFrom` DATETIME(3) NULL,
    `publicUntil` DATETIME(3) NULL,


    PRIMARY KEY (`id`)
) DEFAULT CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;

-- AddForeignKey
ALTER TABLE `Message`
ADD CONSTRAINT `Message_surveyId_fkey` FOREIGN KEY (`surveyId`) REFERENCES `Survey` (`id`) ON DELETE SET NULL ON UPDATE CASCADE;