text: -- DropForeignKey
  ALTER TABLE `Blockchain` DROP FOREIGN KEY `Blockchain_tokenId_fkey`;
  
  -- CreateTable
  CREATE TABLE `_BlockchainToToken` (
      `A` VARCHAR(191) NOT NULL,
      `B` VARCHAR(191) NOT NULL,
  
      UNIQUE INDEX `_BlockchainToToken_AB_unique`(`A`, `B`),
      INDEX `_BlockchainToToken_B_index`(`B`)
  ) DEFAULT CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;
  
  -- AddForeignKey
  ALTER TABLE `_BlockchainToToken` ADD FOREIGN KEY (`A`) REFERENCES `Blockchain`(`id`) ON DELETE CASCADE ON UPDATE CASCADE;
  
  -- AddForeignKey
  ALTER TABLE `_BlockchainToToken` ADD FOREIGN KEY (`B`) REFERENCES `Token`(`id`) ON DELETE CASCADE ON UPDATE CASCADE;
  