text: DELETE FROM sessions;
  ALTER TABLE "sessions" ADD COLUMN "token" VARCHAR (32);COMMIT TRANSACTION;BEGIN TRANSACTION;
  ALTER TABLE "sessions" RENAME COLUMN "token" TO "_token_tmp";COMMIT TRANSACTION;BEGIN TRANSACTION;
  ALTER TABLE "sessions" ADD COLUMN "token" VARCHAR (32);COMMIT TRANSACTION;BEGIN TRANSACTION;
  UPDATE "sessions" SET "token" = "_token_tmp";COMMIT TRANSACTION;BEGIN TRANSACTION;
  ALTER TABLE "sessions" DROP COLUMN "_token_tmp";COMMIT TRANSACTION;BEGIN TRANSACTION;
  CREATE UNIQUE INDEX "sessions_token_uq_idx" ON "sessions" (token);COMMIT TRANSACTION;BEGIN TRANSACTION;
  CREATE INDEX "sessions_token_idx" ON "sessions" (token);COMMIT TRANSACTION;BEGIN TRANSACTION;