text: 
  exports.up = function(knex) {
      return knex.schema.createTable("tweets", tbl => {
          tbl.increments();
          tbl.string("tweet", 290)
              .notNullable();
          tbl.integer("candidate_id")
              .unsigned().notNullable()
              .references('id').inTable('candidates')
              .onDelete()
              .onUpdate('CASCADE')
      })
  };
  
  exports.down = function(knex) {
      return knex.schema.dropTableIfExists("candidates");
  };
  