old_contents: 'use strict';
  
  require('db-migrate-shared').log.setLogLevel('error');
  
  const { getInstance } = require('db-migrate');
  
  function migrateDb({ db, databaseSchema = 'public' }) {
      const custom = { ...db, schema: databaseSchema };
      const dbmigrate = getInstance(true, {
          cwd: __dirname,
          config: { custom },
          env: 'custom',
      });
      return dbmigrate.up();
  }
  
  module.exports = migrateDb;
  
new_contents: 'use strict';
  
  require('db-migrate-shared').log.setLogLevel('error');
  
  const { getInstance } = require('db-migrate');
  
  function migrateDb({ db }) {
      const custom = { ...db };
      const dbmigrate = getInstance(true, {
          cwd: __dirname,
          config: { custom },
          env: 'custom',
      });
      return dbmigrate.up();
  }
  
  module.exports = migrateDb;
  
subject: use db config with schema for db-migrate