text: from playhouse.migrate import PostgresqlMigrator, migrate
  
  from redash.models import db
  from redash import models
  
  if __name__ == '__main__':
      db.connect_db()
      migrator = PostgresqlMigrator(db.database)
  
      with db.database.transaction():
          migrate(
              migrator.add_column('queries', 'last_modified_by_id', models.Query.last_modified_by)
          )
  
          db.database.execute_sql("UPDATE queries SET last_modified_by_id = user_id;")
  
      db.close_db(None)
  