code: def merge(self, name='initial'):
          
          migrator = Migrator(self.database)
          migrate = compile_migrations(migrator, self.migrator.orm.values())
          if not migrate:
              return self.logger.error("Can't merge migrations")
  
          self.clear()
  
          self.logger.info('Merge migrations into "%s"', name)
          rollback = compile_migrations(self.migrator, [])
          name = self.compile(name, migrate, rollback, 0)
  
          migrator = Migrator(self.database)
          self.run_one(name, migrator, fake=True, force=True)
          self.logger.info('Migrations has been merged into "%s"', name)
docs: Merge migrations into one.