old_contents: #!flask/bin/python
  from migrate.versioning import api
  from config import SQLALCHEMY_DATABASE_URI
  from config import SQLALCHEMY_MIGRATE_REPO
  from app import db
  import os.path
  db.create_all()
  if not os.path.exists(SQLALCHEMY_MIGRATE_REPO):
      api.create(SQLALCHEMY_MIGRATE_REPO, 'database repository')
      api.version_control(SQLALCHEMY_DATABASE_URI, SQLALCHEMY_MIGRATE_REPO)
  else:
      api.version_control(SQLALCHEMY_DATABASE_URI, SQLALCHEMY_MIGRATE_REPO,
                          api.version(SQLALCHEMY_MIGRATE_REPO))
  
new_contents: #!flask/bin/python
  from migrate.versioning import api
  from config import SQLALCHEMY_DATABASE_URI
  from config import SQLALCHEMY_MIGRATE_REPO
  from app import db
  import os.path
  from app.models import User
  
  db.create_all()
  if not os.path.exists(SQLALCHEMY_MIGRATE_REPO):
      api.create(SQLALCHEMY_MIGRATE_REPO, 'database repository')
      api.version_control(SQLALCHEMY_DATABASE_URI, SQLALCHEMY_MIGRATE_REPO)
  else:
      api.version_control(SQLALCHEMY_DATABASE_URI, SQLALCHEMY_MIGRATE_REPO,
                          api.version(SQLALCHEMY_MIGRATE_REPO))
  
  root = User(username = 'root', password = 'root', role = '1')
  
  db.session.add(root)
  db.session.commit()
  
subject: add root user