new_contents: import time
  import uuid
  
  from .orm import Model, StringField, BooleanField, FloatField, TextField
  
  
  def next_id():
      return '%015d%s000' % (int(time.time() * 1000), uuid.uuid4().hex)
  
  
  class User(Model):
      __table__ = 'users'
  
      id = StringField(primary_key=True, default=next_id, ddl='varchar(50)')
      email = StringField(ddl='varchar(50)')
      passwd = StringField(ddl='varchar(50)')
      admin = BooleanField()
      name = StringField(ddl='varchar(50)')
      image = StringField(ddl='varchar(500)')
      created_at = FloatField(default=time.time)
  
  
  class Blog(Model):
      __table__ = 'blogs'
  
      id = StringField(primary_key=True, default=next_id, ddl='varchar(50)')
      user_id = StringField(ddl='varchar(50)')
      user_name = StringField(ddl='varchar(50)')
      user_image = StringField(ddl='varchar(500)')
      name = StringField(ddl='varchar(50)')
      summary = StringField(ddl='varchar(200)')
      content = TextField()
      created_at = FloatField(default=time.time)
  
  
  class Comment(Model):
      __table__ = 'comments'
  
      id = StringField(primary_key=True, default=next_id, ddl='varchar(50)')
      blog_id = StringField(ddl='varchar(50)')
      user_id = StringField(ddl='varchar(50)')
      user_name = StringField(ddl='varchar(50)')
      user_image = StringField(ddl='varchar(500)')
      content = TextField()
  
  
  created_at = FloatField(default=time.time)
  
subject: add models.py