old_contents: import datetime
  from ..extensions import db
  
  class Project(db.Model):
      __tablename__ = 'project'
      id = db.Column(db.Integer, primary_key=True)
      login = db.Column(db.String(60), index=True)
      name = db.Column(db.String(60), index=True)
      full_name = db.Column(db.String(60))
      html_url = db.Column(db.String(60))
      data = db.Column(db.PickleType())
      updated = db.Column(db.DateTime(timezone=False), default=datetime.datetime)
  
new_contents: import datetime
  from ..extensions import db, github
  
  class Project(db.Model):
      __tablename__ = 'project'
      id = db.Column(db.Integer, primary_key=True)
      login = db.Column(db.String(60), index=True)
      name = db.Column(db.String(60), index=True)
      full_name = db.Column(db.String(60))
      html_url = db.Column(db.String(60))
      data = db.Column(db.PickleType())
  
      def cache_update(self, data):
          self.html_url = data['html_url']
          self.name = data['name']
          self.data = data
  
subject: remove column