old_contents: """
  Database models
  """
  
  from sqlalchemy import Column, Integer, String, DateTime, ForeignKey, Boolean
  from flask.ext.sqlalchemy import SQLAlchemy
  
  db = SQLAlchemy()
  
  
  class Commit(db.Model):
      """
      Represents a git commit
      """
      id = Column(Integer, primary_key=True)
      commit_hash = Column(String)
      timestamp = Column(DateTime)
      author = Column(String)
      repository = Column(String)
  
  
  class Build(db.Model):
      """
      Represents a docker build
      """
      id = Column(Integer, primary_key=True)
      commit_id = Column(Integer, ForeignKey('commit.id'))
      commit = db.relationship(
          'Commit',
          backref=db.backref('builds', lazy='dynamic')
      )
      timestamp = Column(DateTime)
      no_cache = Column(Boolean)
  
new_contents: """
  Database models
  """
  
  from sqlalchemy import Column, Integer, String, DateTime, ForeignKey, Boolean
  from flask.ext.sqlalchemy import SQLAlchemy
  
  db = SQLAlchemy()
  
  
  class Commit(db.Model):
      """
      Represents a git commit
      """
      id = Column(Integer, primary_key=True)
      commit_hash = Column(String)
      timestamp = Column(DateTime)
      author = Column(String)
      repository = Column(String)
  
  
  class Build(db.Model):
      """
      Represents a docker build
      """
      id = Column(Integer, primary_key=True)
      commit_id = Column(Integer, ForeignKey('commit.id'))
      commit = db.relationship(
          'Commit',
          backref=db.backref('builds', lazy='dynamic')
      )
      timestamp = Column(DateTime)
subject: remove unused no_cache field