old_contents: from ns_portal.database.meta import (
      Main_Db_Base
  )
  from sqlalchemy import (
      Column,
      DateTime,
      Float,
      ForeignKey,
      Integer,
      Numeric,
      String,
      Sequence,
      func
  )
  from sqlalchemy.dialects.mssql import (
      UNIQUEIDENTIFIER
  )
  
  
  class AuthorizationCode(Main_Db_Base):
      __tablename__ = 'AuthorizationCode'
  
      ID = Column(
          UNIQUEIDENTIFIER,
          primary_key=True
      )
      creationDate = Column(
          DateTime(timezone=True),
          nullable=False,
          server_default=func.now()
      )
  
new_contents: from ns_portal.database.meta import (
      Main_Db_Base
  )
  from sqlalchemy import (
      Column,
      DateTime,
      func
  )
  from sqlalchemy.dialects.mssql import (
      UNIQUEIDENTIFIER
  )
  
  
  class AuthorizationCode(Main_Db_Base):
      __tablename__ = 'AuthorizationCode'
  
      ID = Column(
          UNIQUEIDENTIFIER,
          primary_key=True
      )
      creationDate = Column(
          DateTime(timezone=True),
          nullable=False,
          server_default=func.now()
      )
  
subject: remove useless import