old_contents: from zou.app import db
  from zou.app.models.serializer import SerializerMixin
  from zou.app.models.base import BaseMixin
  
  
  class Software(db.Model, BaseMixin, SerializerMixin):
      name = db.Column(db.String(40), unique=True, nullable=False)
      short_name = db.Column(db.String(20), nullable=False)
      file_extension = db.Column(db.String(20), nullable=False)
  
new_contents: from zou.app import db
  from zou.app.models.serializer import SerializerMixin
  from zou.app.models.base import BaseMixin
  
  from sqlalchemy.dialects.postgresql import JSONB
  
  
  class Software(db.Model, BaseMixin, SerializerMixin):
      name = db.Column(db.String(40), unique=True, nullable=False)
      short_name = db.Column(db.String(20), nullable=False)
      file_extension = db.Column(db.String(20), nullable=False)
      secondary_extensions = db.Column(JSONB)
  
subject: Add a secondary extension field to software model