desc = db.Column(db.UnicodeText, nullable=True)
type = db.Column(db.Enum(PackageType))
created_at = db.Column(db.DateTime, nullable=False, default=datetime.datetime.utcnow)
+ approved_at = db.Column(db.DateTime, nullable=True, default=None)
name_valid = db.CheckConstraint("name ~* '^[a-z0-9_]+$'")