``declarative_base()`` is superseded by ``DeclarativeBase`` class. More information in [1]. [1]https://docs.sqlalchemy.org/en/20/changelog/whatsnew_20.html#step-one-orm-declarative-base-is-superseded-by-orm-declarativebase Closes-Bug: #2051171 Change-Id: I5ddf9573572e52fe87bbfde9732c5af9ce398188