@atwine can you try downgrade rasa x to
pip install rasa-x==0.39.3 --extra-index-url https://pypi.rasa.com/simple
Some know errors with solution
‘RowProxy’ from ‘sqlalchemy.engine’ try install
pip install SQLAlchemy==1.3.22
Sanice error with solution
pip install sanic-jwt==1.6.0
last, alembic error delete .db file and run rasa x
pip install SQLAlchemy==1.3.22
Good Luck! Hope this will help you.