Pandas to_sql doesn't insert any data in my table

Try to specify a schema name:

result.to_sql('ds_attribution_probabilities', con=engine, 
              schema='online', index=False, if_exists='append')

Hopefully this helps someone else. to_sql will fail silently in the form of what looks like a successful insert if you pass a connection object. This is definitely true for Postgres, but i assume the same for others as well, based on the method docs:

con : sqlalchemy.engine.Engine or sqlite3.Connection
    Using SQLAlchemy makes it possible to use any DB supported by that
    library. Legacy support is provided for sqlite3.Connection objects.

This got me because the typing hints stated Union[Engine, Connection], which is "technically" true.

If you have a session with SQLAlchemy try passing con=session.get_bind(),

I had a similar issue caused by the fact that I was passing sqlalchemy connection object instead of engine object to the con parameter. In my case tables were created but left empty.