let get_df_table_writer infer primary keys from df.index

the function `get_df_table_writer` expects a list of primary keys which are columns of the data frame. I however have a MultiIndex with names that should be used for the compound primary key. this is very much like the `df.to_sql` works as well. But I need a way to "REPLACE INTO" instead of inserting. I had the hope the get_df_table_writer function could do that.