i ran
./symfony doctrine:build --all --and-load --no-confirmation
with the example's schema.yml file and all the tables and model classes in symfony populated nicely. however when i changed that schema.yml file completely by deleting all the example tables and rewrote my own, the database didn't delete the old changes nor did it delete any of the model classes. it just added the new tables into the database.
how can i get doctrine to "forget" about the old schema.yml ?