Resolve "Refactor code to use provisioned database models"

.gitlab-ci.yml

.pre-commit-config.yaml

DEVELOPING.md

alembic.ini

alembic/README

alembic/env.py

alembic/script.py.mako

...bic/versions/5521b5759004_create_user_and_bucket_table.py

...ons/6c64f020818b_make_display_name_for_users_mandatory.py

...s/83a3a47a6351_add_username_and_display_name_and_drop_.py

alembic/versions/9fa582febebe_delete_username_from_user.py

alembic/versions/cafa1e01b782_create_permission_table.py

app/api/dependencies.py

app/api/endpoints/bucket_permissions.py

app/api/endpoints/buckets.py

app/api/endpoints/login.py

app/api/endpoints/users.py

app/check_database_connection.py

app/crud/crud_bucket.py

app/crud/crud_bucket_permission.py