# The sqlite backend (default) needs nothing beyond dagster. Install only what the backend you use needs:
#   backend: bigquery  ->  dagster-gcp
#   backend: sql       ->  sqlalchemy plus ONE driver for your database:
#                            postgres: psycopg2-binary | mysql: pymysql | snowflake: snowflake-sqlalchemy
#                            databricks: databricks-sqlalchemy | duckdb: duckdb-engine
# A missing driver raises an ImportError naming exactly what to pip install.
