Extends the 'mlr3' package with a backend to transparently work with databases. Includes two extra backends: One relies on relies on the abstraction of package 'dbplyr' to interact with one of the many supported database management systems (DBMS). The other one is specialized for package 'duckdb'.

## Options

• mlr3db.sqlite_dir: Default directory to store SQLite databases constructed with as_sqlite_backend()..

• mlr3db.sqlite_dir: Default directory to store DuckDB databases constructed with as_duckdb_backend()..