Include sequences in data source definition.

Include SQL statements for duckdb statements.

Add example service as well as data source for duckdb.

Ensure root can be called with any method.

Dynamic attributes for metadata are included for createdAt and updatedAt.

Include example project and requests.

Tidy up some parts of the codebase.

Genericize data used for data source tests.

Check result data in tests.

Include data source tests for query and initialization.