C# 14's new extension members greatly improve on traditional extension methods by allowing developers to add not just methods, but also properties and other instance members to existing types.

Exact vector search is a solid starting point. Once volume grows, approximate vector search with vector indexes a offer fast alternative with relevant results instead of exhaustive comparison on every row.

Facet is a powerful source generator tool that can help you improve your mapping code. It's easy to use, test and integrate with other libraries.