Function route_from_query 

pub fn route_from_query(
    query: &AnalyzedQuery,
    catalog: &Catalog,
    opts: &BuildOptions,
) -> Result<Option<SqlRoute>, RouteBuildError>

Build a RouteMetadata (as JSON) from one analyzed query. Returns Ok(None) when the query has no @http directive — those are skipped silently so SQL files can mix HTTP and non-HTTP queries freely.