This is related to SQL-Mapping, which is still experimental, maybe you should wait for the next version if you wish to use it.
;; config #:sql-mapping config-patterns ;; apply (:sql-mapping <route-context> command ...)
config-patterns can be any of:
#t
enable the simple sql-mapping.
`(path ,path ,name)
Fetch the sql-mapping with name in the specified path.
`(add ,name ,sql-template)
Fetch the sql-mapping with name rendered from sql-template.