Database.TDatabase.T is the (module) type of the database. In SandDB every database instance will have this type regardles of the serializing method.
val read_all_records :
unit ->
( Record_id.t * t, exn ) Stdlib.result list Lwt.tval read_visible_records :
unit ->
( Record_id.t * t, exn ) Stdlib.result list Lwt.tval insert_record : t -> Record_id.t Lwt.tval insert_shadowing_record : Record_id.t -> t -> Record_id.t Lwt.t