sig
val flush :
Ketrew_engine.t ->
(unit,
[> `Database of Trakeva.Error.t
| `Database_unavailable of Ketrew_target.id ])
Ketrew_unix_io.Deferred_result.t
val get_all :
Ketrew_engine.t ->
(Ketrew_measurement.Collection.t,
[> `Database of Trakeva.Error.t
| `Deserialization of exn * string
| `Missing_data of string ])
Ketrew_unix_io.Deferred_result.t
end