val register_migration : unit -> unitval register_cleaner : unit -> unitval insert_file : ?ctx:(string * string) list -> file:Sihl.Contract.Storage.stored -> unit Lwt.tval insert_blob : ?ctx:(string * string) list -> id:string -> blob:string -> unit Lwt.tval get_file : ?ctx:(string * string) list -> id:string -> Sihl.Contract.Storage.stored option Lwt.tval get_blob : ?ctx:(string * string) list -> id:string -> string option Lwt.tval update_file : ?ctx:(string * string) list -> file:Sihl.Contract.Storage.stored -> unit Lwt.tval update_blob : ?ctx:(string * string) list -> id:string -> blob:string -> unit Lwt.tval delete_file : ?ctx:(string * string) list -> id:string -> unit Lwt.tval delete_blob : ?ctx:(string * string) list -> id:string -> unit Lwt.t