val validDbname = CharVector.all Char.isAlpha
-type handler = {adduser : string -> string option,
- createdb : {user : string, dbname : string} -> string option}
+type handler = {getpass : (unit -> Client.passwd_result) option,
+ adduser : {user : string, passwd : string option} -> string option,
+ passwd : {user : string, passwd : string} -> string option,
+ createdb : {user : string, dbname : string} -> string option,
+ dropdb : {user : string, dbname : string} -> string option,
+ grant : {user : string, dbname : string} -> string option}
val dbmses : handler StringMap.map ref = ref StringMap.empty