caqti amount: shorter syntax for output param

src/pg.ml

@@ -7,7 +7,10 @@
    GNU Taler db-events?
    it seems caqti/pgx does not support it *)
 
+module type CONN = Caqti_miou.CONNECTION
+
 open Crypto
+open Bin_type
 
 module Caqti_type = struct
   include Caqti_type
@@ -31,7 +34,6 @@ module Caqti_type = struct
 
   include struct
     (* alias for hash *)
-    open Bin_type
 
     let fullpayto_hash = FullPaytoHash.caqti
     let nomalizaedpayto_hash = NormalizedPaytoHash.caqti
@@ -49,10 +51,6 @@ module Caqti_type = struct
   include Caqti_request.Infix
 end
 
-module type CONN = Caqti_miou.CONNECTION
-
-open Bin_type
-
 let preflight =
   let l =
     List.map
@@ -66,8 +64,7 @@ let preflight =
         "SET search_path TO exchange;";
       ]
   in
-  fun (module Conn : Caqti_miou.CONNECTION) ->
-    Syntax.list_iter (fun p -> Conn.exec p ()) l
+  fun (module Conn : CONN) -> Syntax.list_iter (fun p -> Conn.exec p ()) l
 
 let lookup_signing_key =
   let lookup_signing_key =
@@ -107,10 +104,8 @@ let lookup_denomination_key =
       denomination_hash
       ->? t10 time time time time amount amount amount amount amount age_mask)
       "SELECT valid_from, expire_withdraw, expire_deposit, expire_legal, \
-       (coin).val, (coin).frac, (fee_withdraw).val, (fee_withdraw).frac, \
-       (fee_deposit).val, (fee_deposit).frac, (fee_refresh).val, \
-       (fee_refresh).frac, (fee_refund).val, (fee_refund).frac, age_mask FROM \
-       denominations WHERE denom_pub_hash=$1"
+       (coin).*, (fee_withdraw).*, (fee_deposit).*, (fee_refresh).*, \
+       (fee_refund).*, age_mask FROM denominations WHERE denom_pub_hash=$1"
   in
   fun (module Conn : CONN) (h_denom_pub : DenominationHash.t) ->
     Conn.find_opt lookup_denomination_key h_denom_pub