JJ: Description from the destination commit:

+ wire

JJ: Description from source commit:
+ drain

src/pg_type.ml

@@ -24,7 +24,6 @@ let eddsa_sig = EddsaSignature.caqti
 (* todo: enum type for wire_method? *)
 let wire_method = Caqti_type.string
 let payto_uri = Caqti_type.string
-let b32 = B32.caqti
 
 include struct
   (* alias for hash *)
@@ -266,7 +265,7 @@ let drain_profit_message =
           amount;
           master_sig;
         })
-    Caqti_type.(t6 b32 string string time amount master_sig)
+    Caqti_type.(t6 octets string string time amount master_sig)
 
 let aml_officer_setup =
   let master_sig = Signatures.MasterAmlOfficerStatus.caqti in