Use the DATATYPE_USERDATA as the prefix for the NewSubPrefixDb func

internal/handlers/ussd/menuhandler.go

@@ -85,8 +85,10 @@ func NewHandlers(appFlags *asm.FlagParser, userdataStore db.Db, adminstore *util
 	userDb := &common.UserDataStore{
 		Db: userdataStore,
 	}
-	// Instantiate the SubPrefixDb with "vouchers" prefix
-	prefixDb := storage.NewSubPrefixDb(userdataStore, []byte("vouchers"))
+
+	// Instantiate the SubPrefixDb with "DATATYPE_USERDATA" prefix
+	prefix := common.IntToBytes(db.DATATYPE_USERDATA)
+	prefixDb := storage.NewSubPrefixDb(userdataStore, prefix)
 
 	h := &Handlers{
 		userdataStore:  userDb,

internal/handlers/ussd/menuhandler_test.go

@@ -22,6 +22,7 @@ import (
 	testdataloader "github.com/peteole/testdata-loader"
 	"github.com/stretchr/testify/require"
 
+	visedb "git.defalsify.org/vise.git/db"
 	memdb "git.defalsify.org/vise.git/db/mem"
 	dataserviceapi "github.com/grassrootseconomics/ussd-data-service/pkg/api"
 )
@@ -56,7 +57,8 @@ func InitializeTestSubPrefixDb(t *testing.T, ctx context.Context) *storage.SubPr
 	if err != nil {
 		t.Fatal(err)
 	}
-	spdb := storage.NewSubPrefixDb(db, []byte("vouchers"))
+	prefix := common.IntToBytes(visedb.DATATYPE_USERDATA)
+	spdb := storage.NewSubPrefixDb(db, prefix)
 
 	return spdb
 }