Made structural changes to server-side Preference code based on feedback

store/sql_store.go

@@ -612,11 +612,3 @@ func decrypt(key []byte, cryptoText string) (string, error) {
 
 	return fmt.Sprintf("%s", ciphertext), nil
 }
-
-// Interface for both gorp.DbMap and gorp.Transaction to allow code for one to be reused with the other
-type Queryable interface {
-	Exec(query string, args ...interface{}) (dbsql.Result, error)
-	Insert(list ...interface{}) error
-	SelectInt(query string, args ...interface{}) (int64, error)
-	Update(list ...interface{}) (int64, error)
-}