Mahmoud Elgeiziry

found a bug when min equals max the method of `double valueToPercentage(double value, double min, double max) { return value / ((max - min) / 100); } ` in utils.dart...

the [sb.go](https://github.com/qor/qor-example/blob/57633ac0f7fd03fbe855e0f6c29f33ab1ee34ef7/config/db/db.go#L31) file in case of postgres connection is missing port config, resulting in password authentication failed for user error.