fixed #65, #67

Backend/models/absence.go

@@ -294,3 +294,12 @@ func GetAbsenceTypeById(absenceTypeId int8) (AbsenceType, error) {
 	}
 	return absenceType, nil
 }
+
+func (a *Absence) Delete() error {
+	qStr, err := DB.Prepare("DELETE from abwesenheit WHERE counter_id = $1;")
+	if err != nil {
+		return err
+	}
+	_, err = qStr.Exec(a.CounterId)
+	return err
+}