feat: updated docs and added description to files

Backend/models/absence.go

@@ -1,8 +1,19 @@
+// the models package contains the datamodels for the whole webserver
+// most of them are also in the DB
+//
+// in the future it would be good to change it to create a repository structure,
+// so that there would be a second pacakge handling db requests
+
 package models
 
+// this file has all functions and types to handle absences
+// the absence type implements the iWorkDay interface so that
+// it can be used as one workday
+//
+// the absence data is based on the entries in the "abwesenheit" database table
+
 import (
 	"encoding/json"
-	"errors"
 	"log"
 	"time"
 )
@@ -27,25 +38,6 @@ func (a *Absence) IsEmpty() bool {
 	return false
 }
 
-func NewAbsence(card_uid string, abwesenheit_typ int, datum time.Time) (Absence, error) {
-	if abwesenheit_typ < 0 {
-		return Absence{
-			CardUID:        card_uid,
-			AbwesenheitTyp: AbsenceType{0, "Custom absence", 100},
-			DateFrom:       datum,
-		}, nil
-	}
-	_absenceType, ok := GetAbsenceTypesCached()[int8(abwesenheit_typ)]
-	if !ok {
-		return Absence{}, errors.New("Invalid absencetype")
-	}
-	return Absence{
-		CardUID:        card_uid,
-		AbwesenheitTyp: _absenceType,
-		DateFrom:       datum,
-	}, nil
-}
-
 func (a *Absence) Date() time.Time {
 	return a.Day.Truncate(24 * time.Hour)
 }