feat: locking days, if they are submitted and accepted

fixed #76

Backend/models/booking.go

@@ -95,27 +95,6 @@ func (b *Booking) Verify() bool {
 	return true
 }
 
-func (b *Booking) IsSubmittedAndChecked() bool {
-	qStr, err := DB.Prepare(`SELECT bestaetigt from wochen_report WHERE $1 = ANY(anwesenheiten);`)
-	if err != nil {
-		slog.Warn("Error when preparing SQL Statement", "error", err)
-		return false
-	}
-	defer qStr.Close()
-	var isSubmittedAndChecked bool = false
-
-	err = qStr.QueryRow(b.CounterId).Scan(&isSubmittedAndChecked)
-	if err == sql.ErrNoRows {
-		// No rows found ==> not even submitted
-		return false
-	}
-
-	if err != nil {
-		slog.Warn("Unexpected error when executing SQL Statement", "error", err)
-	}
-	return isSubmittedAndChecked
-}
-
 func (b *Booking) Insert() error {
 	if !checkLastBooking(*b) {
 		return SameBookingError{}