diff --git a/advlabdb/models.py b/advlabdb/models.py
index 37a6865..2304d2e 100644
--- a/advlabdb/models.py
+++ b/advlabdb/models.py
@@ -109,10 +109,10 @@ class PartStudent(db.Model):
                 f"Group's program {group.program} and student part's program {part.program} do not match!"
             )
 
-    def __init__(self, student, part, group=None):
+    def __init__(self, part, group=None, **kwargs):
         PartStudent.check(part, group)
 
-        super().__init__(student=student, part=part, group=group)
+        super().__init__(part=part, group=group, **kwargs)
 
     def checkThenSetFinalPartMark(self):
         """
@@ -274,10 +274,10 @@ class GroupExperiment(db.Model):
                             f"{student} has already done {semester_experiment.experiment} in {partStudent.part} and had {experimentMark}!"
                         )
 
-    def __init__(self, semester_experiment, group):
+    def __init__(self, semester_experiment, group, **kwargs):
         GroupExperiment.check(semester_experiment, group)
 
-        super().__init__(semester_experiment=semester_experiment, group=group)
+        super().__init__(semester_experiment=semester_experiment, group=group, **kwargs)
 
         for partStudent in group.part_students:
             db.session.add(ExperimentMark(part_student=partStudent, group_experiment=self))
@@ -467,15 +467,10 @@ class Appointment(db.Model):
 
         return assistant
 
-    def __init__(self, date, special, group_experiment, assistant=None):
+    def __init__(self, group_experiment, assistant=None, **kwargs):
         assistant = Appointment.checkAndGetAssistant(group_experiment, assistant)
 
-        super().__init__(
-            date=date,
-            special=special,
-            group_experiment=group_experiment,
-            assistant=assistant,
-        )
+        super().__init__(group_experiment=group_experiment, assistant=assistant, **kwargs)
 
     def custom_update(self, date, special, group_experiment, assistant=None):
         self.assistant = Appointment.checkAndGetAssistant(group_experiment, assistant)
@@ -526,14 +521,14 @@ class Semester(db.Model):
     def __str__(self):
         return self.str()
 
-    def __init__(self, label, year):
+    def __init__(self, label, year, **kwargs):
         last_semester = Semester.lastSemester()
 
         if last_semester is not None:
             if year < last_semester.year or (year == last_semester.year and label == "SS"):
                 raise DatabaseException(f"You can only create semesters older than the last semester {last_semester}!")
 
-        super().__init__(label=label, year=year)
+        super().__init__(label=label, year=year, **kwargs)
 
     @staticmethod
     def initFromOldSemester(label, year, oldSemester, transferParts, transferAssistants):
@@ -625,10 +620,10 @@ class ExperimentMark(db.Model):
             if group_experiment not in part_student.group.group_experiments:
                 raise DatabaseException("The group of the part student does not have the given group experiment!")
 
-    def __init__(self, part_student, group_experiment):
+    def __init__(self, part_student, group_experiment, **kwargs):
         ExperimentMark.check(part_student, group_experiment)
 
-        super().__init__(part_student=part_student, group_experiment=group_experiment)
+        super().__init__(part_student=part_student, group_experiment=group_experiment, **kwargs)
 
     def update_final_experiment_mark(self):
         """