models.py

from django.db import models

#======= Abstract models =========#
class Person(models.Model):
    name = models.CharField(max_length=255)
    date_of_birth = models.DateTimeField()
    date_of_joining = models.DateTimeField()
    address = models.TextField()

    class Meta:
        abstract = True

class SchoolEmployee(Person):
    compensation = models.CharField(max_length=255)

    class Meta:
        abstract = True

class HiredHelp(SchoolEmployee):
    shift_timings = models.JSONField()

    class Meta:
        abstract = True
#--------------------------------#

#======= Actual models ==========#
class Student(Person):
    roll_number = models.IntegerField()

class Teacher(SchoolEmployee):
    qualifications = models.JSONField()

class CafeteriaEmployee(HiredHelp):
    pass

class CleaningStaffMember(HiredHelp):
    pass
#--------------------------------#