diff --git a/.gitignore b/.gitignore
index 238e0ab..445be84 100644
--- a/.gitignore
+++ b/.gitignore
@@ -139,3 +139,4 @@ dmypy.json
 /CDC_Backend/Storage/
 .idea
 *.pyc
+dev.env
diff --git a/CDC_Backend/APIs/admin.py b/CDC_Backend/APIs/admin.py
index e2a87c3..ab52c34 100644
--- a/CDC_Backend/APIs/admin.py
+++ b/CDC_Backend/APIs/admin.py
@@ -1,4 +1,5 @@
 from django.contrib import admin
+from simple_history.admin import SimpleHistoryAdmin
 from django.contrib.admin.templatetags.admin_urls import admin_urlname
 from django.shortcuts import resolve_url
 from django.utils.html import format_html
@@ -6,8 +7,8 @@ from django.utils.safestring import SafeText
 
 from .models import *
 
-admin.site.register(User)
-admin.site.register(Admin)
+admin.site.register(User, SimpleHistoryAdmin)
+admin.site.register(Admin, SimpleHistoryAdmin)
 
 admin.site.site_header = "CDC Recruitment Portal"
 
@@ -18,7 +19,7 @@ def model_admin_url(obj, name=None) -> str:
 
 
 @admin.register(Student)
-class Student(admin.ModelAdmin):
+class Student(SimpleHistoryAdmin):
     list_display = ("roll_no", "name", "batch", "branch", "phone_number", 'can_apply')
     search_fields = ("roll_no", "name", "phone_number")
     ordering = ("roll_no", "name", "batch", "branch", "phone_number")
@@ -37,7 +38,7 @@ class Student(admin.ModelAdmin):
 
 
 @admin.register(Placement)
-class Placement(admin.ModelAdmin):
+class Placement(SimpleHistoryAdmin):
     list_display = (COMPANY_NAME, CONTACT_PERSON_NAME, PHONE_NUMBER, 'tier', 'compensation_CTC')
     search_fields = (COMPANY_NAME, CONTACT_PERSON_NAME)
     ordering = (COMPANY_NAME, CONTACT_PERSON_NAME, 'tier', 'compensation_CTC')
@@ -45,7 +46,7 @@ class Placement(admin.ModelAdmin):
 
 
 @admin.register(PlacementApplication)
-class PlacementApplication(admin.ModelAdmin):
+class PlacementApplication(SimpleHistoryAdmin):
     list_display = ('id', 'Placement', 'Student', 'selected')
     search_fields = ('id',)
     ordering = ('id',)
@@ -59,7 +60,7 @@ class PlacementApplication(admin.ModelAdmin):
 
 
 @admin.register(PrePlacementOffer)
-class PrePlacementOffer(admin.ModelAdmin):
+class PrePlacementOffer(SimpleHistoryAdmin):
     list_display = ('company', 'Student', 'accepted')
     search_fields = ('company',)
     ordering = ('company',)
diff --git a/CDC_Backend/APIs/models.py b/CDC_Backend/APIs/models.py
index b986089..2a74d5f 100644
--- a/CDC_Backend/APIs/models.py
+++ b/CDC_Backend/APIs/models.py
@@ -1,6 +1,7 @@
 from django.contrib.postgres.fields import ArrayField
 from django.db import models
 from django.utils import timezone
+from simple_history.models import HistoricalRecords
 
 from .constants import *
 
@@ -13,6 +14,7 @@ class User(models.Model):
     id = models.CharField(blank=False, max_length=25)
     user_type = ArrayField(models.CharField(blank=False, max_length=10), size=4, default=list, blank=False)
     last_login_time = models.DateTimeField(default=timezone.now)
+    history = HistoricalRecords()
 
     class Meta:
         verbose_name_plural = "User"
@@ -30,6 +32,7 @@ class Student(models.Model):
                          default=list, blank=True)
     cpi = models.DecimalField(decimal_places=2, max_digits=4)
     can_apply = models.BooleanField(default=True, verbose_name='Registered')
+    history = HistoricalRecords()
 
     def __str__(self):
         return str(self.roll_no)
@@ -38,6 +41,7 @@ class Student(models.Model):
 class Admin(models.Model):
     id = models.CharField(blank=False, max_length=15, primary_key=True)
     name = models.CharField(blank=False, max_length=JNF_TEXT_MAX_CHARACTER_COUNT)
+    history = HistoricalRecords()
 
 
 def two_day_after_today():
@@ -114,6 +118,7 @@ class Placement(models.Model):
     deadline_datetime = models.DateTimeField(blank=False, verbose_name="Deadline Date", default=two_day_after_today)
     created_at = models.DateTimeField(blank=False, default=None, null=True)
     updated_at = models.DateTimeField(blank=False, default=None, null=True)
+    history = HistoricalRecords()
 
     def format(self):
         if self.company_name is not None:
@@ -179,6 +184,7 @@ class PlacementApplication(models.Model):
     selected = models.BooleanField(null=True, default=None, blank=True)
     applied_at = models.DateTimeField(blank=False, default=None, null=True)
     updated_at = models.DateTimeField(blank=False, default=None, null=True)
+    history = HistoricalRecords()
 
     def save(self, *args, **kwargs):
         ''' On save, add timestamps '''
@@ -206,3 +212,4 @@ class PrePlacementOffer(models.Model):
     tier = models.CharField(blank=False, choices=TIERS, max_length=10)
     designation = models.CharField(blank=False, max_length=25, default=None, null=True)
     accepted = models.BooleanField(default=None, null=True)
+    history = HistoricalRecords()
diff --git a/CDC_Backend/CDC_Backend/settings.py b/CDC_Backend/CDC_Backend/settings.py
index 4c24f27..22552bf 100644
--- a/CDC_Backend/CDC_Backend/settings.py
+++ b/CDC_Backend/CDC_Backend/settings.py
@@ -29,7 +29,7 @@ SECRET_KEY = 'e_i2g3z!y4+p3dwm%k9k=zmsot@aya-0$mmetgxz4mp#8_oy#*'
 # SECURITY WARNING: don't run with debug turned on in production!
 DEBUG = True
 
-ALLOWED_HOSTS = ['cdc-iitdh.herokuapp.com/', 'localhost', '192.168.29.199']
+ALLOWED_HOSTS = ['cdc-iitdh.herokuapp.com/', 'localhost', '192.168.29.199', '127.0.0.1']
 
 # Application definition
 
@@ -44,7 +44,8 @@ INSTALLED_APPS = [
     'rest_framework',
     'corsheaders',
     'django_db_logger',
-    'background_task'
+    'background_task',
+    'simple_history',
 ]
 
 MIDDLEWARE = [
@@ -57,7 +58,7 @@ MIDDLEWARE = [
     'django.contrib.auth.middleware.AuthenticationMiddleware',
     'django.contrib.messages.middleware.MessageMiddleware',
     'django.middleware.clickjacking.XFrameOptionsMiddleware',
-
+    'simple_history.middleware.HistoryRequestMiddleware',
 ]
 
 ROOT_URLCONF = 'CDC_Backend.urls'