diff --git a/.github/workflows/linting-and-tests.yml b/.github/workflows/linting-and-tests.yml
index ded42414..866a6de2 100644
--- a/.github/workflows/linting-and-tests.yml
+++ b/.github/workflows/linting-and-tests.yml
@@ -283,8 +283,6 @@ jobs:
 
   mypy:
     name: "mypy"
-    # disable until we fix all the pre-existing errors (aka https://github.com/grafana/oncall/issues/2168 is marked as completed)
-    if: ${{ false }}
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v3
diff --git a/engine/apps/alerts/models/alert_receive_channel.py b/engine/apps/alerts/models/alert_receive_channel.py
index 42d6ce0b..8579ddb3 100644
--- a/engine/apps/alerts/models/alert_receive_channel.py
+++ b/engine/apps/alerts/models/alert_receive_channel.py
@@ -41,7 +41,7 @@ from common.public_primary_keys import generate_public_primary_key, increase_pub
 if typing.TYPE_CHECKING:
     from django.db.models.manager import RelatedManager
 
-    from apps.alerts.models import GrafanaAlertingContactPoint
+    from apps.alerts.models import ChannelFilter, GrafanaAlertingContactPoint
 
 logger = logging.getLogger(__name__)
 
@@ -114,6 +114,7 @@ class AlertReceiveChannel(IntegrationOptionsMixin, MaintainableObject):
     Channel generated by user to receive Alerts to.
     """
 
+    channel_filters: "RelatedManager['ChannelFilter']"
     contact_points: "RelatedManager['GrafanaAlertingContactPoint']"
 
     objects = AlertReceiveChannelManager()
diff --git a/engine/apps/alerts/models/custom_button.py b/engine/apps/alerts/models/custom_button.py
index 814f5e0c..626e7f79 100644
--- a/engine/apps/alerts/models/custom_button.py
+++ b/engine/apps/alerts/models/custom_button.py
@@ -1,6 +1,7 @@
 import json
 import logging
 import re
+import typing
 from json import JSONDecodeError
 
 from django.conf import settings
@@ -14,6 +15,12 @@ from common.jinja_templater import apply_jinja_template
 from common.jinja_templater.apply_jinja_template import JinjaTemplateError, JinjaTemplateWarning
 from common.public_primary_keys import generate_public_primary_key, increase_public_primary_key_length
 
+if typing.TYPE_CHECKING:
+    from django.db.models.manager import RelatedManager
+
+    from apps.alerts.models import EscalationPolicy
+
+
 logger = logging.getLogger(__name__)
 logger.setLevel(logging.DEBUG)
 
@@ -46,6 +53,8 @@ class CustomButtonManager(models.Manager):
 
 
 class CustomButton(models.Model):
+    escalation_policies: "RelatedManager['EscalationPolicy']"
+
     objects = CustomButtonManager()
     objects_with_deleted = models.Manager()
 
diff --git a/engine/apps/alerts/models/escalation_chain.py b/engine/apps/alerts/models/escalation_chain.py
index 2dcd7254..1ac04db5 100644
--- a/engine/apps/alerts/models/escalation_chain.py
+++ b/engine/apps/alerts/models/escalation_chain.py
@@ -1,3 +1,5 @@
+import typing
+
 from django.conf import settings
 from django.core.validators import MinLengthValidator
 from django.db import models, transaction
@@ -5,6 +7,11 @@ from django.db import models, transaction
 from apps.alerts.models.escalation_policy import generate_public_primary_key_for_escalation_policy
 from common.public_primary_keys import generate_public_primary_key, increase_public_primary_key_length
 
+if typing.TYPE_CHECKING:
+    from django.db.models.manager import RelatedManager
+
+    from apps.alerts.models import ChannelFilter, EscalationPolicy
+
 
 def generate_public_primary_key_for_escalation_chain():
     prefix = "F"
@@ -21,6 +28,9 @@ def generate_public_primary_key_for_escalation_chain():
 
 
 class EscalationChain(models.Model):
+    channel_filters: "RelatedManager['ChannelFilter']"
+    escalation_policies: "RelatedManager['EscalationPolicy']"
+
     public_primary_key = models.CharField(
         max_length=20,
         validators=[MinLengthValidator(settings.PUBLIC_PRIMARY_KEY_MIN_LENGTH + 1)],
diff --git a/engine/apps/alerts/models/escalation_policy.py b/engine/apps/alerts/models/escalation_policy.py
index 1bd70f37..9c9b1338 100644
--- a/engine/apps/alerts/models/escalation_policy.py
+++ b/engine/apps/alerts/models/escalation_policy.py
@@ -229,7 +229,10 @@ class EscalationPolicy(OrderedModel):
         "alerts.EscalationChain", on_delete=models.CASCADE, related_name="escalation_policies"
     )
 
-    notify_to_users_queue = models.ManyToManyField("user_management.User")
+    notify_to_users_queue = models.ManyToManyField(
+        "user_management.User",
+        related_name="escalation_policy_notify_queues",
+    )
 
     last_notified_user = models.ForeignKey(
         "user_management.User",
@@ -244,6 +247,7 @@ class EscalationPolicy(OrderedModel):
     notify_to_group = models.ForeignKey(
         "slack.SlackUserGroup",
         on_delete=models.SET_NULL,
+        related_name="escalation_policies",
         default=None,
         null=True,
     )
diff --git a/engine/apps/auth_token/models/api_auth_token.py b/engine/apps/auth_token/models/api_auth_token.py
index 531c00be..f3873c20 100644
--- a/engine/apps/auth_token/models/api_auth_token.py
+++ b/engine/apps/auth_token/models/api_auth_token.py
@@ -8,6 +8,8 @@ from apps.user_management.models import Organization, User
 
 
 class ApiAuthToken(BaseAuthToken):
+    objects: models.QuerySet["ApiAuthToken"]
+
     user = models.ForeignKey(to=User, null=False, blank=False, related_name="auth_tokens", on_delete=models.CASCADE)
     organization = models.ForeignKey(
         to=Organization, null=False, blank=False, related_name="auth_tokens", on_delete=models.CASCADE
diff --git a/engine/apps/auth_token/models/plugin_auth_token.py b/engine/apps/auth_token/models/plugin_auth_token.py
index 56a33068..fce2d1bc 100644
--- a/engine/apps/auth_token/models/plugin_auth_token.py
+++ b/engine/apps/auth_token/models/plugin_auth_token.py
@@ -16,8 +16,14 @@ from apps.user_management.models import Organization
 
 
 class PluginAuthToken(BaseAuthToken):
+    objects: models.Manager["PluginAuthToken"]
+
     salt = models.CharField(max_length=constants.AUTH_TOKEN_CHARACTER_LENGTH, null=True)
-    organization = models.ForeignKey(to=Organization, on_delete=models.CASCADE)
+    organization = models.ForeignKey(
+        to=Organization,
+        on_delete=models.CASCADE,
+        related_name="plugin_auth_tokens",
+    )
 
     @classmethod
     def create_auth_token(cls, organization: Organization) -> Tuple["PluginAuthToken", str]:
diff --git a/engine/apps/auth_token/models/schedule_export_auth_token.py b/engine/apps/auth_token/models/schedule_export_auth_token.py
index ffae910f..fa1462a2 100644
--- a/engine/apps/auth_token/models/schedule_export_auth_token.py
+++ b/engine/apps/auth_token/models/schedule_export_auth_token.py
@@ -9,6 +9,8 @@ from apps.user_management.models import Organization, User
 
 
 class ScheduleExportAuthToken(BaseAuthToken):
+    objects: models.Manager["ScheduleExportAuthToken"]
+
     class Meta:
         unique_together = ("user", "organization", "schedule")
 
diff --git a/engine/apps/auth_token/models/user_schedule_export_auth_token.py b/engine/apps/auth_token/models/user_schedule_export_auth_token.py
index 94186408..f27992d6 100644
--- a/engine/apps/auth_token/models/user_schedule_export_auth_token.py
+++ b/engine/apps/auth_token/models/user_schedule_export_auth_token.py
@@ -8,6 +8,8 @@ from apps.user_management.models import Organization, User
 
 
 class UserScheduleExportAuthToken(BaseAuthToken):
+    objects: models.Manager["UserScheduleExportAuthToken"]
+
     class Meta:
         unique_together = ("user", "organization")
 
diff --git a/engine/apps/mobile_app/models.py b/engine/apps/mobile_app/models.py
index 7d45692e..aa94b435 100644
--- a/engine/apps/mobile_app/models.py
+++ b/engine/apps/mobile_app/models.py
@@ -52,6 +52,8 @@ class MobileAppVerificationToken(BaseAuthToken):
 
 
 class MobileAppAuthToken(BaseAuthToken):
+    objects: models.Manager["MobileAppAuthToken"]
+
     user = models.OneToOneField(to=User, null=False, blank=False, on_delete=models.CASCADE)
     organization = models.ForeignKey(
         to=Organization, null=False, blank=False, related_name="mobile_app_auth_tokens", on_delete=models.CASCADE
diff --git a/engine/apps/schedules/models/custom_on_call_shift.py b/engine/apps/schedules/models/custom_on_call_shift.py
index 24562c33..d4e2af67 100644
--- a/engine/apps/schedules/models/custom_on_call_shift.py
+++ b/engine/apps/schedules/models/custom_on_call_shift.py
@@ -2,6 +2,7 @@ import copy
 import datetime
 import itertools
 import logging
+import typing
 from calendar import monthrange
 from uuid import uuid4
 
@@ -27,6 +28,12 @@ from apps.schedules.tasks import (
 from apps.user_management.models import User
 from common.public_primary_keys import generate_public_primary_key, increase_public_primary_key_length
 
+if typing.TYPE_CHECKING:
+    from django.db.models.manager import RelatedManager
+
+    from apps.schedules.models import OnCallSchedule
+
+
 logger = logging.getLogger(__name__)
 logger.setLevel(logging.DEBUG)
 
@@ -46,6 +53,8 @@ def generate_public_primary_key_for_custom_oncall_shift():
 
 
 class CustomOnCallShift(models.Model):
+    schedules: "RelatedManager['OnCallSchedule']"
+
     (
         FREQUENCY_DAILY,
         FREQUENCY_WEEKLY,
diff --git a/engine/apps/schedules/models/on_call_schedule.py b/engine/apps/schedules/models/on_call_schedule.py
index f759811f..eefc6c47 100644
--- a/engine/apps/schedules/models/on_call_schedule.py
+++ b/engine/apps/schedules/models/on_call_schedule.py
@@ -46,6 +46,13 @@ from apps.user_management.models import User
 from common.database import NON_POLYMORPHIC_CASCADE, NON_POLYMORPHIC_SET_NULL
 from common.public_primary_keys import generate_public_primary_key, increase_public_primary_key_length
 
+if typing.TYPE_CHECKING:
+    from django.db.models.manager import RelatedManager
+
+    from apps.alerts.models import EscalationPolicy
+    from apps.auth_token.models import ScheduleExportAuthToken
+
+
 RE_ICAL_SEARCH_USERNAME = r"SUMMARY:(\[L[0-9]+\] )?{}"
 RE_ICAL_FETCH_USERNAME = re.compile(r"SUMMARY:(?:\[L[0-9]+\] )?(\w+)")
 
@@ -836,6 +843,10 @@ class OnCallSchedule(PolymorphicModel):
 
 
 class OnCallScheduleICal(OnCallSchedule):
+    escalation_policies: "RelatedManager['EscalationPolicy']"
+    objects: models.Manager["OnCallScheduleICal"]
+    schedule_export_token: "RelatedManager['ScheduleExportAuthToken']"
+
     # For the ical schedule both primary and overrides icals are imported via ical url
     ical_url_primary = models.CharField(max_length=500, null=True, default=None)
     ical_file_error_primary = models.CharField(max_length=200, null=True, default=None)
@@ -901,6 +912,10 @@ class OnCallScheduleICal(OnCallSchedule):
 
 
 class OnCallScheduleCalendar(OnCallSchedule):
+    escalation_policies: "RelatedManager['EscalationPolicy']"
+    objects: models.Manager["OnCallScheduleCalendar"]
+    schedule_export_token: "RelatedManager['ScheduleExportAuthToken']"
+
     # For the calendar schedule only overrides ical is imported via ical url.
     ical_url_overrides = models.CharField(max_length=500, null=True, default=None)
     ical_file_error_overrides = models.CharField(max_length=200, null=True, default=None)
@@ -994,6 +1009,10 @@ class OnCallScheduleCalendar(OnCallSchedule):
 
 
 class OnCallScheduleWeb(OnCallSchedule):
+    escalation_policies: "RelatedManager['EscalationPolicy']"
+    objects: models.Manager["OnCallScheduleWeb"]
+    schedule_export_token: "RelatedManager['ScheduleExportAuthToken']"
+
     time_zone = models.CharField(max_length=100, default="UTC")
 
     def _generate_ical_file_primary(self):
diff --git a/engine/apps/slack/models/slack_usergroup.py b/engine/apps/slack/models/slack_usergroup.py
index 6d7fa708..fcafedd9 100644
--- a/engine/apps/slack/models/slack_usergroup.py
+++ b/engine/apps/slack/models/slack_usergroup.py
@@ -1,4 +1,5 @@
 import logging
+import typing
 
 import requests
 from django.conf import settings
@@ -13,6 +14,13 @@ from apps.slack.slack_client.exceptions import SlackAPIException
 from apps.user_management.models.user import User
 from common.public_primary_keys import generate_public_primary_key, increase_public_primary_key_length
 
+if typing.TYPE_CHECKING:
+    from django.db.models.manager import RelatedManager
+
+    from apps.alerts.models import EscalationPolicy
+    from apps.schedules.models import OnCallSchedule
+
+
 logger = logging.getLogger(__name__)
 
 
@@ -31,6 +39,9 @@ def generate_public_primary_key_for_slack_user_group():
 
 
 class SlackUserGroup(models.Model):
+    escalation_policies: "RelatedManager['EscalationPolicy']"
+    oncall_schedules: "RelatedManager['OnCallSchedule']"
+
     public_primary_key = models.CharField(
         max_length=20,
         validators=[MinLengthValidator(settings.PUBLIC_PRIMARY_KEY_MIN_LENGTH + 1)],
diff --git a/engine/apps/telegram/models/connectors/channel.py b/engine/apps/telegram/models/connectors/channel.py
index fc3c7794..49168808 100644
--- a/engine/apps/telegram/models/connectors/channel.py
+++ b/engine/apps/telegram/models/connectors/channel.py
@@ -1,5 +1,5 @@
 import logging
-from typing import Optional
+import typing
 
 from django.conf import settings
 from django.core.validators import MinLengthValidator
@@ -13,6 +13,12 @@ from apps.telegram.models import TelegramMessage
 from common.insight_log.chatops_insight_logs import ChatOpsEvent, ChatOpsTypePlug, write_chatops_insight_log
 from common.public_primary_keys import generate_public_primary_key, increase_public_primary_key_length
 
+if typing.TYPE_CHECKING:
+    from django.db.models.manager import RelatedManager
+
+    from apps.alerts.models import ChannelFilter
+
+
 logger = logging.getLogger(__name__)
 
 
@@ -31,6 +37,8 @@ def generate_public_primary_key_for_telegram_to_at_connector() -> str:
 
 
 class TelegramToOrganizationConnector(models.Model):
+    channel_filter: "RelatedManager['ChannelFilter']"
+
     public_primary_key = models.CharField(
         max_length=20,
         validators=[MinLengthValidator(settings.PUBLIC_PRIMARY_KEY_MIN_LENGTH + 1)],
@@ -60,7 +68,7 @@ class TelegramToOrganizationConnector(models.Model):
         return self.channel_chat_id is not None and self.discussion_group_chat_id is not None
 
     @classmethod
-    def get_channel_for_alert_group(cls, alert_group: AlertGroup) -> Optional["TelegramToOrganizationConnector"]:
+    def get_channel_for_alert_group(cls, alert_group: AlertGroup) -> typing.Optional["TelegramToOrganizationConnector"]:
         # TODO: add custom queryset
         dm_messages_exist = alert_group.telegram_messages.filter(
             ~Q(chat_id__startswith="-")
diff --git a/engine/apps/user_management/models/organization.py b/engine/apps/user_management/models/organization.py
index 749d5a5d..0afbbd1c 100644
--- a/engine/apps/user_management/models/organization.py
+++ b/engine/apps/user_management/models/organization.py
@@ -21,6 +21,13 @@ from common.public_primary_keys import generate_public_primary_key, increase_pub
 if typing.TYPE_CHECKING:
     from django.db.models.manager import RelatedManager
 
+    from apps.auth_token.models import (
+        ApiAuthToken,
+        PluginAuthToken,
+        ScheduleExportAuthToken,
+        UserScheduleExportAuthToken,
+    )
+    from apps.mobile_app.models import MobileAppAuthToken
     from apps.schedules.models import OnCallSchedule
     from apps.user_management.models import User
 
@@ -69,8 +76,13 @@ class OrganizationManager(models.Manager):
 
 
 class Organization(MaintainableObject):
-    users: "RelatedManager['User']"
+    auth_tokens: "RelatedManager['ApiAuthToken']"
+    mobile_app_auth_tokens: "RelatedManager['MobileAppAuthToken']"
     oncall_schedules: "RelatedManager['OnCallSchedule']"
+    plugin_auth_tokens: "RelatedManager['PluginAuthToken']"
+    schedule_export_token: "RelatedManager['ScheduleExportAuthToken']"
+    user_schedule_export_token: "RelatedManager['UserScheduleExportAuthToken']"
+    users: "RelatedManager['User']"
 
     objects = OrganizationManager()
     objects_with_deleted = models.Manager()
diff --git a/engine/apps/user_management/models/team.py b/engine/apps/user_management/models/team.py
index 769c5baa..3393bfdc 100644
--- a/engine/apps/user_management/models/team.py
+++ b/engine/apps/user_management/models/team.py
@@ -1,3 +1,5 @@
+import typing
+
 from django.conf import settings
 from django.core.validators import MinLengthValidator
 from django.db import models
@@ -6,6 +8,11 @@ from apps.metrics_exporter.helpers import metrics_bulk_update_team_label_cache
 from apps.metrics_exporter.metrics_cache_manager import MetricsCacheManager
 from common.public_primary_keys import generate_public_primary_key, increase_public_primary_key_length
 
+if typing.TYPE_CHECKING:
+    from django.db.models.manager import RelatedManager
+
+    from apps.alerts.models import AlertGroupLogRecord
+
 
 def generate_public_primary_key_for_team():
     prefix = "T"
@@ -76,6 +83,8 @@ class TeamManager(models.Manager):
 
 
 class Team(models.Model):
+    oncall_schedules: "RelatedManager['AlertGroupLogRecord']"
+
     public_primary_key = models.CharField(
         max_length=20,
         validators=[MinLengthValidator(settings.PUBLIC_PRIMARY_KEY_MIN_LENGTH + 1)],
diff --git a/engine/apps/user_management/models/user.py b/engine/apps/user_management/models/user.py
index 778291dd..931f1bcb 100644
--- a/engine/apps/user_management/models/user.py
+++ b/engine/apps/user_management/models/user.py
@@ -21,6 +21,12 @@ from apps.api.permissions import (
 from apps.schedules.tasks import drop_cached_ical_for_custom_events_for_organization
 from common.public_primary_keys import generate_public_primary_key, increase_public_primary_key_length
 
+if typing.TYPE_CHECKING:
+    from django.db.models.manager import RelatedManager
+
+    from apps.alerts.models import EscalationPolicy
+    from apps.auth_token.models import ApiAuthToken, ScheduleExportAuthToken, UserScheduleExportAuthToken
+
 logger = logging.getLogger(__name__)
 
 
@@ -137,6 +143,12 @@ class UserQuerySet(models.QuerySet):
 
 
 class User(models.Model):
+    auth_tokens: "RelatedManager['ApiAuthToken']"
+    escalation_policy_notify_queues: "RelatedManager['EscalationPolicy']"
+    last_notified_in_escalation_policies: "RelatedManager['EscalationPolicy']"
+    schedule_export_token: "RelatedManager['ScheduleExportAuthToken']"
+    user_schedule_export_token: "RelatedManager['UserScheduleExportAuthToken']"
+
     objects = UserManager.from_queryset(UserQuerySet)()
 
     class Meta:
diff --git a/engine/apps/webhooks/models/webhook.py b/engine/apps/webhooks/models/webhook.py
index 97036576..d9992a5e 100644
--- a/engine/apps/webhooks/models/webhook.py
+++ b/engine/apps/webhooks/models/webhook.py
@@ -1,4 +1,5 @@
 import json
+import typing
 from json import JSONDecodeError
 
 import requests
@@ -23,6 +24,11 @@ from common.jinja_templater import apply_jinja_template
 from common.jinja_templater.apply_jinja_template import JinjaTemplateError, JinjaTemplateWarning
 from common.public_primary_keys import generate_public_primary_key, increase_public_primary_key_length
 
+if typing.TYPE_CHECKING:
+    from django.db.models.manager import RelatedManager
+
+    from apps.alerts.models import EscalationPolicy
+
 WEBHOOK_FIELD_PLACEHOLDER = "****************"
 
 
@@ -54,6 +60,8 @@ class WebhookManager(models.Manager):
 
 
 class Webhook(models.Model):
+    escalation_policies: "RelatedManager['EscalationPolicy']"
+
     objects = WebhookManager()
     objects_with_deleted = models.Manager()
 
diff --git a/engine/pyproject.toml b/engine/pyproject.toml
index 12c0cabd..a3acaeca 100644
--- a/engine/pyproject.toml
+++ b/engine/pyproject.toml
@@ -23,6 +23,28 @@ exclude = [
     "tests/test_.*\\.py$",    # test files
     "migrations/\\d*.*\\.py",  # migration files
 ]
+disable_error_code = [
+    "abstract",
+    "annotation-unchecked",
+    "arg-type",
+    "assignment",
+    "attr-defined",
+    "call-arg",
+    "call-overload",
+    "has-type",
+    "import",
+    "index",
+    "misc",
+    "name-defined",
+    "no-redef",
+    "operator",
+    "return",
+    "return-value",
+    "typeddict-item",
+    "union-attr",
+    "valid-type",
+    "var-annotated",
+]
 
 # mypy per-module options
 [[tool.mypy.overrides]]
diff --git a/engine/requirements-dev.txt b/engine/requirements-dev.txt
index 112438d9..4c9577a7 100644
--- a/engine/requirements-dev.txt
+++ b/engine/requirements-dev.txt
@@ -1,8 +1,8 @@
 celery-types==0.18.0
 django-filter-stubs==0.1.3
-django-stubs[compatible-mypy]==4.2.1
-djangorestframework-stubs[compatible-mypy]==3.14.1
-mypy==1.3.0
+django-stubs[compatible-mypy]==4.2.2
+djangorestframework-stubs[compatible-mypy]==3.14.2
+mypy==1.4.1
 pre-commit==2.15.0
 pytest==7.3.1
 pytest-django==4.5.2