diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index bb574046..29f34083 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -23,6 +23,9 @@ jobs:
           cd grafana-plugin/
           yarn --network-timeout 500000
           yarn build
+      # pre-commit uses git, which is not working in the action without this workaround
+      # see https://github.com/actions/runner-images/issues/6775
+      - run: git config --global --add safe.directory "$GITHUB_WORKSPACE"
       - name: Lint All
         run: |
           pre-commit run --all-files
@@ -55,6 +58,32 @@ jobs:
         run: |
           docker run -v ${PWD}/docs/sources:/hugo/content/docs/oncall/latest -e HUGO_REFLINKSERRORLEVEL=ERROR --rm grafana/docs-base:latest /bin/bash -c 'make hugo'
 
+  lint-migrations-backend-mysql-rabbitmq:
+    name: "Lint migrations"
+    runs-on: ubuntu-latest
+    container: python:3.9
+    env:
+      DJANGO_SETTINGS_MODULE: settings.ci-test
+      SLACK_CLIENT_OAUTH_ID: 1
+    services:
+      rabbit_test:
+        image: rabbitmq:3.7.19
+        env:
+          RABBITMQ_DEFAULT_USER: rabbitmq
+          RABBITMQ_DEFAULT_PASS: rabbitmq
+      mysql_test:
+        image: mysql:5.7.25
+        env:
+          MYSQL_DATABASE: oncall_local_dev
+          MYSQL_ROOT_PASSWORD: local_dev_pwd
+    steps:
+      - uses: actions/checkout@v3
+      - name: Lint migrations
+        run: |
+          cd engine/
+          pip install -r requirements.txt
+          python manage.py lintmigrations
+
   unit-test-backend-mysql-rabbitmq:
     name: "Backend Tests: MySQL + RabbitMQ (RBAC enabled: ${{ matrix.rbac_enabled }})"
     runs-on: ubuntu-latest
diff --git a/CHANGELOG.md b/CHANGELOG.md
index cce7d1ee..0c5940d9 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,12 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## v1.1.23 (2023-02-06)
+
+### Fixed
+
+- Fix bug with email case sensitivity for ICal on-call schedules ([1297](https://github.com/grafana/oncall/pull/1297))
+
 ## v1.1.22 (2023-02-03)
 
 ### Fixed
diff --git a/dev/README.md b/dev/README.md
index bd88dabf..15b3fd9c 100644
--- a/dev/README.md
+++ b/dev/README.md
@@ -20,6 +20,7 @@
   - [symbol not found in flat namespace '\_EVP_DigestSignUpdate'](#symbol-not-found-in-flat-namespace-_evp_digestsignupdate)
 - [IDE Specific Instructions](#ide-specific-instructions)
   - [PyCharm](#pycharm)
+- [How to write database migrations](#how-to-write-database-migrations)
 
 Related: [How to develop integrations](/engine/config_integrations/README.md)
 
@@ -397,3 +398,15 @@ make run-backend-celery
 5. Create a new Django Server run configuration to Run/Debug the engine
    - Use a plugin such as EnvFile to load the .env.dev file
    - Change port from 8000 to 8080
+
+## How to write database migrations
+
+We use [django-migration-linter](https://github.com/3YOURMIND/django-migration-linter) to keep database migrations
+backwards compatible
+
+- we can automatically run migrations and they are zero-downtime, e.g. old code can work with the migrated database
+- we can run and rollback migrations without worrying about data safety
+- OnCall is deployed to the multiple environments core team is not able to control
+
+See [django-migration-linter checklist](https://github.com/3YOURMIND/django-migration-linter/blob/main/docs/incompatibilities.md)
+for the common mistakes and best practices
diff --git a/docs/sources/integrations/chatops-integrations/configure-slack/index.md b/docs/sources/integrations/chatops-integrations/configure-slack/index.md
index e9595ba6..7e00d3db 100644
--- a/docs/sources/integrations/chatops-integrations/configure-slack/index.md
+++ b/docs/sources/integrations/chatops-integrations/configure-slack/index.md
@@ -88,12 +88,19 @@ The Grafana OnCall Slack app includes helpful message shortcuts and slash comman
 
 ### Slack commands
 
-Use the `/oncall` Slack command to create a new alert group directly from Slack.
+Use the `/oncall` Slack command to create a new alert group directly from Slack targetting a team and/or route.
 
 1. Type `/oncall` in the message box of the desired Slack channel then click **Send**.
 1. Fill out the **Start New Escalation** creation form then click **Submit**.
 1. Once the Grafana OnCall app sends a Slack message with the newly created alert, the alert group is open and firing.
 
+Use the `/escalate` Slack command to create a new alert group directly from Slack and specifically paging a user or
+a schedule.
+
+1. Type `/escalate` in the message box of any Slack channel then click **Send**.
+1. Fill out the **Create alert group** form then click **Submit**.
+1. Once the Grafana OnCall app sends a Slack message with the newly created alert, the alert group is open and firing.
+
 ### Message shortcuts
 
 Use message shortcuts to add resolution notes directly from Slack. Message shortcuts are available in the More actions menu from any message.
diff --git a/docs/sources/open-source/_index.md b/docs/sources/open-source/_index.md
index aad2c29c..f5f541ea 100644
--- a/docs/sources/open-source/_index.md
+++ b/docs/sources/open-source/_index.md
@@ -96,7 +96,11 @@ features:
   slash_commands:
     - command: /oncall
       url: <ONCALL_ENGINE_PUBLIC_URL>/slack/interactive_api_endpoint/
-      description: oncall
+      description: Create a manual alert group
+      should_escape: false
+    - command: /escalate
+      url: <ONCALL_ENGINE_PUBLIC_URL>/slack/interactive_api_endpoint/
+      description: Direct page user(s) or schedule(s)
       should_escape: false
 oauth_config:
   redirect_urls:
diff --git a/engine/apps/alerts/migrations/0001_squashed_initial.py b/engine/apps/alerts/migrations/0001_squashed_initial.py
index bc66bc5c..0c96d7d4 100644
--- a/engine/apps/alerts/migrations/0001_squashed_initial.py
+++ b/engine/apps/alerts/migrations/0001_squashed_initial.py
@@ -15,6 +15,7 @@ import django.core.validators
 from django.db import migrations, models
 import django.db.models.deletion
 import django.db.models.manager
+import django_migration_linter as linter
 
 from apps.alerts.integration_options_mixin import IntegrationOptionsMixin
 
@@ -27,6 +28,7 @@ class Migration(migrations.Migration):
     ]
 
     operations = [
+        linter.IgnoreMigration(),
         migrations.CreateModel(
             name='Alert',
             fields=[
diff --git a/engine/apps/alerts/migrations/0002_squashed_initial.py b/engine/apps/alerts/migrations/0002_squashed_initial.py
index bd0b33dc..765e8bfa 100644
--- a/engine/apps/alerts/migrations/0002_squashed_initial.py
+++ b/engine/apps/alerts/migrations/0002_squashed_initial.py
@@ -3,6 +3,7 @@
 from django.db import migrations, models
 import django.db.models.deletion
 import django.db.models.manager
+import django_migration_linter as linter
 
 
 class Migration(migrations.Migration):
@@ -18,6 +19,7 @@ class Migration(migrations.Migration):
     ]
 
     operations = [
+        linter.IgnoreMigration(),
         migrations.AddField(
             model_name='userhasnotification',
             name='user',
diff --git a/engine/apps/alerts/migrations/0003_grafanaalertingcontactpoint_datasource_uid.py b/engine/apps/alerts/migrations/0003_grafanaalertingcontactpoint_datasource_uid.py
index 4bdcec63..2962923a 100644
--- a/engine/apps/alerts/migrations/0003_grafanaalertingcontactpoint_datasource_uid.py
+++ b/engine/apps/alerts/migrations/0003_grafanaalertingcontactpoint_datasource_uid.py
@@ -1,6 +1,7 @@
 # Generated by Django 3.2.13 on 2022-06-14 15:18
 
 from django.db import migrations, models
+import django_migration_linter as linter
 
 
 class Migration(migrations.Migration):
@@ -10,6 +11,7 @@ class Migration(migrations.Migration):
     ]
 
     operations = [
+        linter.IgnoreMigration(),
         migrations.AddField(
             model_name='grafanaalertingcontactpoint',
             name='datasource_uid',
diff --git a/engine/apps/alerts/migrations/0004_auto_20220711_1106.py b/engine/apps/alerts/migrations/0004_auto_20220711_1106.py
index ddae2447..6e0396b8 100644
--- a/engine/apps/alerts/migrations/0004_auto_20220711_1106.py
+++ b/engine/apps/alerts/migrations/0004_auto_20220711_1106.py
@@ -1,6 +1,7 @@
 # Generated by Django 3.2.13 on 2022-07-11 11:06
 
 from django.db import migrations
+import django_migration_linter as linter
 
 
 class Migration(migrations.Migration):
@@ -17,6 +18,7 @@ class Migration(migrations.Migration):
     ]
 
     operations = [
+        linter.IgnoreMigration(),
         # migrations.RemoveField(
         #     model_name='alertgroup',
         #     name='active_cache_for_web_calculation_id',
diff --git a/engine/apps/alerts/migrations/0005_alertgroup_cached_render_for_web.py b/engine/apps/alerts/migrations/0005_alertgroup_cached_render_for_web.py
index cff73da3..7717a56a 100644
--- a/engine/apps/alerts/migrations/0005_alertgroup_cached_render_for_web.py
+++ b/engine/apps/alerts/migrations/0005_alertgroup_cached_render_for_web.py
@@ -1,6 +1,7 @@
 # Generated by Django 3.2.13 on 2022-07-20 09:04
 
 from django.db import migrations, models, OperationalError, ProgrammingError
+import django_migration_linter as linter
 
 
 class AddFieldIfNotExists(migrations.AddField):
@@ -36,6 +37,7 @@ class Migration(migrations.Migration):
     ]
 
     operations = [
+        linter.IgnoreMigration(),
         AddFieldIfNotExists(
             model_name='alertgroup',
             name='cached_render_for_web',
diff --git a/engine/apps/alerts/migrations/0006_alertgroup_alerts_aler_channel_ee84a7_idx.py b/engine/apps/alerts/migrations/0006_alertgroup_alerts_aler_channel_ee84a7_idx.py
index ada7b0da..d3ec42ab 100644
--- a/engine/apps/alerts/migrations/0006_alertgroup_alerts_aler_channel_ee84a7_idx.py
+++ b/engine/apps/alerts/migrations/0006_alertgroup_alerts_aler_channel_ee84a7_idx.py
@@ -1,6 +1,7 @@
 # Generated by Django 3.2.13 on 2022-07-27 10:51
 
 from django.db import migrations, models
+import django_migration_linter as linter
 
 
 class Migration(migrations.Migration):
@@ -10,6 +11,7 @@ class Migration(migrations.Migration):
     ]
 
     operations = [
+        linter.IgnoreMigration(),
         migrations.AddIndex(
             model_name='alertgroup',
             index=models.Index(fields=['channel_id', 'resolved', 'acknowledged', 'silenced', 'root_alert_group_id', 'is_archived'], name='alerts_aler_channel_ee84a7_idx'),
diff --git a/engine/apps/alerts/migrations/0007_populate_web_title_cache.py b/engine/apps/alerts/migrations/0007_populate_web_title_cache.py
index 9869a9da..09ada136 100644
--- a/engine/apps/alerts/migrations/0007_populate_web_title_cache.py
+++ b/engine/apps/alerts/migrations/0007_populate_web_title_cache.py
@@ -4,6 +4,7 @@ from django.db import migrations
 
 from apps.alerts.models import AlertReceiveChannel
 from apps.alerts.tasks import update_web_title_cache_for_alert_receive_channel
+import django_migration_linter as linter
 
 
 def populate_web_title_cache(apps, _):
@@ -19,6 +20,7 @@ class Migration(migrations.Migration):
     ]
 
     operations = [
+        linter.IgnoreMigration(),
         migrations.RenameField(
             model_name='alertgroup',
             old_name='verbose_name',
diff --git a/engine/apps/alerts/migrations/0008_alter_alertgrouplogrecord_type.py b/engine/apps/alerts/migrations/0008_alter_alertgrouplogrecord_type.py
index f805f599..08ea965c 100644
--- a/engine/apps/alerts/migrations/0008_alter_alertgrouplogrecord_type.py
+++ b/engine/apps/alerts/migrations/0008_alter_alertgrouplogrecord_type.py
@@ -1,6 +1,7 @@
 # Generated by Django 3.2.16 on 2023-01-19 18:06
 
 from django.db import migrations, models
+import django_migration_linter as linter
 
 
 class Migration(migrations.Migration):
@@ -10,6 +11,7 @@ class Migration(migrations.Migration):
     ]
 
     operations = [
+        linter.IgnoreMigration(),
         migrations.AlterField(
             model_name='alertgrouplogrecord',
             name='type',
diff --git a/engine/apps/api_for_grafana_incident/serializers.py b/engine/apps/api_for_grafana_incident/serializers.py
index c6668933..5b6cf049 100644
--- a/engine/apps/api_for_grafana_incident/serializers.py
+++ b/engine/apps/api_for_grafana_incident/serializers.py
@@ -2,17 +2,30 @@ import logging
 
 from rest_framework import serializers
 
-from apps.alerts.models import AlertGroup
-from common.api_helpers.mixins import EagerLoadingMixin
+from apps.alerts.models import Alert, AlertGroup
 
 logger = logging.getLogger(__name__)
 
 
-class AlertGroupSerializer(EagerLoadingMixin, serializers.ModelSerializer):
+class AlertSerializer(serializers.ModelSerializer):
 
     id_oncall = serializers.CharField(read_only=True, source="public_primary_key")
+    payload = serializers.JSONField(read_only=True, source="raw_request_data")
+
+    class Meta:
+        model = Alert
+        fields = [
+            "id_oncall",
+            "payload",
+        ]
+
+
+class AlertGroupSerializer(serializers.ModelSerializer):
+
+    id = serializers.CharField(read_only=True, source="public_primary_key")
     status = serializers.SerializerMethodField(source="get_status")
     link = serializers.CharField(read_only=True, source="web_link")
+    alerts = AlertSerializer(many=True, read_only=True)
 
     def get_status(self, obj):
         return next(filter(lambda status: status[0] == obj.status, AlertGroup.STATUS_CHOICES))[1].lower()
@@ -20,7 +33,8 @@ class AlertGroupSerializer(EagerLoadingMixin, serializers.ModelSerializer):
     class Meta:
         model = AlertGroup
         fields = [
-            "id_oncall",
+            "id",
             "link",
             "status",
+            "alerts",
         ]
diff --git a/engine/apps/auth_token/migrations/0001_squashed_initial.py b/engine/apps/auth_token/migrations/0001_squashed_initial.py
index 7c7fe23a..b816d815 100644
--- a/engine/apps/auth_token/migrations/0001_squashed_initial.py
+++ b/engine/apps/auth_token/migrations/0001_squashed_initial.py
@@ -3,6 +3,7 @@ from django.utils import timezone
 
 import apps.auth_token.models.slack_auth_token
 from django.db import migrations, models
+import django_migration_linter as linter
 
 
 class Migration(migrations.Migration):
@@ -13,6 +14,7 @@ class Migration(migrations.Migration):
     ]
 
     operations = [
+        linter.IgnoreMigration(),
         migrations.CreateModel(
             name='ApiAuthToken',
             fields=[
diff --git a/engine/apps/auth_token/migrations/0002_squashed_initial.py b/engine/apps/auth_token/migrations/0002_squashed_initial.py
index e35e5ce2..8141df51 100644
--- a/engine/apps/auth_token/migrations/0002_squashed_initial.py
+++ b/engine/apps/auth_token/migrations/0002_squashed_initial.py
@@ -2,6 +2,7 @@
 
 from django.db import migrations, models
 import django.db.models.deletion
+import django_migration_linter as linter
 
 
 class Migration(migrations.Migration):
@@ -15,6 +16,7 @@ class Migration(migrations.Migration):
     ]
 
     operations = [
+        linter.IgnoreMigration(),
         migrations.AddField(
             model_name='userscheduleexportauthtoken',
             name='organization',
diff --git a/engine/apps/auth_token/migrations/0003_auto_20221121_1610.py b/engine/apps/auth_token/migrations/0003_auto_20221121_1610.py
index 08406946..df003a55 100644
--- a/engine/apps/auth_token/migrations/0003_auto_20221121_1610.py
+++ b/engine/apps/auth_token/migrations/0003_auto_20221121_1610.py
@@ -1,6 +1,7 @@
 # Generated by Django 3.2.16 on 2022-11-21 16:10
 
 from django.db import migrations
+import django_migration_linter as linter
 
 
 class Migration(migrations.Migration):
@@ -10,6 +11,7 @@ class Migration(migrations.Migration):
     ]
 
     operations = [
+        linter.IgnoreMigration(),
         migrations.RemoveField(
             model_name='mobileappverificationtoken',
             name='organization',
diff --git a/engine/apps/base/migrations/0001_squashed_initial.py b/engine/apps/base/migrations/0001_squashed_initial.py
index 0055fa88..ee0572ef 100644
--- a/engine/apps/base/migrations/0001_squashed_initial.py
+++ b/engine/apps/base/migrations/0001_squashed_initial.py
@@ -6,6 +6,7 @@ import datetime
 import django.core.validators
 from django.db import migrations, models
 import django.db.models.deletion
+import django_migration_linter as linter
 
 
 class Migration(migrations.Migration):
@@ -17,6 +18,7 @@ class Migration(migrations.Migration):
     ]
 
     operations = [
+        linter.IgnoreMigration(),
         migrations.CreateModel(
             name='DynamicSetting',
             fields=[
diff --git a/engine/apps/base/migrations/0002_squashed_initial.py b/engine/apps/base/migrations/0002_squashed_initial.py
index 9bf98adb..18cb6bcc 100644
--- a/engine/apps/base/migrations/0002_squashed_initial.py
+++ b/engine/apps/base/migrations/0002_squashed_initial.py
@@ -2,6 +2,7 @@
 
 from django.db import migrations, models
 import django.db.models.deletion
+import django_migration_linter as linter
 
 
 class Migration(migrations.Migration):
@@ -14,6 +15,7 @@ class Migration(migrations.Migration):
     ]
 
     operations = [
+        linter.IgnoreMigration(),
         migrations.AddField(
             model_name='usernotificationpolicylogrecord',
             name='author',
diff --git a/engine/apps/base/migrations/0003_delete_organizationlogrecord.py b/engine/apps/base/migrations/0003_delete_organizationlogrecord.py
index b0a49a1a..c5515881 100644
--- a/engine/apps/base/migrations/0003_delete_organizationlogrecord.py
+++ b/engine/apps/base/migrations/0003_delete_organizationlogrecord.py
@@ -1,6 +1,7 @@
 # Generated by Django 3.2.5 on 2022-08-23 12:03
 
 from django.db import migrations
+import django_migration_linter as linter
 
 
 class Migration(migrations.Migration):
@@ -10,6 +11,7 @@ class Migration(migrations.Migration):
     ]
 
     operations = [
+        linter.IgnoreMigration(),
         migrations.DeleteModel(
             name='OrganizationLogRecord',
         ),
diff --git a/engine/apps/email/migrations/0001_initial.py b/engine/apps/email/migrations/0001_initial.py
index 3fe9537a..8b5a7e94 100644
--- a/engine/apps/email/migrations/0001_initial.py
+++ b/engine/apps/email/migrations/0001_initial.py
@@ -3,6 +3,7 @@
 from django.db import migrations, models
 import django.db.models.deletion
 import uuid
+import django_migration_linter as linter
 
 
 class Migration(migrations.Migration):
@@ -16,6 +17,7 @@ class Migration(migrations.Migration):
     ]
 
     operations = [
+        linter.IgnoreMigration(),
         migrations.CreateModel(
             name='EmailMessage',
             fields=[
diff --git a/engine/apps/heartbeat/migrations/0001_squashed_initial.py b/engine/apps/heartbeat/migrations/0001_squashed_initial.py
index a30b29e7..687c9a3c 100644
--- a/engine/apps/heartbeat/migrations/0001_squashed_initial.py
+++ b/engine/apps/heartbeat/migrations/0001_squashed_initial.py
@@ -4,6 +4,7 @@ import apps.heartbeat.models
 import django.core.validators
 from django.db import migrations, models
 import django.db.models.deletion
+import django_migration_linter as linter
 
 
 class Migration(migrations.Migration):
@@ -15,6 +16,7 @@ class Migration(migrations.Migration):
     ]
 
     operations = [
+        linter.IgnoreMigration(),
         migrations.CreateModel(
             name='IntegrationHeartBeat',
             fields=[
diff --git a/engine/apps/mobile_app/migrations/0001_initial.py b/engine/apps/mobile_app/migrations/0001_initial.py
index de3faf32..a52c649c 100644
--- a/engine/apps/mobile_app/migrations/0001_initial.py
+++ b/engine/apps/mobile_app/migrations/0001_initial.py
@@ -3,6 +3,7 @@
 import apps.mobile_app.models
 from django.db import migrations, models
 import django.db.models.deletion
+import django_migration_linter as linter
 
 
 class Migration(migrations.Migration):
@@ -15,6 +16,7 @@ class Migration(migrations.Migration):
     ]
 
     operations = [
+        linter.IgnoreMigration(),
         migrations.CreateModel(
             name='MobileAppVerificationToken',
             fields=[
diff --git a/engine/apps/oss_installation/migrations/0001_squashed_initial.py b/engine/apps/oss_installation/migrations/0001_squashed_initial.py
index b1a34cbd..fc7def6e 100644
--- a/engine/apps/oss_installation/migrations/0001_squashed_initial.py
+++ b/engine/apps/oss_installation/migrations/0001_squashed_initial.py
@@ -2,6 +2,7 @@
 
 from django.db import migrations, models
 import uuid
+import django_migration_linter as linter
 
 
 class Migration(migrations.Migration):
@@ -12,6 +13,7 @@ class Migration(migrations.Migration):
     ]
 
     operations = [
+        linter.IgnoreMigration(),
         migrations.CreateModel(
             name='CloudHeartbeat',
             fields=[
diff --git a/engine/apps/schedules/ical_utils.py b/engine/apps/schedules/ical_utils.py
index fd6cd341..5680b652 100644
--- a/engine/apps/schedules/ical_utils.py
+++ b/engine/apps/schedules/ical_utils.py
@@ -72,7 +72,11 @@ def users_in_ical(
 
     if users_to_filter is not None:
         return list(
-            {user for user in users_to_filter if user.username in usernames_from_ical or user.email in emails_from_ical}
+            {
+                user
+                for user in users_to_filter
+                if user.username in usernames_from_ical or user.email.lower() in emails_from_ical
+            }
         )
 
     users_found_in_ical = organization.users
diff --git a/engine/apps/schedules/migrations/0001_squashed_initial.py b/engine/apps/schedules/migrations/0001_squashed_initial.py
index 8456b7fe..e55e1aba 100644
--- a/engine/apps/schedules/migrations/0001_squashed_initial.py
+++ b/engine/apps/schedules/migrations/0001_squashed_initial.py
@@ -6,6 +6,7 @@ import django.core.validators
 from django.db import migrations, models
 import django.db.models.deletion
 import uuid
+import django_migration_linter as linter
 
 
 class Migration(migrations.Migration):
@@ -16,6 +17,7 @@ class Migration(migrations.Migration):
     ]
 
     operations = [
+        linter.IgnoreMigration(),
         migrations.CreateModel(
             name='CustomOnCallShift',
             fields=[
diff --git a/engine/apps/schedules/migrations/0002_squashed_initial.py b/engine/apps/schedules/migrations/0002_squashed_initial.py
index d5e25ccd..c33cf204 100644
--- a/engine/apps/schedules/migrations/0002_squashed_initial.py
+++ b/engine/apps/schedules/migrations/0002_squashed_initial.py
@@ -2,6 +2,7 @@
 
 from django.db import migrations, models
 import django.db.models.deletion
+import django_migration_linter as linter
 
 
 class Migration(migrations.Migration):
@@ -16,6 +17,7 @@ class Migration(migrations.Migration):
     ]
 
     operations = [
+        linter.IgnoreMigration(),
         migrations.AddField(
             model_name='oncallschedule',
             name='organization',
diff --git a/engine/apps/schedules/migrations/0003_alter_customoncallshift_frequency.py b/engine/apps/schedules/migrations/0003_alter_customoncallshift_frequency.py
index 239ce026..fa56dd7c 100644
--- a/engine/apps/schedules/migrations/0003_alter_customoncallshift_frequency.py
+++ b/engine/apps/schedules/migrations/0003_alter_customoncallshift_frequency.py
@@ -1,6 +1,7 @@
 # Generated by Django 3.2.5 on 2022-06-28 13:06
 
 from django.db import migrations, models
+import django_migration_linter as linter
 
 
 class Migration(migrations.Migration):
@@ -10,6 +11,7 @@ class Migration(migrations.Migration):
     ]
 
     operations = [
+        linter.IgnoreMigration(),
         migrations.AlterField(
             model_name='customoncallshift',
             name='frequency',
diff --git a/engine/apps/schedules/migrations/0004_customoncallshift_until.py b/engine/apps/schedules/migrations/0004_customoncallshift_until.py
index 46c3c8e2..3f501cfa 100644
--- a/engine/apps/schedules/migrations/0004_customoncallshift_until.py
+++ b/engine/apps/schedules/migrations/0004_customoncallshift_until.py
@@ -1,6 +1,7 @@
 # Generated by Django 3.2.5 on 2022-06-28 13:07
 
 from django.db import migrations, models
+import django_migration_linter as linter
 
 
 class Migration(migrations.Migration):
@@ -10,6 +11,7 @@ class Migration(migrations.Migration):
     ]
 
     operations = [
+        linter.IgnoreMigration(),
         migrations.AddField(
             model_name='customoncallshift',
             name='until',
diff --git a/engine/apps/schedules/migrations/0005_auto_20220704_1947.py b/engine/apps/schedules/migrations/0005_auto_20220704_1947.py
index 03b77e60..aa159184 100644
--- a/engine/apps/schedules/migrations/0005_auto_20220704_1947.py
+++ b/engine/apps/schedules/migrations/0005_auto_20220704_1947.py
@@ -2,6 +2,7 @@
 
 from django.db import migrations, models
 import django.db.models.deletion
+import django_migration_linter as linter
 
 
 class Migration(migrations.Migration):
@@ -11,6 +12,7 @@ class Migration(migrations.Migration):
     ]
 
     operations = [
+        linter.IgnoreMigration(),
         migrations.CreateModel(
             name='OnCallScheduleWeb',
             fields=[
diff --git a/engine/apps/schedules/migrations/0006_customoncallshift_rotation_start.py b/engine/apps/schedules/migrations/0006_customoncallshift_rotation_start.py
index 682df514..3a1c02e0 100644
--- a/engine/apps/schedules/migrations/0006_customoncallshift_rotation_start.py
+++ b/engine/apps/schedules/migrations/0006_customoncallshift_rotation_start.py
@@ -2,6 +2,7 @@
 
 from django.db import migrations, models
 from django.db.models import F
+import django_migration_linter as linter
 
 
 def fill_rotation_start_field(apps, schema_editor):
@@ -16,6 +17,7 @@ class Migration(migrations.Migration):
     ]
 
     operations = [
+        linter.IgnoreMigration(),
         migrations.AddField(
             model_name='customoncallshift',
             name='rotation_start',
diff --git a/engine/apps/schedules/migrations/0007_customoncallshift_updated_shift.py b/engine/apps/schedules/migrations/0007_customoncallshift_updated_shift.py
index c034f53a..a7c36c0b 100644
--- a/engine/apps/schedules/migrations/0007_customoncallshift_updated_shift.py
+++ b/engine/apps/schedules/migrations/0007_customoncallshift_updated_shift.py
@@ -2,6 +2,7 @@
 
 from django.db import migrations, models
 import django.db.models.deletion
+import django_migration_linter as linter
 
 
 class Migration(migrations.Migration):
@@ -11,6 +12,7 @@ class Migration(migrations.Migration):
     ]
 
     operations = [
+        linter.IgnoreMigration(),
         migrations.AddField(
             model_name='customoncallshift',
             name='updated_shift',
diff --git a/engine/apps/schedules/migrations/0008_auto_20221201_0809.py b/engine/apps/schedules/migrations/0008_auto_20221201_0809.py
index 0aee5c7e..27b9b6ad 100644
--- a/engine/apps/schedules/migrations/0008_auto_20221201_0809.py
+++ b/engine/apps/schedules/migrations/0008_auto_20221201_0809.py
@@ -5,6 +5,7 @@ from django.db import migrations
 from django.db.models import Q
 
 from common.timezones import is_valid_timezone
+import django_migration_linter as linter
 
 
 def fix_bad_timezone_values(model):
@@ -34,6 +35,7 @@ class Migration(migrations.Migration):
     ]
 
     operations = [
+        linter.IgnoreMigration(),
         migrations.RunPython(fix_bad_timezone_values('CustomOnCallShift')),
         migrations.RunPython(fix_bad_timezone_values('OnCallScheduleCalendar')),
         migrations.RunPython(fix_bad_timezone_values('OnCallScheduleWeb')),
diff --git a/engine/apps/schedules/tests/calendars/override_email_case_sensitivity.ics b/engine/apps/schedules/tests/calendars/override_email_case_sensitivity.ics
new file mode 100644
index 00000000..8b6a4430
--- /dev/null
+++ b/engine/apps/schedules/tests/calendars/override_email_case_sensitivity.ics
@@ -0,0 +1,21 @@
+BEGIN:VCALENDAR
+PRODID:-//Google Inc//Google Calendar 70.9054//EN
+VERSION:2.0
+CALSCALE:GREGORIAN
+METHOD:PUBLISH
+X-WR-CALNAME:test
+X-WR-TIMEZONE:Europe/London
+BEGIN:VEVENT
+DTSTART:20230206T110000Z
+DTEND:20230206T120000Z
+DTSTAMP:20230206T112228Z
+UID:16m6o1qji0fdg49coeflc202ss@google.com
+CREATED:20230206T112217Z
+DESCRIPTION:
+LAST-MODIFIED:20230206T112217Z
+SEQUENCE:0
+STATUS:CONFIRMED
+SUMMARY:Test@TEST.test
+TRANSP:OPAQUE
+END:VEVENT
+END:VCALENDAR
diff --git a/engine/apps/schedules/tests/test_custom_on_call_shift.py b/engine/apps/schedules/tests/test_custom_on_call_shift.py
index 7974ad91..47ff1d35 100644
--- a/engine/apps/schedules/tests/test_custom_on_call_shift.py
+++ b/engine/apps/schedules/tests/test_custom_on_call_shift.py
@@ -1382,6 +1382,37 @@ def test_get_oncall_users_for_multiple_schedules(
     )
 
 
+@pytest.mark.django_db
+def test_get_oncall_users_for_multiple_schedules_emails_case_insensitive(
+    get_ical,
+    make_organization,
+    make_user_for_organization,
+    make_on_call_shift,
+    make_schedule,
+):
+    """
+    Test that emails are case insensitive when matching users to on-call shifts.
+    https://github.com/grafana/oncall/issues/1296
+    """
+    organization = make_organization()
+
+    # user's email case is the opposite of the one in the ICal file below (Test@TEST.test)
+    user = make_user_for_organization(organization, email="tEST@test.TEST")
+    schedule = make_schedule(organization, schedule_class=OnCallScheduleCalendar)
+
+    # Load ICal file with an event for user with email Test@TEST.test for 6 February 2023, 11:00 UTC - 12:00 UTC
+    calendar = get_ical("override_email_case_sensitivity.ics")
+    schedule.cached_ical_file_overrides = calendar.to_ical().decode()
+    schedule.save(update_fields=["cached_ical_file_overrides"])
+
+    # Get on-call users for 6 February 2023 11:30 UTC
+    events_datetime = timezone.datetime(2023, 2, 6, 11, 30, tzinfo=timezone.utc)
+    schedules = OnCallSchedule.objects.filter(pk=schedule.pk)
+    oncall_users = schedules.get_oncall_users(events_datetime=events_datetime)
+
+    assert oncall_users == {schedule.pk: [user]}
+
+
 @pytest.mark.django_db
 def test_shift_convert_to_ical(make_organization_and_user, make_on_call_shift):
     organization, user = make_organization_and_user()
diff --git a/engine/apps/slack/migrations/0001_squashed_initial.py b/engine/apps/slack/migrations/0001_squashed_initial.py
index 7bc20cbb..3a3140d2 100644
--- a/engine/apps/slack/migrations/0001_squashed_initial.py
+++ b/engine/apps/slack/migrations/0001_squashed_initial.py
@@ -6,6 +6,7 @@ import django.core.validators
 from django.db import migrations, models
 import django.db.models.deletion
 import uuid
+import django_migration_linter as linter
 
 
 class Migration(migrations.Migration):
@@ -17,6 +18,7 @@ class Migration(migrations.Migration):
     ]
 
     operations = [
+        linter.IgnoreMigration(),
         migrations.CreateModel(
             name='SlackActionRecord',
             fields=[
diff --git a/engine/apps/slack/migrations/0002_squashed_initial.py b/engine/apps/slack/migrations/0002_squashed_initial.py
index 3f322e6d..d0595e79 100644
--- a/engine/apps/slack/migrations/0002_squashed_initial.py
+++ b/engine/apps/slack/migrations/0002_squashed_initial.py
@@ -2,6 +2,7 @@
 
 from django.db import migrations, models
 import django.db.models.deletion
+import django_migration_linter as linter
 
 
 class Migration(migrations.Migration):
@@ -14,6 +15,7 @@ class Migration(migrations.Migration):
     ]
 
     operations = [
+        linter.IgnoreMigration(),
         migrations.AddField(
             model_name='slackmessage',
             name='organization',
diff --git a/engine/apps/telegram/migrations/0001_squashed_initial.py b/engine/apps/telegram/migrations/0001_squashed_initial.py
index 196726e0..aea99590 100644
--- a/engine/apps/telegram/migrations/0001_squashed_initial.py
+++ b/engine/apps/telegram/migrations/0001_squashed_initial.py
@@ -5,6 +5,7 @@ import django.core.validators
 from django.db import migrations, models
 import django.db.models.deletion
 import uuid
+import django_migration_linter as linter
 
 
 class Migration(migrations.Migration):
@@ -17,6 +18,7 @@ class Migration(migrations.Migration):
     ]
 
     operations = [
+        linter.IgnoreMigration(),
         migrations.CreateModel(
             name='TelegramVerificationCode',
             fields=[
diff --git a/engine/apps/telegram/migrations/0002_alter_telegrammessage_message_type.py b/engine/apps/telegram/migrations/0002_alter_telegrammessage_message_type.py
index 96415381..8e59f282 100644
--- a/engine/apps/telegram/migrations/0002_alter_telegrammessage_message_type.py
+++ b/engine/apps/telegram/migrations/0002_alter_telegrammessage_message_type.py
@@ -1,6 +1,7 @@
 # Generated by Django 3.2.16 on 2022-12-29 14:42
 
 from django.db import migrations, models
+import django_migration_linter as linter
 
 
 class Migration(migrations.Migration):
@@ -10,6 +11,7 @@ class Migration(migrations.Migration):
     ]
 
     operations = [
+        linter.IgnoreMigration(),
         migrations.AlterField(
             model_name='telegrammessage',
             name='message_type',
diff --git a/engine/apps/twilioapp/migrations/0001_squashed_initial.py b/engine/apps/twilioapp/migrations/0001_squashed_initial.py
index cd76ebdf..ffd3183f 100644
--- a/engine/apps/twilioapp/migrations/0001_squashed_initial.py
+++ b/engine/apps/twilioapp/migrations/0001_squashed_initial.py
@@ -2,6 +2,7 @@
 
 from django.db import migrations, models
 import django.db.models.deletion
+import django_migration_linter as linter
 
 
 class Migration(migrations.Migration):
@@ -15,6 +16,7 @@ class Migration(migrations.Migration):
     ]
 
     operations = [
+        linter.IgnoreMigration(),
         migrations.CreateModel(
             name='TwilioLogRecord',
             fields=[
diff --git a/engine/apps/twilioapp/migrations/0002_auto_20220604_1008.py b/engine/apps/twilioapp/migrations/0002_auto_20220604_1008.py
index cddd898c..4771d7a1 100644
--- a/engine/apps/twilioapp/migrations/0002_auto_20220604_1008.py
+++ b/engine/apps/twilioapp/migrations/0002_auto_20220604_1008.py
@@ -1,6 +1,7 @@
 # Generated by Django 3.2.5 on 2022-06-04 10:08
 
 from django.db import migrations, models
+import django_migration_linter as linter
 
 
 class Migration(migrations.Migration):
@@ -10,6 +11,7 @@ class Migration(migrations.Migration):
     ]
 
     operations = [
+        linter.IgnoreMigration(),
         migrations.AddField(
             model_name='phonecall',
             name='grafana_cloud_notification',
diff --git a/engine/apps/user_management/migrations/0001_squashed_initial.py b/engine/apps/user_management/migrations/0001_squashed_initial.py
index e88a5acb..c2308b64 100644
--- a/engine/apps/user_management/migrations/0001_squashed_initial.py
+++ b/engine/apps/user_management/migrations/0001_squashed_initial.py
@@ -8,6 +8,7 @@ import django.core.validators
 from django.db import migrations, models
 import django.db.models.deletion
 import mirage.fields
+import django_migration_linter as linter
 
 
 class Migration(migrations.Migration):
@@ -20,6 +21,7 @@ class Migration(migrations.Migration):
     ]
 
     operations = [
+        linter.IgnoreMigration(),
         migrations.CreateModel(
             name='Organization',
             fields=[
diff --git a/engine/apps/user_management/migrations/0002_auto_20220705_1214.py b/engine/apps/user_management/migrations/0002_auto_20220705_1214.py
index 976bfe7a..fce96fe1 100644
--- a/engine/apps/user_management/migrations/0002_auto_20220705_1214.py
+++ b/engine/apps/user_management/migrations/0002_auto_20220705_1214.py
@@ -2,6 +2,7 @@
 
 import apps.user_management.models.user
 from django.db import migrations, models
+import django_migration_linter as linter
 
 
 class Migration(migrations.Migration):
@@ -11,6 +12,7 @@ class Migration(migrations.Migration):
     ]
 
     operations = [
+        linter.IgnoreMigration(),
         migrations.AddField(
             model_name='user',
             name='_timezone',
diff --git a/engine/apps/user_management/migrations/0003_user_hide_phone_number.py b/engine/apps/user_management/migrations/0003_user_hide_phone_number.py
index e1d3a0ed..272e94a0 100644
--- a/engine/apps/user_management/migrations/0003_user_hide_phone_number.py
+++ b/engine/apps/user_management/migrations/0003_user_hide_phone_number.py
@@ -1,6 +1,7 @@
 # Generated by Django 3.2.5 on 2022-08-25 08:51
 
 from django.db import migrations, models
+import django_migration_linter as linter
 
 
 class Migration(migrations.Migration):
@@ -10,6 +11,7 @@ class Migration(migrations.Migration):
     ]
 
     operations = [
+        linter.IgnoreMigration(),
         migrations.AddField(
             model_name='user',
             name='hide_phone_number',
diff --git a/engine/apps/user_management/migrations/0004_auto_20221025_0316.py b/engine/apps/user_management/migrations/0004_auto_20221025_0316.py
index 8d1b15c8..01707dfd 100644
--- a/engine/apps/user_management/migrations/0004_auto_20221025_0316.py
+++ b/engine/apps/user_management/migrations/0004_auto_20221025_0316.py
@@ -2,6 +2,7 @@
 
 from django.db import migrations, models
 import django.db.models.deletion
+import django_migration_linter as linter
 
 
 class Migration(migrations.Migration):
@@ -11,6 +12,7 @@ class Migration(migrations.Migration):
     ]
 
     operations = [
+        linter.IgnoreMigration(),
         migrations.CreateModel(
             name='Region',
             fields=[
diff --git a/engine/apps/user_management/migrations/0005_rbac_permissions.py b/engine/apps/user_management/migrations/0005_rbac_permissions.py
index 560aa144..e1f4d5d7 100644
--- a/engine/apps/user_management/migrations/0005_rbac_permissions.py
+++ b/engine/apps/user_management/migrations/0005_rbac_permissions.py
@@ -1,6 +1,7 @@
 # Generated by Django 3.2.15 on 2022-10-25 11:18
 
 from django.db import migrations, models
+import django_migration_linter as linter
 
 
 class Migration(migrations.Migration):
@@ -10,6 +11,7 @@ class Migration(migrations.Migration):
     ]
 
     operations = [
+        linter.IgnoreMigration(),
         migrations.AddField(
             model_name='organization',
             name='is_rbac_permissions_enabled',
diff --git a/engine/apps/user_management/migrations/0006_organization_uuid.py b/engine/apps/user_management/migrations/0006_organization_uuid.py
index ab2e1d2b..e58c0bd6 100644
--- a/engine/apps/user_management/migrations/0006_organization_uuid.py
+++ b/engine/apps/user_management/migrations/0006_organization_uuid.py
@@ -2,6 +2,7 @@
 
 from django.db import migrations, models
 import uuid
+import django_migration_linter as linter
 
 
 def fill_org_uuid(apps, schema_editor):
@@ -20,6 +21,7 @@ class Migration(migrations.Migration):
     ]
 
     operations = [
+        linter.IgnoreMigration(),
         migrations.AddField(
             model_name='organization',
             name='uuid',
diff --git a/engine/apps/user_management/migrations/0007_organization_deleted_at.py b/engine/apps/user_management/migrations/0007_organization_deleted_at.py
index fd80179e..76a718c5 100644
--- a/engine/apps/user_management/migrations/0007_organization_deleted_at.py
+++ b/engine/apps/user_management/migrations/0007_organization_deleted_at.py
@@ -1,6 +1,7 @@
 # Generated by Django 3.2.16 on 2023-01-04 05:06
 
 from django.db import migrations, models
+import django_migration_linter as linter
 
 
 class Migration(migrations.Migration):
@@ -10,6 +11,7 @@ class Migration(migrations.Migration):
     ]
 
     operations = [
+        linter.IgnoreMigration(),
         migrations.AddField(
             model_name='organization',
             name='deleted_at',
diff --git a/engine/apps/user_management/migrations/0008_organization_is_grafana_incident_enabled.py b/engine/apps/user_management/migrations/0008_organization_is_grafana_incident_enabled.py
index 3c8598e9..b7d75913 100644
--- a/engine/apps/user_management/migrations/0008_organization_is_grafana_incident_enabled.py
+++ b/engine/apps/user_management/migrations/0008_organization_is_grafana_incident_enabled.py
@@ -1,6 +1,7 @@
 # Generated by Django 3.2.16 on 2023-01-16 09:41
 
 from django.db import migrations, models
+import django_migration_linter as linter
 
 
 class Migration(migrations.Migration):
@@ -10,6 +11,7 @@ class Migration(migrations.Migration):
     ]
 
     operations = [
+        linter.IgnoreMigration(),
         migrations.AddField(
             model_name='organization',
             name='is_grafana_incident_enabled',
diff --git a/engine/requirements.txt b/engine/requirements.txt
index ace5bb9c..08e382f5 100644
--- a/engine/requirements.txt
+++ b/engine/requirements.txt
@@ -1,4 +1,4 @@
-django==3.2.16
+django==3.2.17
 djangorestframework==3.12.4
 slackclient==1.3.0
 whitenoise==5.3.0
@@ -41,6 +41,7 @@ psycopg2==2.9.3
 emoji==1.7.0
 regex==2021.11.2
 psutil==5.9.4
+django-migration-linter==4.1.0
 opentelemetry-instrumentation-celery==0.36b0
 opentelemetry-instrumentation-pymysql==0.36b0
 opentelemetry-instrumentation-wsgi==0.36b0
diff --git a/engine/settings/base.py b/engine/settings/base.py
index 3e7bf3a3..39c2ad3d 100644
--- a/engine/settings/base.py
+++ b/engine/settings/base.py
@@ -219,6 +219,7 @@ INSTALLED_APPS = [
     "debug_toolbar",
     "social_django",
     "polymorphic",
+    "django_migration_linter",
     "fcm_django",
     "django_dbconn_retry",
 ]
@@ -654,6 +655,10 @@ if OSS_INSTALLATION:
         "args": (),
     }  # noqa
 
+MIGRATION_LINTER_OPTIONS = {"exclude_apps": ["social_django", "silk", "fcm_django"]}
+# Run migrations linter on each `python manage.py makemigrations`
+MIGRATION_LINTER_OVERRIDE_MAKEMIGRATIONS = True
+
 PYROSCOPE_PROFILER_ENABLED = getenv_boolean("PYROSCOPE_PROFILER_ENABLED", default=False)
 if PYROSCOPE_PROFILER_ENABLED:
     import pyroscope
diff --git a/grafana-plugin/src/style/vars.css b/grafana-plugin/src/style/vars.css
index bb0f2853..9e9b920c 100644
--- a/grafana-plugin/src/style/vars.css
+++ b/grafana-plugin/src/style/vars.css
@@ -27,7 +27,7 @@
   --primary-text-color: rgb(36, 41, 46);
   --secondary-text-color: rgba(36, 41, 46, 0.75);
   --disabled-text-color: rgba(36, 41, 46, 0.5);
-  --warning-text-color: #8a6c00;
+  --warning-text-color: rgb(255, 120, 10);
   --success-text-color: rgb(10, 118, 78);
   --error-text-color: rgb(207, 14, 91);
   --primary-text-link: #1f62e0;
@@ -56,7 +56,7 @@
   --primary-text-color: rgb(204, 204, 220);
   --secondary-text-color: rgba(204, 204, 220, 0.65);
   --disabled-text-color: rgba(204, 204, 220, 0.4);
-  --warning-text-color: #f8d06b;
+  --warning-text-color: rgb(255, 120, 10);
   --success-text-color: rgb(108, 207, 142);
   --error-text-color: rgb(255, 82, 134);
   --primary-text-link: #6e9fff;