diff --git a/analytics/tests/test_support_views.py b/analytics/tests/test_support_views.py
index 303f7cfc73..af08f9fe64 100644
--- a/analytics/tests/test_support_views.py
+++ b/analytics/tests/test_support_views.py
@@ -8,7 +8,7 @@ from django.utils.timezone import now as timezone_now
 from corporate.lib.stripe import add_months, update_sponsorship_status
 from corporate.models import Customer, CustomerPlan, LicenseLedger, get_customer_by_realm
 from zerver.actions.invites import do_create_multiuse_invite_link
-from zerver.lib.actions import do_send_realm_reactivation_email, do_set_realm_property
+from zerver.actions.realm_settings import do_send_realm_reactivation_email, do_set_realm_property
 from zerver.lib.test_classes import ZulipTestCase
 from zerver.lib.test_helpers import reset_emails_in_zulip_realm
 from zerver.models import (
diff --git a/analytics/views/support.py b/analytics/views/support.py
index 5da64c9104..4174d0bde9 100644
--- a/analytics/views/support.py
+++ b/analytics/views/support.py
@@ -16,16 +16,16 @@ from django.utils.translation import gettext as _
 
 from confirmation.models import Confirmation, confirmation_url
 from confirmation.settings import STATUS_ACTIVE
-from zerver.decorator import require_server_admin
-from zerver.forms import check_subdomain_available
-from zerver.lib.actions import (
+from zerver.actions.realm_settings import (
     do_change_realm_org_type,
     do_change_realm_plan_type,
-    do_change_realm_subdomain,
     do_deactivate_realm,
     do_scrub_realm,
     do_send_realm_reactivation_email,
 )
+from zerver.decorator import require_server_admin
+from zerver.forms import check_subdomain_available
+from zerver.lib.actions import do_change_realm_subdomain
 from zerver.lib.exceptions import JsonableError
 from zerver.lib.realm_icon import realm_icon_url
 from zerver.lib.request import REQ, has_request_variables
diff --git a/corporate/lib/stripe.py b/corporate/lib/stripe.py
index 4ded9ee9aa..e8b22fd48b 100644
--- a/corporate/lib/stripe.py
+++ b/corporate/lib/stripe.py
@@ -746,7 +746,7 @@ def process_initial_upgrade(
         )
         stripe.Invoice.finalize_invoice(stripe_invoice)
 
-    from zerver.lib.actions import do_change_realm_plan_type
+    from zerver.actions.realm_settings import do_change_realm_plan_type
 
     do_change_realm_plan_type(realm, Realm.PLAN_TYPE_STANDARD, acting_user=user)
 
@@ -970,7 +970,7 @@ def update_sponsorship_status(
 
 def approve_sponsorship(realm: Realm, *, acting_user: Optional[UserProfile]) -> None:
     from zerver.actions.message_send import internal_send_private_message
-    from zerver.lib.actions import do_change_realm_plan_type
+    from zerver.actions.realm_settings import do_change_realm_plan_type
 
     do_change_realm_plan_type(realm, Realm.PLAN_TYPE_STANDARD_FREE, acting_user=acting_user)
     customer = get_customer_by_realm(realm)
@@ -1019,7 +1019,7 @@ def do_change_plan_status(plan: CustomerPlan, status: int) -> None:
 
 
 def process_downgrade(plan: CustomerPlan) -> None:
-    from zerver.lib.actions import do_change_realm_plan_type
+    from zerver.actions.realm_settings import do_change_realm_plan_type
 
     assert plan.customer.realm is not None
     do_change_realm_plan_type(plan.customer.realm, Realm.PLAN_TYPE_LIMITED, acting_user=None)
diff --git a/corporate/tests/test_stripe.py b/corporate/tests/test_stripe.py
index b4dae87f6a..7dc9fb9ed6 100644
--- a/corporate/tests/test_stripe.py
+++ b/corporate/tests/test_stripe.py
@@ -85,8 +85,9 @@ from zerver.actions.create_user import (
     do_create_user,
     do_reactivate_user,
 )
+from zerver.actions.realm_settings import do_deactivate_realm, do_reactivate_realm
 from zerver.actions.users import do_deactivate_user
-from zerver.lib.actions import do_create_realm, do_deactivate_realm, do_reactivate_realm
+from zerver.lib.actions import do_create_realm
 from zerver.lib.test_classes import ZulipTestCase
 from zerver.lib.timestamp import datetime_to_timestamp, timestamp_to_datetime
 from zerver.lib.utils import assert_is_not_none
diff --git a/docs/tutorials/new-feature-tutorial.md b/docs/tutorials/new-feature-tutorial.md
index efc0d396cd..6a169a34bb 100644
--- a/docs/tutorials/new-feature-tutorial.md
+++ b/docs/tutorials/new-feature-tutorial.md
@@ -38,7 +38,7 @@ organization in Zulip). The following files are involved in the process:
 - `zerver/models.py`: Defines the database model.
 - `zerver/views/realm.py`: The view function that implements the API endpoint
   for editing realm objects.
-- `zerver/lib/actions.py`: Contains code for updating and interacting with the database.
+- `zerver/actions/realm_settings.py`: Contains code for updating and interacting with the database.
 - `zerver/lib/events.py`: Ensures that the state Zulip sends to clients is always
   consistent and correct.
 
@@ -101,7 +101,7 @@ the flow of events even if the `property_types` framework means you don't
 have to write much code for a new setting.
 
 **Database interaction:** Add any necessary code for updating and
-interacting with the database in `zerver/lib/actions.py`. It should
+interacting with the database in `zerver/actions/realm_settings.py`. It should
 update the database and send an event announcing the change.
 
 **Application state:** Modify the `fetch_initial_state_data` and
@@ -290,10 +290,10 @@ gory details.
 Anyway, getting back to implementation details...
 
 If you are working on a feature that is in the realm `property_types`
-dictionary, you will not need to add code to `zerver/lib/actions.py`, but
+dictionary, you will not need to add code to `zerver/actions/realm_settings.py`, but
 we will describe what the process in that file does:
 
-In `zerver/lib/actions.py`, the function `do_set_realm_property` takes
+In `zerver/actions/realm_settings.py`, the function `do_set_realm_property` takes
 in the name of a realm property to update and the value it should
 have. This function updates the database and triggers an event to
 notify clients about the change. It uses the field's type, specified
@@ -310,7 +310,7 @@ time display format), members in a particular stream only or all
 active users in a realm.
 
 ```python
-# zerver/lib/actions.py
+# zerver/actions/realm_settings.py
 
 def do_set_realm_property(
     realm: Realm, name: str, value: Any, *, acting_user: Optional[UserProfile]
@@ -340,7 +340,7 @@ field), you'll need to create a new function to explicitly update this
 field and send an event. For example:
 
 ```python
-# zerver/lib/actions.py
+# zerver/actions/realm_settings.p
 
 def do_set_realm_authentication_methods(
     realm: Realm, authentication_methods: Dict[str, bool], *, acting_user: Optional[UserProfile]
@@ -480,7 +480,7 @@ with the new value. E.g., for `authentication_methods`, we created
 # zerver/views/realm.py
 
 # import do_set_realm_authentication_methods from actions.py
-from zerver.lib.actions import (
+from zerver.actions.realm_settings import (
     do_set_realm_message_editing,
     do_set_realm_authentication_methods,
     # ...
diff --git a/tools/test-api b/tools/test-api
index b95550420f..0439dd3ea6 100755
--- a/tools/test-api
+++ b/tools/test-api
@@ -32,8 +32,8 @@ with test_server_running(
     # zerver imports should happen after `django.setup()` is run
     # by the test_server_running decorator.
     from zerver.actions.create_user import do_create_user, do_reactivate_user
+    from zerver.actions.realm_settings import do_deactivate_realm, do_reactivate_realm
     from zerver.actions.users import change_user_is_active
-    from zerver.lib.actions import do_deactivate_realm, do_reactivate_realm
     from zerver.lib.test_helpers import reset_emails_in_zulip_realm
     from zerver.lib.users import get_api_key
     from zerver.models import get_realm, get_user
diff --git a/zerver/actions/realm_settings.py b/zerver/actions/realm_settings.py
new file mode 100644
index 0000000000..89bc5e44d3
--- /dev/null
+++ b/zerver/actions/realm_settings.py
@@ -0,0 +1,472 @@
+from typing import Any, Dict, Optional, Sequence
+
+import orjson
+from django.conf import settings
+from django.db import transaction
+from django.utils.timezone import now as timezone_now
+
+from confirmation.models import Confirmation, create_confirmation_link, generate_key
+from zerver.actions.custom_profile_fields import do_remove_realm_custom_profile_fields
+from zerver.actions.message_edit import do_delete_messages_by_sender
+from zerver.actions.user_groups import update_users_in_full_members_system_group
+from zerver.actions.user_settings import do_delete_avatar_image, send_user_email_update_event
+from zerver.lib.cache import flush_user_profile
+from zerver.lib.create_user import get_display_email_address
+from zerver.lib.message import update_first_visible_message_id
+from zerver.lib.send_email import FromAddress, send_email_to_admins
+from zerver.lib.sessions import delete_user_sessions
+from zerver.lib.user_counts import realm_user_count_by_role
+from zerver.models import (
+    Attachment,
+    Realm,
+    RealmAuditLog,
+    RealmUserDefault,
+    ScheduledEmail,
+    Stream,
+    UserProfile,
+    active_user_ids,
+)
+from zerver.tornado.django_api import send_event
+
+if settings.BILLING_ENABLED:
+    from corporate.lib.stripe import downgrade_now_without_creating_additional_invoices
+
+
+def active_humans_in_realm(realm: Realm) -> Sequence[UserProfile]:
+    return UserProfile.objects.filter(realm=realm, is_active=True, is_bot=False)
+
+
+@transaction.atomic(savepoint=False)
+def do_set_realm_property(
+    realm: Realm, name: str, value: Any, *, acting_user: Optional[UserProfile]
+) -> None:
+    """Takes in a realm object, the name of an attribute to update, the
+    value to update and and the user who initiated the update.
+    """
+    property_type = Realm.property_types[name]
+    assert isinstance(
+        value, property_type
+    ), f"Cannot update {name}: {value} is not an instance of {property_type}"
+
+    old_value = getattr(realm, name)
+    setattr(realm, name, value)
+    realm.save(update_fields=[name])
+
+    event = dict(
+        type="realm",
+        op="update",
+        property=name,
+        value=value,
+    )
+    transaction.on_commit(lambda: send_event(realm, event, active_user_ids(realm.id)))
+
+    event_time = timezone_now()
+    RealmAuditLog.objects.create(
+        realm=realm,
+        event_type=RealmAuditLog.REALM_PROPERTY_CHANGED,
+        event_time=event_time,
+        acting_user=acting_user,
+        extra_data=orjson.dumps(
+            {
+                RealmAuditLog.OLD_VALUE: old_value,
+                RealmAuditLog.NEW_VALUE: value,
+                "property": name,
+            }
+        ).decode(),
+    )
+
+    if name == "email_address_visibility":
+        if Realm.EMAIL_ADDRESS_VISIBILITY_EVERYONE not in [old_value, value]:
+            # We use real email addresses on UserProfile.email only if
+            # EMAIL_ADDRESS_VISIBILITY_EVERYONE is configured, so
+            # changes between values that will not require changing
+            # that field, so we can save work and return here.
+            return
+
+        user_profiles = UserProfile.objects.filter(realm=realm, is_bot=False)
+        for user_profile in user_profiles:
+            user_profile.email = get_display_email_address(user_profile)
+        UserProfile.objects.bulk_update(user_profiles, ["email"])
+
+        for user_profile in user_profiles:
+            transaction.on_commit(
+                lambda: flush_user_profile(sender=UserProfile, instance=user_profile)
+            )
+            # TODO: Design a bulk event for this or force-reload all clients
+            send_user_email_update_event(user_profile)
+
+    if name == "waiting_period_threshold":
+        update_users_in_full_members_system_group(realm)
+
+
+def do_set_realm_authentication_methods(
+    realm: Realm, authentication_methods: Dict[str, bool], *, acting_user: Optional[UserProfile]
+) -> None:
+    old_value = realm.authentication_methods_dict()
+    with transaction.atomic():
+        for key, value in list(authentication_methods.items()):
+            index = getattr(realm.authentication_methods, key).number
+            realm.authentication_methods.set_bit(index, int(value))
+        realm.save(update_fields=["authentication_methods"])
+        updated_value = realm.authentication_methods_dict()
+        RealmAuditLog.objects.create(
+            realm=realm,
+            event_type=RealmAuditLog.REALM_PROPERTY_CHANGED,
+            event_time=timezone_now(),
+            acting_user=acting_user,
+            extra_data=orjson.dumps(
+                {
+                    RealmAuditLog.OLD_VALUE: old_value,
+                    RealmAuditLog.NEW_VALUE: updated_value,
+                    "property": "authentication_methods",
+                }
+            ).decode(),
+        )
+
+    event = dict(
+        type="realm",
+        op="update_dict",
+        property="default",
+        data=dict(authentication_methods=updated_value),
+    )
+    send_event(realm, event, active_user_ids(realm.id))
+
+
+def do_set_realm_message_editing(
+    realm: Realm,
+    allow_message_editing: bool,
+    message_content_edit_limit_seconds: int,
+    edit_topic_policy: int,
+    *,
+    acting_user: Optional[UserProfile],
+) -> None:
+    old_values = dict(
+        allow_message_editing=realm.allow_message_editing,
+        message_content_edit_limit_seconds=realm.message_content_edit_limit_seconds,
+        edit_topic_policy=realm.edit_topic_policy,
+    )
+
+    realm.allow_message_editing = allow_message_editing
+    realm.message_content_edit_limit_seconds = message_content_edit_limit_seconds
+    realm.edit_topic_policy = edit_topic_policy
+
+    event_time = timezone_now()
+    updated_properties = dict(
+        allow_message_editing=allow_message_editing,
+        message_content_edit_limit_seconds=message_content_edit_limit_seconds,
+        edit_topic_policy=edit_topic_policy,
+    )
+
+    with transaction.atomic():
+        for updated_property, updated_value in updated_properties.items():
+            if updated_value == old_values[updated_property]:
+                continue
+            RealmAuditLog.objects.create(
+                realm=realm,
+                event_type=RealmAuditLog.REALM_PROPERTY_CHANGED,
+                event_time=event_time,
+                acting_user=acting_user,
+                extra_data=orjson.dumps(
+                    {
+                        RealmAuditLog.OLD_VALUE: old_values[updated_property],
+                        RealmAuditLog.NEW_VALUE: updated_value,
+                        "property": updated_property,
+                    }
+                ).decode(),
+            )
+
+        realm.save(update_fields=list(updated_properties.keys()))
+
+    event = dict(
+        type="realm",
+        op="update_dict",
+        property="default",
+        data=updated_properties,
+    )
+    send_event(realm, event, active_user_ids(realm.id))
+
+
+def do_set_realm_notifications_stream(
+    realm: Realm, stream: Optional[Stream], stream_id: int, *, acting_user: Optional[UserProfile]
+) -> None:
+    old_value = realm.notifications_stream_id
+    realm.notifications_stream = stream
+    with transaction.atomic():
+        realm.save(update_fields=["notifications_stream"])
+
+        event_time = timezone_now()
+        RealmAuditLog.objects.create(
+            realm=realm,
+            event_type=RealmAuditLog.REALM_PROPERTY_CHANGED,
+            event_time=event_time,
+            acting_user=acting_user,
+            extra_data=orjson.dumps(
+                {
+                    RealmAuditLog.OLD_VALUE: old_value,
+                    RealmAuditLog.NEW_VALUE: stream_id,
+                    "property": "notifications_stream",
+                }
+            ).decode(),
+        )
+
+    event = dict(
+        type="realm",
+        op="update",
+        property="notifications_stream_id",
+        value=stream_id,
+    )
+    send_event(realm, event, active_user_ids(realm.id))
+
+
+def do_set_realm_signup_notifications_stream(
+    realm: Realm, stream: Optional[Stream], stream_id: int, *, acting_user: Optional[UserProfile]
+) -> None:
+    old_value = realm.signup_notifications_stream_id
+    realm.signup_notifications_stream = stream
+    with transaction.atomic():
+        realm.save(update_fields=["signup_notifications_stream"])
+
+        event_time = timezone_now()
+        RealmAuditLog.objects.create(
+            realm=realm,
+            event_type=RealmAuditLog.REALM_PROPERTY_CHANGED,
+            event_time=event_time,
+            acting_user=acting_user,
+            extra_data=orjson.dumps(
+                {
+                    RealmAuditLog.OLD_VALUE: old_value,
+                    RealmAuditLog.NEW_VALUE: stream_id,
+                    "property": "signup_notifications_stream",
+                }
+            ).decode(),
+        )
+    event = dict(
+        type="realm",
+        op="update",
+        property="signup_notifications_stream_id",
+        value=stream_id,
+    )
+    send_event(realm, event, active_user_ids(realm.id))
+
+
+def do_set_realm_user_default_setting(
+    realm_user_default: RealmUserDefault,
+    name: str,
+    value: Any,
+    *,
+    acting_user: Optional[UserProfile],
+) -> None:
+    old_value = getattr(realm_user_default, name)
+    realm = realm_user_default.realm
+    event_time = timezone_now()
+
+    with transaction.atomic(savepoint=False):
+        setattr(realm_user_default, name, value)
+        realm_user_default.save(update_fields=[name])
+
+        RealmAuditLog.objects.create(
+            realm=realm,
+            event_type=RealmAuditLog.REALM_DEFAULT_USER_SETTINGS_CHANGED,
+            event_time=event_time,
+            acting_user=acting_user,
+            extra_data=orjson.dumps(
+                {
+                    RealmAuditLog.OLD_VALUE: old_value,
+                    RealmAuditLog.NEW_VALUE: value,
+                    "property": name,
+                }
+            ).decode(),
+        )
+
+    event = dict(
+        type="realm_user_settings_defaults",
+        op="update",
+        property=name,
+        value=value,
+    )
+    send_event(realm, event, active_user_ids(realm.id))
+
+
+def do_deactivate_realm(realm: Realm, *, acting_user: Optional[UserProfile]) -> None:
+    """
+    Deactivate this realm. Do NOT deactivate the users -- we need to be able to
+    tell the difference between users that were intentionally deactivated,
+    e.g. by a realm admin, and users who can't currently use Zulip because their
+    realm has been deactivated.
+    """
+    if realm.deactivated:
+        return
+
+    realm.deactivated = True
+    realm.save(update_fields=["deactivated"])
+
+    if settings.BILLING_ENABLED:
+        downgrade_now_without_creating_additional_invoices(realm)
+
+    event_time = timezone_now()
+    RealmAuditLog.objects.create(
+        realm=realm,
+        event_type=RealmAuditLog.REALM_DEACTIVATED,
+        event_time=event_time,
+        acting_user=acting_user,
+        extra_data=orjson.dumps(
+            {
+                RealmAuditLog.ROLE_COUNT: realm_user_count_by_role(realm),
+            }
+        ).decode(),
+    )
+
+    ScheduledEmail.objects.filter(realm=realm).delete()
+    for user in active_humans_in_realm(realm):
+        # Don't deactivate the users, but do delete their sessions so they get
+        # bumped to the login screen, where they'll get a realm deactivation
+        # notice when they try to log in.
+        delete_user_sessions(user)
+
+    # This event will only ever be received by clients with an active
+    # longpoll connection, because by this point clients will be
+    # unable to authenticate again to their event queue (triggering an
+    # immediate reload into the page explaining the realm was
+    # deactivated). So the purpose of sending this is to flush all
+    # active longpoll connections for the realm.
+    event = dict(type="realm", op="deactivated", realm_id=realm.id)
+    send_event(realm, event, active_user_ids(realm.id))
+
+
+def do_reactivate_realm(realm: Realm) -> None:
+    realm.deactivated = False
+    with transaction.atomic():
+        realm.save(update_fields=["deactivated"])
+
+        event_time = timezone_now()
+        RealmAuditLog.objects.create(
+            realm=realm,
+            event_type=RealmAuditLog.REALM_REACTIVATED,
+            event_time=event_time,
+            extra_data=orjson.dumps(
+                {
+                    RealmAuditLog.ROLE_COUNT: realm_user_count_by_role(realm),
+                }
+            ).decode(),
+        )
+
+
+def do_add_deactivated_redirect(realm: Realm, redirect_url: str) -> None:
+    realm.deactivated_redirect = redirect_url
+    realm.save(update_fields=["deactivated_redirect"])
+
+
+def do_scrub_realm(realm: Realm, *, acting_user: Optional[UserProfile]) -> None:
+    if settings.BILLING_ENABLED:
+        downgrade_now_without_creating_additional_invoices(realm)
+
+    users = UserProfile.objects.filter(realm=realm)
+    for user in users:
+        do_delete_messages_by_sender(user)
+        do_delete_avatar_image(user, acting_user=acting_user)
+        user.full_name = f"Scrubbed {generate_key()[:15]}"
+        scrubbed_email = f"scrubbed-{generate_key()[:15]}@{realm.host}"
+        user.email = scrubbed_email
+        user.delivery_email = scrubbed_email
+        user.save(update_fields=["full_name", "email", "delivery_email"])
+
+    do_remove_realm_custom_profile_fields(realm)
+    Attachment.objects.filter(realm=realm).delete()
+
+    RealmAuditLog.objects.create(
+        realm=realm,
+        event_time=timezone_now(),
+        acting_user=acting_user,
+        event_type=RealmAuditLog.REALM_SCRUBBED,
+    )
+
+
+@transaction.atomic(durable=True)
+def do_change_realm_org_type(
+    realm: Realm,
+    org_type: int,
+    acting_user: Optional[UserProfile],
+) -> None:
+    old_value = realm.org_type
+    realm.org_type = org_type
+    realm.save(update_fields=["org_type"])
+
+    RealmAuditLog.objects.create(
+        event_type=RealmAuditLog.REALM_ORG_TYPE_CHANGED,
+        realm=realm,
+        event_time=timezone_now(),
+        acting_user=acting_user,
+        extra_data={"old_value": old_value, "new_value": org_type},
+    )
+
+
+@transaction.atomic(savepoint=False)
+def do_change_realm_plan_type(
+    realm: Realm, plan_type: int, *, acting_user: Optional[UserProfile]
+) -> None:
+    old_value = realm.plan_type
+    realm.plan_type = plan_type
+    realm.save(update_fields=["plan_type"])
+    RealmAuditLog.objects.create(
+        event_type=RealmAuditLog.REALM_PLAN_TYPE_CHANGED,
+        realm=realm,
+        event_time=timezone_now(),
+        acting_user=acting_user,
+        extra_data={"old_value": old_value, "new_value": plan_type},
+    )
+
+    if plan_type == Realm.PLAN_TYPE_PLUS:
+        realm.max_invites = Realm.INVITES_STANDARD_REALM_DAILY_MAX
+        realm.message_visibility_limit = None
+        realm.upload_quota_gb = Realm.UPLOAD_QUOTA_STANDARD
+    elif plan_type == Realm.PLAN_TYPE_STANDARD:
+        realm.max_invites = Realm.INVITES_STANDARD_REALM_DAILY_MAX
+        realm.message_visibility_limit = None
+        realm.upload_quota_gb = Realm.UPLOAD_QUOTA_STANDARD
+    elif plan_type == Realm.PLAN_TYPE_SELF_HOSTED:
+        realm.max_invites = None  # type: ignore[assignment] # Apparent mypy bug with Optional[int] setter.
+        realm.message_visibility_limit = None
+        realm.upload_quota_gb = None
+    elif plan_type == Realm.PLAN_TYPE_STANDARD_FREE:
+        realm.max_invites = Realm.INVITES_STANDARD_REALM_DAILY_MAX
+        realm.message_visibility_limit = None
+        realm.upload_quota_gb = Realm.UPLOAD_QUOTA_STANDARD
+    elif plan_type == Realm.PLAN_TYPE_LIMITED:
+        realm.max_invites = settings.INVITES_DEFAULT_REALM_DAILY_MAX
+        realm.message_visibility_limit = Realm.MESSAGE_VISIBILITY_LIMITED
+        realm.upload_quota_gb = Realm.UPLOAD_QUOTA_LIMITED
+    else:
+        raise AssertionError("Invalid plan type")
+
+    update_first_visible_message_id(realm)
+
+    realm.save(update_fields=["_max_invites", "message_visibility_limit", "upload_quota_gb"])
+
+    event = {
+        "type": "realm",
+        "op": "update",
+        "property": "plan_type",
+        "value": plan_type,
+        "extra_data": {"upload_quota": realm.upload_quota_bytes()},
+    }
+    transaction.on_commit(lambda: send_event(realm, event, active_user_ids(realm.id)))
+
+
+def do_send_realm_reactivation_email(realm: Realm, *, acting_user: Optional[UserProfile]) -> None:
+    url = create_confirmation_link(realm, Confirmation.REALM_REACTIVATION)
+    RealmAuditLog.objects.create(
+        realm=realm,
+        acting_user=acting_user,
+        event_type=RealmAuditLog.REALM_REACTIVATION_EMAIL_SENT,
+        event_time=timezone_now(),
+    )
+    context = {"confirmation_url": url, "realm_uri": realm.uri, "realm_name": realm.name}
+    language = realm.default_language
+    send_email_to_admins(
+        "zerver/emails/realm_reactivation",
+        realm,
+        from_address=FromAddress.tokenized_no_reply_address(),
+        from_name=FromAddress.security_email_from_name(language=language),
+        language=language,
+        context=context,
+    )
diff --git a/zerver/lib/actions.py b/zerver/lib/actions.py
index 644dc6978d..5654919cba 100644
--- a/zerver/lib/actions.py
+++ b/zerver/lib/actions.py
@@ -1,6 +1,6 @@
 import datetime
 import logging
-from typing import Any, Dict, List, Optional, Sequence
+from typing import Any, Dict, List, Optional
 
 import orjson
 from django.conf import settings
@@ -8,32 +8,25 @@ from django.db import transaction
 from django.utils.timezone import now as timezone_now
 from django.utils.translation import gettext as _
 
-from confirmation.models import Confirmation, create_confirmation_link, generate_key
-from zerver.actions.custom_profile_fields import do_remove_realm_custom_profile_fields
-from zerver.actions.message_edit import do_delete_messages_by_sender
 from zerver.actions.message_send import internal_send_stream_message
-from zerver.actions.user_groups import update_users_in_full_members_system_group
-from zerver.actions.user_settings import do_delete_avatar_image, send_user_email_update_event
+from zerver.actions.realm_settings import (
+    do_add_deactivated_redirect,
+    do_change_realm_plan_type,
+    do_deactivate_realm,
+    do_set_realm_property,
+)
 from zerver.lib.bulk_create import create_users
-from zerver.lib.cache import flush_user_profile
-from zerver.lib.create_user import get_display_email_address
-from zerver.lib.message import update_first_visible_message_id
-from zerver.lib.send_email import FromAddress, send_email_to_admins
 from zerver.lib.server_initialization import create_internal_realm, server_initialized
-from zerver.lib.sessions import delete_user_sessions
 from zerver.lib.streams import ensure_stream, get_signups_stream
 from zerver.lib.topic import filter_by_topic_name_via_message
-from zerver.lib.user_counts import realm_user_count_by_role
 from zerver.lib.user_groups import create_system_user_groups_for_realm
 from zerver.models import (
-    Attachment,
     DefaultStream,
     Message,
     Realm,
     RealmAuditLog,
     RealmDomain,
     RealmUserDefault,
-    ScheduledEmail,
     Stream,
     UserMessage,
     UserProfile,
@@ -44,328 +37,6 @@ from zerver.models import (
 )
 from zerver.tornado.django_api import send_event
 
-if settings.BILLING_ENABLED:
-    from corporate.lib.stripe import downgrade_now_without_creating_additional_invoices
-
-
-def active_humans_in_realm(realm: Realm) -> Sequence[UserProfile]:
-    return UserProfile.objects.filter(realm=realm, is_active=True, is_bot=False)
-
-
-@transaction.atomic(savepoint=False)
-def do_set_realm_property(
-    realm: Realm, name: str, value: Any, *, acting_user: Optional[UserProfile]
-) -> None:
-    """Takes in a realm object, the name of an attribute to update, the
-    value to update and and the user who initiated the update.
-    """
-    property_type = Realm.property_types[name]
-    assert isinstance(
-        value, property_type
-    ), f"Cannot update {name}: {value} is not an instance of {property_type}"
-
-    old_value = getattr(realm, name)
-    setattr(realm, name, value)
-    realm.save(update_fields=[name])
-
-    event = dict(
-        type="realm",
-        op="update",
-        property=name,
-        value=value,
-    )
-    transaction.on_commit(lambda: send_event(realm, event, active_user_ids(realm.id)))
-
-    event_time = timezone_now()
-    RealmAuditLog.objects.create(
-        realm=realm,
-        event_type=RealmAuditLog.REALM_PROPERTY_CHANGED,
-        event_time=event_time,
-        acting_user=acting_user,
-        extra_data=orjson.dumps(
-            {
-                RealmAuditLog.OLD_VALUE: old_value,
-                RealmAuditLog.NEW_VALUE: value,
-                "property": name,
-            }
-        ).decode(),
-    )
-
-    if name == "email_address_visibility":
-        if Realm.EMAIL_ADDRESS_VISIBILITY_EVERYONE not in [old_value, value]:
-            # We use real email addresses on UserProfile.email only if
-            # EMAIL_ADDRESS_VISIBILITY_EVERYONE is configured, so
-            # changes between values that will not require changing
-            # that field, so we can save work and return here.
-            return
-
-        user_profiles = UserProfile.objects.filter(realm=realm, is_bot=False)
-        for user_profile in user_profiles:
-            user_profile.email = get_display_email_address(user_profile)
-        UserProfile.objects.bulk_update(user_profiles, ["email"])
-
-        for user_profile in user_profiles:
-            transaction.on_commit(
-                lambda: flush_user_profile(sender=UserProfile, instance=user_profile)
-            )
-            # TODO: Design a bulk event for this or force-reload all clients
-            send_user_email_update_event(user_profile)
-
-    if name == "waiting_period_threshold":
-        update_users_in_full_members_system_group(realm)
-
-
-def do_set_realm_authentication_methods(
-    realm: Realm, authentication_methods: Dict[str, bool], *, acting_user: Optional[UserProfile]
-) -> None:
-    old_value = realm.authentication_methods_dict()
-    with transaction.atomic():
-        for key, value in list(authentication_methods.items()):
-            index = getattr(realm.authentication_methods, key).number
-            realm.authentication_methods.set_bit(index, int(value))
-        realm.save(update_fields=["authentication_methods"])
-        updated_value = realm.authentication_methods_dict()
-        RealmAuditLog.objects.create(
-            realm=realm,
-            event_type=RealmAuditLog.REALM_PROPERTY_CHANGED,
-            event_time=timezone_now(),
-            acting_user=acting_user,
-            extra_data=orjson.dumps(
-                {
-                    RealmAuditLog.OLD_VALUE: old_value,
-                    RealmAuditLog.NEW_VALUE: updated_value,
-                    "property": "authentication_methods",
-                }
-            ).decode(),
-        )
-
-    event = dict(
-        type="realm",
-        op="update_dict",
-        property="default",
-        data=dict(authentication_methods=updated_value),
-    )
-    send_event(realm, event, active_user_ids(realm.id))
-
-
-def do_set_realm_message_editing(
-    realm: Realm,
-    allow_message_editing: bool,
-    message_content_edit_limit_seconds: int,
-    edit_topic_policy: int,
-    *,
-    acting_user: Optional[UserProfile],
-) -> None:
-    old_values = dict(
-        allow_message_editing=realm.allow_message_editing,
-        message_content_edit_limit_seconds=realm.message_content_edit_limit_seconds,
-        edit_topic_policy=realm.edit_topic_policy,
-    )
-
-    realm.allow_message_editing = allow_message_editing
-    realm.message_content_edit_limit_seconds = message_content_edit_limit_seconds
-    realm.edit_topic_policy = edit_topic_policy
-
-    event_time = timezone_now()
-    updated_properties = dict(
-        allow_message_editing=allow_message_editing,
-        message_content_edit_limit_seconds=message_content_edit_limit_seconds,
-        edit_topic_policy=edit_topic_policy,
-    )
-
-    with transaction.atomic():
-        for updated_property, updated_value in updated_properties.items():
-            if updated_value == old_values[updated_property]:
-                continue
-            RealmAuditLog.objects.create(
-                realm=realm,
-                event_type=RealmAuditLog.REALM_PROPERTY_CHANGED,
-                event_time=event_time,
-                acting_user=acting_user,
-                extra_data=orjson.dumps(
-                    {
-                        RealmAuditLog.OLD_VALUE: old_values[updated_property],
-                        RealmAuditLog.NEW_VALUE: updated_value,
-                        "property": updated_property,
-                    }
-                ).decode(),
-            )
-
-        realm.save(update_fields=list(updated_properties.keys()))
-
-    event = dict(
-        type="realm",
-        op="update_dict",
-        property="default",
-        data=updated_properties,
-    )
-    send_event(realm, event, active_user_ids(realm.id))
-
-
-def do_set_realm_notifications_stream(
-    realm: Realm, stream: Optional[Stream], stream_id: int, *, acting_user: Optional[UserProfile]
-) -> None:
-    old_value = realm.notifications_stream_id
-    realm.notifications_stream = stream
-    with transaction.atomic():
-        realm.save(update_fields=["notifications_stream"])
-
-        event_time = timezone_now()
-        RealmAuditLog.objects.create(
-            realm=realm,
-            event_type=RealmAuditLog.REALM_PROPERTY_CHANGED,
-            event_time=event_time,
-            acting_user=acting_user,
-            extra_data=orjson.dumps(
-                {
-                    RealmAuditLog.OLD_VALUE: old_value,
-                    RealmAuditLog.NEW_VALUE: stream_id,
-                    "property": "notifications_stream",
-                }
-            ).decode(),
-        )
-
-    event = dict(
-        type="realm",
-        op="update",
-        property="notifications_stream_id",
-        value=stream_id,
-    )
-    send_event(realm, event, active_user_ids(realm.id))
-
-
-def do_set_realm_signup_notifications_stream(
-    realm: Realm, stream: Optional[Stream], stream_id: int, *, acting_user: Optional[UserProfile]
-) -> None:
-    old_value = realm.signup_notifications_stream_id
-    realm.signup_notifications_stream = stream
-    with transaction.atomic():
-        realm.save(update_fields=["signup_notifications_stream"])
-
-        event_time = timezone_now()
-        RealmAuditLog.objects.create(
-            realm=realm,
-            event_type=RealmAuditLog.REALM_PROPERTY_CHANGED,
-            event_time=event_time,
-            acting_user=acting_user,
-            extra_data=orjson.dumps(
-                {
-                    RealmAuditLog.OLD_VALUE: old_value,
-                    RealmAuditLog.NEW_VALUE: stream_id,
-                    "property": "signup_notifications_stream",
-                }
-            ).decode(),
-        )
-    event = dict(
-        type="realm",
-        op="update",
-        property="signup_notifications_stream_id",
-        value=stream_id,
-    )
-    send_event(realm, event, active_user_ids(realm.id))
-
-
-def do_set_realm_user_default_setting(
-    realm_user_default: RealmUserDefault,
-    name: str,
-    value: Any,
-    *,
-    acting_user: Optional[UserProfile],
-) -> None:
-    old_value = getattr(realm_user_default, name)
-    realm = realm_user_default.realm
-    event_time = timezone_now()
-
-    with transaction.atomic(savepoint=False):
-        setattr(realm_user_default, name, value)
-        realm_user_default.save(update_fields=[name])
-
-        RealmAuditLog.objects.create(
-            realm=realm,
-            event_type=RealmAuditLog.REALM_DEFAULT_USER_SETTINGS_CHANGED,
-            event_time=event_time,
-            acting_user=acting_user,
-            extra_data=orjson.dumps(
-                {
-                    RealmAuditLog.OLD_VALUE: old_value,
-                    RealmAuditLog.NEW_VALUE: value,
-                    "property": name,
-                }
-            ).decode(),
-        )
-
-    event = dict(
-        type="realm_user_settings_defaults",
-        op="update",
-        property=name,
-        value=value,
-    )
-    send_event(realm, event, active_user_ids(realm.id))
-
-
-def do_deactivate_realm(realm: Realm, *, acting_user: Optional[UserProfile]) -> None:
-    """
-    Deactivate this realm. Do NOT deactivate the users -- we need to be able to
-    tell the difference between users that were intentionally deactivated,
-    e.g. by a realm admin, and users who can't currently use Zulip because their
-    realm has been deactivated.
-    """
-    if realm.deactivated:
-        return
-
-    realm.deactivated = True
-    realm.save(update_fields=["deactivated"])
-
-    if settings.BILLING_ENABLED:
-        downgrade_now_without_creating_additional_invoices(realm)
-
-    event_time = timezone_now()
-    RealmAuditLog.objects.create(
-        realm=realm,
-        event_type=RealmAuditLog.REALM_DEACTIVATED,
-        event_time=event_time,
-        acting_user=acting_user,
-        extra_data=orjson.dumps(
-            {
-                RealmAuditLog.ROLE_COUNT: realm_user_count_by_role(realm),
-            }
-        ).decode(),
-    )
-
-    ScheduledEmail.objects.filter(realm=realm).delete()
-    for user in active_humans_in_realm(realm):
-        # Don't deactivate the users, but do delete their sessions so they get
-        # bumped to the login screen, where they'll get a realm deactivation
-        # notice when they try to log in.
-        delete_user_sessions(user)
-
-    # This event will only ever be received by clients with an active
-    # longpoll connection, because by this point clients will be
-    # unable to authenticate again to their event queue (triggering an
-    # immediate reload into the page explaining the realm was
-    # deactivated). So the purpose of sending this is to flush all
-    # active longpoll connections for the realm.
-    event = dict(type="realm", op="deactivated", realm_id=realm.id)
-    send_event(realm, event, active_user_ids(realm.id))
-
-
-def do_reactivate_realm(realm: Realm) -> None:
-    realm.deactivated = False
-    with transaction.atomic():
-        realm.save(update_fields=["deactivated"])
-
-        event_time = timezone_now()
-        RealmAuditLog.objects.create(
-            realm=realm,
-            event_type=RealmAuditLog.REALM_REACTIVATED,
-            event_time=event_time,
-            extra_data=orjson.dumps(
-                {
-                    RealmAuditLog.ROLE_COUNT: realm_user_count_by_role(realm),
-                }
-            ).decode(),
-        )
-
 
 def do_change_realm_subdomain(
     realm: Realm, new_subdomain: str, *, acting_user: Optional[UserProfile]
@@ -412,107 +83,6 @@ def do_change_realm_subdomain(
     do_add_deactivated_redirect(placeholder_realm, realm.uri)
 
 
-def do_add_deactivated_redirect(realm: Realm, redirect_url: str) -> None:
-    realm.deactivated_redirect = redirect_url
-    realm.save(update_fields=["deactivated_redirect"])
-
-
-def do_scrub_realm(realm: Realm, *, acting_user: Optional[UserProfile]) -> None:
-    if settings.BILLING_ENABLED:
-        downgrade_now_without_creating_additional_invoices(realm)
-
-    users = UserProfile.objects.filter(realm=realm)
-    for user in users:
-        do_delete_messages_by_sender(user)
-        do_delete_avatar_image(user, acting_user=acting_user)
-        user.full_name = f"Scrubbed {generate_key()[:15]}"
-        scrubbed_email = f"scrubbed-{generate_key()[:15]}@{realm.host}"
-        user.email = scrubbed_email
-        user.delivery_email = scrubbed_email
-        user.save(update_fields=["full_name", "email", "delivery_email"])
-
-    do_remove_realm_custom_profile_fields(realm)
-    Attachment.objects.filter(realm=realm).delete()
-
-    RealmAuditLog.objects.create(
-        realm=realm,
-        event_time=timezone_now(),
-        acting_user=acting_user,
-        event_type=RealmAuditLog.REALM_SCRUBBED,
-    )
-
-
-@transaction.atomic(durable=True)
-def do_change_realm_org_type(
-    realm: Realm,
-    org_type: int,
-    acting_user: Optional[UserProfile],
-) -> None:
-    old_value = realm.org_type
-    realm.org_type = org_type
-    realm.save(update_fields=["org_type"])
-
-    RealmAuditLog.objects.create(
-        event_type=RealmAuditLog.REALM_ORG_TYPE_CHANGED,
-        realm=realm,
-        event_time=timezone_now(),
-        acting_user=acting_user,
-        extra_data={"old_value": old_value, "new_value": org_type},
-    )
-
-
-@transaction.atomic(savepoint=False)
-def do_change_realm_plan_type(
-    realm: Realm, plan_type: int, *, acting_user: Optional[UserProfile]
-) -> None:
-    old_value = realm.plan_type
-    realm.plan_type = plan_type
-    realm.save(update_fields=["plan_type"])
-    RealmAuditLog.objects.create(
-        event_type=RealmAuditLog.REALM_PLAN_TYPE_CHANGED,
-        realm=realm,
-        event_time=timezone_now(),
-        acting_user=acting_user,
-        extra_data={"old_value": old_value, "new_value": plan_type},
-    )
-
-    if plan_type == Realm.PLAN_TYPE_PLUS:
-        realm.max_invites = Realm.INVITES_STANDARD_REALM_DAILY_MAX
-        realm.message_visibility_limit = None
-        realm.upload_quota_gb = Realm.UPLOAD_QUOTA_STANDARD
-    elif plan_type == Realm.PLAN_TYPE_STANDARD:
-        realm.max_invites = Realm.INVITES_STANDARD_REALM_DAILY_MAX
-        realm.message_visibility_limit = None
-        realm.upload_quota_gb = Realm.UPLOAD_QUOTA_STANDARD
-    elif plan_type == Realm.PLAN_TYPE_SELF_HOSTED:
-        realm.max_invites = None  # type: ignore[assignment] # Apparent mypy bug with Optional[int] setter.
-        realm.message_visibility_limit = None
-        realm.upload_quota_gb = None
-    elif plan_type == Realm.PLAN_TYPE_STANDARD_FREE:
-        realm.max_invites = Realm.INVITES_STANDARD_REALM_DAILY_MAX
-        realm.message_visibility_limit = None
-        realm.upload_quota_gb = Realm.UPLOAD_QUOTA_STANDARD
-    elif plan_type == Realm.PLAN_TYPE_LIMITED:
-        realm.max_invites = settings.INVITES_DEFAULT_REALM_DAILY_MAX
-        realm.message_visibility_limit = Realm.MESSAGE_VISIBILITY_LIMITED
-        realm.upload_quota_gb = Realm.UPLOAD_QUOTA_LIMITED
-    else:
-        raise AssertionError("Invalid plan type")
-
-    update_first_visible_message_id(realm)
-
-    realm.save(update_fields=["_max_invites", "message_visibility_limit", "upload_quota_gb"])
-
-    event = {
-        "type": "realm",
-        "op": "update",
-        "property": "plan_type",
-        "value": plan_type,
-        "extra_data": {"upload_quota": realm.upload_quota_bytes()},
-    }
-    transaction.on_commit(lambda: send_event(realm, event, active_user_ids(realm.id)))
-
-
 def set_realm_permissions_based_on_org_type(realm: Realm) -> None:
     """This function implements overrides for the default configuration
     for new organizations when the administrator selected specific
@@ -779,26 +349,6 @@ def do_remove_realm_domain(
     transaction.on_commit(lambda: send_event(realm, event, active_user_ids(realm.id)))
 
 
-def do_send_realm_reactivation_email(realm: Realm, *, acting_user: Optional[UserProfile]) -> None:
-    url = create_confirmation_link(realm, Confirmation.REALM_REACTIVATION)
-    RealmAuditLog.objects.create(
-        realm=realm,
-        acting_user=acting_user,
-        event_type=RealmAuditLog.REALM_REACTIVATION_EMAIL_SENT,
-        event_time=timezone_now(),
-    )
-    context = {"confirmation_url": url, "realm_uri": realm.uri, "realm_name": realm.name}
-    language = realm.default_language
-    send_email_to_admins(
-        "zerver/emails/realm_reactivation",
-        realm,
-        from_address=FromAddress.tokenized_no_reply_address(),
-        from_name=FromAddress.security_email_from_name(language=language),
-        language=language,
-        context=context,
-    )
-
-
 def get_topic_messages(user_profile: UserProfile, stream: Stream, topic_name: str) -> List[Message]:
     query = UserMessage.objects.filter(
         user_profile=user_profile,
diff --git a/zerver/lib/import_realm.py b/zerver/lib/import_realm.py
index fd8714d30e..d87dc27ad7 100644
--- a/zerver/lib/import_realm.py
+++ b/zerver/lib/import_realm.py
@@ -16,8 +16,8 @@ from psycopg2.extras import execute_values
 from psycopg2.sql import SQL, Identifier
 
 from analytics.models import RealmCount, StreamCount, UserCount
+from zerver.actions.realm_settings import do_change_realm_plan_type
 from zerver.actions.user_settings import do_change_avatar_fields
-from zerver.lib.actions import do_change_realm_plan_type
 from zerver.lib.avatar_hash import user_avatar_path_from_ids
 from zerver.lib.bulk_create import bulk_create_users, bulk_set_users_or_streams_recipient_fields
 from zerver.lib.export import DATE_FIELDS, Field, Path, Record, TableData, TableName
diff --git a/zerver/lib/test_classes.py b/zerver/lib/test_classes.py
index 2a65ec143f..c67cf854dc 100644
--- a/zerver/lib/test_classes.py
+++ b/zerver/lib/test_classes.py
@@ -48,9 +48,9 @@ from two_factor.models import PhoneDevice
 
 from corporate.models import Customer, CustomerPlan, LicenseLedger
 from zerver.actions.message_send import check_send_message, check_send_stream_message
+from zerver.actions.realm_settings import do_set_realm_property
 from zerver.actions.streams import bulk_add_subscriptions, bulk_remove_subscriptions
 from zerver.decorator import do_two_factor_login
-from zerver.lib.actions import do_set_realm_property
 from zerver.lib.cache import bounce_key_prefix_for_testing
 from zerver.lib.initial_password import initial_password
 from zerver.lib.notification_data import UserMessageNotificationsData
diff --git a/zerver/lib/test_helpers.py b/zerver/lib/test_helpers.py
index 4ce95571af..4aaa66c624 100644
--- a/zerver/lib/test_helpers.py
+++ b/zerver/lib/test_helpers.py
@@ -39,8 +39,8 @@ from moto import mock_s3
 from mypy_boto3_s3.service_resource import Bucket
 
 import zerver.lib.upload
+from zerver.actions.realm_settings import do_set_realm_property
 from zerver.lib import cache
-from zerver.lib.actions import do_set_realm_property
 from zerver.lib.avatar import avatar_url
 from zerver.lib.cache import get_cache_backend
 from zerver.lib.db import Params, ParamsT, Query, TimeTrackingCursor
diff --git a/zerver/management/commands/deactivate_realm.py b/zerver/management/commands/deactivate_realm.py
index ce50856f59..0526d5f9ba 100644
--- a/zerver/management/commands/deactivate_realm.py
+++ b/zerver/management/commands/deactivate_realm.py
@@ -1,7 +1,7 @@
 from argparse import ArgumentParser
 from typing import Any
 
-from zerver.lib.actions import do_add_deactivated_redirect, do_deactivate_realm
+from zerver.actions.realm_settings import do_add_deactivated_redirect, do_deactivate_realm
 from zerver.lib.management import ZulipBaseCommand
 
 
diff --git a/zerver/management/commands/export.py b/zerver/management/commands/export.py
index 4f12c9444e..4811a7a72b 100644
--- a/zerver/management/commands/export.py
+++ b/zerver/management/commands/export.py
@@ -6,7 +6,7 @@ from typing import Any
 from django.conf import settings
 from django.core.management.base import CommandError
 
-from zerver.lib.actions import do_deactivate_realm
+from zerver.actions.realm_settings import do_deactivate_realm
 from zerver.lib.export import export_realm_wrapper
 from zerver.lib.management import ZulipBaseCommand
 from zerver.models import Message, Reaction, UserProfile
diff --git a/zerver/management/commands/reactivate_realm.py b/zerver/management/commands/reactivate_realm.py
index c8e1144323..b1650bcb2b 100644
--- a/zerver/management/commands/reactivate_realm.py
+++ b/zerver/management/commands/reactivate_realm.py
@@ -1,7 +1,7 @@
 from argparse import ArgumentParser
 from typing import Any
 
-from zerver.lib.actions import do_reactivate_realm
+from zerver.actions.realm_settings import do_reactivate_realm
 from zerver.lib.management import ZulipBaseCommand
 
 
diff --git a/zerver/management/commands/scrub_realm.py b/zerver/management/commands/scrub_realm.py
index c5a56ce051..5e7b130f70 100644
--- a/zerver/management/commands/scrub_realm.py
+++ b/zerver/management/commands/scrub_realm.py
@@ -1,7 +1,7 @@
 from argparse import ArgumentParser
 from typing import Any
 
-from zerver.lib.actions import do_scrub_realm
+from zerver.actions.realm_settings import do_scrub_realm
 from zerver.lib.management import ZulipBaseCommand
 
 
diff --git a/zerver/management/commands/send_realm_reactivation_email.py b/zerver/management/commands/send_realm_reactivation_email.py
index 6477785377..6ab31e67f1 100644
--- a/zerver/management/commands/send_realm_reactivation_email.py
+++ b/zerver/management/commands/send_realm_reactivation_email.py
@@ -3,7 +3,7 @@ from typing import Any
 
 from django.core.management.base import CommandError
 
-from zerver.lib.actions import do_send_realm_reactivation_email
+from zerver.actions.realm_settings import do_send_realm_reactivation_email
 from zerver.lib.management import ZulipBaseCommand
 
 
diff --git a/zerver/tests/test_audit_log.py b/zerver/tests/test_audit_log.py
index a77a8f6f0e..e8cd6bf076 100644
--- a/zerver/tests/test_audit_log.py
+++ b/zerver/tests/test_audit_log.py
@@ -19,6 +19,14 @@ from zerver.actions.create_user import (
 )
 from zerver.actions.realm_icon import do_change_icon_source
 from zerver.actions.realm_playgrounds import do_add_realm_playground, do_remove_realm_playground
+from zerver.actions.realm_settings import (
+    do_deactivate_realm,
+    do_reactivate_realm,
+    do_set_realm_authentication_methods,
+    do_set_realm_message_editing,
+    do_set_realm_notifications_stream,
+    do_set_realm_signup_notifications_stream,
+)
 from zerver.actions.streams import (
     bulk_add_subscriptions,
     bulk_remove_subscriptions,
@@ -35,17 +43,7 @@ from zerver.actions.user_settings import (
     do_regenerate_api_key,
 )
 from zerver.actions.users import do_change_user_role, do_deactivate_user
-from zerver.lib.actions import (
-    do_add_realm_domain,
-    do_change_realm_domain,
-    do_deactivate_realm,
-    do_reactivate_realm,
-    do_remove_realm_domain,
-    do_set_realm_authentication_methods,
-    do_set_realm_message_editing,
-    do_set_realm_notifications_stream,
-    do_set_realm_signup_notifications_stream,
-)
+from zerver.lib.actions import do_add_realm_domain, do_change_realm_domain, do_remove_realm_domain
 from zerver.lib.message import get_last_message_id
 from zerver.lib.stream_traffic import get_streams_traffic
 from zerver.lib.streams import create_stream_if_needed
diff --git a/zerver/tests/test_auth_backends.py b/zerver/tests/test_auth_backends.py
index c4a656a6af..5b2b530fed 100644
--- a/zerver/tests/test_auth_backends.py
+++ b/zerver/tests/test_auth_backends.py
@@ -42,13 +42,13 @@ from social_django.strategy import DjangoStrategy
 from confirmation.models import Confirmation, create_confirmation_link
 from zerver.actions.create_user import do_create_user, do_reactivate_user
 from zerver.actions.invites import do_invite_users
-from zerver.actions.users import change_user_is_active, do_deactivate_user
-from zerver.lib.actions import (
-    do_create_realm,
+from zerver.actions.realm_settings import (
     do_deactivate_realm,
     do_reactivate_realm,
     do_set_realm_property,
 )
+from zerver.actions.users import change_user_is_active, do_deactivate_user
+from zerver.lib.actions import do_create_realm
 from zerver.lib.avatar import avatar_url
 from zerver.lib.avatar_hash import user_avatar_path
 from zerver.lib.dev_ldap_directory import generate_dev_ldap_dir
diff --git a/zerver/tests/test_bots.py b/zerver/tests/test_bots.py
index c03d0214b9..b8d53b998d 100644
--- a/zerver/tests/test_bots.py
+++ b/zerver/tests/test_bots.py
@@ -8,9 +8,9 @@ from django.core import mail
 from django.test import override_settings
 from zulip_bots.custom_exceptions import ConfigValidationError
 
+from zerver.actions.realm_settings import do_set_realm_property
 from zerver.actions.streams import do_change_stream_permission
 from zerver.actions.users import do_change_can_create_users, do_deactivate_user
-from zerver.lib.actions import do_set_realm_property
 from zerver.lib.bot_config import ConfigError, get_bot_config
 from zerver.lib.bot_lib import get_bot_handler
 from zerver.lib.integrations import EMBEDDED_BOTS, WebhookIntegration
diff --git a/zerver/tests/test_decorators.py b/zerver/tests/test_decorators.py
index 8e4bb7320d..3e10775c14 100644
--- a/zerver/tests/test_decorators.py
+++ b/zerver/tests/test_decorators.py
@@ -14,6 +14,11 @@ from django.http import HttpRequest, HttpResponse
 from django.utils.timezone import now as timezone_now
 
 from zerver.actions.create_user import do_reactivate_user
+from zerver.actions.realm_settings import (
+    do_deactivate_realm,
+    do_reactivate_realm,
+    do_set_realm_property,
+)
 from zerver.actions.users import change_user_is_active, do_deactivate_user
 from zerver.decorator import (
     authenticate_notify,
@@ -30,12 +35,7 @@ from zerver.decorator import (
     zulip_login_required,
 )
 from zerver.forms import OurAuthenticationForm
-from zerver.lib.actions import (
-    do_create_realm,
-    do_deactivate_realm,
-    do_reactivate_realm,
-    do_set_realm_property,
-)
+from zerver.lib.actions import do_create_realm
 from zerver.lib.cache import dict_to_items_tuple, ignore_unhashable_lru_cache, items_tuple_to_dict
 from zerver.lib.exceptions import (
     AccessDeniedError,
diff --git a/zerver/tests/test_email_change.py b/zerver/tests/test_email_change.py
index 2e842f6a90..142ec3350b 100644
--- a/zerver/tests/test_email_change.py
+++ b/zerver/tests/test_email_change.py
@@ -11,9 +11,9 @@ from confirmation.models import (
     create_confirmation_link,
     generate_key,
 )
+from zerver.actions.realm_settings import do_deactivate_realm, do_set_realm_property
 from zerver.actions.user_settings import do_start_email_change_process
 from zerver.actions.users import do_deactivate_user
-from zerver.lib.actions import do_deactivate_realm, do_set_realm_property
 from zerver.lib.test_classes import ZulipTestCase
 from zerver.models import (
     EmailChangeStatus,
diff --git a/zerver/tests/test_email_mirror.py b/zerver/tests/test_email_mirror.py
index 00512f9ac9..759a725b98 100644
--- a/zerver/tests/test_email_mirror.py
+++ b/zerver/tests/test_email_mirror.py
@@ -11,9 +11,9 @@ import orjson
 from django.conf import settings
 from django.http import HttpResponse
 
+from zerver.actions.realm_settings import do_deactivate_realm
 from zerver.actions.streams import do_change_stream_post_policy
 from zerver.actions.users import do_deactivate_user
-from zerver.lib.actions import do_deactivate_realm
 from zerver.lib.email_mirror import (
     create_missed_message_address,
     filter_footer,
diff --git a/zerver/tests/test_event_system.py b/zerver/tests/test_event_system.py
index 8769060cf3..433caa2f0a 100644
--- a/zerver/tests/test_event_system.py
+++ b/zerver/tests/test_event_system.py
@@ -10,8 +10,8 @@ from django.utils.timezone import now as timezone_now
 from version import API_FEATURE_LEVEL, ZULIP_MERGE_BASE, ZULIP_VERSION
 from zerver.actions.message_send import check_send_message
 from zerver.actions.presence import do_update_user_presence
+from zerver.actions.realm_settings import do_set_realm_property
 from zerver.actions.users import do_change_user_role
-from zerver.lib.actions import do_set_realm_property
 from zerver.lib.event_schema import check_restart_event
 from zerver.lib.events import fetch_initial_state_data
 from zerver.lib.exceptions import AccessDeniedError
diff --git a/zerver/tests/test_events.py b/zerver/tests/test_events.py
index d2221cdb2e..0cc6c52664 100644
--- a/zerver/tests/test_events.py
+++ b/zerver/tests/test_events.py
@@ -63,6 +63,16 @@ from zerver.actions.realm_linkifiers import (
 )
 from zerver.actions.realm_logo import do_change_logo_source
 from zerver.actions.realm_playgrounds import do_add_realm_playground, do_remove_realm_playground
+from zerver.actions.realm_settings import (
+    do_change_realm_plan_type,
+    do_deactivate_realm,
+    do_set_realm_authentication_methods,
+    do_set_realm_message_editing,
+    do_set_realm_notifications_stream,
+    do_set_realm_property,
+    do_set_realm_signup_notifications_stream,
+    do_set_realm_user_default_setting,
+)
 from zerver.actions.streams import (
     bulk_add_subscriptions,
     bulk_remove_subscriptions,
@@ -99,19 +109,7 @@ from zerver.actions.users import (
     do_update_outgoing_webhook_service,
 )
 from zerver.actions.video_calls import do_set_zoom_token
-from zerver.lib.actions import (
-    do_add_realm_domain,
-    do_change_realm_domain,
-    do_change_realm_plan_type,
-    do_deactivate_realm,
-    do_remove_realm_domain,
-    do_set_realm_authentication_methods,
-    do_set_realm_message_editing,
-    do_set_realm_notifications_stream,
-    do_set_realm_property,
-    do_set_realm_signup_notifications_stream,
-    do_set_realm_user_default_setting,
-)
+from zerver.lib.actions import do_add_realm_domain, do_change_realm_domain, do_remove_realm_domain
 from zerver.lib.drafts import do_create_drafts, do_delete_draft, do_edit_draft
 from zerver.lib.event_schema import (
     check_alert_words,
diff --git a/zerver/tests/test_home.py b/zerver/tests/test_home.py
index 7696d491a1..5808171f0e 100644
--- a/zerver/tests/test_home.py
+++ b/zerver/tests/test_home.py
@@ -14,8 +14,8 @@ from django.utils.timezone import now as timezone_now
 
 from corporate.models import Customer, CustomerPlan
 from zerver.actions.create_user import do_create_user
+from zerver.actions.realm_settings import do_change_realm_plan_type
 from zerver.actions.users import change_user_is_active
-from zerver.lib.actions import do_change_realm_plan_type
 from zerver.lib.compatibility import LAST_SERVER_UPGRADE_TIME, is_outdated_server
 from zerver.lib.home import (
     get_billing_info,
diff --git a/zerver/tests/test_import_export.py b/zerver/tests/test_import_export.py
index 6c2ec56045..206686d601 100644
--- a/zerver/tests/test_import_export.py
+++ b/zerver/tests/test_import_export.py
@@ -22,11 +22,11 @@ from zerver.actions.reactions import check_add_reaction, do_add_reaction
 from zerver.actions.realm_emoji import check_add_realm_emoji
 from zerver.actions.realm_icon import do_change_icon_source
 from zerver.actions.realm_logo import do_change_logo_source
+from zerver.actions.realm_settings import do_change_realm_plan_type
 from zerver.actions.user_activity import do_update_user_activity, do_update_user_activity_interval
 from zerver.actions.user_topics import do_mute_topic
 from zerver.actions.users import do_deactivate_user
 from zerver.lib import upload
-from zerver.lib.actions import do_change_realm_plan_type
 from zerver.lib.avatar_hash import user_avatar_path
 from zerver.lib.bot_config import set_bot_config
 from zerver.lib.bot_lib import StateHandler
diff --git a/zerver/tests/test_markdown.py b/zerver/tests/test_markdown.py
index 97de45ee67..1e0332f9a5 100644
--- a/zerver/tests/test_markdown.py
+++ b/zerver/tests/test_markdown.py
@@ -12,9 +12,10 @@ from markdown import Markdown
 
 from zerver.actions.alert_words import do_add_alert_words
 from zerver.actions.realm_emoji import do_remove_realm_emoji
+from zerver.actions.realm_settings import do_set_realm_property
 from zerver.actions.user_settings import do_change_user_setting
 from zerver.actions.users import change_user_is_active
-from zerver.lib.actions import do_create_realm, do_set_realm_property
+from zerver.lib.actions import do_create_realm
 from zerver.lib.alert_words import get_alert_word_automaton
 from zerver.lib.camo import get_camo_url
 from zerver.lib.create_user import create_user
diff --git a/zerver/tests/test_message_edit.py b/zerver/tests/test_message_edit.py
index 9a785ff345..7d2f27eb2a 100644
--- a/zerver/tests/test_message_edit.py
+++ b/zerver/tests/test_message_edit.py
@@ -15,9 +15,10 @@ from zerver.actions.message_edit import (
     get_user_info_for_message_updates,
 )
 from zerver.actions.reactions import do_add_reaction
+from zerver.actions.realm_settings import do_change_realm_plan_type, do_set_realm_property
 from zerver.actions.streams import do_change_stream_post_policy, do_deactivate_stream
 from zerver.actions.users import do_change_user_role
-from zerver.lib.actions import do_change_realm_plan_type, do_set_realm_property, get_topic_messages
+from zerver.lib.actions import get_topic_messages
 from zerver.lib.message import MessageDict, has_message_access, messages_for_ids
 from zerver.lib.test_classes import ZulipTestCase
 from zerver.lib.test_helpers import cache_tries_captured, queries_captured
diff --git a/zerver/tests/test_message_fetch.py b/zerver/tests/test_message_fetch.py
index 750a285618..69da0db873 100644
--- a/zerver/tests/test_message_fetch.py
+++ b/zerver/tests/test_message_fetch.py
@@ -14,9 +14,9 @@ from sqlalchemy.types import Integer
 from analytics.lib.counts import COUNT_STATS
 from analytics.models import RealmCount
 from zerver.actions.message_edit import do_update_message
+from zerver.actions.realm_settings import do_set_realm_property
 from zerver.actions.uploads import do_claim_attachments
 from zerver.actions.users import do_deactivate_user
-from zerver.lib.actions import do_set_realm_property
 from zerver.lib.avatar import avatar_url
 from zerver.lib.exceptions import JsonableError
 from zerver.lib.mention import MentionBackend, MentionData
diff --git a/zerver/tests/test_message_send.py b/zerver/tests/test_message_send.py
index b63d934595..32c1ba5f35 100644
--- a/zerver/tests/test_message_send.py
+++ b/zerver/tests/test_message_send.py
@@ -26,9 +26,10 @@ from zerver.actions.message_send import (
     internal_send_stream_message_by_name,
     send_rate_limited_pm_notification_to_bot_owner,
 )
+from zerver.actions.realm_settings import do_set_realm_property
 from zerver.actions.streams import do_change_stream_post_policy
 from zerver.actions.users import do_change_can_forge_sender, do_deactivate_user
-from zerver.lib.actions import do_add_realm_domain, do_create_realm, do_set_realm_property
+from zerver.lib.actions import do_add_realm_domain, do_create_realm
 from zerver.lib.addressee import Addressee
 from zerver.lib.cache import cache_delete, get_stream_cache_key
 from zerver.lib.exceptions import JsonableError
diff --git a/zerver/tests/test_realm.py b/zerver/tests/test_realm.py
index ec47ad78ad..1d4e75c1aa 100644
--- a/zerver/tests/test_realm.py
+++ b/zerver/tests/test_realm.py
@@ -9,19 +9,18 @@ from django.conf import settings
 from django.utils.timezone import now as timezone_now
 
 from confirmation.models import Confirmation, create_confirmation_link
-from zerver.actions.streams import do_deactivate_stream
-from zerver.lib.actions import (
+from zerver.actions.realm_settings import (
     do_add_deactivated_redirect,
     do_change_realm_org_type,
     do_change_realm_plan_type,
-    do_change_realm_subdomain,
-    do_create_realm,
     do_deactivate_realm,
     do_scrub_realm,
     do_send_realm_reactivation_email,
     do_set_realm_property,
     do_set_realm_user_default_setting,
 )
+from zerver.actions.streams import do_deactivate_stream
+from zerver.lib.actions import do_change_realm_subdomain, do_create_realm
 from zerver.lib.realm_description import get_realm_rendered_description, get_realm_text_description
 from zerver.lib.send_email import send_future_email
 from zerver.lib.streams import create_stream_if_needed
diff --git a/zerver/tests/test_realm_domains.py b/zerver/tests/test_realm_domains.py
index cd932937d4..791aeca805 100644
--- a/zerver/tests/test_realm_domains.py
+++ b/zerver/tests/test_realm_domains.py
@@ -2,13 +2,9 @@ import orjson
 from django.core.exceptions import ValidationError
 from django.db.utils import IntegrityError
 
+from zerver.actions.realm_settings import do_set_realm_property
 from zerver.actions.users import do_change_user_role
-from zerver.lib.actions import (
-    do_change_realm_domain,
-    do_create_realm,
-    do_remove_realm_domain,
-    do_set_realm_property,
-)
+from zerver.lib.actions import do_change_realm_domain, do_create_realm, do_remove_realm_domain
 from zerver.lib.domains import validate_domain
 from zerver.lib.email_validation import email_allowed_for_realm
 from zerver.lib.test_classes import ZulipTestCase
diff --git a/zerver/tests/test_realm_emoji.py b/zerver/tests/test_realm_emoji.py
index cb6a07a75b..c5f5308d81 100644
--- a/zerver/tests/test_realm_emoji.py
+++ b/zerver/tests/test_realm_emoji.py
@@ -2,8 +2,9 @@ from unittest import mock
 
 from zerver.actions.create_user import do_create_user
 from zerver.actions.realm_emoji import check_add_realm_emoji
+from zerver.actions.realm_settings import do_set_realm_property
 from zerver.actions.users import do_change_user_role
-from zerver.lib.actions import do_create_realm, do_set_realm_property
+from zerver.lib.actions import do_create_realm
 from zerver.lib.exceptions import JsonableError
 from zerver.lib.test_classes import ZulipTestCase
 from zerver.lib.test_helpers import get_test_image_file
diff --git a/zerver/tests/test_retention.py b/zerver/tests/test_retention.py
index 5f6abf49cd..bc3d7200e9 100644
--- a/zerver/tests/test_retention.py
+++ b/zerver/tests/test_retention.py
@@ -7,8 +7,9 @@ from django.utils.timezone import now as timezone_now
 
 from zerver.actions.message_edit import do_delete_messages
 from zerver.actions.message_send import internal_send_private_message
+from zerver.actions.realm_settings import do_set_realm_property
 from zerver.actions.submessage import do_add_submessage
-from zerver.lib.actions import do_create_realm, do_set_realm_property
+from zerver.lib.actions import do_create_realm
 from zerver.lib.retention import (
     archive_messages,
     clean_archived_data,
diff --git a/zerver/tests/test_signup.py b/zerver/tests/test_signup.py
index b76eb9322e..ee0632941d 100644
--- a/zerver/tests/test_signup.py
+++ b/zerver/tests/test_signup.py
@@ -36,18 +36,17 @@ from zerver.actions.invites import (
     do_get_invites_controlled_by_user,
     do_invite_users,
 )
+from zerver.actions.realm_settings import (
+    do_deactivate_realm,
+    do_set_realm_property,
+    do_set_realm_user_default_setting,
+)
 from zerver.actions.user_settings import do_change_full_name
 from zerver.actions.users import change_user_is_active, do_change_user_role, do_deactivate_user
 from zerver.context_processors import common_context
 from zerver.decorator import do_two_factor_login
 from zerver.forms import HomepageForm, check_subdomain_available
-from zerver.lib.actions import (
-    do_change_realm_subdomain,
-    do_create_realm,
-    do_deactivate_realm,
-    do_set_realm_property,
-    do_set_realm_user_default_setting,
-)
+from zerver.lib.actions import do_change_realm_subdomain, do_create_realm
 from zerver.lib.email_notifications import enqueue_welcome_emails, followup_day2_email_delay
 from zerver.lib.initial_password import initial_password
 from zerver.lib.mobile_auth_otp import (
diff --git a/zerver/tests/test_subs.py b/zerver/tests/test_subs.py
index d3dd4c4a5e..ced52aecf5 100644
--- a/zerver/tests/test_subs.py
+++ b/zerver/tests/test_subs.py
@@ -23,6 +23,7 @@ from zerver.actions.default_streams import (
     get_default_streams_for_realm,
     lookup_default_stream_groups,
 )
+from zerver.actions.realm_settings import do_change_realm_plan_type, do_set_realm_property
 from zerver.actions.streams import (
     bulk_add_subscriptions,
     bulk_remove_subscriptions,
@@ -31,12 +32,7 @@ from zerver.actions.streams import (
     do_deactivate_stream,
 )
 from zerver.actions.users import do_change_user_role, do_deactivate_user
-from zerver.lib.actions import (
-    do_change_realm_plan_type,
-    do_create_realm,
-    do_set_realm_property,
-    get_topic_messages,
-)
+from zerver.lib.actions import do_create_realm, get_topic_messages
 from zerver.lib.exceptions import JsonableError
 from zerver.lib.message import UnreadStreamInfo, aggregate_unread_data, get_raw_unread_data
 from zerver.lib.response import json_success
diff --git a/zerver/tests/test_upload.py b/zerver/tests/test_upload.py
index a769f1c695..dea2ba5624 100644
--- a/zerver/tests/test_upload.py
+++ b/zerver/tests/test_upload.py
@@ -22,9 +22,10 @@ import zerver.lib.upload
 from zerver.actions.message_send import internal_send_private_message
 from zerver.actions.realm_icon import do_change_icon_source
 from zerver.actions.realm_logo import do_change_logo_source
+from zerver.actions.realm_settings import do_change_realm_plan_type, do_set_realm_property
 from zerver.actions.uploads import do_delete_old_unclaimed_attachments
 from zerver.actions.user_settings import do_delete_avatar_image
-from zerver.lib.actions import do_change_realm_plan_type, do_create_realm, do_set_realm_property
+from zerver.lib.actions import do_create_realm
 from zerver.lib.avatar import avatar_url, get_avatar_field
 from zerver.lib.avatar_hash import user_avatar_path
 from zerver.lib.cache import cache_get, get_realm_used_upload_space_cache_key
diff --git a/zerver/tests/test_user_groups.py b/zerver/tests/test_user_groups.py
index 3725be0f8e..db277b4a59 100644
--- a/zerver/tests/test_user_groups.py
+++ b/zerver/tests/test_user_groups.py
@@ -5,8 +5,8 @@ from unittest import mock
 import orjson
 from django.utils.timezone import now as timezone_now
 
+from zerver.actions.realm_settings import do_set_realm_property
 from zerver.actions.user_groups import promote_new_full_members
-from zerver.lib.actions import do_set_realm_property
 from zerver.lib.streams import ensure_stream
 from zerver.lib.test_classes import ZulipTestCase
 from zerver.lib.test_helpers import most_recent_usermessage
diff --git a/zerver/tests/test_users.py b/zerver/tests/test_users.py
index dccda72d6c..52ca5b0b39 100644
--- a/zerver/tests/test_users.py
+++ b/zerver/tests/test_users.py
@@ -16,6 +16,7 @@ from zerver.actions.create_user import do_create_user, do_reactivate_user
 from zerver.actions.invites import do_create_multiuse_invite_link, do_invite_users
 from zerver.actions.message_send import get_recipient_info
 from zerver.actions.muted_users import do_mute_user
+from zerver.actions.realm_settings import do_set_realm_property
 from zerver.actions.users import (
     change_user_is_active,
     do_change_can_create_users,
@@ -23,7 +24,6 @@ from zerver.actions.users import (
     do_deactivate_user,
     do_delete_user,
 )
-from zerver.lib.actions import do_set_realm_property
 from zerver.lib.avatar import avatar_url, get_gravatar_url
 from zerver.lib.bulk_create import create_users
 from zerver.lib.create_user import copy_default_settings
diff --git a/zerver/views/development/email_log.py b/zerver/views/development/email_log.py
index 286fd10bfd..013ba74dde 100755
--- a/zerver/views/development/email_log.py
+++ b/zerver/views/development/email_log.py
@@ -9,9 +9,9 @@ from django.shortcuts import redirect, render
 from django.views.decorators.http import require_safe
 
 from confirmation.models import Confirmation, confirmation_url
+from zerver.actions.realm_settings import do_send_realm_reactivation_email
 from zerver.actions.user_settings import do_change_user_delivery_email
 from zerver.actions.users import change_user_is_active
-from zerver.lib.actions import do_send_realm_reactivation_email
 from zerver.lib.email_notifications import enqueue_welcome_emails
 from zerver.lib.response import json_success
 from zerver.models import Realm, get_realm, get_realm_stream, get_user_by_delivery_email
diff --git a/zerver/views/realm.py b/zerver/views/realm.py
index 322bdec9ea..177606e449 100644
--- a/zerver/views/realm.py
+++ b/zerver/views/realm.py
@@ -7,10 +7,7 @@ from django.utils.translation import gettext as _
 from django.views.decorators.http import require_safe
 
 from confirmation.models import Confirmation, ConfirmationKeyException, get_object_from_key
-from zerver.decorator import require_realm_admin, require_realm_owner
-from zerver.forms import check_subdomain_available as check_subdomain
-from zerver.lib.actions import (
-    do_change_realm_subdomain,
+from zerver.actions.realm_settings import (
     do_deactivate_realm,
     do_reactivate_realm,
     do_set_realm_authentication_methods,
@@ -20,6 +17,9 @@ from zerver.lib.actions import (
     do_set_realm_signup_notifications_stream,
     do_set_realm_user_default_setting,
 )
+from zerver.decorator import require_realm_admin, require_realm_owner
+from zerver.forms import check_subdomain_available as check_subdomain
+from zerver.lib.actions import do_change_realm_subdomain
 from zerver.lib.exceptions import JsonableError, OrganizationOwnerRequired
 from zerver.lib.i18n import get_available_language_codes
 from zerver.lib.message import parse_message_content_delete_limit