diff --git a/synapse/replication/slave/storage/_base.py b/synapse/replication/slave/storage/_base.py
deleted file mode 100644
index 7644146dba..0000000000
--- a/synapse/replication/slave/storage/_base.py
+++ /dev/null
@@ -1,58 +0,0 @@
-# Copyright 2016 OpenMarket Ltd
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-# http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-
-import logging
-from typing import TYPE_CHECKING, Optional
-
-from synapse.storage.database import DatabasePool, LoggingDatabaseConnection
-from synapse.storage.databases.main.cache import CacheInvalidationWorkerStore
-from synapse.storage.engines import PostgresEngine
-from synapse.storage.util.id_generators import MultiWriterIdGenerator
-
-if TYPE_CHECKING:
- from synapse.server import HomeServer
-
-logger = logging.getLogger(__name__)
-
-
-class BaseSlavedStore(CacheInvalidationWorkerStore):
- def __init__(
- self,
- database: DatabasePool,
- db_conn: LoggingDatabaseConnection,
- hs: "HomeServer",
- ):
- super().__init__(database, db_conn, hs)
- if isinstance(self.database_engine, PostgresEngine):
- self._cache_id_gen: Optional[
- MultiWriterIdGenerator
- ] = MultiWriterIdGenerator(
- db_conn,
- database,
- stream_name="caches",
- instance_name=hs.get_instance_name(),
- tables=[
- (
- "cache_invalidation_stream_by_instance",
- "instance_name",
- "stream_id",
- )
- ],
- sequence_name="cache_invalidation_stream_seq",
- writers=[],
- )
- else:
- self._cache_id_gen = None
-
- self.hs = hs
diff --git a/synapse/replication/slave/storage/account_data.py b/synapse/replication/slave/storage/account_data.py
index ee74ee7d85..57d3237981 100644
--- a/synapse/replication/slave/storage/account_data.py
+++ b/synapse/replication/slave/storage/account_data.py
@@ -13,10 +13,9 @@
# See the License for the specific language governing permissions and
# limitations under the License.
-from synapse.replication.slave.storage._base import BaseSlavedStore
from synapse.storage.databases.main.account_data import AccountDataWorkerStore
from synapse.storage.databases.main.tags import TagsWorkerStore
-class SlavedAccountDataStore(TagsWorkerStore, AccountDataWorkerStore, BaseSlavedStore):
+class SlavedAccountDataStore(TagsWorkerStore, AccountDataWorkerStore):
pass
diff --git a/synapse/replication/slave/storage/deviceinbox.py b/synapse/replication/slave/storage/deviceinbox.py
index e940751084..df9e4d8f45 100644
--- a/synapse/replication/slave/storage/deviceinbox.py
+++ b/synapse/replication/slave/storage/deviceinbox.py
@@ -12,9 +12,8 @@
# See the License for the specific language governing permissions and
# limitations under the License.
-from synapse.replication.slave.storage._base import BaseSlavedStore
from synapse.storage.databases.main.deviceinbox import DeviceInboxWorkerStore
-class SlavedDeviceInboxStore(DeviceInboxWorkerStore, BaseSlavedStore):
+class SlavedDeviceInboxStore(DeviceInboxWorkerStore):
pass
diff --git a/synapse/replication/slave/storage/devices.py b/synapse/replication/slave/storage/devices.py
index a48cc02069..6fcade510a 100644
--- a/synapse/replication/slave/storage/devices.py
+++ b/synapse/replication/slave/storage/devices.py
@@ -14,7 +14,6 @@
from typing import TYPE_CHECKING, Any, Iterable
-from synapse.replication.slave.storage._base import BaseSlavedStore
from synapse.replication.slave.storage._slaved_id_tracker import SlavedIdTracker
from synapse.replication.tcp.streams._base import DeviceListsStream, UserSignatureStream
from synapse.storage.database import DatabasePool, LoggingDatabaseConnection
@@ -24,7 +23,7 @@ if TYPE_CHECKING:
from synapse.server import HomeServer
-class SlavedDeviceStore(DeviceWorkerStore, BaseSlavedStore):
+class SlavedDeviceStore(DeviceWorkerStore):
def __init__(
self,
database: DatabasePool,
diff --git a/synapse/replication/slave/storage/directory.py b/synapse/replication/slave/storage/directory.py
index 71fde0c96c..ca716df3df 100644
--- a/synapse/replication/slave/storage/directory.py
+++ b/synapse/replication/slave/storage/directory.py
@@ -14,8 +14,6 @@
from synapse.storage.databases.main.directory import DirectoryWorkerStore
-from ._base import BaseSlavedStore
-
-class DirectoryStore(DirectoryWorkerStore, BaseSlavedStore):
+class DirectoryStore(DirectoryWorkerStore):
pass
diff --git a/synapse/replication/slave/storage/events.py b/synapse/replication/slave/storage/events.py
index a72dad7464..fe47778cb1 100644
--- a/synapse/replication/slave/storage/events.py
+++ b/synapse/replication/slave/storage/events.py
@@ -29,8 +29,6 @@ from synapse.storage.databases.main.stream import StreamWorkerStore
from synapse.storage.databases.main.user_erasure_store import UserErasureWorkerStore
from synapse.util.caches.stream_change_cache import StreamChangeCache
-from ._base import BaseSlavedStore
-
if TYPE_CHECKING:
from synapse.server import HomeServer
@@ -56,7 +54,6 @@ class SlavedEventStore(
EventsWorkerStore,
UserErasureWorkerStore,
RelationsWorkerStore,
- BaseSlavedStore,
):
def __init__(
self,
diff --git a/synapse/replication/slave/storage/filtering.py b/synapse/replication/slave/storage/filtering.py
index 4d185e2b56..c52679cd60 100644
--- a/synapse/replication/slave/storage/filtering.py
+++ b/synapse/replication/slave/storage/filtering.py
@@ -14,16 +14,15 @@
from typing import TYPE_CHECKING
+from synapse.storage._base import SQLBaseStore
from synapse.storage.database import DatabasePool, LoggingDatabaseConnection
from synapse.storage.databases.main.filtering import FilteringStore
-from ._base import BaseSlavedStore
-
if TYPE_CHECKING:
from synapse.server import HomeServer
-class SlavedFilteringStore(BaseSlavedStore):
+class SlavedFilteringStore(SQLBaseStore):
def __init__(
self,
database: DatabasePool,
diff --git a/synapse/replication/slave/storage/profile.py b/synapse/replication/slave/storage/profile.py
index 99f4a22642..a774a2ff48 100644
--- a/synapse/replication/slave/storage/profile.py
+++ b/synapse/replication/slave/storage/profile.py
@@ -12,9 +12,8 @@
# See the License for the specific language governing permissions and
# limitations under the License.
-from synapse.replication.slave.storage._base import BaseSlavedStore
from synapse.storage.databases.main.profile import ProfileWorkerStore
-class SlavedProfileStore(ProfileWorkerStore, BaseSlavedStore):
+class SlavedProfileStore(ProfileWorkerStore):
pass
diff --git a/synapse/replication/slave/storage/pushers.py b/synapse/replication/slave/storage/pushers.py
index de642bba71..44ed20e424 100644
--- a/synapse/replication/slave/storage/pushers.py
+++ b/synapse/replication/slave/storage/pushers.py
@@ -18,14 +18,13 @@ from synapse.replication.tcp.streams import PushersStream
from synapse.storage.database import DatabasePool, LoggingDatabaseConnection
from synapse.storage.databases.main.pusher import PusherWorkerStore
-from ._base import BaseSlavedStore
from ._slaved_id_tracker import SlavedIdTracker
if TYPE_CHECKING:
from synapse.server import HomeServer
-class SlavedPusherStore(PusherWorkerStore, BaseSlavedStore):
+class SlavedPusherStore(PusherWorkerStore):
def __init__(
self,
database: DatabasePool,
diff --git a/synapse/replication/slave/storage/receipts.py b/synapse/replication/slave/storage/receipts.py
index 3826b87dec..407862a2b2 100644
--- a/synapse/replication/slave/storage/receipts.py
+++ b/synapse/replication/slave/storage/receipts.py
@@ -15,8 +15,6 @@
from synapse.storage.databases.main.receipts import ReceiptsWorkerStore
-from ._base import BaseSlavedStore
-
-class SlavedReceiptsStore(ReceiptsWorkerStore, BaseSlavedStore):
+class SlavedReceiptsStore(ReceiptsWorkerStore):
pass
diff --git a/synapse/replication/slave/storage/registration.py b/synapse/replication/slave/storage/registration.py
index 5dae35a960..52c593e59d 100644
--- a/synapse/replication/slave/storage/registration.py
+++ b/synapse/replication/slave/storage/registration.py
@@ -14,8 +14,6 @@
from synapse.storage.databases.main.registration import RegistrationWorkerStore
-from ._base import BaseSlavedStore
-
-class SlavedRegistrationStore(RegistrationWorkerStore, BaseSlavedStore):
+class SlavedRegistrationStore(RegistrationWorkerStore):
pass
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